Guides worth reading before you book
How hot water systems fail, what they cost to keep, and how to tell a repair from a replacement.
These are the questions that come up on the phone often enough to be worth answering properly: whether a cylinder is worth repairing at its age, what size you actually need, why London water shortens the life of everything it touches, and what to check before you call anyone out.
They fall into five groups, and each group has one page that carries the argument the rest of it refers back to.
Airlock in Hot Water Pipes? How to Clear It Safely
Hot tap spluttering or barely running while the cold is fine? Usually an airlock on a tank fed system. How to clear it, and when it is something else.
Read thisAlbion Hot Water Cylinders Explained
Albion Water Heaters makes the Ultrasteel unvented cylinder, now under Kingspan. How to identify yours, what fails, and whether parts are still available.
Read thisAnti-Vacuum Valve Leaking? What It Does and How It Is Fixed
A drip from the small valve on top of your hot water cylinder is often the anti-vacuum valve. Why it weeps, why it must not be capped, and the fix.
Read thisAre Directory Reviews Trustworthy?
Directory reviews are usually written by real customers, but the set you see is picked by the trader. How collection works, and how to read one properly.
Read thisAriston Boiler No Hot Water: Causes, Codes and Checks
Ariston combi with no hot water? What codes like 501 and 108 usually mean, the checks to make first, and the parts that fail when the heating still works.
Read thisAriston Hot Water Cylinders Explained
Most London Ariston units are compact electric water heaters, not cylinders. How to identify yours, what fails, parts and hard water. Call 020 4652 5111.
Read thisBaxi Boiler No Hot Water: Causes and What to Check
Baxi combi or system boiler with no hot water? What the E code means, the checks to make first, and the parts that fail when the heating still works.
Read thisBaxi vs Worcester Bosch: Which One Would We Fit?
Our verdict on Baxi vs Worcester Bosch: what actually fails on each, parts availability, servicing access, and which one we would fit in a London home.
Read thisBest Unvented Cylinder Brands: An Engineer's View
An engineer ranks unvented cylinders on serviceability, immersion access, coil design, expansion arrangement and parts, and says what we would fit.
Read thisBiasi Boiler No Hot Water: Causes and What to Check
Biasi Riva, Garda or Parva combi with no hot water? The checks to make first, the parts that fail when the heating still works, and repair or replace.
Read thisBlack Bits in Your Hot Water? What They Are and What to Do
Black specks in hot water are usually perished rubber from a tap hose, or heating sludge getting into the cylinder. Two quick tests tell you which.
Read thisBlocked Plate Heat Exchanger: Symptoms and the Fix
Lukewarm or fluctuating hot water and a weak hot flow on a combi, with the heating fine, often means a scaled plate heat exchanger. Signs, causes, fix.
Read thisBoiler Brands to Avoid and Why: Parts, Boards and Serviceability
The brands worth avoiding are the ones you cannot get parts for. How to judge a boiler on serviceability, board supply and how long it is supported.
Read thisBoiler Not Working After a Power Cut? What to Check
Power back but no heating or hot water? Check the boiler switch, programmer clock, lockout, pressure and thermostat, in that order. What each one means.
Read thisBoiler Pressure Too High or Keeps Rising? Why and How to Fix It
Near 3 bar? Bleed a radiator back to about 1.5 bar, then find why it rose: filling loop, flat expansion vessel, overfilling or a failed cylinder coil.
Read thisBrown Water From the Hot Tap? What It Means for Your Cylinder
Brown water only from the hot tap means rust in the hot system: a corroding cylinder, a rusty loft tank or heating water leaking in through the coil.
Read thisCan a Boiler Explode? The Real Risks and Warning Signs
A modern gas boiler is very unlikely to explode. What stops it, the real risks (gas leaks and carbon monoxide), the warning signs, and what to do now.
Read thisCan a Plumber Fix a Boiler? What They Can and Cannot Touch
A plumber can fix a gas boiler only if Gas Safe registered for boilers. What any plumber can still do, what needs gas registration, and who to call.
Read thisCan an Unvented Cylinder Explode? The Real Risk, Explained
Rarely, because several safety devices stand between normal and dangerous. What each one does, the warning signs of overheating, and what to do now.
Read thisCan You Drink Hot Tap Water? Why the Cold Tap Is the Safe One
Use the cold kitchen tap for drinking and cooking. Why hot tap water is different, which systems make it worse, and what to check in an older London home.
Read thisCan You Withhold Payment From a Plumber?
You can hold back a proportionate amount when plumbing work is defective or unfinished, but not the whole bill. How to do it without weakening your case.
Read thisCarbon Monoxide Alarm Going Off or Beeping: What to Do
A loud alarm means get out and call 0800 111 999. A chirp every minute is usually the battery or end of life. How to tell which it is, and what to do next.
Read thisCheckatrade, Trustatrader and What a Directory Badge Actually Means
What directory vetting checks, what it misses, what a trade pays to be listed, and how much weight a Checkatrade or Trustatrader badge deserves.
Read thisCloudy or Milky Hot Water? When It Is Air and When It Is Not
Milky hot water that clears from the bottom of the glass up is harmless air. White bits, grit or spitting taps are scale or a fault. How to tell which.
Read thisCold Water Tank in the Loft: What It Does and Can It Go?
The loft tank feeds your hot water cylinder and often the bath and toilets. What it supplies, how to look after it in winter, and when it can be taken out.
Read thisCombi Boiler vs System Boiler and Cylinder: Which Is Right for Your Home?
One bathroom and a strong main suits a combi. Two bathrooms, a weak main or a household that showers at once needs a system boiler and cylinder.
Read thisCombination Cylinder: Repair, Replace or Upgrade?
A combination cylinder is a hot tank with its own cold tank on top. When to repair it, replace like for like or upgrade to unvented. Call 020 4652 5111.
Read thisCommon Plumbing Scams And How To Avoid Them
Deposits before diagnosis, extra faults found mid-job, parts never fitted, quotes that grow: how each plumbing scam works and the paperwork that stops it.
Read thisConstant Hot Water: Should Your Hot Water Be On All the Time?
A boiler-heated cylinder on constant costs little more than a timer if it is well insulated. When constant makes sense, and when a timer saves money.
Read thisConverting to a Combi Boiler: Should the Cylinder Go?
What a combi conversion involves: removing the cylinder and loft tanks, gas and flue work, the cost drivers, and when to keep the cylinder. 020 4652 5111.
Read thisCopper Cylinder Scrap Value: What an Old Tank Is Worth
An old copper hot water cylinder is scrapped by weight at the yard's copper cylinder rate. What lowers the price, how to prepare it, and who keeps it.
Read thisCopper vs Plastic Pipes: Which Should You Use at Home?
Copper or plastic plumbing? Where each one belongs, where plastic is not allowed, and what to use for a repair in a London house. Call 020 4652 5111.
Read thisDirect vs Indirect Hot Water Cylinder: Which Do You Need?
A direct cylinder is heated only by electric immersions; an indirect one by a boiler coil. How to tell which you have and which suits your home.
Read thisDiverter Valve Replacement Cost: What You Are Paying For
What decides the cost of a combi diverter valve replacement: motor head or full valve, the boiler, parts and time. When it is worth it. Call 020 4652 5111.
Read thisDo Plumbers Charge for Quotes?
Most plumbers quote defined work free and charge to attend an undiagnosed fault. Why, what a paid visit should leave you holding, and what to ask first.
Read thisDo You Need a Thermostatic Mixing Valve? TMV Rules Explained
When a TMV is required by Building Regulations, TMV2 vs TMV3, where to fit one and why they need servicing in hard water. Call 020 4652 5111.
Read thisAccumulator Tank: Do You Need One for Better Water Flow?
An accumulator fixes poor flow, not low pressure. How to test your mains and when one makes an unvented cylinder or combi work. Call 020 4652 5111.
Read thisDo Washing Machines and Dishwashers Need Hot Water?
Most UK washing machines are cold fill and heat their own water. Dishwashers vary. Which valve to use, when a hot fill makes sense and what to check first.
Read thisDual Immersion Heater: Single or Dual, Which Do You Need?
How a dual immersion heater works, the Bath and Sink switch, why off-peak cylinders need two elements, and when a single one is enough. Call 020 4652 5111.
Read thisElectric Hot Water Cylinders for Homes With No Gas
Direct unvented, vented, Economy 7 and thermal store options for homes with no gas, and how to pick the right one for a London flat. Call 020 4652 5111.
Read thisFrost Stat: What It Does and Whether Your Boiler Needs One
A frost stat turns the heating on when it gets near freezing, whatever the timer says. How it differs from boiler frost protection and when you need one.
Read thisGas Multipoint Water Heater Not Working? What to Check
Pilot keeps going out, burner will not light or water only warm? What goes wrong with gas multipoints like the Ascot, and when to stop using one.
Read thisGledhill BoilerMate Problems: No Hot Water or Lukewarm
BoilerMate giving no hot water, lukewarm water or leaking? First check whether the store is hot. What usually fails, what to check and who can fix it.
Read thisGledhill Cylinders Explained
An engineer explains the Gledhill range, how to tell a StainlessLite cylinder from a Pulsacoil thermal store, what fails on each and how parts stack up.
Read thisGledhill Pulsacoil Explained
A Pulsacoil is a thermal store, not a cylinder. How to identify your generation, what fails on each, and when replacement makes sense. Call 020 4652 5111.
Read thisGledhill StainlessLite Cylinders
StainlessLite, Plus or Pro? How to tell which Gledhill unvented cylinder you have, what actually fails on it, and which spares are still stocked.
Read thisGlow-worm Boiler No Hot Water: Causes and What to Check
No hot water from a Glow-worm Energy, Ultimate or Betacom? What the F code means, the checks to make first, and the parts that usually fail.
Read thisHard Water and Hot Water Cylinders in London: What Scale Actually Does
Why London water shortens cylinder and immersion life, what limescale does to each part, which treatments genuinely work and which are sold as help.
Read thisHeader Tank Overflowing or Full of Hot Water? What It Means
A header tank that overflows or fills with hot water points to a stuck float valve, a leaking cylinder coil or pumping over. How to tell which you have.
Read thisHeat Battery vs Hot Water Cylinder: Which Should You Choose?
How a Sunamp style heat battery compares with an unvented cylinder on space, flow, running cost and repairs, and who each one suits. Call 020 4652 5111.
Read thisHeat Only Boiler: What a Regular or Conventional Boiler Is
A heat only boiler, also called regular or conventional, heats radiators and a cylinder fed from loft tanks. How it works, how to spot one, what fails.
Read thisHeat Pump Cylinders: Do You Need a New Hot Water Tank?
Why a heat pump needs a cylinder with a much bigger coil, when your existing tank can stay, sizing, Legionella cycles and G3 rules. Call 020 4652 5111.
Read thisHeat Pump No Hot Water? What to Check and Who to Call
No hot water from your air source heat pump? The checks to make first, the cylinder faults behind most cases, and which part needs which engineer.
Read thisHeat Pump Water Heater: Is It Worth It in a UK Home?
An all in one heat pump water heater can cut the cost of electric hot water, but it needs the right room. Who it suits, and who not. Call 020 4652 5111.
Read thisHeatrae Sadia Cylinders Explained
Heatrae Sadia makes the Megaflo. How to read the data badge, find the right part for your cylinder, and what fails most often. Engineers on 020 4652 5111.
Read thisHeatrae Sadia Multipoint: Faults, Parts and Repairs
The Heatrae Sadia Multipoint is a small unvented electric water heater. How to identify yours, what fails, what you can check and when to call an engineer.
Read thisHive Hot Water Not Working? How to Find the Real Fault
Hive says hot water is on but the taps run cold? Check the mode, boost and receiver lights, then the cylinder valve and thermostat. What each result means.
Read thisHorizontal and Slimline Hot Water Cylinders: Which Fits?
When a horizontal or slimline hot water cylinder is the right choice, what each gives up against a standard upright one, and how to measure. 020 4652 5111.
Read thisHot Water Cylinder in the Loft: Can It Go Up There?
Moving a hot water cylinder into the loft: weight, joists, the discharge pipe, frost, access for servicing, and when another spot is the better choice.
Read thisHot Water Cylinder Jacket: Do You Need One and What Size?
Does your cylinder need a jacket? How to tell, how to measure for the right size, how to fit one properly, and when the cylinder is the real problem.
Read thisHot Water Only Works When the Heating Is On? Here Is Why
If the cylinder only heats with the heating on, the boiler is not getting the hot water signal. Usually a motorised valve, cylinder stat or wiring fault.
Read thisHot Water Runs Out Quickly? Why Your Cylinder Goes Cold
Hot water going cold after one shower is usually an immersion on the wrong setting, a scaled coil, a failed element or a small cylinder. How to tell.
Read thisHot Water Smells Like Rotten Eggs? Why, and How to Fix It
A rotten egg smell only from the hot tap is bacteria in the cylinder, often a warm tank or a spent anode. How to check, what to do now and when to call us.
Read thisHourly Rate or Fixed Price: Which Is Better for You?
When hourly favours you, when a fixed price does, and how to tell which one you are really being offered. An honest look at how plumbing work is priced.
Read thisHow Does a Pulsacoil Work?
Mains water is heated on its way to the tap by a tank of stored hot water. Why a Pulsacoil runs out in the evening and what the pump and heat exchanger do.
Read thisHow Does a Combi Boiler Work? Heating and Hot Water
A combi heats mains water as it flows, with no tank. How the flow sensor, diverter valve and plate heat exchanger work, and why winter showers run cooler.
Read thisHow Does a Hot Water Cylinder Work? A Plain Guide
A hot water cylinder stores water, heats it with a boiler coil or immersion, and feeds cold in at the bottom as hot leaves the top. The parts, explained.
Read thisHow Long Do Copper Pipes Last? Signs They Need Replacing
Copper water pipe often lasts fifty years or more. What causes pinhole leaks, signs a run is failing, and when to repair or replace. Call 020 4652 5111.
Read thisHow Long Do Immersion Heaters Last? Repair or Replace
Why immersion heaters fail sooner in London water, which part has usually gone, and when a new element is the fix or the cylinder is done. 020 4652 5111.
Read thisHow Long Does a Hot Water Cylinder Last?
Vented copper: 20 to 30 years. Unvented stainless: 15 to 25 if serviced. Enamelled steel: 10 to 15. What shortens that in London water and when to replace.
Read thisHow Long Should a Boiler Last?
How long a boiler really lasts, what wears out first, what shortens it in London, and the point where the next repair stops being sensible.
Read thisHow Long Should a Plumbing Job Take?
Realistic timings for common plumbing jobs so you can sanity check an hourly bill, and the access problems that genuinely make a job run longer.
Read thisHow to Check a Plumber Is Qualified for Unvented Work
Ask to see the unvented hot water certificate, check the number and expiry, match the name to the person doing the work, then read the record afterwards.
Read thisHow to Check a Plumber on the Gas Safe Register
Search the licence number at gassaferegister.co.uk or ring 0800 408 5500. What the ID card shows front and back, and why card and register can disagree.
Read thisHow to Choose a Hot Water Cylinder: What Actually Decides It
Choosing a hot water cylinder: incoming main, vented or unvented, coil recovery, litres, and the airing cupboard constraints that decide it in practice.
Read thisHow to Complain About a Plumber and Get a Refund
Complain to the firm in writing first and ask for the work to be put right or a refund. If they refuse, who to go to next and what you can get.
Read thisHow to Drain a Hot Water Cylinder Safely, Step by Step
Step by step: how to drain a vented hot water cylinder, why an unvented one is different, how to refill it without burning out the immersion.
Read thisHow to Find a Good Plumber in London
What to ask a plumber before they come out, what a good answer sounds like, what a bad one sounds like, and the checks that take five minutes.
Read thisHow To Find An Emergency Plumber At Night
What changes out of hours, the questions to ask on the phone at 2am, and what you can safely do yourself while you wait for an engineer to arrive.
Read thisHow to Get Hot Water Without a Boiler While It Is Fixed
Boiler broken? With a cylinder, the immersion heater is your backup. With a combi, an electric shower, a kettle and a few safe stopgaps until the repair.
Read thisHow to Read a Google Maps Listing for a Plumber
Position on Google Maps is not a quality ranking. Read the review pattern, the photos, the address and the phone call instead, and spot a fake listing.
Read thisHow to Reset a Boiler, and When You Should Stop Trying
Press the reset button once and wait two minutes. Where it is on Worcester, Vaillant, Baxi and Ideal boilers, and when a lockout needs an engineer.
Read thisHow to Reset an Immersion Heater, and When Not To
The immersion reset button sits under the cap on top of the element. How to reach it safely, why it tripped, and when pressing it again is a mistake.
Read thisHow to Set a Heating Timer, and the Hot Water With It
Set the clock first, then the on and off times. How to set a dial timer with pins or tabs, a digital programmer, and the hot water channel, step by step.
Read thisHow to Tell if a Plumber Is Overcharging You
A fair price has three checks: itemised labour and parts, a normal job time, and a figure that does not move once they are inside. How to spot the rest.
Read thisHow to Turn Off a Boiler, and Which Way Is Right for You
Turn a boiler off at the programmer, its own power button, the fused switch or the gas valve. Which to use for a leak, a gas smell, summer or going away.
Read thisHow to Turn Off the Hot Water Supply From Your Cylinder
Switch off the heat first, then close the cold feed valve into the cylinder. Where that valve is on vented and unvented cylinders, and what to do next.
Read thisHow to Turn On an Immersion Heater and Use the Switch
Flip the switch by the cylinder and check the red light. How long to leave it on, what Bath and Sink mean, and when a hot or scorched switch is a warning.
Read thisHow to Turn On Hot Water: Combi, Cylinder or Immersion
How to turn the hot water on with a combi boiler, a boiler and cylinder, or an immersion heater, how to boost it, and what to check when nothing happens.
Read thisIdeal Boiler No Hot Water: What to Check and What Fails
Ideal combi or system boiler giving no hot water? What F1 and L2 mean, the checks to do first, and the parts that fail when the heating still works.
Read thisImmersion Heater Keeps Tripping? Why, and What to Do
An immersion that trips the RCD usually has a failed element or water in its terminal head. What trips, and when, tells you which. Safe checks inside.
Read thisImmersion Heater Leaking? Where the Water Is Coming From
Water around the immersion heater is usually the boss washer, a corroded element or a drip from above. How to make it safe and what the fix involves.
Read thisHow Much Does an Immersion Heater Cost to Run?
A 3kW immersion uses 3kWh for every hour it heats. Work out your cost per hour and per tank, and when the boiler is cheaper. Call 020 4652 5111.
Read thisImmersion Heater Timer: Is It Worth Fitting One?
Which immersion heater timer suits your cylinder, when one actually saves money, how to set it for Economy 7, and why it can stop working. 020 4652 5111.
Read thisInstant Water Heater or Hot Water Cylinder: Which to Choose
Tankless, undersink or cylinder? Why an electric instant heater suits one basin but not a whole house, and how to choose. Call 020 4652 5111.
Read thisInsulating Hot Water Pipes: Which Ones and How to Do It
Start with the pipes at the cylinder and any in the loft or under the floor. Which to insulate, the right foam size, how to fit it and what to leave bare.
Read thisIs a Long Boiler Warranty Worth Anything?
What a ten year boiler warranty really covers, the conditions that keep it valid, what voids it, and how annual servicing decides whether it pays out.
Read thisIs It Worth Repairing an Old Hot Water Cylinder?
The factors that decide whether an old hot water cylinder is worth repairing: where the fault sits, parts, scale history and what a swap would change.
Read thisIs No Hot Water an Emergency? When to Call Tonight, and When It Can Wait
Usually urgent rather than an emergency. When losing hot water needs an engineer tonight, when it can wait until morning, and how to get by until then.
Read thisIsolation Valve Leaking: Why It Happens and What to Do
An isolating valve usually leaks from the spindle after being turned, or from a compression nut. How to tell which, what to try and when to replace it.
Read thisJoule Hot Water Cylinders Explained
Joule Cyclone unvented and heat pump cylinders explained: how they are built, what fails, and which parts an engineer carries. Call 020 4652 5111.
Read thisKingspan Albion Hot Water Cylinders and the Ultrasteel Range
Kingspan hot water cylinders are made by Albion Water Heaters, part of the Kingspan Group. What the Ultrasteel range is, how to spot yours, what fails.
Read thisLandlord Hot Water Responsibilities: What Is Required and How Fast
A landlord must keep hot water working and fix a fault within a reasonable time of being told, faster for total loss in winter. What tenants can do next.
Read thisLandlord or Tenant: Who Pays for a Plumbing Repair?
Where the line sits between landlord and tenant on a plumbing repair, who pays the call-out, what counts as an emergency, and what a tenant is entitled to.
Read thisLeaking Pipe Joint? Compression, Push-Fit and Soldered Fixes
How to stop a leaking compression fitting, why push-fit and soldered joints weep, what you can safely tighten, and when the joint has to be remade.
Read thisLeaking Pipe Under the Sink: Find the Source and Stop It
Water under the kitchen sink comes from the supply pipes, the waste or an appliance hose. How to tell which, stop the drip and know when to call a plumber.
Read thisLocal Plumber or National Company: Which Is Better?
Who actually turns up, how the work gets subcontracted, where the money goes, and what a local firm and a national one are each genuinely better at.
Read thisLow Hot Water Pressure? Why It Happens and How to Improve It
Why hot water can be weak when the cold is strong, the checks you can make yourself, and how to increase hot water pressure for good. 020 4652 5111
Read thisMegaflo Cylinders Explained
How a Megaflo works, how to read the badge, and the parts that fail: immersion, thermostat, pressure and temperature relief valves and a lost air gap.
Read thisWhat Is a Megaflo System? Megaflo Explained in Plain English
A Megaflo system is a mains pressure unvented hot water cylinder made by Heatrae Sadia. How it works, how it differs from a loft tank, what it needs.
Read thisMegaflo No Hot Water: What to Check, and in What Order
No hot water from a Megaflo? The ordered checks that find it: controls, boiler, immersion, then the coil, and where a homeowner should stop.
Read thisMegaflo Service and Repair: What Actually Happens
What an annual Megaflo service covers, what fails between visits, and what a repair call looks like on an unvented cylinder in a London home.
Read thisCan You Have a Mixer Shower With a Combi Boiler?
Yes, a thermostatic mixer shower suits a combi. How boiler size and mains flow set the shower, and why no pump is allowed. Call 020 4652 5111.
Read thisMixergy Cylinders Explained
How a Mixergy cylinder heats from the top down, what the app really controls, where the saving comes from, and what it adds in parts and servicing.
Read thisThe Most Reliable Boiler Brand in the UK, Measured the Way an Engineer Measures It
The most reliable boiler brand judged on mean time to a part, not warranty length. What fails, how fast it is fixed, and why the two are different.
Read thisNo Cold Water From the Tap: What to Check First
No cold water upstairs but the kitchen tap works usually means the loft tank has run dry. No cold anywhere points to the mains. How to tell which you have.
Read thisNo Heating or Hot Water? What Has Failed and What to Do
Lost heating and hot water at the same time? The shared causes to check first, how to get hot water back tonight, and when you need an engineer.
Read thisNo Hot Water: What to Check Before You Call an Engineer
The checks worth doing yourself when there is no hot water, in the order an engineer would do them, and the point where it stops being a DIY job.
Read thisNo Hot Water Upstairs or at One Tap? What It Means
Hot water fine at some taps but cold upstairs, in the kitchen or at the bath? The fault is usually local, not the boiler. How to find it, and when to call.
Read thisNo Water Coming Out of the Hot Tap? Why, and What to Do
Cold works but nothing from the hot tap? Usually an empty loft tank, a closed valve, an airlock, a frozen pipe or a blocked inlet. How to tell which.
Read thisNoisy Water Pipes? What Each Sound Means and the Fix
Whistling, humming, rattling, gurgling or hissing pipes each point to a different cause. How to tell which one you have and when it needs a plumber.
Read thisOSO Cylinders Explained: What a London Owner Should Know
What an OSO cylinder is, how the Norwegian stainless build differs, what to check before you buy one, and how it behaves in London hard water.
Read thisPlumber Call Out Fees Explained: What You Are Actually Paying For
How plumber call out fees work, the charging models you will meet, what the fee actually covers, and what to ask so the final bill holds no surprises.
Read thisPlumbing Survey: What It Checks and When You Need One
What a plumbing survey covers that a homebuyer survey does not: supply pipe, pressure, hot water, cylinder paperwork and hidden leaks. Call 020 4652 5111.
Read thisPotterton Boiler No Hot Water: Causes and What to Do
Potterton boiler with no hot water? What E119 and E133 mean, the checks to make first, and what usually fails on a Potterton combi or cylinder system.
Read thisPre-Plumbed Unvented Cylinder: Is It Worth It?
A pre-plumbed cylinder comes with zone valves and wiring fitted. When it saves time, when a standard one is better, and what to check. Call 020 4652 5111.
Read thisPressure Reducing Valve: What It Does and Signs It Has Failed
A pressure reducing valve holds mains water at a steady, safe pressure. Where yours is, how it is set, the signs it has failed and what to do next.
Read thisSix Questions to Ask a Plumber Before They Start Work
Call-out cover, time charges, qualifications, parts, return visits and paperwork: six questions to ask a plumber, and what a straight answer sounds like.
Read thisRadiators Hot When Only the Hot Water Is On? Here Is Why
Radiators warm with only the hot water on? Usually a motorised valve stuck open, gravity circulation or, on a combi, a diverter valve letting by.
Read thisRange Tribune Cylinders Explained
What a Range Tribune cylinder is, which models turn up in London homes, what actually fails on one, and when a repair beats a replacement.
Read thisSecondary Return Pump Not Working? Why Hot Water Is Slow
Hot water that used to arrive instantly now takes ages? The circulation pump, its timer or a valve on the return loop has usually failed. Checks inside.
Read thisShould You Ever Pay a Plumber Upfront?
For a repair, no. Where materials are bought first, a deposit is fair against a written list. How to stage payments, and when cash upfront is a warning.
Read thisSigns of a Bad Plumber, Before You Hire One
The warning signs that show up on the phone call, in what they refuse to put in writing, and in how they describe a fault they have not seen yet.
Read thisSigns Your Hot Water Cylinder Needs Replacing
Leaks, corrosion, scale, repeat faults, poor insulation, wrong size: how to work out whether your hot water cylinder is worth repairing or finished.
Read thisSolar Diverter for an Immersion Heater: Is It Worth It?
How a solar diverter heats your cylinder with spare solar power, when it pays, when exporting is better, and what the cylinder needs first. 020 4652 5111.
Read thisSolar Thermal Hot Water: Is It Worth It in London?
How solar thermal panels heat your cylinder, how they compare with solar PV, and whether to repair, keep or remove an old system. Call 020 4652 5111.
Read thisSponsored Results on Google Maps: What They Actually Mean
A sponsored Google Maps listing is a paid advert bought at auction, not a quality ranking. How the bidding works and how to read the map pack properly.
Read thisStainless Steel or Copper Cylinder: Which Material Should You Fit
Mains pressure means stainless steel; a loft tank feed means copper is fine. How the two compare on corrosion, weight, lifespan and cost of ownership.
Read thisStopcock Leaking? What to Do Now and When to Replace It
A leaking stopcock is usually the spindle gland, a joint or a cracked body. What you can safely tighten, how to stop the water, and when to replace it.
Read thisTap Won't Turn Off: How to Stop It Running Right Now
A tap that keeps running has a failed washer or ceramic cartridge. Turn it off at the isolating valve or stopcock first, then here is what fixes it.
Read thisTelford Cylinders Explained
What a Telford cylinder is, how the Tempest range is built, where they turn up in London homes, what fails on them and how they compare to Megaflo.
Read thisTelford Tempest Cylinders
Telford Tempest unvented cylinders: how to identify your model, what fails in London hard water, and how each fault is repaired. Call 020 4652 5111.
Read thisThermal Store vs Unvented Cylinder: Which Is Better?
Thermal store or unvented cylinder? How they differ on pressure, flow, running cost, rules and flats, and which suits your home. Call 020 4652 5111.
Read thisTwin Coil Cylinder: Do You Need One?
What a twin coil cylinder is, when it is worth buying, how to tell if you have one, and what to do if the solar coil is unused. Call 020 4652 5111.
Read thisUndersink Water Heater Not Working? Common Faults and Fixes
No hot water, lukewarm water or a drip from the heater under the sink? How to tell a tripped cut out from a failed element or a leak, and what to do.
Read thisWhat Happens in an Annual Unvented Cylinder Service
The full list of checks in an annual unvented cylinder service, what each one is for, and what an engineer finds most often on London cylinders.
Read thisUnvented vs Vented Cylinder: How They Differ, and Which One You Have
What separates an unvented cylinder from a vented one: shower pressure, loft space, servicing and the faults each one gets. Plus how to spot yours.
Read thisVaillant Boiler No Hot Water: Causes and What to Check
Vaillant ecoTEC with no hot water? What an F code means, the checks to make first, and the parts that fail when the heating still works.
Read thisVaillant uniSTOR Cylinders Explained
An engineer explains the Vaillant uniSTOR range, how it pairs with a Vaillant system boiler, what actually fails on one and how easy the parts are to get.
Read thisVaillant vs Ideal: Which Boiler Actually Lasts Longer?
Vaillant or Ideal, which lasts longer in a London home? An engineer on heat exchangers, diverter valves, parts supply and what really decides it.
Read thisViessmann Boiler No Hot Water: Causes and What to Check
Viessmann Vitodens with no hot water? What a fault code or reset means, the checks to make first, and the parts that fail when the heating still works.
Read thisVokera Boiler No Hot Water: Causes and What to Check
Vokera combi with hot radiators but cold taps? It is usually the hot water flow switch, the diverter or a scaled plate. The checks to do before you call.
Read thisWarm Water From the Cold Tap? What Causes It and the Fix
Cold tap running warm? Usually pipe heat, hot crossing over through a mixer, a flat expansion vessel or a loft tank being heated. How to tell which.
Read thisWater Escaping In The House: What To Do In The First Five Minutes
Water escaping at home: find the stopcock, deal with the electrics safely, contain the damage, and photograph what an insurer will ask you for.
Read thisWater Hammer: Why Your Pipes Bang and How to Stop It
A bang in the pipes when a tap or appliance shuts off is water hammer. What causes it, the checks you can make, and the fixes that stop it for good.
Read thisWeekend and Bank Holiday Plumber Rates: What Changes and What Should Not
What a weekend or bank holiday plumbing rate should cover, what must not change, and how to tell a job that can wait until Monday from one that cannot.
Read thisWhat a Cylinder Replacement Actually Costs
The real cost drivers behind an unvented cylinder replacement: size, type, position, pipework changes, access, removal of the old vessel and making good.
Read thisWhat a Hot Water Cylinder Service Should Include
What a proper cylinder service covers, how long it should take, and how to tell a thorough visit from an engineer who only had a quick look at it.
Read thisWhat a Plumbing Quote Should Actually Include, Line by Line
Labour basis, named parts, access and making good, VAT and what happens when scope grows. How to read a plumbing quote, with a checklist before you accept.
Read thisWhat Is a Call-Out Fee? Meaning and What It Covers
A call-out fee is a fixed charge to get an engineer to you and diagnose the fault, due whether or not you go ahead. What it should and should not cover.
Read thisWhat Is a Condensing Boiler? And Why Yours Is Probably One
A condensing boiler recovers heat from its own flue gases. Combi, system and regular boilers can all condense. How to tell, and the winter fault to know.
Read thisWhat Is a Heat Exchanger? Boilers, Combis and Cylinders
A heat exchanger moves heat from one water circuit to another without mixing them. Where yours are, what each one does, and the signs one is failing.
Read thisWhat Is a System Boiler? How It Works With a Cylinder
A system boiler heats your radiators and a hot water cylinder, with the pump and expansion vessel built in. How it works, how to spot one, and what fails.
Read thisWhat Is an Airing Cupboard? What Is Inside and What to Check
An airing cupboard is the warm cupboard built around your hot water cylinder. What the pipes and valves in it do, what to store there and warning signs.
Read thisWhat Is an Immersion Heater, and Why Have One and a Boiler?
An immersion heater is an electric element that heats the water in your cylinder. How it works, why it sits alongside a boiler, and signs it has failed.
Read thisWhat No Call-Out Fee Actually Means
No call-out fee rarely means a free visit. Here is where that cost reappears, how to compare two firms fairly, and the questions that expose the total.
Read thisWhat Size Hot Water Cylinder Do I Need?
Cylinder sizes in litres by bathrooms and occupancy, why recovery time matters as much as capacity, what oversizing costs and whether it will fit.
Read thisWhat Temperature Should a Hot Water Cylinder Be Set At?
Store hot water at 60°C to control Legionella and get at least 50°C at the taps. Where the settings are, and why lower or higher costs you. 020 4652 5111.
Read thisWhat Temperature Should I Set My Boiler? Heating and Hot Water
Heating dial around 60C on most condensing boilers, hot water around 50C on a combi. When to go higher, and why a cylinder needs the boiler hotter.
Read thisWhat to Ask Before Agreeing to a New Boiler
The questions that separate a proper boiler survey from a sales visit, what a straight answer to each one sounds like, and what a vague answer is hiding.
Read thisWhat to Do Before the Plumber Arrives
Stopcock, isolation, electrics, access and photographs. The ten minutes before an engineer knocks decide how long the job takes and what it costs you.
Read thisWhat To Do If a Plumber Does a Bad Job
A plumber did a bad job on your home. Here is the order to handle it: raise it in writing, allow a return, gather evidence, escalate, and when to stop.
Read thisWhat To Do If Water Is Coming Through The Ceiling
Power off, everyone out from under it, stop the water at the stopcock, then photograph it all. The first ten minutes, in order. Leak help: 020 4652 5111.
Read thisWhat to Do If You Smell Gas at Home
Turn the gas off at the meter, open windows, no switches or flames, then call 0800 111 999. What happens next, and how to check for a gas leak safely.
Read thisWhat To Do When a Plumber Does Not Turn Up
A plumber has not turned up. Here is what to do in the first hour, how to read what it tells you about the firm, and how to get a deposit back.
Read thisWhat Your Insurer Means By Trace And Access
Trace and access cover pays to find a hidden leak, reach it and make good, but not to fix the pipe. What it includes, excludes, and what a report must say.
Read thisWhen to Turn the Heating On, and What to Check First
Turn it on when rooms stay below about 18C, not by date. The checks to run before the first cold night, and whether leaving it on low all day is cheaper.
Read thisWhere Is My Stopcock and How Do I Turn It Off?
In most houses the stopcock is under the kitchen sink and closes clockwise. Where to look in a flat, what it looks like, and what to do if it is seized.
Read thisWhich Boiler Brand Is Best? An Engineer's View From Inside the Casing
Which boiler brand is best, judged on what actually fails, how quickly parts arrive, how serviceable the appliance is and how it copes with London water.
Read thisWhich Immersion Heater Do I Need? Sizes, Types and Ratings
How to match an immersion heater to your cylinder: length, boss size, 3kW rating, copper, Incoloy or titanium, and when only the maker's part will do.
Read thisWho Is Responsible for a Leak in a Leasehold Flat?
Who repairs and who pays for a leak in a leasehold flat, where the lease draws the line between flat owner and freeholder, and what to put in writing.
Read thisWhy Emergency Plumbing Costs More Out of Hours
What you are paying for at 3am: standby cover, van stock, closed wholesalers and work done in the dark. The real cost structure, explained plainly.
Read thisWhy Hot Water Systems Fail Earlier in London
London hard water shortens the life of combi heat exchangers, cylinders, immersions and showers. How the damage happens and what genuinely slows it down.
Read thisWhy the Cheapest Quote Is Usually the Most Expensive
What gets cut to reach the lowest number on a plumbing quote, why the second visit costs more than the saving, and how to compare three quotes honestly.
Read thisWhy the Sponsored Result Costs You More
How the ad auction works, what a click costs in the plumbing trade, and the three routes that advertising spend takes to reach your invoice.
Read thisWorcester Boiler Flashing Blue Light: What It Means and What to Do
A flashing blue light on a Worcester Bosch boiler usually means a lockout. What to check, when a reset is safe, and when to call a Gas Safe engineer.
Read thisWorcester Boiler No Hot Water: Causes and What to Check
No hot water from a Worcester Bosch boiler? The checks to make first, what it means if the heating still works, and the faults that need an engineer.
Read thisWorcester Bosch vs Vaillant: An Engineer's Verdict
An engineer compares Worcester Bosch and Vaillant on what actually fails, parts availability, hard water behaviour and how each one is serviced.
Read thisY Plan and S Plan Heating Systems: Which One You Have
A Y plan uses one 3 port valve, an S plan uses two 2 port valves. How to spot yours in the airing cupboard, and what each one does when hot water fails.
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Checking a plumber before you let them start
How to check a plumber on the gas safe register is the page this group is built on, because it is the one check that is free, takes a minute and settles a question nobody can talk their way around. How to check a plumber is qualified for unvented work is the same exercise for the specific competence that matters on a sealed cylinder, which the gas register on its own does not tell you about.
Everything else here is the softer signals. How to find a good plumber in London is the general version. Signs of a bad plumber before you hire one and questions to ask a plumber before they start work are the two that get read most, because they are what somebody wants at the point where a stranger is about to be let into a property and a decision has to be made in five minutes on a doorstep.
Then there is the question of where the recommendation came from in the first place. Checkatrade, Trustatrader and what a directory badge actually means sets out what a badge mechanically certifies and what it leaves untouched, so a reader can weigh it for themselves rather than take it as a verdict. Are directory reviews trustworthy does the same for the star rating attached to it. How to read a google maps listing for a plumber is the equivalent for the map pack, and it pairs with sponsored results on google maps: what they actually mean and why the sponsored result costs you more, which explain the difference between a listing that earned its position and one that bought it. Local plumber or national company: which is better is the structural version of the same question.
Common plumbing scams and how to avoid them sits with these because the patterns it describes are mechanisms, not accusations, and knowing the mechanism is what makes it visible on the day. If the job has already gone wrong, the same group carries the aftermath: what to do if a plumber does a bad job, how to complain about a plumber, can you withhold payment from a plumber, and what to do when a plumber does not turn up.
What the work costs and what a quote should say
Plumber call out fees explained carries this group. It is the page about the mechanism of the fee itself: what a plumber is charging for when they charge to attend, what the fee is supposed to buy, and where it stops. What is a call-out fee and what should it cover is the shorter, cross trade version of the same question, and what no call-out fee actually means takes the advertised version apart, because a fee that has been removed from the headline has usually been moved rather than dropped.
Hourly rate or fixed price: which is better for you is the structural choice underneath all of it, and it turns on how predictable the job is rather than on which number looks smaller. How long should a plumbing job take is the sanity check on an hourly rate, which is the only thing that makes an hourly rate safe to accept.
On quoting, do plumbers charge for quotes answers the question people are embarrassed to ask, and what a plumbing quote should actually include goes through a quote line by line so a reader can see what has been left vague. Why the cheapest quote is usually the most expensive is the argument the other two lead to. How to tell if a plumber is overcharging you and should you ever pay a plumber upfront are the two protective pages in the group.
Two pages deal with time of day and day of week, and they are narrower than they look. Weekend and bank holiday plumber rates is about what changes on a Sunday and what should not. Why emergency plumbing costs more out of hours is about the mechanism after six in the evening: what genuinely costs more to run at night, and what gets added to a bill for no reason other than the hour on the clock. Our own position is that the rate is published and does not move for the evening, which is exactly why both pages are worth reading before anybody quotes you.
Boiler brands and the replacement decision
Which boiler brand is best is the umbrella for this group. It takes the bare question of which boiler is best and answers it from the position of somebody who opens these appliances rather than somebody who sells them. Boiler brands to avoid and why is the page that does the real work in it, because the useful question is never which badge is best in the abstract, it is which decisions about parts, boards and serviceability make an appliance expensive to keep running in year eight.
The most reliable boiler brand in the UK, measured the way an engineer measures it is the page that defines what reliability even means here, and it stays on failure rates and repair patterns rather than on the word best. The head to head pages sit under it: worcester bosch vs vaillant, baxi vs worcester bosch: which one would we fit, and vaillant vs ideal: which boiler actually lasts longer. Each of them argues from the mechanism, which parts fail, how available they are and what a board costs to replace, and none of them attributes a motive to a manufacturer.
Is a long boiler warranty worth anything and how long should a boiler last are the two pages about expectation, and they contradict each other in a useful way: a long warranty says something about the terms, not about the appliance. What to ask before agreeing to a new boiler is the page to have open when somebody is standing in the kitchen with a proposal. Combi or system boiler with a cylinder is the fork in the road that decides everything after it, and it is the one page in this group that leads straight into the cylinder section below. Where the decision has already been taken, boiler replacement is the service page all of this ends at.
Choosing, sizing and keeping a cylinder
Unvented vs vented cylinder is the page this group rests on, because a surprising number of people do not know which of the two they have, and almost every decision after that depends on the answer. How to choose a hot water cylinder is the next step for somebody who does know, and what size hot water cylinder do I need is the question that gets answered wrong most often, usually by sizing on bedrooms instead of on how many outlets run at once.
Best unvented cylinder brands is the equivalent of the boiler brand pages for stored systems, and it turns on the same things: parts availability and how serviceable a unit is once it is a decade old. How long does a hot water cylinder last sets the expectation, and signs your hot water cylinder needs replacing is the symptom list that tells you when you have reached it. Is it worth repairing an old hot water cylinder is the economic version of the same decision, and the two are deliberately separate because they get asked at different moments.
On keeping one alive, what a hot water cylinder service should include is the checklist a customer can hold a plumber to, and what happens in an annual unvented cylinder service describes the visit itself from the engineer side. Neither replaces the service page; they exist so a reader knows what they are buying.
Two pages explain why any of this is more urgent here than elsewhere. Hard water and hot water cylinders in London is the mechanism, which is scale on the coil and what it does to the heat transfer. Why hot water systems fail earlier in London is the consequence, which is lifespan and replacement timing in property that was not built with these systems in mind.
Water escaping and who pays for it
What to do if water is coming through the ceiling is the page this group leads with, because it is the moment people actually search, and the first two minutes decide how much of the damage is avoidable. Water escaping in the house: what to do in the first five minutes is the broader version, and where is my stopcock and how do I use it is the single most useful thing on this site for somebody who has never had to find one in a hurry.
After the water stops, the question turns into money. What your insurer means by trace and access explains the part of a policy that covers finding the leak rather than fixing the damage, and it is routinely the most valuable clause in the document. Who is responsible for a leak in a leasehold flat is the one that decides whether a bill lands on a leaseholder, a freeholder or a neighbour, and landlord or tenant: who pays for a plumbing repair is the rented equivalent. Landlord hot water responsibilities sets out what is required of a landlord on hot water specifically and when it becomes required.
What to do before the plumber arrives closes the group. It is short, and it is the difference between an engineer starting work on arrival and spending the first half hour moving furniture and looking for an isolation valve.
Not sure which of these it is? Tell us what the taps are doing.