South of the river

Boiler Repair in South London

South and south west London. Every postcode, 24 hours a day.

Answered 24 hours a day by a technical customer service member.

What is the boiler doing?

Most of the housing here stores its hot water, which means two appliances and six things that can fail.

Gas Safe registered engineers
An engineer as soon as we can, booked around you
Cylinder and unvented systems as well as combis
Parts guaranteed for a year, rates agreed before work starts

No heating or hot water right now? Call 0203 868 6134. We will tell you the earliest realistic slot rather than the one you want to hear.

Google Reviews

"He was very professional tidy and polite. Would recommend!"
Anna M.
"These guys provide an excellent service. A pleasure to deal with and professional"
Day Walker
"Steve was very helpful and responsive"
Richard E.

Prefer we call you? Request a call back

Two details to start. Add your postcode and whether there is a cylinder in an airing cupboard and we can usually tell you the likely part before we attend.

South West London

Richmond upon Thames, Kingston, Merton and Wandsworth, and over the boundary into Elmbridge. Large houses on stored hot water, and the heaviest concentration of unvented cylinders anywhere on the list.

TW9 TW10 TW1 TW2Richmond and TwickenhamGeorgian and Victorian, strong unvented layer KT1 KT2 KT5 KT6Kingston, Coombe and SurbitonCoombe Hill and Kingston Hill KT10 KT7 · Elmbridge, SurreyEsher, Claygate and Thames DittonPlant rooms and more than one appliance SW19 SW20 · MertonWimbledonThe Village and the parkside roads SW15 SW13 · Wandsworth and RichmondPutney and BarnesHouses and mansion flats mixed SW4 SW11 · Lambeth and WandsworthClapham and BatterseaWhole-house Victorians and conversions SW12 SW18 · WandsworthBalham and Wandsworth CommonVictorian terraces off the common

South East London

Southwark, Lambeth, Lewisham, Greenwich and Bromley. Tall Victorians with long pipe runs, Georgian terraces with listed flue constraints, and the highest ground in this half of London.

SE24 SW2 · LambethHerne Hill and BrixtonWhole-house Victorians, cylinders common SE21 SE22 · SouthwarkDulwichLarge detached, cylinders standard SE3 SE10Blackheath and GreenwichGeorgian terraces, listed flue constraints SE26 SE23 · LewishamSydenham and Forest HillTall Victorians with long pipe runs SE19 · Bromley, Croydon and LambethCrystal PalaceHigh ground, so mains pressure matters BR7 BR3 · BromleyChislehurst and BeckenhamLarge detached on stored hot water

Those areas sit across Richmond upon Thames, Wandsworth, Lambeth, Southwark, Merton, Kingston upon Thames, Elmbridge, Greenwich, Lewisham, Bromley, Sutton, Croydon and Epsom and Ewell. Crystal Palace is the odd one: five boroughs meet on that hill, which is why an SE19 address can sit in a different one from the house across the road. Whichever of them you are in, it is the same engineers, the same rate agreed before anybody sets off, and the same year on the parts.

The North Downs and the Surrey border

Croydon and Sutton, and over the boundary into Epsom and Ewell. Interwar and postwar detached houses on chalk ground, where the incoming mains gives out before the boiler does.

SM1 SM2 SM3Sutton and CheamChalk belt, scale the first check CR0CroydonTown centre flats, many all-electric CR8 · CroydonPurley and KenleyChalk belt, scaled plate exchangers CR2 · CroydonSanderstead and SelsdonInterwar detached on chalk ground CR5 · CroydonCoulsdonValley chalk, scale the first check KT17 KT19 · SurreyEpsom and EwellLarge family houses into Surrey

Also on the round every week: Mortlake, Sheen, Teddington, Hampton, Earlsfield, Tooting, Streatham, Peckham, Brockley, Catford, Eltham, Bromley, Morden and Molesey. Every area we have written up is on areas we cover, and the other half of London is on boiler repair in north London.

What happens when you call

Three steps. The first one usually tells us most of it.

Tell us where you are and whether there is a cylinderSouth of the river most of the housing stores its hot water. That single answer decides which of the two appliances we are diagnosing, before anybody sets off.
You will know what has probably failed, and when we can comeWe tell you the likely part and a realistic slot. If we cannot reach you today we say so on the phone, rather than after you have waited in.
Nothing starts until you have agreed the costThe engineer runs a full diagnostic, then puts the fault, the part and the labour in writing. Nothing proceeds until you have seen it.

Tell us where you are, and whether there is a hot water cylinder in an airing cupboard. With those two answers we can usually name the part before anybody sets off. Call 0203 868 6134.

A second opinion before you replace anything

Worth checking before you spend anything.

The commonest symptom here is hot water that has gone lukewarm and unpredictable while the heating carries on perfectly. It reads like a dying boiler. It usually is not one. In a combi it is the plate heat exchanger, furred with scale. On a stored system it is the cylinder coil, the immersion element, or the motorised valve that diverts to the tank. Each of those costs a fraction of a new appliance. Each of them gets mistaken for the appliance. The mistake is expensive in both directions. A boiler gets replaced and the symptom survives, because the fault was in the tank. Or a part gets fitted to a boiler that was working, the problem returns, and it is paid for twice. We check before we condemn. The rate is agreed on the phone, the engineer runs a full diagnostic, and you get a written breakdown before a spanner is lifted. If the answer really is a new boiler we will tell you plainly, and if it is not, we will tell you that too, and there is nothing to pay for being told.

Did you know Scale drops out of solution faster the hotter the water gets. A combi set to deliver taps at 65 degrees furs its plate heat exchanger noticeably faster than one set to 50, which is still hot enough to scald. Turning that dial down costs nothing and is the most effective thing a householder can do between services.

Most firms will not touch an unvented cylinder

It is a separate qualification, and this is where the housing needs it most.

It needs a separate qualification. An unvented cylinder is a pressurised store, so it carries safety devices, and working on one is notifiable. That takes a G3 qualification on top of Gas Safe registration. Plenty of firms hold one and not the other. So a call about a cylinder turns into two visits from two trades. Or into a recommendation to replace the boiler, because the boiler is the part they are allowed to touch. Our engineers hold both, so the boiler and the cylinder are one visit and one charge. That matters more here than almost anywhere. Richmond, Kingston, Esher, Dulwich, Chislehurst and Blackheath all run heavily on stored hot water. In Esher and Claygate a plant room with more than one appliance is common.

Water running from a pipe outside? If it is coming from a tundish, the cylinder is discharging and one of its safety devices has failed. Turn the boiler off, isolate the cold feed if you can find the stopcock, and call. It is not something to leave, and it is certainly not something to cap off. See unvented cylinder repair.

Weak hot water is usually the mains, not the boiler

It is the one thing a cylinder cannot be talked into.

An unvented cylinder runs off the incoming mains, so it needs pressure and flow to deliver anything at the tap. A vented tank in the loft does not care, because gravity does the work. Thousands of these houses swapped one for the other, and the mains became the limit. On higher ground a weak supply shows itself first. That means Crystal Palace, Sydenham and Forest Hill, and up onto the Downs at Coulsdon and Purley. The symptom is a shower that was fine for years and is now poor. The cause is often nothing to do with the cylinder or the boiler. Measure it before anybody sells you an appliance to fix it.

If the mains is the problem, an accumulator or a pump solves it and a new boiler does not. We will say which it is before anything is ordered. Call 0203 868 6134.

What hard water is doing to your boiler

And it is the one thing a yearly visit genuinely prevents.

It is furring the part that makes your hot water. London water comes off the Thames and the Lea, both of which run through chalk. It measures roughly 277 milligrams of calcium carbonate per litre, and that figure is much the same across the city. It is hard enough to fur a plate heat exchanger faster than your boiler manual assumes. That is why so many London boilers lose their hot water years before they lose anything else. Two parts stop it, and they do different jobs. A scale reducer on the mains protects the hot water side. A magnetic filter on the return catches the magnetite that blocks exchangers and seizes pumps. Both go in during a yearly service, at which point the boiler stands a real chance of outliving its guarantee.

Already lost the hot water? That is usually the exchanger or the cylinder coil rather than the appliance, and it is a repair rather than a replacement. Call 0203 868 6134 and we will tell you which before anybody attends.

Google Reviews

"Very polite and respectable engineer...had two other heating company that struggle to find the issue with my boiler but ASAP repaired it on the same day thanks absolute life saver"
JA Morris
"Very professional and would recommend to anyone!"
Abby M.
"Took his time to listen to my concerns hence it was a nice job. Thank u so much"
Frank E.

Found your area?

Tell us where you are, what the boiler is doing, and whether there is a cylinder in an airing cupboard. Those three answers usually tell us what has failed before anybody sets off.

Call 0203 868 6134

Boiler and cylinder, one visit

Gas Safe and G3 qualified, so nothing waits on a second trade. Call 0203 868 6134

More than boiler repairs

All at the same rate, in every area on this page.

Emergency boiler repairNo heat or hot water tonight. We tell you on the phone whether somebody can reach you today, before you rearrange your evening.
Boiler repairA full diagnostic, the rate agreed first, and a written breakdown of the fault, the part and the labour before anything starts.
Unvented cylinder repairMost firms will not touch it. Ours are G3 qualified as well as Gas Safe, so the boiler and the cylinder are one visit and one charge.
Boiler servicingThe visit that stops next winter's breakdown. A scale reducer and a magnetic filter go in while we are there, which in London water is worth more than the service.
Power flushingFor radiators cold at the bottom and a boiler that bangs. It fixes the cause rather than replacing the part the sludge broke.
Boiler replacementOnly when the arithmetic says so. We will tell you a boiler is worth keeping, which is not what everybody quoting you will say.
Landlord gas safety, CP12Certificate and any repair on the same visit where the appliance passes, so a let property is not off the market twice.
Electric boiler repairNo gas supply, which is a lot of London flats. Same engineers, same rate, same year on the parts.

We would rather repair than replace. Age does not decide it, the failed part does. If a repair is not worth doing we will say so, and that answer costs nothing.

Two more worth a look. What a repair or a replacement costs is driven by the part, not the postcode, and our costs guide explains what moves the figure. Every make we work on is listed on boiler brands.

Richmond and TwickenhamUnvented cylinders are the normView services Highgate, Muswell Hill and Crouch EndEdwardian houses that kept their cylindersView services Sydenham and Forest HillTall Victorians, long pipe runsView services Chiswick and Bedford ParkBig Victorians on S-plan systemsView services Ealing and NorthfieldsLarge Edwardian houses, zoned heatingView services All areasEvery area we have written upView all

These are where we work most, not a boundary. An engineer attends anywhere in north London and south London. Tell us where you are and we will say plainly when we can get to you.

Safety

If you smell gas: do not touch any switches. Open the windows, leave the property, then call the National Gas Emergency Service on 0800 111 999. That line is free and open 24 hours. Call them before you call us. If a carbon monoxide alarm is sounding: get everyone out immediately, then call 999 if anyone feels unwell. Do not go back in until the property has been ventilated and checked. If the boiler locks out repeatedly: try one reset. If it locks out again straight away, stop. Repeated resets hide a fault that is still there, and on a gas appliance that is not a risk worth taking. Under the Gas Safety (Installation and Use) Regulations 1998, only a Gas Safe registered engineer may work on gas appliances. Never open the boiler casing yourself.

Common questions

Which areas do you work in south of the river?

All of them. The areas listed above have a page of their own because the housing there has a pattern worth writing about, but an engineer attends every postcode south of the river. If yours is not among them that is not a no, it is just somewhere we have not written up yet. The full list is on areas we cover.

Do you work on unvented cylinders, or only combis?

Both, and the cylinder side is a large part of what we do here. Unvented work is notifiable and needs a G3 qualification on top of Gas Safe registration. Our engineers hold both, so it is one visit and one charge rather than two of each. Our unvented cylinder repair page explains what is involved.

Water is running from a pipe outside. What is that?

If it is coming from a tundish, an unvented cylinder is discharging and one of its safety devices has failed. Turn the boiler off, isolate the cold feed if you can find the stopcock, and call. It is not something to leave and it is certainly not something to cap off. That is an emergency call-out, not a booking for next week.

My shower has gone weak but nothing has broken. Why?

On an unvented system the incoming mains does all the work, so pressure and flow at the street decide what you get at the tap. On higher ground that shows itself first. It is measurable in a few minutes, and if the mains is the limit then an accumulator or a pump solves it, where a new appliance would not.

Will I know the cost before you start?

Yes. The rate is agreed on the phone before anybody sets off, and the engineer gives you a written breakdown of the fault, the part and the labour before any repair begins. Nothing goes ahead until you have seen it. Our costs guide sets out what actually drives the figure.

Do you charge more for one area than another?

No. The rate is the rate and it is agreed before we set off. What varies between one call and the next is availability, never price, and we will tell you which it is when you ring.

What if the boiler is not worth repairing?

We tell you, and there is nothing to pay for being told. Age alone does not decide it, the failed part does. If replacement genuinely is the better spend we will say so, and our boiler replacement page sets out what that involves.

Are you available at night and at weekends?

The line is answered 24 hours a day by a technical customer service member, not a call centre reading from a script. In the middle of the night we will tell you honestly whether it is a tonight job or a first thing in the morning job.

Boiler brands we repair

Every major make. The fault code pages will often tell you what has failed before you even call.

Google Reviews

"Engineer excellent and very time efficient."
Fiona G.
"Very happy with this company very and professionally service. Fixed my leaking TRV and after draining my system and the refilled and vented the air . Thank you I have heating now"
Jamie K.
"Efficient and amiable service all round. Even managed to save me money by fixing a thermostat that we thought was broken."
Graziano B.

Book an engineer south of the river

Tell us where you are and whether there is a cylinder in an airing cupboard. With those two answers we can usually name the likely part, give you the rate, and book somebody in, all on the one call.

Call 0203 868 6134 Book an engineer online

Gas Safe registered. Unvented cylinder qualified. Parts guaranteed for a year. Covering London, north and south of the river, 24 hours a day.