N6 N8 N10

Boiler Repair in Highgate, Muswell Hill and Crouch End

Gas Safe engineers across N6, N8 and N10, 24 hours a day.

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

What is the boiler doing?

Nearly every house here kept its cylinder, so the symptom usually tells us which of the two appliances failed.

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

"Very professional and would recommend to anyone!"
Abby M.
"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.

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.

We cover Muswell Hill, and the whole of London

Tell us the address and you will get an honest answer about timing. View areas we cover

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 cylinderAround here nearly every house still has one. 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. Parts are guaranteed for a year.

If a repair is not worth doing, we will say so on the phone. Call 0203 868 6134.

We come to every street around here

Almost nobody says they live in N10. They say Muswell Hill, or Fortis Green, or the Broadway.

Names we hear on N6, N8 and N10 calls, and the postcodes around them

Grouped by postcode, because that is the one part of an address everybody knows.

N10Muswell Hill, Muswell Hill Broadway, Fortis Green, Rookfield and Alexandra Park
N8Crouch End, Hornsey, Stroud Green and the Harringay ladder
N6Highgate Village, Holly Lodge, Highpoint and the Dartmouth Park border
N19Archway, Upper Holloway and Whitehall Park
N4Finsbury Park and Stroud Green

We work right across London, north and south of the river. If yours is not here, ring and tell us the address.

One developer built most of these streets

Which is why the boiler is in the same cupboard in half of them.

Muswell Hill went up almost entirely between 1897 and 1914, largely by two developers, James Edmondson and W.J. Collins. That is why the stock is so consistent street to street: the same Edwardian layout, the same three storeys, the same airing cupboard on the half landing. Crouch End and Hornsey are a little earlier and carry more conversions. Highgate is older again, and much of it sits in a conservation area. What they share is the cylinder. These were family houses and they stayed family houses, so the tank never came out. That means two appliances, not one, joined by motorised valves and two or three zones, with a pump keeping hot water standing ready upstairs. Six things can fail and only one of them is the boiler. Then the loft went in. Across N10 and N8 the 2000s loft conversion is the local signature, and it moved the room without moving the cylinder. The tank is now behind a stud wall, in an eaves cupboard, or up a hatch that a replacement cylinder will not physically pass through. That is worth establishing on the phone rather than on the doorstep.

Did you know A house with a cylinder keeps hot water for a while after the boiler has stopped, because the tank holds what it already heated. It is why people ring a day later than they should. If the heating has gone, the boiler has already failed, whatever the taps are still doing.

Heating fine, hot water gone

The commonest call from N10, and it is rarely the boiler.

On a stored system, heating that works and hot water that does not points at the cylinder side. Three usual culprits: the motorised valve that diverts flow to the tank, the cylinder thermostat, and the immersion element. Each costs a fraction of a new appliance and each gets mistaken for one. The other pattern here is the top floor running cold while the ground floor is fine, and in a house with a converted loft that is now three floors above the boiler. A pump keeps hot water moving so the top does not wait. When it seizes, or the circuit furs up, the furthest tap notices first. An unvented cylinder is a pressurised store, so working on one is notifiable and needs a G3 qualification on top of Gas Safe registration. Plenty of firms hold one and not the other, which is why a cylinder call so often becomes two visits. Our engineers hold both, so it is one visit and one charge. See unvented cylinder repair.

Water running from a pipe outside? If it comes from a tundish, the cylinder is discharging and a safety device has failed. Turn the boiler off, isolate the cold feed if you can find the stopcock, and call. That is an emergency, not a booking for next week.

What hard water is doing to your boiler

The one thing a yearly visit genuinely prevents.

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. Where it lands is what differs. In a combi it furs the plate heat exchanger and the hot water goes lukewarm. In an Edwardian house in Muswell Hill or Crouch End that kept its cylinder it lands on the coil inside the tank and in the secondary circuit instead. Same water, different part, and a scaled coil reads as a failing boiler often enough that boilers get condemned for it.

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, and a power flush deals with what is already in there.

Google Reviews

"Engineer excellent and very time efficient."
Fiona G.
"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

Repair or replace

Age does not decide it. The failed part does.

A pump, a diverter valve, a thermostat or a fan is a repair on almost any appliance, whatever its age. A failed main heat exchanger on a boiler well past ten years is the point where the arithmetic stops working, and we will tell you that rather than sell you the repair. What we will not do is use age on its own as the argument. A great many boilers in N10 are older than the people quoting to replace them suggest is acceptable, and are running perfectly. The one thing that genuinely does change the sums here is the loft conversion: if the cylinder cannot come out through the hatch, a like for like swap is not the simple job it looks. Our boiler replacement page sets out what a replacement actually involves, including what changes when a stored system is converted, and the costs guide explains what moves the figure.

That answer costs nothing. It is the one most people ring us for. Call 0203 868 6134.

Nearby areas

Next door to here we cover Totteridge, Whetstone and Mill Hill and Islington and Highbury. Everything else is on boiler repair in north London and areas we cover.

WimbledonThe Village and the parkside roadsView services Chislehurst and BeckenhamLarge detached on stored hot waterView services CoulsdonValley chalk, very hard waterView services Esher, Claygate and Thames DittonPlant rooms and multiple appliancesView services Balham and Wandsworth CommonVictorian terraces off the commonView 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.

Cylinder in an eaves cupboard?

Tell us where it is and how you get to it. Access is genuinely half this job, and knowing about the hatch before we arrive saves an hour on the day.

Call 0203 868 6134

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

Do you cover my street in Muswell Hill?

Yes. The names listed above are the ones we hear most, and they are nowhere near a complete list. We work right across London, north and south of the river. Ring and tell us the address and you will get a straight answer about timing.

My radiators are hot but there is no hot water. Do I need a new boiler?

Almost certainly not. In a house with a cylinder that points at the cylinder side: the motorised valve that diverts to the tank, the cylinder thermostat, or the immersion element. All three cost a fraction of an appliance. Our unvented cylinder repair page explains what is involved.

The cylinder is in the loft conversion and I cannot reach it. Is that a problem?

Not for a repair. Most cylinder faults are the thermostat, the valve or the element, and all three are reachable through a normal hatch. It matters for a replacement, because a cylinder that went in before the conversion sometimes cannot come back out the same way. Tell us on the phone and we will look at it properly rather than discovering it on the day.

The top floor tap runs cold but downstairs is fine. What is that?

Usually the secondary circuit rather than the boiler. In a tall house a pump keeps hot water standing ready at the top, and when that pump fails or the circuit scales up, the furthest tap is the one that notices first. It is a repair, and worth a service afterwards to stop it recurring.

Do you repair Vaillant and Baxi boilers in Muswell Hill?

Yes, and every other major make. Those two are the ones we see most in N10, usually system boilers feeding a cylinder rather than combis. Glow-worm, Potterton and Viessmann are common in the Crouch End conversions. If your boiler is showing a fault code, the brand pages explain what that code means for your make.

I am a landlord with a flat in N8. Can you do the certificate too?

Yes, and on the same visit where the appliance passes, so a let property is not off the market twice. See landlord gas safety certificates. If the flat has no gas supply we cover electric boilers as well.

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 drives the figure.

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.

The makes we see most in N10

Every major make, and the fault code pages often name the part before you ring.

The split here follows the housing, and the housing barely changes. The Edwardian family houses that kept a cylinder run system boilers, mostly Vaillant and Baxi, with Ideal common in anything replaced in the last decade. The Crouch End conversions and the Highgate flats run combis, where Glow-worm, Potterton and Viessmann all turn up and the plate heat exchanger is the first thing we check. If your boiler is showing a code, the make decides what it means. A Vaillant F75 and a Baxi E119 are different faults with different fixes, and neither of them on its own means a new boiler. Each brand page lists the codes for that make and what actually causes them.

The full list is on our boiler brands page, and general repairs are on boiler repair in London.

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
"Took his time to listen to my concerns hence it was a nice job. Thank u so much"
Frank E.
"Steve was very helpful and responsive"
Richard E.

Book an engineer in Muswell Hill

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.