Gas Safe registered
KT10 KT7
Gas Safe and G3 qualified engineers across KT7 and KT10, 24 hours a day.
Answered 24 hours a day by a technical customer service member.
Houses here often run more than one appliance, so the first job is establishing which one actually failed.
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.
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 Esher, and the whole of London
Tell us the address and you will get an honest answer about timing.
View areas we coverThree steps. The first one usually tells us most of it.
If a repair is not worth doing, we will say so on the phone. Call 0203 868 6134.
Almost nobody says they live in KT10. They say Claygate, or Hinchley Wood, or Weston Green.
Names we hear on KT7 and KT10 calls, and the postcodes around them
Grouped by postcode, because that is the one part of an address everybody knows.
We work right across London, north and south of the river. If yours is not here, ring and tell us the address.
And a plant room often holds more than one boiler.
KT10 and KT7 carry the highest job value on our list, and the reason is what is in the building rather than what it is worth. Houses of this size do not have a boiler in a cupboard. They have a plant room: two or three appliances, one or two large unvented cylinders, underfloor manifolds, and frequently a separate circuit for an annexe, a pool or a garden room.
Where there is more than one boiler they usually run in cascade. They work as a single system, staged, bringing appliances in as demand rises. That is efficient and it has one consequence worth knowing: when one of them fails, the others quietly cover for it. Nothing looks wrong. The house stays warm through autumn and then falls short on the first genuinely cold week, which is precisely when everybody else is calling too.
So a cascade system needs looking at rather than waiting on. A boiler that has been offline for months shows up in the controller long before it shows up in the house, and finding it in October is a different conversation from finding it in January.
A cascade of three smaller boilers is usually more reliable than one large one, because a single failure takes out a third of the output rather than all of it. The trade is that it hides the failure, which is why these systems want checking on a schedule rather than on a symptom.
Which is why one bathroom can go while another stays perfect.
On a stored system, heating that works and hot water that does not points at the cylinder side. The motorised valve that diverts flow to the tank, the cylinder thermostat, or the immersion element. Each costs a fraction of a new appliance.
In a house with two cylinders, each serving its own part of the building, the same fault produces a much more confusing symptom: one wing loses hot water and the rest of the house is unaffected. That is not a boiler fault and it is not a mystery, it is one cylinder circuit out of two, and knowing the layout before we arrive is most of the diagnosis.
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.
On a system this size it does the damage twice.
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. In an Esher or Claygate plant room it lands on the coil inside each cylinder and across every heat exchanger in the cascade, so the same water is working on three or four appliances at once. That is why scale protection and a magnetic filter pay for themselves faster on a large system than anywhere else.
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.
On a cascade the replacement question is almost never all or nothing. Appliances in a cascade fail one at a time and are replaced one at a time, and a controller that has been staging around a dead boiler for six months will do the same around a new one unless somebody looks at the control strategy as well as the hardware.
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.
Next door to here we cover Kingston, Coombe and Surbiton and Richmond and Twickenham. Everything else is on boiler repair in south London and areas we cover.
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.
More than one boiler?
In a cascade the others cover for the one that failed, so nothing looks wrong until a cold snap. Tell us how many there are and we will tell you what to expect.
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.
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.
Usually you do not, and that is the point. In a cascade the remaining appliances cover the shortfall, so the house stays warm until a genuinely cold week exposes the missing capacity. The controller knows long before the house does, which is why these systems are worth checking on a schedule rather than waiting for a symptom.
Very likely one of two cylinder circuits rather than anything wrong with a boiler. Large houses here often run two cylinders, each serving its own part of the building, so a failed valve, thermostat or element takes out one wing and leaves the other untouched.
Because an unvented cylinder is a pressurised store and the work is notifiable. It 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 often turns into two visits from two trades. Our engineers hold both, so it is one visit and one charge.
Yes, and every other major make, including the ones most firms will not touch. Those two and Vaillant are what we see most in cascade plant rooms. Keston appears where flueing is difficult, and Vokera, Biasi, ATAG, Ravenheat and Heatline turn up in annexes and garden rooms. If your boiler is showing a fault code, the brand pages explain what it means.
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 property has no gas supply we cover electric boilers as well.
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.
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.
Every major make, and the fault code pages often name the part before you ring.
Plant rooms specify differently from houses. The cascades we see most here are Worcester Bosch, Vaillant and Viessmann, all three of which make appliances designed to be staged together, and Keston appears often because of how it can be flued in a basement or an outbuilding.
We also work on the makes most firms will not. Vokera, Biasi, ATAG, Ravenheat and Heatline all turn up in annexes, garden rooms and staff flats, where a smaller appliance was the sensible answer. Parts for every one of them are still obtainable.
If your boiler is showing a code, the make decides what it means. A Vaillant F75 and a Worcester Bosch EA are different faults with different fixes, and on a cascade a single code can also mean a staging fault rather than an appliance fault. 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.
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.
Gas Safe registered. Unvented cylinder qualified. Parts guaranteed for a year. Covering London, north and south of the river, 24 hours a day.
