Boiler repair in London
Gas Safe registered engineers for every main make.
Calls answered 24 hours a day
- Calls 24/7
- Gas Safe registered
- Rate in writing
- 12-month guarantee
- All London
Makes we repair
Signs your boiler needs a repair
Four signs bring most people to a repair. Each has a usual cause, and a point where it needs an engineer.
- The taps run coldWhen the boiler gives you no hot water.
- Water around the boilerWhat a leak under or near it usually means.
- Banging, gurgling or whistlingWhat each noise usually points to.
- Cold radiatorsCold at the top, the bottom, or all over.
- It won't lightWhen the boiler tries and stops, or does nothing.
- Something else wrongEvery boiler problem, and what each usually means.
Is my boiler pressure right?
Boiler pressure is right at about 1 to 1.5 bar with the boiler cool, on most makes. It rises a little as the water heats. Read the needle on the boiler's pressure gauge, then check it here.
Check your boiler pressureThree quick questions
Ring us and we'll ask what the gauge reads.Call us now
Your boiler pressure
Ring us: the relief valve is letting water out
A pipe on the outside wall that drips means the pressure relief valve is opening. Either the pressure is getting too high, or the valve itself is worn. That's a job for an engineer.
Too high: ring us
From about 3 bar the pressure relief valve lets water out. An engineer finds why the pressure climbs, most often the expansion vessel or the filling loop.
Ring us: it keeps losing pressure
Topping up once or twice a year is normal. More often usually means water is leaving the system. The cause may be a small leak at a radiator, a valve or a joint. It may also be the relief valve, or an expansion vessel that has lost its charge. An engineer finds where.
Low: top it up
Below 1 bar the boiler will probably stop. With the boiler cool, top it up to about 1 to 1.5 bar as its manual shows, and close the filling valves again afterwards. If the manual doesn't show how, or it drops again, ring us.
That's normal
Most makers ask for about 1 to 1.5 bar with the boiler cool. The pressure rises as the water heats, so about 1.5 bar or more while the heating runs is normal.
A little high
That's above the 1 to 1.5 bar most makers ask for with the boiler cool. Check the filling loop's valves are fully closed. Bleeding a radiator brings the pressure down. If it creeps up again, ring us.
Too high
Above about 2.5 bar with the boiler cool is too high. Check the filling loop's valves are fully closed and bleed a radiator to bring it down. If it stays high or comes back, ring us: the expansion vessel or the filling loop needs an engineer.
High while it's warm
The pressure rises as the water heats, so let the boiler cool and read the gauge again. Ring us if it's still above about 2.5 bar, or if it climbs by more than about 1 bar as the heating warms up. The expansion vessel may need recharging, which is an engineer's job.
Pressure problems, fixed
Boiler losing pressure? We find the leak.
- Leaks found and fixed
- Relief valves and expansion vessels
- Calls answered 24 hours a day
Topping up, as the makers' manuals show it:
- the F22 fault code page, for a Vaillant or Glow-worm
- the E119 fault code page, for a Baxi or Potterton
Sources: the makers' manuals and help pages, from Ideal, Baxi, Vaillant, Worcester Bosch and Viessmann.
How the repair visit goes
Three stages, and the rate is agreed before the repair starts.
1. Before anything is touched
The engineer covers the floor around the boiler and asks what you have seen and heard since you rang.
2. Finding the fault
The engineer tells you which part has failed, whether they have it with them or must order it, and how long the work should take. No work is done until the rate is agreed in writing and you say yes.
3. The repair
The engineer fits the part and checks the boiler runs as it should before leaving. The repair is guaranteed for 12 months, covering the parts we fit, the labour and any return visit.
Our recent work
See it full sizePutney, SW15: the boiler's front off, a dust sheet down and the tools laid out 
See it full sizeThe boiler opened up: the fan, the gas valve and the flue duct, the control panel lowered 
See it full sizeInside the boiler: the pump and its pressure relief valve, with the red cap 
See it full sizeInside the boiler's case, beside the flue 
See it full sizeThe bathroom radiator off its brackets, the flushing hoses on its two valves 
See it full sizeThe power flushing machine in the next room, its hoses running to the bathroom 
See it full sizeThe Kamco Clearflow running, two radiators off and leaning on the wall 
See it full sizeThe front room's radiator off too, the hoses on its valves under the window 
See it full sizeThe machine up close: its pump, its valves and the hose that fills it 
See it full sizeThe machine's magnetic filter, with the system cleaner and the inhibitor 
See it full sizeThe machine and its filter in the front room, the cleaner and inhibitor ready 
See it full sizeThe boiler's front back on: an Ideal Logic+ combi 
See it full sizeRunning again: hot water ready, and the heating on at 56°C Need a power flush?
See it full sizeFront case off and the control panel lowered, to see inside 
See it full sizeA multimeter and tools laid out by the boiler 
See it full sizeFlushing hoses run in through the cupboard door 
See it full sizeThe hoses connected under the boiler, its controls wrapped against water 
See it full sizeThe power flushing machine set up outside, on a drip tray 
See it full sizeThe machine's hoses run back to the heating system 
See it full sizeThe machine's pump and filters, close up 
See it full sizeTools, and the system cleaner that goes in with the flush 
See it full sizeThe boiler's body lifted off its frame on the wall 
See it full sizeThe boiler's body out on the patio, after dark 
See it full sizeThe boiler's plate heat exchanger, which heats the hot water on a combi 
See it full sizeWorking on the fan, at the top of the boiler 
See it full sizeThe new fan, left, beside the old one 
See it full sizeThe new fan, ready to go in Boiler playing up?
See it full sizeThe flushing hose connected at the boiler's pipes 
See it full sizeA boiler with a built-in hot water store, its case off 
See it full sizeThe flushing hoses connected under the boiler 
See it full sizeThe power flushing machine set up indoors, on sheets and a drip tray 
See it full sizeThe system cleaner and the inhibitor that go in with the flush 
See it full sizeThe machine's filters, close up 
See it full sizeThe underfloor heating's manifold, on the same system 
See it full sizeThe boiler's control board, its cover off Need a power flush?
The makes we repair
Every main make, combi, system and regular. Pick yours for its common faults, its codes and how we repair it.
We also repair Saunier Duval, Daikin, Immergas, Chaffoteaux and Ocean boilers.
Every make we repair, by type: current, older and discontinued.
An electric boiler that has stopped: the safe checks, each make's lights and codes, and the repair.
What changes the price of the repair
A repair's price depends on the part it needs, how long the job takes, the time of day and the season.
The rate is agreed on the call, before an engineer comes. Nights and weekends cost more, and we'll tell you the rate when you ring.
Once the engineer has found the fault, they tell you what the repair will cost, and nothing is done without your yes. If you decide not to go ahead, you pay just for the diagnosis, at the rate agreed on the call.
Repair or replace: when a repair isn't the answer
Sometimes the part a boiler needs costs a large share of a new one, or the same fault keeps coming back. Then the engineer says so, and gives you the rate for the repair to weigh against a new boiler. The choice is yours, and a repair is never refused because a new boiler would cost more. Ring us for a new boiler quote: the survey visit is free.
15% off a new boiler, fitted
The 15% comes off the price of a new boiler installation. We quote from photos of your old boiler, or after a free survey visit. Now is the time to replace an old or discontinued boiler.
Terms: 15% off everything in the price we quote for a new boiler installation. That means the boiler, its flue and controls, and the fitting. The offer is for installations booked by 31 December 2026. One offer per home, and not with any other offer.
Do you cover my part of London?
Yes: we repair boilers all over Greater London, day and night, in every borough north and south of the Thames. Pick your side of the river to see the areas.
North of the river
Every borough north of the Thames: Barnet and Enfield at the top, Hillingdon in the west, Havering in the east, and central London in between.
South of the river
Every borough south of the Thames: Richmond and Kingston in the west, Bexley in the east, and down through Croydon to Sutton and Bromley.
Questions about repairs
How long does a boiler repair take?
How long a boiler repair takes depends on the fault and on whether the part is on hand. Once the engineer has found the fault, they tell you how long the repair should take, before the rate is agreed.
Do you repair combi boilers?
Yes. We repair combi, system and regular boilers, on every main make. How the three types differ.
Is an old boiler worth repairing?
Often, yes: age alone doesn't decide it. What decides it is the rate for the repair against a new boiler, and how often the boiler has failed. The engineer gives you the rate for the repair, and the choice is yours.
What does a boiler repair cost?
The cost of a repair depends on the part, how long the job takes, the time of day and the season. The rate is agreed on the call, before an engineer comes, and nights and weekends cost more. If you decide not to go ahead after the engineer has found the fault, you pay just for the diagnosis. What changes the price.
There's a code on the display: what now?
Note the code and the make of boiler: we'll ask for both when you ring. What each code means, make by make.
Don't know what has failed? You don't have to.Ring and say what you can see or hear. Finding the fault is our job.
Calls answered 24 hours a day
A real person answers and gives you the rate on the call. No work starts until you say yes, and repairs are guaranteed for 12 months: parts, labour and any return visit.
