Boiler repair in Harrow
Many 1930s semis in Harrow have a loft conversion bathroom, fed by a system never meant to reach that high. Weak pressure there is normally down to the system rather than the boiler, and we will tell you that instead of selling you a replacement.
- Fully insured and Gas Safe registered
- Engineers are DBS-checked
- 24/7 emergency callouts
- Price agreed before any work begins
- Workmanship guaranteed
Monday – Sunday, 7:00 AM – 10:00 PM · Out-of-hours emergency? Call 020 3576 5825
Boiler repair in Harrow
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Boiler repair in Harrow
- Bathrooms in loft conversions beyond the reach of the system’s pressure
- A second or third heating system still running on the original pipe routes
- Immersion heaters and cylinders tucked into airing cupboards
Most Harrow semis were built with an airing-cupboard cylinder on the landing fed from a tank in the roof space, and a good number still work that way, now with a regular or system boiler in the kitchen or garage. When a loft conversion goes in, that loft tank is often moved or shrunk to make room, which can leave the system prone to airlocks and to water pumping over into the tank. Houses that switched to a combi at the same time have a different weak point: surviving galvanised mains pipe that restricts flow into the boiler, so hot water comes through weak or lukewarm. Boilers in garages are common here too, and their condensate pipe needs protecting, because an unheated garage freezes well before the house does. Driveways make access easy in most of HA1 to HA5; the loft hatch is usually the tight part of the visit.
The full scope of our boiler repair work
- Tracing faults and diagnosing breakdowns
- Boilers showing a fault code and locked out
- Loss of heating or hot water
- Faults on radiators and central heating
- Heating controls and thermostats
- Boilers that lose pressure and need constant refilling
We work throughout Harrow, taking in HA1, HA2, HA3, HA5. The local building stock largely explains which faults turn up: see our full Harrow plumbing page →
Questions we often get
Do you work in Harrow?
We do. Harrow falls within Harrow, covering the HA1, HA2, HA3, HA5 postcodes, and our engineers are out across Greater London from our Fulham office every day.
Would a new boiler cure the weak shower in our loft conversion?
In most cases, no. How much pressure you get that high up depends on the type of system, and the fix is often a pump or a different setup rather than a larger boiler. We would sooner say so than sell you a boiler that leaves the problem in place.
Since the loft conversion the pump in the airing cupboard is noisy. Is the boiler failing?
Unlikely. Noise or gurgling after a loft conversion usually means air in the system, often because the small feed and expansion tank was moved or lowered during the building work. It is a common story in Harrow semis on a vented setup. We check the tank height, bleed the system and look at the pump speed. The boiler itself is usually fine, and we will say so rather than quote for a new one.
How much will it cost?
Before an engineer starts, you are given a price for the job. Should something hidden in a wall change what is needed, we stop and discuss it with you first, instead of pressing on and sending the bill later.
Other jobs we cover nearby
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Emergency plumber in Harrow
For burst pipes, serious leaks or a house with no water. The phone is answered at any hour and an engineer is sent out.
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Bathroom installation in Harrow
Anything from swapping one fitting to stripping out and refitting the whole room, priced before work starts.
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Boiler service in Harrow
A yearly check to keep your boiler safe, running efficiently and covered by its warranty.
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Boiler installation in Harrow
Your new boiler, matched to the size of the home, installed well, at a price agreed up front.
Boiler repair: other areas we cover
Boiler repair in Harrow
Send us your postcode with a short note on what has gone wrong, and you’ll know the cost before anyone turns up at your door.