Heating engineers in London
Most heating trouble in a London home comes down to a short list: a boiler that has stopped, a system clogged with sludge, a cylinder that no longer heats the water, or a property that was never properly heated at all. Our heating engineers deal with every one of them. Anything involving gas is handled by Gas Safe registered staff, all directly employed, DBS-checked and fully insured. Pick what is happening at home from the list below, or ring us, describe it, and we will work it out together.
- Gas Safe registered and fully insured
- DBS-checked engineers
- Emergency callout available 24/7
- Price agreed before work starts
- Workmanship guaranteed
Monday – Sunday, 7:00 AM – 10:00 PM · Out-of-hours emergency? Call 020 3576 5825
Tell us about the heating problem
Three details get an engineer moving. The rest is optional.
Thanks — we’ve got it
We’ll come back to you on the number you gave us. If it’s urgent and you’d rather not wait, call 020 3576 5825.
What's happening?
Pick the closest match and go straight to the page that deals with it.
- No heating, but the hot water still works Often a valve, pump or controls fault. Fault codes and lost pressure too.
- Radiators warm at the top, cold along the bottom Sludge has settled inside. A flush shifts it; bleeding will not.
- An ageing boiler that keeps breaking down An honest repair-or-replace answer, with both costs side by side.
- Nothing is wrong, but the boiler is due its yearly check Catches worn parts before winter and keeps warranty conditions met.
- Moving the boiler, or swapping a tank system for a combi Type, size and position settled before anything is ordered.
- Water from the cylinder is cold or only lukewarm Often the immersion element or a thermostat, not the cylinder itself.
- Storage heaters, or no central heating at all A complete wet system, planned room by room.
- An extension is going on and you want warm floors Underfloor heating is easiest to fit while the floor is being laid.
Everything under heating
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Boiler repair
For a boiler that has stopped, locked out or keeps losing pressure. We find the fault first, then quote repair and replacement side by side.
More on boiler repair -
Boiler service
The yearly inspection and clean, flue and combustion included. It spots wearing parts early and gives you the record most warranties depend on.
More on boiler service -
Boiler installation
A first boiler, a change of type, or an existing one moved somewhere better. Sized for the property, not copied from whatever was there.
More on boiler installation -
Boiler replacement
When the current boiler may have reached the end. A straight view on whether it really has, and on what should replace it.
More on boiler replacement -
Central heating installation
The whole system, not just the boiler: pipework, radiators and controls, including first-time heating in homes that have never had any.
More on central heating installation -
Radiators and power flushing
Radiators fitted, moved or taken off for decorating, and sludged systems power flushed, with a magnetic filter added to keep the water clean.
More on radiators and power flushing -
Underfloor heating
Wet underfloor heating fed from your boiler or heat pump, best fitted during an extension or refit. Cold loops tested and repaired.
More on underfloor heating -
Hot water cylinders
Vented and unvented cylinders replaced and sized to how many showers run at once, plus yearly servicing of unvented systems and their safety valves.
More on hot water cylinders -
Immersion heaters
The electric element inside the cylinder. Failed elements and thermostats tested and replaced, often the whole story behind no hot water.
More on immersion heaters -
Boiler brands we work on
Worcester Bosch, Vaillant, Ideal, Baxi and more. What we tend to find on each make, and which we install as well as repair.
More on boiler brands we work on
What our heating engineers cover
Our heating services run from one stuck radiator valve to a complete new system: boiler breakdowns and annual services, new and replacement boilers, radiators fitted, moved and flushed, cylinders and immersion heaters, wet underfloor heating, and the controls that run it all. We work on combis, system boilers and heat-only boilers, sealed or open-vented. The first thing we ask is which you have, because a combi in a flat and a house with a cylinder in the airing cupboard go wrong in quite different ways. A photo of the boiler and the airing cupboard usually settles it.
How a heating visit works
If the boiler shows a fault code, photograph the display and the make and model label when you get in touch, because that often tells the engineer which part to bring. Out of hours, the booking number goes through to our 24/7 emergency callout. When the engineer arrives, ask to see their Gas Safe ID card. They find the fault before replacing anything, explain it in plain terms and agree a price with you before starting. If a part has to be ordered in, you are told there and then. We take card and cash.
Heating in older London homes
Much of London was built long before central heating, and it shows. In Victorian and Edwardian terraces the system was usually added decades later, with pipes threaded under floorboards and radiators put wherever they fitted. Many still run open-vented, with a feed-and-expansion tank in the loft. Systems from the 1970s often used microbore, thin 8mm or 10mm pipe that clogs readily once sludge builds up. London’s hard water adds limescale to combi heat exchangers, cylinder coils and immersion elements. In a converted flat, a new flue through an outside wall may need the freeholder’s consent under your lease.
What affects the price
Two heating jobs with the same name can differ a lot underneath, so there is no price list, but the things that push a price up or down are predictable. For a repair: which part has failed, whether it is on the van, and how easy the boiler is to reach, since one boxed in behind kitchen units or up in a loft takes longer. For an installation: the type and size of boiler, whether it moves, how far the flue and pipework run, how many radiators are involved, and whether the system needs cleaning first. Out-of-hours callouts, parking and access count too. You agree the price before anything starts.
Gas Safe, and the legal side
By law, anyone paid to work on gas appliances or gas pipework has to be registered with Gas Safe. Ask to see the ID card and turn it over: the back lists the gas work that engineer is qualified to do. A new boiler must be notified to building control, which the Gas Safe installer does for you, and a compliance certificate follows; keep it for when you sell. Landlords need a gas safety check every twelve months, and in England a rented home needs a carbon monoxide alarm in any room with a fixed combustion appliance other than a gas cooker. If you smell gas, your first call should be to the National Gas Emergency Service (0800 111 999), not to us.
Common questions
Is a heating engineer different from a plumber?
They overlap, but gas is the dividing line. Anyone paid to work on a boiler or gas pipework must be Gas Safe registered, and a plumber without that cannot touch the gas side. We do both.
Do you work on every make of boiler?
Yes. Gas Safe registration covers gas boilers of any make, so the badge does not limit who can repair it. What varies between brands is how easily parts can be found.
The heating has failed at night. Will you come out?
Yes, emergency callout runs 24/7. Call if there is no heat in cold weather with someone vulnerable at home, or water leaking from the system. If it can safely wait, we will book an ordinary appointment instead.
Should I bleed the radiators before calling you?
If one is cold at the top and warm lower down, yes: that is trapped air. Check the boiler pressure afterwards, as bleeding a sealed system lowers it. A cool bottom edge points to sludge, which bleeding cannot shift.
Do you work for landlords and letting agents?
Yes: yearly gas safety checks and certificates, boiler services and repairs in tenanted homes, with several properties booked together if that helps. Tell us who holds the keys and where the paperwork should go.
Is there a call-out charge, and how can I pay?
Yes, a call-out charge applies, and the price of the work is agreed before anything starts. New to us? You get £25 off that first call-out, though not alongside any other offer. We take card and cash.
Heating advice from our engineers
Boiler Pressure Low? How to Top It Up and Why It Keeps Dropping
Topping up takes a few minutes. Working out why the pressure keeps falling is what stops it happening again.
No Hot Water? What to Check, Even When the Boiler Is Working
Cold taps rarely mean the boiler is finished. Here are the checks to do first, and what it points to when the heating still works but the hot water does not.
Is a Water Softener Worth It in a London Home?
Most of London sits on hard water, and the limescale it leaves behind costs more than most people realise over a few years.
Tell us what the heating is doing
Call 020 3576 5825, or WhatsApp +44 7447 575645 with a photo of the boiler. We answer from 7am to 10pm daily, and emergency callout runs around the clock. Not sure which job you need? Describe the symptoms and we will work it out with you.