Boiler service in London
Your yearly boiler service. Ring us for the rate.
Do I need a boiler service?Tick what applies to your boiler
Tick everything that applies
Tick at least one, or ring us and we'll ask about your boiler.
Not sure? Ring us and we'll ask about your boiler.Call us now
It needs a repair, not a service
A service checks and cleans a boiler that works. One that has stopped, leaks, keeps cutting out or shows a fault code needs a repair. The engineer finds the fault, and the rate is agreed in writing before the repair starts.
You need a gas safety check as well
A landlord must have each gas appliance checked by a Gas Safe registered engineer every 12 months, and a boiler service doesn't replace that check. We carry out both, and we'll ask what's due when you ring.
The boiler's yearly service is due too, by what you've ticked.
Yes: it's time for a service
Boiler makers recommend a service once a year, and most make a yearly service a condition of their guarantee. A straightforward service takes between half an hour and an hour.
Not yet: book the next one before the year is up
Makers recommend a service once a year, so a boiler serviced in the last 12 months that works well isn't due yet. Keep the record of each service with the boiler's papers: the maker can ask to see it.
What you ticked means
- It hasn't been serviced for over a year: Boiler makers recommend a service once a year.
- I don't know when it was last serviced: If you have moved in and don't know when it was last serviced, book one.
- It's still under the maker's guarantee: Most makers make a yearly service a condition of their guarantee. Miss one, and a repair it would have paid for may not be covered.
- I want it ready for the winter: Vaillant suggests a service in the summer, so the boiler is ready for the winter.
- I let the home out: The yearly gas safety check is a separate legal duty for a landlord, and a service doesn't replace it.
- It has stopped working: A service checks and cleans a boiler that works. A boiler that has stopped needs a repair.
- It leaks or keeps cutting out: A boiler that leaks or keeps cutting out needs a repair, not a service.
- It shows a fault code: A fault code points to a fault, so the boiler needs a repair.
- It was serviced in the last year and works well: A yearly service keeps it up to date. Book the next one before the year is up.
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Makes we repair
When your boiler is due a service
Boiler makers recommend a service once a year, and most make it a condition of their guarantee. Book one if:
- it has been more than a year
- you have moved in, and don't know when the boiler was last serviced
The summer is a good time, so the boiler is ready for the winter.
How often a boiler needs a service, and what the law says.
If you let a home, the yearly gas safety check is a separate legal duty. Gas safety checks and certificates for landlords.
Sources: the boiler makers' guarantee terms, such as Worcester Bosch's, and Vaillant for the summer.
What a boiler service includes
A service follows the boiler maker's own instructions. It usually covers these checks, in this order.
A service is a good time to ask about having a smart thermostat fitted.
How long a boiler service takes
A straightforward service takes between half an hour and an hour. It takes longer if a part needs a thorough clean, or if the engineer finds a fault.
Someone needs to be at home to let the engineer in, and to hear what they found.
Sources: Baxi and Vaillant.
Servicing and your boiler warranty
Most boiler makers make a yearly service a condition of their guarantee. Worcester Bosch, for one, needs the service done each year by a Gas Safe registered engineer to keep its guarantee valid. Miss one, and a repair the guarantee would have paid for may not be covered.
Keep the record of each service with the boiler's papers: the maker can ask to see it.
Hard water, limescale and scale reducers
Most of London's water is hard. Thames Water's region takes in most of London, and all its water is hard. That means 200 to 300 milligrams of calcium carbonate a litre. Hardness comes from calcium and magnesium dissolved in the water.
Hard water leaves scale on heating elements, which shortens an appliance's life and makes it less efficient. At a service the engineer can see the signs of scale inside the boiler.
A scale reducer is a fitting meant to slow that build-up. Magnetic ones are made for the steady flow of industry, and there is little sound evidence that they work in a home. Ask the engineer what yours is, and whether it is doing its job.
Sources: Thames Water and the Drinking Water Inspectorate.
What changes the price of a service
The rate for a boiler service is given on the call, before the visit is booked. Ring us on 020 8064 0067, or book online and we'll give you the rate when we ring you back.
Boiler cover with a yearly service, or paying as you go: how they compare.
When a service won't fix the problem
A service checks and cleans a boiler that works. Your boiler needs a repair instead if it:
- has stopped
- leaks
- keeps cutting out
- shows a fault code
The engineer finds the fault, and the rate is agreed in writing before the repair starts.
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 service 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 boiler servicing
How often does a boiler need a service?
Once a year. Makers recommend it, and most make it a condition of their guarantee. How often, and what the law says.
Does a service include a gas safety check?
No. A service keeps the boiler working well. A gas safety check is the yearly safety inspection a landlord needs by law. Gas safety checks and certificates.
How much is a boiler service?
The rate for a boiler service is given on the call. Ring us on 020 8064 0067 and we'll give you the rate before the visit is booked. What changes the price.
Do I need to be at home?
Yes. Someone needs to be in to let the engineer in, and to hear what they found.
Can you service my make of boiler?
Yes: every main make, combi, system and regular, including Vaillant, Worcester Bosch, Baxi and Ideal.
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.
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A real person answers and gives you the rate on the call. No work starts until you say yes.
