Combi boiler service
Full yearly service for combis, with hot water flow and scale checks for London's hard water.
See the serviceBoiler servicing across south and west London
Boiler service in London, booked on a day that suits you
Yearly boiler services, landlord gas safety records and repairs for homes from Clapham to Croydon and Ealing to Greenwich. Tell us your boiler make and age, pick a day, and we confirm the visit.
Warm all winter.
Photo for illustration
South / west London
- Yearly boiler services
- Landlord gas safety records
- Filter clean and system check
- South and west London
A yearly boiler service, done properly
For a boiler service in London, book a Gas Safe registered engineer once a year, ideally in spring or summer before the autumn rush. A full service checks the gas pressure, burner, flue, seals and combustion, and records it for your manufacturer warranty. Landlords also need a yearly gas safety record, often called a CP12.
London Boiler Servicing looks after gas boilers in houses and flats across south and west London. A service is not a quick look. The engineer takes the case off, cleans and checks the parts that wear, tests what the boiler is burning and breathing out, and writes it all down so you have a record.
Which visit do I need?- 01
Hard water everywhere we cover
Thames Water says all the water in its region is hard because it passes through chalk and limestone. In a combi boiler that scale builds up in the hot water heat exchanger, so a service in London should always include a look at hot water flow and temperature.
- 02
Boilers squeezed into flats
Victorian houses in Clapham, Brixton, Fulham and Brockley were split into flats, and the boiler often ended up in a kitchen cupboard, a hall cupboard or the loft. We ask where yours is when you book, so the visit is planned for the access you have.
- 03
Hidden flues in newer blocks
Many flats built since 2000 along the river and in town centres have the boiler flue running through ceiling voids. Since 2013 an engineer who cannot see the flue must treat the boiler as at risk, so inspection hatches matter at service time.
Junabout 390 searches
The quiet months.
The best time to book.
Searches for a boiler service in London fall to about 390 a month in May and June. The heating is off, there is more choice of days, and anything the engineer finds has time to be put right.
Monthly Google searches for a boiler service in London, Google Keyword Planner
Three ways to book.
One proper service.
Pick the visit that fits your home. The engineer confirms the price and what your boiler needs when you book.
For your own home01
Annual service
A full yearly service with a combustion test and a written record you can keep for your warranty.
- Combustion test
- Written record
PriceConfirmed when you book
See the serviceFor landlordsCP12 included
Landlord service
The yearly landlord gas safety check and record, with a full boiler service at the same visit if you want it.
- Gas safety record
- Service same visit
PriceConfirmed when you book
See the serviceService plus03
Service plus
Filter clean, water test and radiator check to show whether your system needs a clean, a flush or nothing more.
- Filter clean
- Water test
PriceConfirmed when you book
See the servicePhotos for illustration. Every boiler is different, so the visit and the price are confirmed with you before the engineer arrives.
Everything else we look after
System and regular boiler service
Yearly service for system and heat only boilers, including pumps, valves and hot water cylinder checks.
See the service
Boiler breakdown and repair
Fault finding and repair for gas boilers that have stopped, lock out, leak or show a fault code.
See the serviceBoilers we service
Servicing for the main makes, with a record that matches what each maker asks for to keep the warranty valid.
See the service
Boiler service price guide
What a service costs, what pushes the price up or down, and how to compare quotes fairly.
See the service
Boiler service plans explained
Plans, cover or pay each year: what you actually get and the questions to ask before signing.
See the serviceWhich boiler is
on your wall?
Photo for illustrationNo tank. Hot water straight from the mains.
Full yearly service for combis, with hot water flow and scale checks for London's hard water.
Hot water flow and scale checked
Photo for illustrationA cylinder in the cupboard, maybe tanks in the loft.
Yearly service for system and heat only boilers, including pumps, valves and hot water cylinder checks.
Pump, valves and cylinder checked
Photo for illustrationWorcester Bosch, Vaillant, Baxi, Ideal and more.
Servicing for the main makes, with a record that matches what each maker asks for to keep the warranty valid.
A record that matches what the maker asks for
All checked.
Down to the detail.
A service is not a quick look. Tap a number to see what the engineer checks on a gas boiler.
Drawing for illustration
The way out for fumes.
Checked along its route and at the terminal outside, with the seals around it, so fumes leave the house the way they should.
The parts that wear.
Case off, burner and heat exchanger inspected and cleaned where needed, then a combustion test with a flue gas analyser.
The right amount of gas.
Gas pressure and supply checked at the boiler, so it burns cleanly and the safety devices do their job.
The drain nobody sees.
The condensate trap cleaned out so the boiler can drain. A blocked or frozen trap is a common reason for a lockout.
South and west London areas we cover
From Battersea, Clapham and Brixton out to Croydon and Bromley, and west to Fulham and Ealing.
12 areas.
One booking form.
How a booking works
Book my service- 01
Tell us about your boiler
Give the make, rough age, when it was last serviced and whether you need a landlord gas safety record. A photo of the boiler front and its data badge helps.
- 02
Pick a day
Choose a preferred day and we confirm a time window. Landlords can give tenant contact details and we arrange access with them.
- 03
The service visit
Gas work in the UK must be done by a Gas Safe registered engineer, so ask to see the ID card on arrival. The engineer then checks the boiler and flue, cleans what needs cleaning and runs a combustion test with a flue gas analyser.
- 04
Your record
You get a written service record, with the Benchmark section filled in where the boiler has one. Landlords get the gas safety record to pass to tenants. Any faults are explained in plain words with a quote before any work.
Good to know
before the visit.
All advice Good questions.
Clear answers.
Still not sure what your boiler needs?
Ask, and get a straight answer.
How often should a boiler be serviced?
Once a year. Boiler makers such as Worcester Bosch and Vaillant make a yearly service a condition of their guarantee, and the yearly gas safety check is a legal duty for landlords. Owner occupiers are not forced by law, but a yearly check is how faults and carbon monoxide risks get caught early.
How much does a boiler service cost in London?
We confirm the price when you book, once we know the boiler type and what you need. For a guide, Checkatrade's 2026 cost guide puts a one off gas boiler service at £80 to £120 across the UK. A service with a landlord gas safety record, or extra appliances such as a gas hob or fire, takes longer.
How long does a boiler service take?
Most services take around an hour once the engineer can reach the boiler. Tight cupboards, loft boilers, a regular boiler with a cylinder, or a landlord check covering several appliances can take longer. We ask about access when you book so the time is planned in.
What does a boiler service include?
The engineer checks the gas pressure and supply, removes the case, inspects and cleans the burner, heat exchanger and condensate trap, checks seals and the flue, and runs a combustion test. They also check controls and safety devices, then write up a service record.
Is a gas safety certificate the same as a boiler service?
No. A landlord gas safety check confirms each gas appliance and flue is safe to use. A service goes further, cleaning and adjusting the boiler so it keeps working well. Many landlords book both at the same visit.
Will a missed service void my boiler warranty?
It can. Worcester Bosch says yearly servicing must be completed each year to keep the guarantee valid, and Vaillant says the boiler must be serviced annually. Terms vary by maker and model, so check your guarantee certificate and book as soon as you notice a service is due.
Can I have my heating on before the boiler is serviced?
Yes, if the boiler is working normally and there are no warning signs. If you see yellow or floppy flames, soot marks, a pilot light that keeps going out, or a carbon monoxide alarm sounding, turn it off and get it checked first.
How do I know the engineer is Gas Safe registered?
Ask to see their Gas Safe ID card. It shows a photo and licence number, and the back lists the types of gas work they are qualified to do. You can check the number on the Gas Safe Register website before the visit.
Safety first
If you smell gas or suspect carbon monoxide
- 01
Call the National Gas Emergency Service on 0800 111 999 straight away. It is free and open all day, every day.
- 02
Turn off the gas at the meter if you can reach it safely. The lever is usually beside the meter, turn it so it sits across the pipe.
- 03
Open doors and windows to let air in.
- 04
Do not use light switches, plugs, doorbells or anything that could spark, and do not smoke or light a flame.
- 05
If anyone has headaches, dizziness or sickness that ease when they go outside, leave the property and get medical advice. These can be signs of carbon monoxide.
- 06
Do not use the boiler again until a Gas Safe registered engineer has checked it.
Book your
boiler service
Tell us your boiler make, age and preferred day, and we will confirm the visit.
Start booking The price is confirmed when you book.Your boiler. Your booking.
A few taps about your boiler, a day that suits you, then your details. Not sure is a perfectly good answer.
- 01Your boiler
- 02The visit
- 03Your details
Step 1
Your boiler
Who made your boiler?
The name is usually on the front panel.
Your boiler
What type is it?
Your boiler
Roughly how old is it?
Your boiler
When was it last serviced?
The visit
Do you need a landlord gas safety record (CP12)?
Landlords must have every gas appliance checked each year and give tenants a copy.
The visit
Which day suits you?
The visit
What is the postcode?
So the right engineer for your area picks it up.
Your details
Ready to book
The engineer will confirm the day and the price when they reply. Have the boiler make and model to hand if you can: it is on the front or underneath.