Gas engineer and heating services in London

Smell gas? Call 0800 111 999 first

That is the National Gas Emergency Service, free and open day and night. Turn off the gas at the meter if you can, open doors and windows, keep away from light switches and flames, and get everyone outside. Once the supply is made safe, our engineers can repair the appliance.

Call 0800 111 999

Call us now if

There is no heating or hot water and someone at home is elderly, unwell or very young
Water is leaking from the boiler or the pipes under it
A tenant has no heating and you are the landlord
The boiler keeps locking out after a reset

Call 0800 689 3497

Book a visit if

The yearly service or the landlord gas check is due
Radiators stay cold in places or the boiler has got noisy
You top up the pressure more than once a month
You are weighing up a new boiler

Request a callback

A gas engineer who looks at the whole system

A boiler is one part of a heating system. The pipework, radiators, valves, pump and controls all have to work with it, and a fault in any of them can look like a boiler fault.

Our engineers test the system before they condemn a part, so you pay for the repair it needs rather than a guess. When a boiler is past saving, you hear that straight, with the reasons.

Gas work is only carried out by Gas Safe registered engineers, and the paperwork, from a service record to a landlord certificate, comes with the visit.

FS Group plumber working on pipework at ceiling height

Heating and gas services we carry out in London

From a boiler that will not fire to the yearly landlord check, tell the help desk what is happening and they will book an engineer with the right parts.

Boiler repair

No heating, no hot water, low pressure, leaks and fault codes on gas boilers.

Boiler servicing

A yearly service that keeps the boiler safe, efficient and covered by its warranty.

Landlord gas safety certificates

The annual gas safety check and record (CP12) that every rented home needs.

Boiler installation

Replacement and new boilers chosen for the size of the home and its hot water use, plus commercial installs.

Central heating and radiators

Cold radiators, sludge and powerflushing, valves, pumps and heating controls.

Air conditioning and heat pumps

Air conditioning fitted and serviced, and air source heat pumps installed.

Boiler stopped? Five checks before you call

Some stoppages are not faults at all. These take a few minutes and need no tools, and anything past them is a job for a gas engineer.

Look at the pressure gauge. Most combi boilers sit between 1 and 1.5 bar when cold, and many lock out below that. The boiler manual shows how to top it up through the filling loop.
Note any fault code on the display. Write it down before you reset anything. It tells the engineer where to start and can save a second visit.
Try one reset, not five. If the boiler locks out again, leave it off. Resetting it over and over can hide a fault that needs fixing.
Check the thermostat and timer. Flat batteries in a wireless thermostat, or a timer an hour out after the clocks change, are common reasons for no heating.
In a freeze, check the condensate pipe. The thin plastic pipe that runs outside from a condensing boiler can freeze solid. Pouring warm, not boiling, water along it often clears it.

Never take the casing off a gas boiler. Only a Gas Safe registered engineer should work inside a gas appliance.

Landlord gas safety certificates

If you let a home with gas appliances, the Gas Safety (Installation and Use) Regulations 1998 set out three duties. Our engineers carry out the check and write up the record in the same visit.

12months at most between checks on every gas appliance, flue and fitting you provide

28days to give existing tenants a copy of the record; new tenants get one before they move in

2years to keep each record

Managing several properties? A Priority Account gives you one named contact and contract pricing across all of them.

Set up a Priority Account

FS Group gas engineer working on a wall-hung boiler

Service, repair or replace?

Three different visits, and the engineer will tell you which one your boiler needs.

Once a year

Service

The engineer checks the boiler burns gas safely, tests the flue and the safety devices, cleans what needs cleaning and records the visit. Most manufacturers ask for a yearly service to keep the warranty valid.

When it fails

Repair

Most breakdowns come down to one part: a pump, a fan, a diverter valve, a sensor or the circuit board. The engineer finds which one before anything is ordered.

When repair stops making sense

Replace

Repeated breakdowns, parts that are no longer made, or a repair quote close to the price of a new boiler. You get both prices, and the choice stays yours.

Why customers call us back

A few of our Google reviews, as customers wrote them.

Phillip B.★★★★★

Friday evening call-out

What a class act. Superb professionalism, fantastic technical knowledge, super courteous - I'd use the team again in a heartbeat; and all this on a 17:00 job on a Friday. Well played.

Sophie G.★★★★★

Bank holiday call-out

Top service on a bank holiday. Fast, efficient, very polite and fairly priced. Would definitely recommend.

Richard L.★★★★★

Early morning call-out

Great service - called at 7am, had someone here within 45 minutes, issue sorted quickly. Reasonable price too.

Diana B.★★★★★

Clear charges

Prompt and professional service with a good level of expertise. Clear and friendly communication both from the engineer and switchboard. Clarity of charges. The problem was resolved.

Matt T.★★★★★

Job explained

Josh was incredibly efficient and had a good attention to detail. He also was patient enough to explain all of the things that he was going. Call out was very quick also.

Kelly L.★★★★★

Price as expected

Fantastic service. Punctual, polite (Mitch) - solved the problem in under an hour and was very clear on pricing which was exactly what I expected - no nasty surprises. Highly recommend and will be keeping their number!

Naheed B.★★★★★

Same-day visit

Called FS Group in the morning, they had an engineer out to me the same day and fixed the issues. Very happy with the service provided and would definitely use them again.

Brian A.★★★★★

Quoted by phone

Same day service. Price was excellent and as quoted over phone. (Cheapest of 4 quotes). Work was carried out very professionally by very well mannered staff. I would DEFINITELY recommend

Christine D★★★★★

Job explained

Polite, Friendly, Professional two person team led by Josh (assisted by Theo)
They got on with their work and answered questions so that we knew exactly what process was being carried out at any given time.

Great Service.

Thanks

Philippa D.★★★★★

Arrival time

James arrived after a headsup of timing. Did the job very efficiently and left everything very clean and tidy. High recommendation

Donald P.★★★★★

Repeat customer

Always a pleasure doing business with FS Group. Communications are always very good, they are punctual, professional, efficient and staff attending are always friendly and helpful. Five stars!

Sean S.★★★★★

Business customer

FS are a fantastic reliable company who never let us down! We have been relying on their services for quite some time and we’re always confident when recommending them to customers. All of their engineers are reliable, efficient and honest.

Keep your heating running between visits

Four small habits that keep a heating system healthy and can save a call-out.

Bleed radiators that are cold at the top

Trapped air stops hot water reaching the top of the radiator. With the heating off, open the bleed valve with a radiator key until water appears, then check the boiler pressure.

Run the heating in summer

Turning it on for 15 minutes once a month keeps the pump and valves from seizing after months standing still.

Test the carbon monoxide alarm

Press the test button once a month, and replace the alarm by the end-of-life date printed on it.

Keep the flue and vents clear

Do not box in the boiler, cover its vents or let plants grow over the flue outside. It needs air to burn gas safely.

Frequently asked questions

How quickly can a gas engineer get to me?

A breakdown call gets an engineer to you within two hours wherever we can, day or night, subject to availability. Boiler services and landlord checks are booked for a time that suits you.

Is there a call-out charge for a boiler repair?

No. Time on site is charged by the half hour, and you are given the price before any work starts.

How often should a boiler be serviced?

Once a year. A warranty claim usually needs a service record behind it, and the yearly visit is when a small fault gets caught before it turns into a breakdown in January.

What does a landlord gas safety check include?

The engineer checks each gas appliance and flue you provide, including ventilation, burner pressure and the safety devices, then records the result on a gas safety record, often called a CP12.

My boiler pressure keeps dropping. Is that dangerous?

Low pressure on its own is not dangerous, but a system that keeps losing it is losing water somewhere: a weeping radiator valve, the pressure relief valve or a leak inside the boiler. Topping up treats the symptom, so have the cause found.

Is it worth repairing an old boiler?

Often, yes. If parts are still made and the boiler has been reliable, a repair is usually the cheaper route. If it keeps breaking down, the engineer puts a repair price and a replacement price side by side.

What should I do if my carbon monoxide alarm goes off?

Open doors and windows, turn off gas appliances if you can, get everyone outside and call the National Gas Emergency Service on 0800 111 999. If anyone has a headache, dizziness or nausea, get medical help. The appliance must be checked by a Gas Safe registered engineer before it is used again.

Do you install heat pumps and air conditioning?

Yes. We fit air source heat pumps and install and service air conditioning in homes and on commercial sites. The engineer surveys the property first, because a heat pump needs suitable radiators and insulation to heat a home well.