Harrow & Hertfordshire gas engineers
Gas Engineers in Harrow.Boilers fitted & fixedby trusted engineers.
Gas Safe registered heating engineers with 20 years' experience. New boilers, repairs, servicing and landlord certificates across North West London and Hertfordshire.
20 years
trade experience
24/7
emergency call-outs
Up to 10 yrs
boiler warranties
£10m
public liability cover
What we do
Everything your heating needs, under one roof
One trusted team for installs, repairs, servicing and certificates, so you never have to shop around again.
Boiler Installation in Harrow
Worcester Bosch and Vaillant approved installs with up to 10-year manufacturer warranties.
Bespoke quote after survey
Get a quote for boiler installation
Boiler Servicing in Harrow
Annual boiler service from £100 to keep your boiler safe, efficient and within warranty.
From £100
Get a quote for boiler servicing
Boiler Breakdown & Repair in Harrow
Fast diagnosis and repair to get your heating and hot water back on.
Get a quote for boiler breakdown & repair
Emergency Boiler Repair (24/7) in Harrow
Breakdowns and heating faults handled 24 hours a day, 7 days a week.
Get a quote for emergency boiler repair (24/7)
Landlord Gas Safety Certificate (CP12) in Harrow
Fixed-price CP12 certificates for landlords at £75.
£75
Get a quote for landlord gas safety certificate (cp12)
Heating Fault Finding in Harrow
Accurate diagnosis of cold radiators, pressure loss, noisy systems and control faults.
Get a quote for heating fault finding
Power Flushing & Radiator Installation in Harrow
Clear sludge from your system and add or replace radiators.
Get a quote for power flushing & radiator installation
Hot Water Cylinder Installation & Repair in Harrow
Unvented and vented cylinders installed, replaced and repaired.
Get a quote for hot water cylinder installation & repair
Heat Pump Installation & Servicing in Harrow
Air source heat pump installation and servicing across Hertfordshire and London.
Get a quote for heat pump installation & servicing
Underfloor Heating Installation & Maintenance in Harrow
Wet underfloor heating installed and maintained for even, comfortable warmth.
Get a quote for underfloor heating installation & maintenance
Smart Heating Controls in Harrow
Smart thermostats and controls to manage your heating from your phone.
Get a quote for smart heating controls
General Plumbing in Harrow
Leaks, taps, toilets, pipework and general plumbing repairs.
Get a quote for general plumbing
Clear pricing
No guesswork. You know the price before we start.
CP12 certificates cost £75. Boiler servicing starts from £100, and a combined visit starts from £150. New boilers are priced individually after we've seen your home, so you only pay for what you actually need.
Book on 07843 900760Landlord Gas Safety Certificate (CP12)
Fixed price
£75
Boiler service
Annual service
From £100
Gas certificate + boiler service
Combined visit
From £150
New boiler installation
Survey and bespoke quote
Bespoke
How it works
From first call to warm home in three simple steps
01
Call or send the form
Tell us what's wrong or what you need, and give us your postcode.
02
We give you a clear price
CP12 £75, boiler servicing from £100. A bespoke quote for new boilers.
03
We do the job properly
Gas Safe engineers complete the work and we fix any issue until you're fully satisfied.
Why homeowners & landlords choose J&L
Peace of mind is built into every job
A boiler is one of the most important things in your home. When it fails, you need someone qualified, insured and quick to respond. That's where our 24/7 emergency boiler repair comes in. When you replace it, you need it fitted right first time, with a warranty that actually protects you.
That's what we've done for 20 years. As approved installers for Worcester Bosch and Vaillant, our new boiler installations in Harrow use boilers that come with manufacturer warranties of up to 10 years, and every copper pipework job carries our own 10-year guarantee. Regular annual boiler servicing keeps that warranty valid, and landlords can book a Landlord Gas Safety Certificate (CP12) at a fixed price.
Gas Safe registered
Registration number 961481.
Approved installers
Worcester Bosch and Vaillant approved installers.
Fully insured
£10 million public liability cover.
24/7 emergency
Breakdowns don't wait for office hours. Nor do we.
10-year pipework guarantee
On all copper pipework.
Satisfaction commitment
We'll fix any installation issue until you're happy.
Customer reviews
What our customers say
“Lawrence did a speedy and professional job for repairing my underfloor heating, and also maintenance for boiler/hot water system. Very impressed and would recommend him!”
Jeneiv Galaiya
Google review
“Very good service. Fitted some bath shower mixer taps and towel rail radiators in my bathrooms. Good, clean professional job. Took the time to check everything properly and provided an explanation of what needed to be done and how. Highly recommend and would use again for future plumbing jobs.”
Rahul Vyas
Google review
“We've used J&L many times, for big jobs and small, and they are just brilliant. Decent, trustworthy, friendly and reliable. Nothing fazes Lawrence! He has the most positive attitude of any tradesman I've known…”
Stephen Cranch
Google review excerpt
Where we work
Based in Harrow. Covering North West London and Hertfordshire.
- Harrow
- London
- Watford
- Stanmore
- Radlett
- St Albans
- Bushey
- Rickmansworth
- Hemel Hempstead
- Barnet
- Pinner
- Edgware
- Wembley
- Ruislip
- Northwood
- Borehamwood
- Mill Hill
- Kings Langley
Banner House, 29 Byron Road, Harrow, HA1 1JR
Questions
Straight answers before you call
Can't see your question? Ring us; we're happy to help.
Are you Gas Safe registered?
Yes. J&L Gas & Renewables is Gas Safe registered, number 961481. You can check this on the Gas Safe Register before we arrive.
Do you offer a 24/7 emergency service?
Yes. We run a 24/7 emergency service for boiler breakdowns and heating faults across Harrow, North West London and Hertfordshire.
How much is a landlord gas safety certificate?
A Landlord Gas Safety Certificate (CP12) costs £75. A combined certificate and boiler service starts from £150.
How much does a new boiler cost?
Every home is different, so boiler installations are priced individually after a survey. On installations over £2,000 we usually take a 50% deposit, with the balance paid by bank transfer on invoice.
What warranty comes with a new boiler?
As Worcester Bosch and Vaillant approved installers, we can offer manufacturer warranties of up to 10 years on new boilers. Copper pipework carries a 10-year guarantee.
Heating problem?We're one call away.
Day or night, a Gas Safe engineer is ready to help.