Keston Boiler Repairs
& Installation London
Expert Keston engineers. Same-day emergency repairs, full installations & annual servicing. Gas Safe registered, available 24/7, 365 days a year.
Book This Service
Available 24/7. Gas Safe registered engineers.
2–4 hr Response
Emergency call-out across London
Gas Safe Registered
Every engineer fully certified
Keston Specialists
Parts stocked on every van
Transparent Pricing
Fixed quotes before work starts
Keston boiler repairs London — at a glance
Keston boiler repairs in London cost £150/hr + VAT with no separate call-out fee, and our Gas Safe engineers typically reach you within 2–4 hours. We stock common Keston parts on every van — including PCBs, sensors and fans — so most repairs are completed on the first visit. A Keston combi installation in London costs £3,200–£4,200 including supply, fit and commissioning.
Quick Facts
- Suitable models
- C55, C36, C25, Celsius
- Typical repair time
- 1–2 hours
- Standard rate
- £150/hr + VAT
- Emergency response
- 2–4 hours
- Parts availability
- Common parts on every van
- Warranty
- 12 months on all repairs
London's trusted Keston boiler engineers
Keston is one of Britain's most respected premium boiler brands, known for high efficiency and long service life. When a Keston boiler requires attention, it demands engineers who understand the brand's engineering nuances. At RARE Plumbing & Heating, we have years of hands-on experience servicing, repairing and installing Keston boilers across London's prime residential market.
Our Keston services
Keston fault codes explained
Common Keston boiler fault codes:
Ignition lockout
No flame after 3+ ignition attempts
Flame loss
Flame goes out during operation
Low pressure
System pressure below 0.5 bar
High temperature
Boiler overheat protection triggered
Fan/flue fault
Flue sensor or fan failure
Sensor fault
Temperature or pressure sensor issue
Gas valve fault
Gas solenoid or proportional valve failure
Call us immediately if your Keston is showing a fault code rather than resetting repeatedly.
Common Keston faults we fix
Keston models we work on
We have specialist knowledge across the full Keston range.
New Keston boiler installation
Supply, installation & full commissioning.
Whether you're replacing an ageing system or upgrading to a new Keston model, RARE provides a complete white glove installation service. We handle everything from removal of your old boiler through to commissioning, smart controls setup and warranty registration.
- Removal of old boiler & full system flush
- Supply & installation of Keston boiler
- Magnetic filter installation
- Smart thermostat & controls setup
- Gas Safe certification
- Warranty registration & aftercare
24/7 emergency Keston repairs
Around-the-clock support, whenever you need us.
A Keston is a serious investment, and a fault deserves an engineer who treats it that way. We keep the parts this range needs most commonly stocked on our vans, so most repairs are completed in a single visit — always with a Gas Safe certificate and an agreed price before work begins.
Book a Keston Engineer
Available 24/7 — Gas Safe registered Keston specialists across London.
020 7458 4949Book Online"Our Keston C55 developed a fault mid-winter. RARE had an engineer with us within hours, had the part on the van and the boiler was back on the same day. Unbeatable service."
Sophie L. · Hampstead
"RARE are the only engineers in London I trust with our Keston system. They understand these boilers at a level most plumbers simply don't."
William F. · St John's Wood
"Professional, knowledgeable and honest. Serviced our Keston annually for four years now. Always first class."
Diana M. · Belgravia
Keston repairs — complete topic guide
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iR series specialists
Geminox Boiler Repairs
Thision specialists
Combi Boiler Installation
New boiler supply and fit
System Boiler Installation
For larger homes
Boiler Installation Costs
Full London pricing guide
Boiler Replacement Guide
Repair vs replace explained
Boiler Servicing
Annual Gas Safe service
Boiler Error Codes
Full fault code database
Keston boiler questions answered
Everything you need to know before you call.
Related Services
Boiler Repairs London
All brands, 24/7 emergency response.
ATAG Boiler Repairs
Expert ATAG diagnosis and repair across London.
Geminox Boiler Repairs
Specialist Geminox engineers across London.
Combi Boiler Installation
New Keston boiler supply and fit from £3,200.
System Boiler Installation
For larger homes with multiple bathrooms.
Hot Water Cylinder Installation
Megaflo & unvented cylinder specialists.
Boiler Installation Costs
Full London pricing guide.
Vaillant vs Viessmann
Brand comparison guide.
Power Flushing
Protect your Keston with a thorough system flush.
PPM Membership
Annual Keston service included in care plans.
Authoritative Sources & References
- SourceKeston Boilers — Twin Flue Boilers for Domestic & Light Commercial
Keston Boilers — The official site for Keston, a UK boiler manufacturer specialising in high-efficiency twin flue boilers for domestic and light commercial properties.
- SourceGas Safe Register — Official UK Gas Engineer Registration Body
Gas Safe Register — The only official gas registration body for gas businesses and engineers in the United Kingdom. By law, all gas engineers must be Gas Safe registered.
- .gov.ukThe Gas Safety (Installation and Use) Regulations 1998
legislation.gov.uk — The statutory instrument that makes it a legal requirement for gas work to be carried out only by competent, Gas Safe registered engineers.
- .gov.ukHSE — Gas Safety (Installation and Use) Regulations 1998: Approved Code of Practice (L56)
Health & Safety Executive — The HSE Approved Code of Practice giving guidance on meeting the requirements of the Gas Safety (Installation and Use) Regulations.
Reviewed by RARE Plumbing London Engineering Team
Gas Safe Registered Heating Engineers · Reviewed 27 August 2026