Why Us
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- Why Us
Heating you can trust,
done properly the first time
We combine manufacturer-grade expertise with a genuinely premium customer experience from first call to aftercare.
Gas Safe & Accredited
Every engineer is Gas Safe registered and manufacturer-trained by Baxi and Vaillant, so your installation is certified, compliant and safe.
Up to 10-Year Warranty
We fit market-leading boilers with extended manufacturer warranties, plus our own workmanship guarantee for total peace of mind.
Fast, Reliable Response
Same-day emergency callouts and rapid installs across London. When your heating fails, we're the team that actually turns up.
Transparent Fixed Pricing
Clear, upfront quotes with no hidden extras. What we quote is what you pay with finance options to spread the cost.
Rated 4.9★ by Locals
Hundreds of five-star reviews from London homeowners, landlords and estate agents who trust us with their properties.
Tidy & Respectful
We treat your home like our own dust sheets down, work areas cleaned, and everything explained before we leave.
A simple, five-step journey
From first enquiry to lifetime aftercare clear, calm and completely hassle-free.
Enquiry
Get an instant online quote or call us we'll understand your needs in minutes.
Survey
A free, no-pressure survey (in person or by photo) to confirm the perfect solution.
Install / Repair
Gas Safe engineers complete the work cleanly and efficiently, often in a single day.
Testing
Full commissioning, safety checks and certification and we walk you through it all.
Aftercare
Warranty registration, servicing reminders and a team that's always a call away.
Your questions, answered
Everything you need to know about boilers, pricing and our service.
A new combi boiler installation in London typically ranges from £1,900 to £3,500, depending on the brand, boiler size and how complex the installation is. Use our instant quote tool above for a tailored, no-obligation price in under 90 seconds.
Yes — absolutely. Every Diamond Gas engineer is Gas Safe registered, fully insured and manufacturer-accredited by Baxi and Vaillant. We're happy to show our registration on arrival.
Yes. We offer same-day emergency callouts across London for boiler breakdowns, no heating, no hot water and suspected gas leaks. Call 07534 652448 and we'll prioritise you.
New installations come with up to a 10-year manufacturer warranty on Baxi and Vaillant units, plus our own workmanship guarantee. We register the warranty for you so you're covered from day one.
Most standard boiler swaps are completed within a single day. After your survey we can often install within 24–48 hours — sooner in an emergency.
Yes — we offer flexible finance options so you can spread the cost of a new boiler into affordable monthly payments. Ask our team for details when you request your quote.