Projects
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Real installs, real transformations
A snapshot of recent boiler and heating work across London.
Vaillant Combi Swap
Whitechapel · 1-day install
Full System Upgrade
Bow · 8 radiators + smart controls
Emergency Leak Fix
Stepney · Same-day callout
Baxi System Boiler
Canary Wharf · Flat conversion
Power Flush + Radiators
Mile End · Restored circulation
No Hot Water Fault
Poplar · Diagnosed & fixed
Before
After
Tap & Sink Replacement
London · Complete upgrade
Our Customer Reviews On Google
Diamond Gas replaced our old boiler with a new Vaillant in a single day. Spotless work, clearly explained, and cheaper than two other quotes. Genuinely faultless.
Read moreBoiler died on a Sunday with a newborn in the house. They came out same day, diagnosed it and had us back up and running within hours. Absolute lifesavers.
Read moreAs a landlord with 9 properties I need reliable engineers. Gas certs are always done on time and their reporting is brilliant. My go-to team in London.
Read moreYour 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.