New Boiler Installation in Westminster
A new boiler is a considered purchase, not a distress one — even when the old boiler forces the timing. Our Westminster installers quote fixed, itemised prices after a proper survey, and the cost table below gives you honest national bands before anyone visits.
Combi, system or heat-only — the honest steer
The rule of thumb that survives contact with reality: one bathroom and reasonable mains pressure, choose a combi; family house where two showers run at 7.30am, choose a system boiler and cylinder; ageing gravity system in a house you're not renovating, a modern heat-only swap can be the pragmatic move. A good installer measures your mains flow before recommending — if nobody's run a tap into a jug, the recommendation is a guess.
What happens on installation day
A straight combi swap is typically a one-day job: old boiler drained and removed, new boiler mounted, flue fitted, condensate run, system cleansed and inhibitor added, magnetic filter fitted, controls connected, then commissioning — gas-rate and combustion checks, benchmark record completed, and a walkthrough of the controls. Conversions run two to three days. Water is off for part of the day; heating is live and tested before the installer leaves your Westminster home.
Warranties, paperwork and aftercare
The boxes that must be ticked: warranty registered with the manufacturer within the deadline, building-control notification lodged (the Gas Safe notification handles this for gas installs), benchmark commissioning record completed in the boiler's log, and your first annual service booked eleven-ish months out to keep the warranty alive. Network installers do all four as standard — it's a condition of taking installation work through us.
Timing matters for boiler installation & replacement in Westminster more than most people expect. Engineer diaries across Greater London empty in late spring and fill sharply with the first cold snap, so planned work booked out of season is both cheaper and scheduled at your convenience. Emergencies are prioritised year-round regardless.
Frequently asked questions
How much is a new boiler in Westminster?
Most Westminster combi replacements land between £1,800 and £2,800 installed; conversions and system-boiler installs range higher, typically £2,500–£4,500. Your fixed quote follows a survey — the quote form on this page captures what the surveyor needs to price accurately.
What size boiler do I need?
Size follows demand, not house pride: bedroom and bathroom count, radiator count and mains flow rate determine it. Oversizing wastes money and cycles the boiler; undersizing disappoints at the shower. The quote survey calculates it — our sizing guide explains the logic.
Will you take away my old boiler?
Yes — removal and responsible disposal of the old appliance and any redundant tanks or cylinders is included in network quotes. Cylinder and tank removal in conversions is itemised so you can see its share of the price.
How long does a boiler installation take?
A like-for-like combi swap: usually one day. A conversion from cylinder system to combi, or a relocation: two to three days. You'll be told the expected duration with the quote, and the heating is commissioned and working before the installer leaves.