Boiler replacement cost: what it really costs in 2026
A Qome Snap Guide: quick, honest and no guff. Approximate figures, adjusted to your region inside Qome.
Snap answer
£2,800 – £5,600
A like-for-like combi swap starts around £2,800. Adding a system upgrade takes it to roughly £4,200, and premium boilers with full works around £5,600.
Takes1–3 daysDisruptionHeating and hot water off for a day or two
Cost at a glance
Option
Best for
Guide range
Combi like-for-like
Same position, straightforward swap
£2,800 – £3,500
With system upgrade
New controls, filter, flush
£4,200 – £4,800
Premium install
Top-tier boiler, long warranty
£5,600+
Approximate guide figures, not quotes, Qome adjusts every price to your region.
What actually happens
Old boiler drained and disconnected
New boiler mounted and flued
Connected to gas, water and heating circuits
System power-flushed and inhibitor added
Smart controls or thermostat fitted
Commissioned, certified and registered for warranty
Price by region
Starting figures by region, the same honest baseline, adjusted for where you live.
London (Inner)from £4,300
London (Outer)from £3,800
South Eastfrom £3,400
East of Englandfrom £3,100
South Westfrom £2,900
Scotland (Highlands)from £2,700
West Midlandsfrom £2,600
North Westfrom £2,600
East Midlandsfrom £2,600
Scotland (Central)from £2,500
Yorkshirefrom £2,500
Walesfrom £2,500
North Eastfrom £2,400
Northern Irelandfrom £2,300
Popular choices
Smart thermostat controlMagnetic system filter10–12 year manufacturer warranties
Rules & regulations
Gas boiler work is illegal unless done by a Gas Safe registered engineer, always check the card
The installer should self-certify the job with building control and register your warranty
Snap tips
A power flush with the swap protects the new boiler, cheap insurance
Oversizing wastes money; a heat-loss calculation beats guesswork
Price it properly on Qome
Choose your options and see an honest, region-adjusted estimate, free.