Combi boiler prices in the UK: supply-only and fitted

Supply-only pack prices

Our shop lists over 400 combi boiler packs from Worcester Bosch, Vaillant, Ideal, Baxi, Glow-worm, Viessmann, Navien, Vokèra, Alpha and Keston. A pack is the boiler plus flue, and in many cases a system filter — check the contents list on each product page, because packs with and without filters look similar.

Entry combis start in the hundreds of pounds for the hardware; premium large-output combis run well past £1,500 supply-only. Every product page shows the exact pack price including VAT.

Fitted prices

Supplied and fitted, our combi installations run from £2,415 (Worcester Bosch Greenstar 1000 25kW) to £4,285 (Vaillant ecoTEC Plus 40kW) including VAT. The fitted figure includes labour, flue work, commissioning and warranty registration.

Why the cheapest boiler can be the expensive choice

A budget boiler with a 1 or 2-year standard warranty can cost more over ten years than a mid-range boiler with a 10-year warranty once you factor in out-of-warranty repairs. Compare the warranty length and conditions alongside the price — our shop cards show both, and you can filter the whole boiler range by warranty length.