New Combi Boiler Deals: Cost, Finance & Options (2026 UK)
A combi boiler is the most popular heating choice in UK homes, and there are more ways than ever to buy one in 2026: fixed-price online packages, a local installer, or spreading the cost with finance. The catch is that the cheapest headline price is rarely the best deal — the right boiler size, a proper installation and a solid warranty matter far more over the boiler’s 10–15-year life. This guide compares the buying routes, sets out realistic fitted costs, and shows you what a genuine deal should include so you can compare offers fairly.
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How much is a new combi boiler in 2026?
Typical 2026 UK combi boiler costs, supplied & fitted:
- Budget combi, straight swap — £1,800–£2,400
- Mid-range combi, standard install — £2,300–£2,900
- Premium combi with long warranty — £2,800–£3,500+
- Boiler on finance — spread monthly; total cost depends on APR & term
The fitted price depends on the boiler brand and size, whether it is a like-for-like swap or a relocation/conversion, and extras such as a magnetic filter, chemical flush and smart thermostat. Rates vary by region and change often — always compare live fitted quotes for your postcode rather than a headline package price.
Compare How to Buy Your Combi Boiler
The right route depends on whether your install is simple or complex, and how much you value a local relationship versus a fast fixed price.
Fixed-price online package
You answer a few questions online and get a fixed price, often with next-day fitting. Fast and transparent for a straightforward like-for-like swap. Watch that the quoted boiler is correctly sized and that filter, flush and any flue extension are included, as add-ons can close the gap to a local installer.
Local Gas Safe installer
A local installer surveys in person, which matters if you are relocating the boiler, converting from a system boiler, or have an older property. You get accountability and a relationship for future servicing. Get three quotes to keep pricing keen.
Boiler on finance
Both routes often offer finance to spread the cost monthly. Useful for an emergency replacement, but check the APR, total repayable and whether interest-free options exist. The cheapest lifetime cost is usually paying outright if you can.
Check the Deal, Not Just the Price
Correct boiler size
An oversized or undersized combi wastes money and underperforms. A good deal starts with the right output for your radiators and hot-water demand.
Filter & flush
A magnetic filter and a system clean protect the new boiler and are often required to validate the warranty. Confirm both are in the price.
Warranty length
Warranties range widely by brand and installer accreditation. A longer registered warranty can be worth more than a small saving on the fitted price.
Controls & making good
Check whether a smart thermostat, flue work, and tidying up after the swap are included, or quoted as extras that inflate the final bill.
Common Questions
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