The best boiler brands in the UK — and how to judge them

How we judge a brand

We fit and stock ten brands. Our ranking criteria are boring but honest: warranty length and its conditions, parts availability in five years, and how the manufacturer behaves when something goes wrong.

The tiers we see

• Worcester Bosch — the benchmark. Greenstar 8000+ carries up to 12 years with conditions; strong parts network
• Vaillant — ecoTEC plus ranges run up to 10 years with conditions; excellent engineering
• Ideal — Logic Max and Vogue Max offer 10–12 years; the best value long-warranty boilers we sell
• Baxi — 800 series reaches 10 years with registration; solid mid-price choice
• Glow-worm, Viessmann, Navien, Vokèra, Alpha, Keston — each has strong models; the model matters more than the badge

What 'brands to avoid' lists get wrong

Most avoid-lists punish budget brands for budget warranties. That is backwards: a cheap boiler with an honest 2-year warranty, fitted well and serviced, beats a premium boiler fitted badly. Judge the specific model's warranty terms and the installer's work — not the logo.

Our actual advice

Pick the longest warranty your budget reaches, from a brand with UK parts support, and spend the saving on a proper installation with a flush and filter. Our shop cards show the warranty next to the price for exactly this reason.