๐Ÿงฎ Interactive Calculator ยท April 2026

Boiler Replacement Cost Calculator UK

Get a 2026 UK boiler replacement quote in 30 seconds. Choose home size, boiler type, brand tier and install scope โ€” instant low/mid/high estimate. Worcester Bosch, Vaillant, Baxi, Ideal pricing. Gas Safe registered installer rates included.

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Worcester ยท Vaillant ยท Baxi ยท Ideal
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Updated April 2026
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Gas Safe registered rates
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Free ยท no email required

Estimate Your Boiler Replacement in 30 Seconds

5 steps. Includes boiler unit, flue, magnetic filter, labour, gas safety check, certification, VAT, and 1-year warranty. Excludes: smart thermostats (~ยฃ250 extra), TRVs, system flushes (ยฃ300-ยฃ600).

Boiler Calculator Questions

How accurate is this calculator?

Mid figure matches Gas Safe registered installer averages for 2024-2025. Variance ยฑ20% reflects real quote spread. Site-specific factors not modelled: flue routing complexity, magnetic filter type, smart thermostat, system flush requirement.

Why are some Worcester quotes so different?

The difference is the model line โ€” Worcester has 4 tiers (4000, 7000i, 8000 Style, 8000 Lifestyle). The 4000 series sits in mid tier; the 8000 Lifestyle is premium. Always check the model number, not just the brand. The 8000 Lifestyle includes a 12-year warranty when installed by an Accredited Installer.

What is the BUS grant?

The Boiler Upgrade Scheme (BUS) gives £7,500 toward replacing a fossil-fuel boiler with a heat pump (not a new gas boiler). If you're considering a heat pump as an alternative, see our heat pump cost guide. Most homes still replace like-for-like as gas boilers are 1/3 the upfront cost of heat pumps.

Should I get a magnetic filter?

Yes โ€” magnetic filters (Magnaclean, Adey) capture metallic sludge before it reaches the boiler, extending its life and protecting the warranty. Most premium installers fit one as standard (~ยฃ250 installed). It's required for some manufacturer warranties (Worcester, Vaillant).

How long does installation take?

Like-for-like combi swap: 1 day. System change (e.g. regular → combi): 2-3 days. New install / major relocation: 3-5 days. Old boiler removal, new pipe routing, gas safety check, certification, and Building Regs notification (every install) included.

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Compare quotes from Gas Safe registered local installers. Brand, warranty, and lead time side-by-side. No obligation.

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