Boiler Replacement Cost – A Straight‑Forward Guide

If your boiler’s making weird noises or popping up error codes, you’re probably wondering how much a replacement will set you back. The answer isn’t a single number – it depends on the type of boiler, the size of your home, and a few hidden fees. In this guide we break down the biggest cost drivers, give you a realistic price range for the UK, and share simple ways to save money.

What Makes Boiler Prices Vary?

First, the type of boiler matters. A basic conventional boiler can start around £500, while a high‑efficiency combi model often begins at £1,200. If you need a system boiler for a larger property, prices jump to £2,000 or more. The fuel type (gas, oil, or electric) also changes the price – gas is usually the cheapest to run, but oil units cost more upfront.

Next, look at capacity. A 24kW boiler might be fine for a one‑bedroom flat, but a three‑bedroom house often needs 30‑35kW. Oversizing means you pay for a bigger unit you’ll never fully use; undersizing means it will struggle and could break down sooner.

Installation labour is the next big chunk. Even a cheap boiler can end up costing £800‑£1,200 in labour if the pipes need rerouting or the old flue has to be removed. Extra work like adding a new thermostat, fitting an expansion tank, or complying with new building regs can add another £200‑£500.

Typical UK Price Range

Here’s a quick snapshot of what most homeowners see:

• Basic conventional boiler: £500‑£900 for the unit, £600‑£1,000 installation.
• Combi boiler (mid‑range): £1,200‑£1,800 unit, £800‑£1,200 installation.
• System boiler (larger homes): £2,000‑£3,500 unit, £1,000‑£1,800 installation.

All together, a full replacement usually lands between £1,500 and £4,500. Anything outside that range probably includes extra work like new pipework or a full heating system overhaul.

Don’t forget the optional extras: a smart thermostat (£150‑£250) can shave off a few pounds on your yearly bill, and a yearly service plan (£80‑£120) can keep the boiler running efficiently and avoid costly breakdowns.

One last tip – always ask for a written quote that separates equipment, labour, and any extra charges. A clear breakdown helps you compare quotes from different installers without hidden surprises.

Bottom line: your boiler replacement cost hinges on the type, size, and installation complexity. By knowing the typical price bands and asking the right questions, you can avoid sticker shock and pick a solution that fits both your home and your wallet.