Q&A: Boiler Replacement

How Much Does It Cost to Replace a Boiler?

The average cost to replace a boiler is around £2,000, depending on the type of boiler, installation requirements, and any upgrades needed. Most combi‑to‑combi replacements fall between £1,800–£2,500, fully supplied and installed.

All our quotes are fixed‑price, transparent, and include:

• Full installation

• All materials

• Removal of your old boiler

• Registration & certification

• Manufacturer warranty (5–10 years)

You can get an exact price in 60 seconds using our Free Online Boiler Quote Calculator.

Signs Your Boiler Needs to Be Replaced

A boiler doesn’t usually fail overnight — it gives warning signs. If you’re noticing any of the following, it may be time to consider a replacement:

• Frequent breakdowns or repeated call‑outs

• Rising energy bills despite no change in usage

• Uneven heating or radiators staying lukewarm

• Strange noises such as banging, whistling, or rumbling

• Leaks or visible corrosion

• Slow hot water recovery

• Boiler parts becoming obsolete or difficult to source

• Boiler over 15 years old and running inefficiently

Replacing early often saves money by avoiding expensive repairs, system damage, and emergency failures.

Should You Replace a 20‑Year‑Old Boiler?

In most cases, yes. A 20‑year‑old boiler is well beyond its efficient working life.

Here’s why replacing it is usually the smarter choice:

• Efficiency: Modern boilers are up to 30% more efficient, instantly reducing your energy bills.

• Reliability: Older boilers are far more prone to breakdowns and costly repairs.

• Parts availability: Many components for older models are discontinued.

• Safety: New boilers have advanced safety features and better combustion control.

• Heating performance: You’ll get faster hot water, better radiator heat, and a more consistent home temperature.

Most customers save hundreds per year in running costs alone after upgrading.