Heat Only Boiler Replacement Cost

Heat Only Boiler Replacement Cost

Replacing a heat only (conventional) boiler costs between £1,200 and £3,500 installed. This includes the boiler, pump, controls, and flue — but not a new cylinder unless required.

When to Replace vs Repair

If your boiler is over 10–15 years old, a replacement is usually more cost-effective. Modern A-rated boilers are up to 30% more efficient than older models.

Like-for-like vs Upgrade

Replacing like-for-like is cheapest. Upgrading to a combi or system boiler involves more work and costs more, but can improve efficiency and remove the need for a tank in the loft.