The average boiler repair cost is £170 to £360 for the most common repairs. One of the most common failures is the gas valve, a boiler valve cost will average out at £230 – £285. A full list of other itemized repairs, including diverter valves, burner, flue, air pressure switch and more can be seen in the table below.
The most expensive boiler repair is the heat exchanger at £385 to £470. If your heat exchanger fails and the boiler isn’t covered by warranty, then it’s probably time to examine the cost for boiler replacement instead of repair.
Whether to repair or replace is discussed in more detail in the FAQs at the end of the post.