Parts problems As your boiler gets older, it can get ever harder and costlier to find spare parts when it needs repairing, so you need to do your research on their price and availability. If it's very expensive to replace obsolete parts, it's only worth repairing your boiler if it rarely has issues.

Average boiler repair costs. In the UK, the average boiler repair cost is between £100 and £500. This cost is influenced by the complexity of the fault, the parts required and regional labour charges.

The average cost for boiler installation is usually between £1,500 – £3,000 but can reach costs of £5,000 based on the additional parts and labour that come with more complex installations. Therefore, a like-for-like swap will cost considerably less than the average cost of a new boiler.

Gas boilers can have varying costs for their components, which depend on factors such as brand, model, and age. Generally, the most expensive part of a gas boiler is the heat exchanger, as it plays the main role in transferring heat from burning gas to circulating water for heating purposes.