A new boiler in the UK will typically cost around £2,500 to £4,000, including installation for a straightforward like-for-like combi boiler replacement. However, the final bill can vary considerably depending on the type and size of boiler you need, the brand you choose and how much work is involved in fitting it.
The boiler itself is only part of the expense. Labour, new controls, system filters, pipework alterations, changes to the flue and any work needed to bring an older heating system up to current standards can all increase the price you pay to install a new boiler.