Which? says whatever you do don't attempt to fix your boiler yourself. What are your experiences of installing a new boiler? how much did you manage to save? let us know! A replacement boilers vary depending on the make, model and company installing the boiler will typically cost around £1,500, with labour costs on top of this. Find more information on asbestos on the. The baxi brand has a range of high-efficiency boilers that have smart controls.