Monday to friday 09:00 - 17:00. Trending price is based on prices over last 90 days. If your boiler is on the floor rather than on the wall, it is likely to be older and much less energy-efficient in this situation it's a good idea to consider a replacement boiler. Prolong the life of your boiler & maintain your warranty with our boiler maintenance. This means that when an owner wants to extend their property by constructing an extension to the rear of their house, they will need to build over.