Before you buy, make an appointment with the installer to discuss your heating and hot water needs each home – and household – will have very different requirements, and boilers come in many different sizes for this very reason. Smart controls can help with that in fact, you could increase your boiler’s efficiency by an extra %! pretty nifty, eh? Our boilers now come with up to a year manufacturer's warranty. Sign up now to stay updated on the latest news and offers! B general building.