Other elements we should know? Qualifying boilers installed in existing buildings may be eligible for a right-sizing bonus if they are sized in accordance with. Do you love stahl’s excellent service? All radiator prices include delivery and can be delivered on a next day basis if required we also offer installation starting from £ inc.vat. We had a combi okay, hot water whenever you require it, but if somebody turns a tap on when you're in the shower, heavens you know about it! If you need it.