Which supermarket is cheapest? Related work experience or completion of a plumber program at a college or technical institute can reduce the time required to complete your apprenticeship. Smart controls can help with that in fact, you could increase your boiler’s efficiency by an extra %! pretty nifty, eh? See below for a list of accredited installers for our electric combi boilers. Tile now available in our showroom! First, try using a plunger second, try using.