This type of boiler can provide controlled central heating and an independent gas fire of room heater at the front. The back boiler and the gas fire or room heater share the same open flue in the chimney. Most importantly the fresh air supply to the boiler and gas fire should come from the air in the room. Hence the room must have adequately sized fresh air vents fitted for the boiler and gas fire to function without danger. Otherwise the boiler can poisonous carbon monoxide. In very cold days these air vents may create a cold draught in the room, for safety reason never partly or totally block them. If you have draught proofed or double glazed your house call in a CORGI registered professional to checkout the fresh air requirements for the boiler & fire, and obtain a safety certificate from him. Its a good practice to check & service the boiler & fire every year, is a legal requirement if you are a landload.
Because back boilers uses open flue which demand high temperature flue gas these are not very energy efficient even the new ones rated at about 78%
To check your boiler efficiency at www.boilers.org.uk
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