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A Back Boiler is high efficiency gas boiler that generates efficient heat for the central heating and domestic hot system from a unit that is fitted into the fireplace and behind an electric or gas fire. A Back Boiler works in the same way as a Regular Gas Boiler and is an ideal replacement for an existing old Back Boiler. Most Back Boilers are also Condensing Back Boilers that reclaim latent heat from the flue gases which would be lost by a non-condensing boiler. Households that opt for a Condensing Back Boiler will find that their gases bills fall and their home carbon footprint is significantly reduced.