These boilers are fitted into the opening behind a fireplace surround and are usually hidden behind a gas fire.
A back boiler unit will save space elsewhere in the house, but its output is limited to 16kW (55,000 BTU/hr).
The noise when operating can at times be intrusive, also required is permanent ventilation direct to outside must be maintained at all times.
If an old BBU is replaced for a new unit it may be necessary to renew the existing flue liner as well.
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