Gas boilers positioned behind a fireplace are regulated for use in the U.K. In 2011, the U.K. Building Regulations recommend the replacement of back boilers for properly positioned boilers with higher fuel efficiency ratings.
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Gas back boilers are commonly made of cast iron and heat water for a home using the heat generated by a fireplace. Ventilation for a back boiler is often completed using the chimney of a home to exhaust fumes.
The building regulations in England and Wales require installation and repair of a gas back boiler by a person registered with the U.K. government as a competent person. It is the responsibility of the competent person to decide if a ventilation system for a gas fireplace is sufficient for the type of appliance.
When using a gas back boiler the chimney used for ventilation does not need to be lined unless a problem is detected by the installer or repair person. Chimney liners are sometimes needed when there is a leak or to improve the draw of the chimney.
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