The calculation of the carbon intensity of heat supplied to a building by a community heating system should take account of:
• The performance of the whole system, including the distribution circuits, all heat generating plant, and any CHP or waste heat recovery, and
• The carbon emission factors of all the different fuels.
The CHPQA Standard  provides a certification scheme for demonstrating that the thermal and power efficiencies have been estimated in a satisfactory manner.
In some buildings, especially factories, warehouses and workshops, local warm air or radiant heating systems may be acceptable and more efficient than centrally provided systems. Guidance on local systems is given in BRECSU publication GPG 303 .
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