Although the great majority of British dwellings are heated by individual gas systems, there are some instances, particularly in blocks of flats and retirement homes, where individual gas appliances cannot be specified. In these buildings the alternative to individual systems is a group heating scheme whereby a central boiler plant supplies hot water to each flat for heating and domestic hot water. In the past, group heating systems have not always been successful. Comparative results show that energy use of group heating systems is, on average, 50% higher than that of individual systems.
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