Domestic hot water denotes the hot water that is used in a home for showering, washing, etc. It is produced by heating domestic cold water in either a domestic hot water heat exchanger or in a hot water vessel.
Central domestic hot water production
With central domestic hot water production, the domestic hot water for a block of flats is produced centrally in a machine room. From the machine room, the domestic hot water is distributed out to the consumption points through a pipe system. Circulation of domestic hot water is often carried out to improve comfort, as the waiting time for the hot water otherwise can be unacceptably long.
Central domestic hot water production requires less total installed heat power capacity compared to decentral domestic hot water production for an equivalent number of consumers.
Decentral domestic hot water production
With decentral production, domestic hot water is produced individually in each flat in a block. Decentral domestic hot water production often does not require hot water circulation since the consumption points are close to the production point.
Compared to central production, decentral domestic hot water production demands a relatively large installed heat power capacity per consumer, as it is not possible to utilise the simultaneous effects.