The hot water heating system has primary energy-heat exchangers from the group of solar heat exchanger (10), air heat exchanger (12) and earth heat exchanger. The heat exchanger has supply lines (10a,12a) serving the transport of a cooled sole and return lines (10b,12b) serving the transport of the heated sole. A compressor of a heat pump is formed as secondary energy-heat exchanger (18) for heat transmission from the sole to a cooling medium. A condenser (28) of a heat pump is formed as tertiary energy- heat exchanger (22) for heat transfer from cooling medium to water.
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