Abstract: The heat charging apparatus includes a chair-like frame structure into which a cube-shaped housing is installed about 1 meter from the floor. The housing includes a heat pump, a fan, and other necessary equipment. On its front side the housing is provided with an air intake and on both side walls as well as on the top with air outlets for the pressurized air produced by the fan. The housing is equipped with pipe connections for the supply of warm water as well as for water to be heated as well as with a drip water outlet. The device has a compact design for the housing or the heat pump with a side length of only 55 cm for an output up to 5 kW. As a consequence, the housing with its content is very light and can be replaced by a single unskilled worker so that vast amounts of installation and maintenance costs are saved.

Abstract: A water heating system comprises a low temperature stage with a stratified tank, connected by a line system to a high temperature stage and a distribution stage. Between the high temperature stage and the distribution stage there can be an oppositely flowing line system. Lines carry circulating or mixed water from the distribution stage to a consumption stage. A programmable switching unit is provided for monitoring and controlling the hydraulic network.