The reversible air-to-water heat pump from Dimplex is an energy-efficient heating and cooling device. The integrated regulation enables heating in winter and cooling in summer with fan convectors and panel heating. In cooling operation, an integrated additional heat exchanger uses the waste heat directly as a free energy source for domestic hot water and swimming pool water preparation. Particularly high coefficients of performance (COPs) are obtained when the waste heat in cooling operation can be used continuously (e.g. for pre-heating a production process).