The strength of the Germany-based company Ecodesign lies in the development of hot water heat pumps. The Ecodesign domestic water heating pumps are ideally suited for the self-consumption of PV surplus energy to generate hot water. The big advantage is that the heating system can be switched off during the summer months and the hot water can be produced using the self-generated electricity from the PV system. This saves costs and is a further step towards self-sufficiency and sector coupling.