| abstract |
The present invention relates to a heating and / or water heating system (100) comprising a heating circuit (20) and a heat pump circuit (30), wherein the heat pump circuit (30) comprises a heat transfer device (3) which is adapted to heat from the heat pump cycle (30). 30) to the heating circuit (20), wherein the heating circuit (20) has a heating circuit (22) with heating flow (23) and heating lag (24), a hot water circuit (26) with hot water supply (27) and hot water run (28) and a adjustable mixer (13), wherein the mixer (13) is adapted to divide a volume flow through the heating circuit (20) at least between the heating flow (23) and hot water supply (27), wherein the heat transfer device (3) comprises a first heat exchanger (3a) and in series with a second heat exchanger (3b), wherein the second heat exchanger (3b) is adapted to heat to the heating circuit (20) in front of the mixer (13) and wherein the first heat exchanger (3a) is adapted to transfer heat to the hot water supply (27) behind the mixer (13). |