Abstract: A heating installation comprising: a first circuit (C1); a second circuit (C2); a first heat pump (4) for heating the medium in the first circuit; a heat exchanger (10) which is arranged in the second circuit and connected between a condenser (4b) and an expansion valve (4d) of the first heat pump; a second heat pump (11) arranged for heating a medium by absorbing heat energy from the medium in the second circuit; and a first and a second accumulator tank (A1, A2) arranged in series in the second circuit for accumulating the medium in the second circuit. The accumulator tanks are alternately connectable to the second heat pump in order to allow medium to circulate between the first accumulator tank and the evaporator of the second heat pump in a first operating situation and allow medium to circulate between the second accumulator tank and the evaporator of the second heat pump in a second operating situation.

Abstract: A heating installation comprising: a first circuit (C1); a second circuit (C2); a first heat pump (4) for heating the medium in the first circuit; a heat exchanger (10) which is arranged in the second circuit and connected between a condenser (4b) and an expansion valve (4d) of the first heat pump; second and third heat pumps (11, 13) arranged for heating a medium by absorbing heat energy from the medium in the second circuit; and an accumulator tank (12) arranged in the second circuit downstream of the second heat pump (11). The accumulator tank is connected to an evaporator (13a) of the third heat pump (13) in order to allow medium to circulate between the accumulator tank and this evaporator so that heat exchange between the medium in the second circuit and a working medium of the third heat pump is possible via the evaporator of the third heat pump.

Abstract: A heating installation comprising: —a first circuit (C1); —a second circuit (C2); —a first heat pump (4) for heating the medium in the first circuit; —a first heat exchanger (10) arranged in the second circuit (C2) and connected between a condenser (4b) and an expansion valve (4d) of the first heat pump; —a second heat pump (11) arranged for heating a medium by absorbing heat energy from the medium in the second circuit; and —a second heat exchanger (12) and a third heat exchanger (14) for transferring heat from the medium in the second circuit to water in a water supply line (13). The second heat exchanger (12) is connected to the water supply line upstream of the third heat exchanger (14) in order to allow the second heat exchanger to preheat the tap hot-water in a first step and the third heat exchanger to preheat the tap hot-water in a subsequent second step.