Apparatus (1, 101) for providing domestic hot water, comprising a. a heat pump (20, 120) for heating water, in particular drinking water, to a warm water temperature and thus for producing the domestic hot water, wherein the heat pump (20, 120) comprises an evaporator for utilizing a fluid as a heat source for evaporating a refrigerant, a condenser (22, 1 22) for condensing the refrigerant and a compactor for compressing the refrigerant, in particular a compressor for compressing the refrigerant, and has a heat pump operating mode in which the heat pump (20, 120) provides heat power on the side of the condenser for heating the water to the warm water temperature, and b. a warm water storage (40, 140) for storing the domestic hot water, the warm water storage (40, 140) having a warm water storage volume, wherein the heat power of the heat pump (20, 120) in the heat pump operating mode divided by the warm water storage volume is less than 2.5 watts per liter, preferably less than 2.15 watts per liter, characterized in that that in the heat pump operating mode, the compactor, in particular the compressor, requires a compactor nominal power for its operation, wherein the compactor nominal power divided by the warm water storage volume is at most 1.4 watts per liter, the heat pump (20, 120) is an air-water heat pump and thus the fluid and thus the heat source is air, the apparatus (1, 101) comprising a fan for supplying air as a heat source to the evaporator, wherein, with the fan in operation at ambient pressure, the evaporator can be supplied per second with an air volume of air, wherein a speed of the air moved by the fan is less than 0.8 m/s, the apparatus (1, 101) comprising an air channel through which, when the fan is operating at ambient pressure, the air volume air can be supplied per second to the evaporator by the fan, the air channel comprising an air inlet for letting in air from an ambient of the apparatus (1, 1 01) and an air outlet for discharging air into the ambient of the apparatus (1, 101), the air channel having a minimum cross section, wherein the air volume divided by the minimum cross section is less than 0.8 m, thus ensuring that the speed of the air moved by the fan is less than 0.8 m/s. a. a heat pump (20, 120) for heating water, in particular drinking water, to a warm water temperature and thus for producing the domestic hot water, wherein the heat pump (20, 120) comprises an evaporator for utilizing a fluid as a heat source for evaporating a refrigerant, a condenser (22, 1 22) for condensing the refrigerant and a compactor for compressing the refrigerant, in particular a compressor for compressing the refrigerant, and has a heat pump operating mode in which the heat pump (20, 120) provides heat power on the side of the condenser for heating the water to the warm water temperature, and b. a warm water storage (40, 140) for storing the domestic hot water, the warm water storage (40, 140) having a warm water storage volume, wherein the heat power of the heat pump (20, 120) in the heat pump operating mode divided by the warm water storage volume is less than 2.5 watts per liter, preferably less than 2.15 watts per liter, characterized in that that in the heat pump operating mode, the compactor, in particular the compressor, requires a compactor nominal power for its operation, wherein the compactor nominal power divided by the warm water storage volume is at most 1.4 watts per liter, the heat pump (20, 120) is an air-water heat pump and thus the fluid and thus the heat source is air, the apparatus (1, 101) comprising a fan for supplying air as a heat source to the evaporator, wherein, with the fan in operation at ambient pressure, the evaporator can be supplied per second with an air volume of air, wherein a speed of the air moved by the fan is less than 0.8 m/s, the apparatus (1, 101) comprising an air channel through which, when the fan is operating at ambient pressure, the air volume air can be supplied per second to the evaporator by the fan, the air channel comprising an air inlet for letting in air from an ambient of the apparatus (1, 1 01) and an air outlet for discharging air into the ambient of the apparatus (1, 101), the air channel having a minimum cross section, wherein the air volume divided by the minimum cross section is less than 0.8 m, thus ensuring that the speed of the air moved by the fan is less than 0.8 m/s.