Domestic hot water heat pumps

How it works

The domestic hot water heat pump is a separate device and functions without any further supply from a "large" heat pump, which is used for space heating. Instead, it normally uses the waste heat from combustion heaters and other household appliances and is therefore usually installed in the heating cellar or room. It is uncomplicated to install and can be connected simply by mains plug.

Most domestic hot water heat pumps use the principle of the air/water heat pump: they extract part of their heat from the air with the aid of a refrigerant until it evaporates. The vapour is compressed, increasing not only the pressure but also its temperature, and passed on to a heat exchanger. There, the refrigerant condenses and transfers the heat to the service water, which can then reach a temperature of 50 to 65 °C. The heat is then transferred to the heat exchanger, where it is compressed. The refrigerant, which is liquid again, is led back to the starting point via a throttle, which reduces its pressure, where it can absorb heat again.

Advantages of domestic hot water heat pumps

The domestic hot water heat pump offers a number of advantages in areas where it can be used sensibly: By being installed indoors, not only can the air in the room be optimally used for heat generation, but the unit also counteracts the formation of mould by dehumidifying the room. In contrast to some heat pumps for room heating, a domestic hot water heat pump does not require any elaborate planning or approval from the authorities. It can be connected to the lines of your house by a specialist and only needs electricity for the drive, which it receives via a conventional socket.



For the purchase of a domestic hot water heat pump you have to plan for about 3,000 to 4,000 €. In addition there are the costs for the installation of the device, which should absolutely be carried out by an expert. Due to the light construction (power supply and water connection) this can be dealt with within a few hours.

An average domestic hot water heat pump with an annual performance factor of 3 requires approx. 810 kWh of electricity for a 4-person household, assuming a per capita consumption of 40 litres, heated to 45 °C. The average consumption is approx. 810 kWh. With an electricity price of approx. 29 cents per kWh this results in running costs of approx. 235 € per year.

Domestic hot water heat pumps from alpha innotec

The entrance into an environmentally friendly hot water production does not have to be expensive. The service water heat pumps from alpha innotec convince with their easy handling and low energy costs. You have the choice: Our BWP series can be easily installed in your utility room and uses the waste heat from heating, washing machine or dryer. The WWB 21, which uses the principle of the water/water heat pump, is ideal for an apartment building or an efficiency house in a new building.

Heating water or a solar thermal system, for example, can be used as a heat source. One advantage of this model is that it is a decentralised system. This means that it generates hot water directly where it is needed. No heat is lost through the circulation in the pipes. If you want to upgrade your existing DHW cylinder to a DHW heat pump, we recommend the DHW module LWB. This model is characterised by its simple installation and is an excellent retrofit solution.

SeriesProduct typeAreas of application & special features
BWP-SeriesBWP 190Sindoor installation, one / two family house, new building, modernization
BWP-SeriesBWP 260Sindoor installation, one / two family house, new building, modernization
WWB-SeriesWWB 21indoor installation, single/two-family house, multiple dwelling, new construction, modernisation; decentralised solution
LWB-SeriesLWBone / two-family house, multiple dwelling, new building, modernisation; retrofit solution for existing hot water storage tank

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