Buying a heat pump

With the help of a heat pump it is possible to use the environmentally friendly energy in an extremely efficient way. This is because the energy already available and also free of charge is the energy source used to heat the home and hot water to a pleasant temperature level. Before homeowners buy a heat pump, it is helpful to know a few points in advance - and to have answers to them. One of these concerns the type of heat pump.

Location influences the type of heat pump

In addition to ambient air, exhaust air and groundwater, a heat pump can also extract heat from the ground. Which of these heat sources is more suitable is individual. In practice, air-water heat pumps are very often used, which is partly due to their relatively quick installation. Of course, price also plays an important role here. After all, an air-water heat pump is the most economical way of heating with environmental heat.

Air source heat pumps can be used in many places

Apart from the low investment costs compared to other heat pumps, the air-water heat pump has other advantages. This means that retrofitting is possible at any time without the need to obtain official permits. Furthermore, an air-water heat pump requires little space and is therefore suitable for both new builds and modernisation. The section on air-water heat pumps explains what homeowners should still be aware of when deciding on this variant.

Ground source heat pumps are highly efficient

If it is possible to run a brine/water heat pump, then homeowners should consider the investment carefully. Because of the constantly high ground output temperature distributed throughout the year, such a heat pump works very efficiently. The subsidies are also significantly higher than for an air-water heat pump.

Basically, heat can be obtained from the ground in two ways: Geothermal probes that are inserted deep into the ground are suitable for confined spaces. If the house to be heated, on the other hand, has a sufficiently large garden that is not built over, ground loop collectors can be used. Like underfloor heating, these are laid below the top layer of earth. From there, they extract heat from the layer of earth and transfer it to the evaporator. In addition to the ground loop collectors, trench collectors can also be used. These require significantly less space.

Calculating the heating requirement

Heat pumps cannot only use different heat sources. They are also available in many output ranges. Before homeowners buy a heat pump, they should consider two aspects: their heating needs and the use of the heat pump. The heat requirement varies depending on the condition of the building and user behaviour. In order for the heat pump to work as efficiently as possible, it should be designed accordingly.

The other aspect concerns use. A heat pump can be used both as a single or a dual system. While most new buildings require only a single heat pump, many home renovators often rely on a combined solution for modernisation. The heat pump operates with the existing heating system and offers system owners not only reliable heat supply but also extremely high flexibility in terms of fuel price.

The image shows the large selection of products for heat pump purchases

The Viessmann heat pump product range

Choosing the right radiators

For an economical operation not only the right performance is important. The radiators and the building itself should also match the heat pump used as well as possible. Two prerequisites for efficient, monovalent operation are, on the one hand, radiators that should manage with low flow temperatures and, on the other hand, good energy values of the building. In practice, underfloor heating in combination with a heat pump has proven to be very effective.

Optimal time to buy a heat pump

Before homeowners buy a heat pump, they should consider the time well. To prevent loss of comfort it is recommended to choose the warm months for the expert advice, purchase, installation and commissioning. Because in this time the heating and hot water demand is very low.