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Air-to-water heat pumps are particularly suitable for existing buildings, as they can be retrofitted with relatively little effort. For example, no groundworks are required.

Air-to-water heat pumps can also use refrigerants with a low global warming potential. The aroTHERM plus, for example, uses propane (R290) as a refrigerant, which has a comparatively low global warming potential.

Together with our cooperation partner, we are particularly impressed by three aspects of the aroTHERM plus:

1. The refrigerant used, propane (R290), has a comparatively low global warming potential.

2. The heat pump is particularly suitable for existing buildings

3. The aroTHERM plus is one of the quietest heat pumps in its class.

The heat pump consultation is aimed at owners of:  

• Detached houses  

• Terraced houses  

• Semi-detached houses  

• Apartment buildings  

• Residential property owner associations

In many federal states, the state building regulations and noise protection requirements determine where a heat pump may be installed. This is particularly important for terraced houses.

We recommend speaking with your neighbours early on to address any potential concerns and, if necessary, to obtain their written consent. Of course, we will support you with regulatory requirements as part of our consultation.

Heat pumps can usually be retrofitted without any problems in existing buildings and can heat them efficiently. Precise planning is important in this regard. As part of our implementation package, we carry out a heating load calculation and a heating surface comparison for you. This allows us to determine whether your rooms will become pleasantly warm even at low flow temperatures (i.e. with little energy consumption). If not, it is often sufficient to replace individual radiators. Retrofitting or renovation is generally not an issue – except in extreme cases.

To install a heat pump, you need sufficient space: firstly for the outdoor unit, and then for the hot water storage tank, which is usually located inside the house, typically in the boiler room. There are also legal requirements regarding the outdoor unit, which we will of course take into account during your consultation.

After that, we will look at the technical requirements – for example, whether the flow temperature is suitable or whether it is necessary to replace individual radiators. We would also be happy to provide you with comprehensive advice on these matters.

With a photovoltaic system, you can save additional electricity costs by supplying part of your heat pump with self-generated solar power. If the heat pump is already installed, the PV system can be easily retrofitted. Ideally, you should also use an energy management system and a battery storage unit. This way, you won't have to rely on electricity from the grid at night or on cloudy days.