Groundwater Heat Pump in a Single-Family Home
There is a large groundwater reserve of extremely high quality in the Aare Valley, between Thun and Bern. Part of the Münsingen community is built on this groundwater area. One neighbourhood in this community features a single-family home that uses the energy from this groundwater for heating.
There is groundwater flowing underneath the house, at a temperature of 9-12°C. It is used for heating and hot water production, by means of a heat pump.
A large groundwater reserve
The Aare Valley owes its shape to deposits from the River Aare during the last ice age. The geological layers of sand, gravel and crushed stone are permeable, which allows groundwater of excellent quality to accumulate here. People here are thus making maximum use of the groundwater - including for heating. Certain neighbourhoods of the Münsingen community are built on these groundwater reserves. Using a groundwater heat pump for heating therefore makes a lot of sense.A shared well with individual heat pumps
The Münsingen community aims to ensure that this groundwater is used sustainably. For example, its building regulations list shared groundwater wells as an objective. New systems should anticipate neighbours’ requirements and allow for simultaneous or subsequent use. These extraction and return wells are drilled at a distance of at least 12 metres from each other. Approximately 3 to 4 degrees of heat are extracted from the water. The heat pump brings this heat to a higher temperature level for heating purposes.
The Optiheat Inverta TWW groundwater heat pump with an integrated boiler is compact and saves space.
3-in-1 Heat Pump Design
The building owner chose the Optiheat Inverta TWW heat pump for its performance and because it combines everything in one unit: the hot water tank, the heat pump and the free cooling function, which allows for easy cooling in summer. The boiler can hold 220 litres and has an output capacity of 310 litres at 40°C. This matches the residents’ requirements.The heat pump in use
Barely audible (29 dB(A) at 1m)
Space-saving all-in-one unit
Heating, cooling and hot water in one
Heating output range (product range) of 2 to 9 kW
Efficient solution where groundwater is available
Groundwater heat pumps are very efficient during operation, as the temperature of the groundwater remains constantly high throughout the year. However, this type of heat pump can only be installed in certain areas of Switzerland. The GIS maps of the cantons show the existing groundwater reserves. If you have one on your property, you must clarify with your canton whether you can use it. The water quality, the flow rate and the usage regulations are all factors that need to be considered. Once these requirements have been met, the construction work can begin: Two wells are drilled down into the groundwater layer a certain distance apart. One well is used for extracting water, and the other for returning it. The heat pump itself is installed inside the house.
In safe hands
Choosing a CTA heat pump means opting for a high-quality, durable product. Even though heat pumps are generally considered low-maintenance, regular servicing and checks are required to maintain their perfect and low-cost performance in the long run. For newly installed heat pumps, experts recommend taking out our «CTAplus» extended warranty. This comprehensive protection offers cover for up to 12 years after commissioning. Alternatively, or even after your «CTAplus» expires, we offer a flat-rate service contract for all heat pumps. We are a family-run Swiss company with production facilities in Switzerland.
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