For the use of renewable energies, surface waters are of great importance. Water is an excellent temperature store. For building sites near lakes, rivers or on the coast, this free-of-cost energy can be used to heat or to cool the building — independently of fossil fuels, protecting the environment, saving heating costs and reducing CO₂ emissions.

The water heat exchanger is specially designed to extract heat from the surrounding water. The compact, highly efficient heat exchanger extracts the energy required for heating from the water. In conjunction with a heat pump, the extracted energy is converted into thermal heat. The heat exchanger can also be used effectively for cooling the building. The convection openings in the surrounding housing and the optimised pipe routing ensure a high level of efficiency. All components are made of environmentally friendly, high-quality polyethylene, which guarantees a long service life. Low weight and attachment points on the housing allow quick and easy installation.

The closed circuit enables safe operation regardless of water quality — no contamination of the filters and no risk of corrosion in the water circuit as with open systems. In combination with a conventional geothermal heat pump, the energy is extracted from the water and supplied to the building; the heat or cold exchange takes place in the heat pump.

Extraction capacity: the possible extraction capacity of the WET depends on the ambient temperature of the water. Due to the three sizes, a good adaptation to the individual power requirement and the existing water depth is possible. For buildings with higher energy requirements, several WET units are simply connected in parallel and brought together via a FRANK distribution shaft.