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Groundwater heat pumps
The method of heat storage from groundwater is theoretically the most effective one (groundwater temperatures are constant and high throughout the year; on average 8-12°C). In practice, this possibility is applicable for few installations only, as both the quality and amount of water pose technical problems.
Groundwater is a source of stable heat; no additional heating is necessary in order to meet heat requirements.
Extreme caution has to be exercised with regard to:
- Source water quality (possible corrosion and exchanger fouling).
- The ability of the borehole to maintain constant water flows, as the water is not discharged in the same place.
- Remember that the water pump reduces the COP (heating factor) with its own consumption.
- Environmental hazard!: These systems have an uncertain future. European legislation has ever stricter requirements regarding installations which could disturb or deteriorate the quality of groundwater.