WATER/WATER HEAT PUMP – EVERYTHING YOU NEED TO KNOW 

A water/water system is based on using groundwater heat. Two wells are drilled into the ground: a submersible pump in the first well draws groundwater through the heat pump, where heat (or cooling) is extracted. The water is then returned to the groundwater through the second well, located 15–20 m away. The water temperature changes by 2 to 4 °C in this process. 

You need to obtain a water permit and carry out a prior chemical water analysis. It is also essential to ensure that the water quantity is sufficient for continuous operation during peak heat demand — this will be checked with the help of a specialist. 

Due to the constant temperature of groundwater and the density of water as a medium, the water/water heat pump is extremely efficient. The seasonal coefficient of performance (SCOP) of modern heat pumps such as the KRONOTERM ETERA can exceed 8, meaning the device generates 8 kW of thermal energy for every kilowatt of electricity required for operation — more than any other source. 

• Highest efficiency: SCOP exceeding 8 (ETERA reaches 8.48) – the highest among all heat sources. 

• Lifetime investment and added property value, as the well lasts for generations. 

• Stable operation all year round – independent of weather due to constant source temperature. 

• Long service life and minimal maintenance. 

• No outdoor unit – quiet and discreet system. 

• Two wells – extraction and return, at least 15–20 m apart. 

• Water permit – process includes water analysis and pumping approval. 

• Sufficient groundwater quantity – for operation even at peak loads. 

• System protection – recommended installation of water filter, balancing valve, and intermediate heat exchanger (PIL), protecting the heat pump and entire system. 

The investment is higher than for air/water heat pumps, but due to significantly lower energy consumption and the longest service life, costs are recovered quickly — then you enjoy comfort with incredibly low bills. The highest national subsidies are often also available to ease the initial investment. 

A water/water heat pump is the ideal choice for: 

• users with access to groundwater and sufficient quantity, 

• investors seeking top energy efficiency and lowest consumption, 

• users wanting a long-term, sustainable, and eco-friendly solution, 

• large consumers where efficiency brings even greater savings. 

If you are considering installing a water/water heat pump or want to learn more, we will gladly advise you. Contact us and see if this solution is right for your home or building.