The Kaisai heat pump is an ecological heating system that is expanding its group of supporters year after year. Its operation is based on drawing thermal energy from the natural environment (water, air or ground) and using it, by means of thermodynamic transformations, for heating or cooling the building as well as for production of hot municipal water. Therefore, the pump does not generate heat, but only transfers it from the lower source (surrounding the building) to the upper source (heating system). It can be used in single-family, multi-family or commercial buildings – in shops, offices or commercial premises. The Heat pump heating is currently the best heating available on the market.