SPRSUN air-to-water heat pumps, monoblocks, R290 propane-butane refrigerant, high-temperature. This series of heat pumps is equipped with a GRUNDFOS circulation pump, PANASONIC compressor and CAREL controller. The device is provided with a standard warranty for 24 months, and for an additional fee of 4% per year, the warranty can be extended till 5 years.