Normal air to water heat-pump chiller just driven by fixed frequency compressor, but UTL R410A dc inverterair to water heat-pump chiller is driven by high efficiency DC inverter twin rotary compressor, efficiencyis much higher than normal chiller,plus high heating exchange rate of water/gas, especially in winter operation for hot water production, and with precise water temperature controlling.We apply the latest new DC inverter technology with our air to water heat-pump system.Our system is combinated with r410a dc inverter outdoor unit + indoor unit(with all the hydraulic kits and air to water high efficiency heating excahgne inside + the water tank with electrical heating element(optional)+the bluetech solar panel(optional)+solar water heater controller(optional)+the winter kits(optional) which could make unit running under -20C ambient temperature in winter.UTL R410a dc inverter air to water heat-pump produces hot water for sanitary using(55-60centigrade) or for floor-heating using(35-40centigrade),even in extremely cold winter.