... -pump chiller is driven by high efficiency DC inverter twin rotary compressor, efficiencyis much higher than normal ... temperature controlling.We apply the latest new DC inverter technology with our air to water heat-pump ... -20C ambient temperature in winter.UTL R410a dc inverter air to water heat-pump produces hot water ... and installation.Capacity supply:3.5kw, 5.0kw, 7.0kw, 10.0kw, 12.0kw