... pump water heater,C02 air conditioner,CO2 heating unit,protection evironment heat pump CO2 water source heat ... pump water heater,C02 air conditioner,CO2 heating unit,protection evironment heat pumpCO2 water source heat ... rated input power 4kWrated input power18kWrefrigerantR744(CO2)heating capacity20.0kW14.5kW65.1kW46.6kWcooling capacity21.9kW16. ... heater,C02 air conditioner,CO2 heating unit