... )CE,ISO9001,SGS,EN12975,SRCC,solar keymark 4)2%spare tube free Sunfield Solar Luxury air source heat pump ... able to be integrated with energy systems such as solar heater and boiler. Three different types are available in ... -16HAs/3. All hydraulic parts are located within the indoor unit. Water pump, expansion vessel, buffer tank and safety ... 4) Standard low temperature radiators 5) Thermal solar energy