The AMBIHEAT HDc-270 Heat Pump is a smart, energy-efficient alternative for areas where a traditional solar water heater may not be suitable. This heat pump hot water system uses the heat from the surrounding air, to heat your water and provides a reliable, efficient and sustainable way to reduce your water heating energy consumption. They work all year round, day or night, in sunshine or rain and even on cooler days, as there is always heat in the atmosphere which can be used. Rheem Ambiheat HDc-270 Heat PumpH1825 x W690 x D720mmVitreous enamel cylinder7-year cylinder warrantySuitable for external installation only