HPW Heat Pump Hot Water Systems are designed for all domestic water heating applications that utilise the high efficiency benefits of heat pump technology. The integral systems combine a hot water storage tank with an efficient heat pump that generates heat from ambient air by utilising the natural heat generating phenomenon of the gas evaporation/condensation cycle. This is transferred to the stored water by circulation through a coil type heat exchanger in the tank. Tank construction is carbon steel with internal enamel coating and a magnesium anode is fitted for cathodic protection against corrosion