THE WATER HEATER SHALL BE A RHEEM HEAT PUMP MODEL NO. A551310. THE WATER HEATER SHALL CONFORM TO AUSTRALIAN STANDARD AS2712. THE WATER HEATER SHALL BE FACTORY ASSEMBLED AND TESTED. MODELS SHALL BE MANUFACTURED WITH AN IMMERSION ELECTRIC HEATING UNIT FITTED WITH A SURFACE MOUNTED THERMOSTAT INCORPORATING A SAFETY OVER TEMPERATURE ENERGY CUT OUT. THE WATER HEATER SHALL BE INSULATED USING CFC-FREE MATERIAL. THE REFRIGERATION CIRCUIT SHALL UTILISE R134a GAS. THE CONDENSER COIL SHALL BE OF THE DOUBLE WALL PLATE TYPE.