THE WATER HEATER(S) SHALL BE RHEEM OPTIMA ELECTRIC MODEL No. A46240088 WITH AN HOURLY INPUT OF __kW AND AN HOURLY RECOVERY RATE OF ___LITRES THROUGH 50°C RISE. THE WATER HEATERS SHALL CONFORM TO AUSTRALIAN STANDARD 1056. THE WATER HEATERS SHALL BE FACTORY ASSEMBLED AND TESTED. MODELS SHALL BE MANUFACTURED WITH IMMERSION ELECTRIC HEATING UNITS FITTED WITH A USER ADJUSTABLE SURFACE MOUNTED THERMOSTAT INCORPORATING A SAFETY OVER TEMPERATURE ENERGY CUT OUT. THE HEATER(S) SHALL BE INSULATED USING CFC FREE MATERIAL. THE CYLINDER SHALL HAVE A 10 YEAR WARRANTY AGAINST LEAKAGE.