THE WATER HEATER(S) SHALL BE RHEEM OPTIMA TWIN ELEMENT ELECTRIC MODEL No. 91230025 WITH AN HOURLY INPUT OF __kW AND AN HOURLY RECOVERY RATE OF ___LITRES THROUGH 50°C RISE. THE WATER HEATERS SHALL BE MANUFACTURED TO COMPLY WITH ALL NECESSARY NEW ZEALAND STANDARDS. THE WATER HEATER(S) SHALL BE FACTORY ASSEMBLED AND TESTED. MODELS SHALL BE MANUFACTURED WITH IMMERSION ELECTRIC HEATING UNITS FITTED WITH A SURFACE MOUNTED THERMOSTAT INCORPORATING A SAFETY OVER TEMPERATURE ENERGY CUT OUT. THE HEATER(S) SHALL BE INSULATED USING CFC FREE MATERIAL.