THE WATER HEATER(S) SHALL BE RHEEM HEAVY DUTY GAS MODEL No. A621265 WITH AN HOURLY GAS INPUT OF 110 MJ (NATURAL) AND A HOURLY RECOVERY RATE OF 426 LITRES THROUGH 50°C RISE. THE WATER HEATER(S) SHALL BE APPROVED NEW ZEALAND STANDARD NZS5262. THE WATER HEATER SHALL BE FACTORY ASSEMBLED AND TESTED. GAS CONTROLS SHALL INCORPORATE OVER TEMPERATURE ENERGY CUT OFF SWITCH AND A 100% SAFETY SHUT DOWN FAILURE CONTROL IN THE EVENT OF THE THERMOSTAT BECOMING INOPERATIVE. THE STORAGE CYLINDER SHALL BE INSULATED USING CFC FREE POLYURETHANE FOAM. THE DESIGN OF THE STORAGE CYLINDER SHALL INCORPORATE MULTI-FIN FLUE TECHNOLOGY WITH AN AUTOMATIC FLUE DAMPER FOR INCREASED THERMAL EFFICIENCY. THE WATER HEATER SHALL INCORPORATE HOT SURFACE IGNITION AND DIGITAL THERMOSTATS.