• Hot surface ignition (HSI) which removes the need for a pilot light, lowers operating costs and makes Rheem more reliable. There’s also a 100% flame failure control built in

• Multi-fin flue tube technology for ultra high performance, providing greater thermal input and better thermal efficiency in less space

• Flue damper (on the 621 275) to close off the primary flue when the burner is not operating, reducing maintenance rates by up to 60% when compared to Australian Gas Association maximum allowance

Electronic thermostat providing fine temperature control with digital setting display

•Room-sealed fluing option eliminates the need for fan assistance or mechanical ventilation, and power flue terminal connections simplify wiring

• A bank of 8×621 275 or 631 275 Rheem commercial gas water heaters can deliver 7720 litres of hot water in the first hour