Our NRC series is perfect for homes with 1-5 showers. When properly sized, they provide an endless supply of hot water to an entire home. With state-of-the-art gas combustion technology, Noritz burners maximize output and provide temperature stability while maintaining low emissions. Built-in features include safety lock-out, freeze protection, and high elevation adjustment. Safety lock out – Default max. 120 degrees (refer to owner’s manual for higher temp) Standard burner – High performance single flame burner. Fully modulating burner – Automatically adjusts burner level accordingly. Direct ignition – No standby pilot light. Thermal fuse – Automatic overheat protection system. Resin coated PC board – Increases durability and protection from elements. Automatic air regulator – Monitors internal temperature/maximizes burner efficiency.