NRC711-DV-NG Noritz Indoor Direct Vent Natural Gas Residential Tankless Water Heater Our NRC711 series is perfect for homes with 1-3 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.
These units also offer several innovations : 
- 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.
 - Turbo Flow - Up to 7.1 GPM @ 35 degree temperature rise (6.3 GPM @ 45 degree rise).
 - 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. 
 
Specifications : 
- Indoor Unit Dimensions : 23.6" (H) x 13.8" (W) x 6.7" (D)
 - Gas Consumption : Min. 15,000 btuh Max. 157,000 btuh
 - Capacity Range : 0.5-7.1 Gal./min.
 - Energy Factor : 0.94
 - Temperature Settings : 115-140° F (in 5° F Intervals)