With more power than any tankless water heater in its class, the NC1991 series is ideal for mid-size homes with up to 4 showers. Built-in features include safety lock-out, freeze protection, and high elevation adjustment. PVC CANNOT be used for venting.
These units offer several innovations:
Safety lock out - Default max. 120 degrees (refer to owner's manual for higher temp)
Fully modulating - Automatically adjusts burner level accordingly.
Turbo Flow - Up to 9.8 GPM @ 35 degree temperature rise (7.5 GPM @ 45 degree rise).
Quick Connect - Doubles the output by connecting two identical heaters.
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.
Commercial grade heat exchanger - 25% thicker piping than our competition.
>> Available in Natural Gas (NG) and Propane (LP) models only.
>> Temperature Settings: 100-180oF (14 options)
>> Thermal efficiency for all models: 84%
>> Self-diagnostic onboard computer system
>> Back-up battery compatible
>> Recirculation compatible
>> Digital remote included
>> WARNING!!! PVC cannot be used for venting. Use only Category III (4" stainless steel venting). N-0751M-DVC requires 3" x 5" concentric-type stainless steel venting.