Noritz Water Heater

NCC1991 OD Outdoor Tankless Water Heater

Noritz’s most efficient commercial tankless heaters, the next generation in tankless technology – condensing heaters. NCC1991 is the new LowNOx version of NCC199. This innovation utilizes a dual heat exchanger, a fusion of stainless steel and copper heat exchangers. The 100% stainless steel component captures the residual heat from the exhaust temperature to preheat the incoming water before it runs through the main copper heat exchanger. This results in dramatic reduction of carbon dioxide and increases the heater’s efficiency level to over 93%! Another benefit of this technology is lower exhaust temperatures, which means less costly PVC can be used for its venting.


Product Features

Technical Specifications

These units offer several innovations:

Safety lock out

– Default max. 120 degrees (refer to owner’s manual for higher temp)

Dual flame burner

– Noritz exclusive! Minimizes temperature fluctuations.

Fully modulating burner

– 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.

Indoor Unit Dimensions

- 24.2” (H) x 18.3” (W) x 9.4” (D)


- 66 lbs

Gas Consumption

- Max: 199,900 btuh

- Min: 16,000 btuh

(NG & LP)

- Natural Gas/Propane

Energy Factor

- LP: .97 NG: .95

Temperature Settings

- 100-150° F (in 5° F Intervals) 160° F 170° F 185° F