Noritz 751 Tankless Water Heaters


Noritz 751 Tankless Water Heaters

With more power than any tankless water heater in its class, the NR98 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)

Dual flame burner - Noritz exclusive!  Minimizes temperature fluctuations.

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.


Natural Gas (NG)Propane (LP)
NR98-SVIndoor/Outdoor12yr/5yr parts/1yr labor0.830.83
NR98-ODOutdoor12yr/5yr parts/1yr labor0.820.86
NR98-DVCIndoor12yr/5yr parts/1yr labor0.820.84

*Energy Factor (EF) is a measurement of relative energy efficiency for a water heater; the higher the EF, the more energy efficient the water heater.


>> 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

>> QUALIFIES FOR UP TO $300 TAX CREDIT (2011 residential install only)
>> WARNING!!!  PVC cannot be used for venting.  Use only Category III (4" stainless steel venting). 

NR98-DVC requires 3" x 5" concentric-type stainless steel venting.


  • Isolation valves (#IK-WV-7-TH or #IK-WV-7-SW)
  • Outdoor vent cap (#VC-4-1) for NR98-SV model only.
  • Pipe cover (#PC-2S; for NR98-DV use #PC-3S; for NR98-DVC use #PC-5S)
  • Remote controller outdoor junction box (#RC-OJB)
  • ScaleShield (#SS-HB-1)
  • Quick-connect cable (#QC-1)
  • Recess box (#RB-700) for NR98-OD model only.
  • H2FLOW Anti-Scale System (#H2F