Noritz NR66 Review

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Find the main features and benefits of Noritz NR66 tankless water heaters. Why buying a Noritz water heater from NR66 series is a good choice?

Model NR66 is the tankless water heater designed for on-demand and endless water heating that serves up to two fixtures simultaneously, mainly residential applications such as bathrooms, kitchen or laundry. It can also be used in commercial applications with a lower hot water demand.


Noritz NR66 models

noritz tankless water heater nr66There are two models from NR66 series (old N-0531S) available, both power-vented: Noritz NR66-SV that can be installed indoor and outdoor and model Noritz NR66-OD which is designed for outdoor installations only. Noritz NR66-OD as the outdoor unit does not require venting and can also be used in manufactured or mobile homes.

Due to the high temperatures of flue gases, only Category 3 stainless steel venting is allowed for model NR66-SV indoor installation.


Modulating burner

Both NR66 models are equipped with the modulating, high performance gas burner that works in the range from its minimum power of 20,000 Btu/hr to the maximum 140,000 Btu/hr. Built-in automatic air regulator is another feature that helps gas burner to maximize its efficiency. This way water will be heated from its min. 100 F to max. 160 F.

Remote control for convenience

The water heater is factory set on 120 F and the best way to control the temperature of hot water is to buy a remote control. The remote control as the optional feature from Noritz, will not only allow you to set the temperature, but set a flow meter alarm and use the error code display system for easy troubleshooting. If the remote is not used, flashing light on the unit will indicate if there is a problem. Another reason is the inconvenience of changing the hot water temperature ("jumper clips" have to be used).

Energy Star compliance

High performing burner is designed to use propane or natural gas, and either fuel source you use the heater will heat water with an efficiency of up to 84%, which makes them Energy Star compliant.

Turbo Flow system

Turbo flow system allows up to 6.6 gallons per minute water flow when the heater is working with the 35 F temperature rise, and this is sufficient for one to two bathrooms, depending on the region where you live. The minimum water flow of 0.5 gpm gives you convenience where small water flow is required, such as hand washing or shaving. These small tankless water heaters are also recirculation compatible.

Safety devices

Noritz water heaters, NR66, are equipped with the safety features to prevent injuries, scalding water and reduce unit failure.

  • Flame rod.
  • Thermal fuse.
  • Overheat prevention system.
  • Freeze protection to - 30 F for an indoor and -4 F for outdoor models. This applies on the heater's internal plumbing.
  • Lighting protection device.
  • Fan rotation detector.
  • Resin coated PC board for protection and durability.


If models NR66 are used in the residential water heating, Noritz manufacturer provides 12-year limited warranty on the heat exchanger, 5 years on other components and one year on labor.


If you own an apartment, condominium or townhouse, and would like to enjoy an endless and on-demand hot water, Noritz NR66 is a solution for your water heating needs. Space saving and wall-mounted design make it ideal for small homes.

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Pictures - courtesy of Noritz company

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