Noritz NRC663 (EZTR40) Review

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An overview of the Noritz NRC663 tankless water heater, also known as Noritz EZTR40; features, specifications, benefits, where to use, installation tips.

Features and benefits

Condensing technology

Noritz NRC663, also known as EZTR40Noritz NRC663-FSV, also known as Noritz EZTR40 is the small tankless water heater that uses the condensing technology for the on demand, high efficiency water heating in residential applications.

Due to its maximum gas input of 120,000 Btu and hot water flow of 6.6 gallons per minute, EZTR40 is recommended for smaller houses, apartments, cabins, cottages, apartments and offices, in regions with the warmer climate, covering up to 2 baths with continuous supply of hot water.


These water heaters can utilize both natural and propane gas, which allows usage in cabins and cottages where the natural gas is not accessible while the propane can be delivered. With the appropriate setup, EZTR40 can also be installed in the higher elevation (mountains).


EZTR40 model is an indoor, power-vented unit that utilize an electric fan to blow the gases out, through the 2" flexible pipe.Through the air filter and provided slots at the front cover, water heater gets the indoor air for the gas combustion.

Noritz EZTR40 offers a new approach in tankless water heater installation; top mount water connections and convenient venting directly through the existing 3" and 4" B-vent. This set-up allows faster installation making them ideal for retro fits as a replacement for the existing storage tank-type water heaters, using the same gas, water and vent lines. Due to its low NOx gas emission in can be used in countries that have strict laws for pollution and emission of green-house gases.


EZTR40 has the ability, through the modulating gas valve, to operate in the power range from 15,000 to 120,000 Btu while still providing great energy efficiency of 0.91 (for both gas type), which guarantees reduced energy usage and decent savings.

Compact size

EZTR40 is a very small wall-mount unit: 27.2" x 18.3" x 9.4" in size and only 50 lbs in weight, making them ideal for installation in places that lacks in floor space, laundries and bathrooms, for example.


As other Noritz tankless water heaters, EZTR40 is a reliable and safe unit, it is equipped with several safety devices and the display window that shows the numerical error code in a case of the failure. This small and simple display also shows the temperature and the operating status, and it is built-in at the front of the unit. If you need more convenience and more temperature settings, a remote controller is offered as an option.


Noritz NRC663 comes with the standard 12-year warranty on the heat exchanger and 5-year on other elements, when used in residential water heating. For commercial usage, the warranty is shorter.

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