Noritz Tankless Water Heaters Reviews

N-0631 (NR71) and N-0531
(NR66) models for indoor
and outdoor
use

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Noritz tankless water heaters, N-0631S (NR71) and N-0531S
(NR66) series that we are going to review here are gas appliances using
either natural or propane gas, recommended for smaller and middle size
homes, as they produce enough hot water for up to 3 applications
working at the same time.

Even without high class dual
flame burner and commercial grade heat
exchanger as other models, Noritz tankless water heaters N-0631S
(NR71)N-0531S
(NR66)
models are equipped with a powerful high performance single flame
burner that allows them to be and EnergyStar

With 12 options you can adjust the output hot water
temperature between
100 and 160 F (38 C - 71 C ). Factory set on 110 F (43 C) Noritz on
demand models are designed to prevent scalding water and burns.
For the most residential applications, like dishwashing or shower,
recommended hot water temperature is below 120 F (49 C).

Temperature of the exhaust gases is high and
as there is a lot of
moisture they tend to produce an acid compound that can
corrode the
flue. That is the reason for installing a stainless steel
exhaust.
recognized.

Main Features - Summary

• Efficiency level is 83% for both natural
  gas and LP

• Single flame burner

• Modulating gas valve for automatically burner output
  adjustment

• Turbo
  Flow system for high demand applications

• Electronic ignition

• Self diagnostic on board computer system, great for
  troubleshooting and repairs

• Suitable for installations up to 4500 ft or 1.5 km
  above sea level

Safety
Elements

• Thermal fuse provides an
  automatic protection from overheating

• Freeze-prevention heater works automatically if power
  is provided

• Flame rod

• Safety lock-out

• Lightning prevention device

• Fan rotation detector

• Resin coated PC board for element protection

• Automatic air regulator monitors an internal
  temperature

Useful
Accessories

• Isolation valves with pressure relief valve - allows
  easy flushing and full diagnostic testing.

• ScaleShield
  is Noritz brand water softener protects
  from lime and mineral build up.

• Recess box for N-0631S-OD (NR71-OD) and N-0531S-OD
  (NR66-OD) models only

• Outdoor vent cap for N-0631S (NR71) and N-0531S
  (NR66) models

• Remote controller

• Remote controller outdoor junction box, necessary
  when installing outdoor

• High elevation adjustment

N-0631S (NR71) and N-0531S (NR66) in Details

On
demand water heaters, N-0631S (NR71)
series, with a maximum power of 180,000 BTU and with the capacity range
from 0.5-7.1 GPM, are ideal for one to three bathroom homes.
They can be easily installed indoor
and outdoor. When installing inside, you can run
vent either horizontally or vertically.

Sufficient air supply is required and since models are power
vented,
products of combustion are extracted out through the vent pipe while
the inside air is sucked in through the perforated front cover.

N-0631S-OD
(NR71-OD) and N-0631S
(NR71-SV), for
outdoor installation, are using horizontal vent that is built
into the water heater so there is no requirement for any venting
elements. The outside air is used for combustion (exhaust and air
intake slots are located on the front cover).

For N-0631S (NR71) models only, if there is any problem with a
water
heater,
the error code will show up on the lamp.

Noritz water heaters N-0531S
(NR66) models,
because of its small
size, max. capacity of 6.6 gallons of hot water and 140,000 BTU per
hour are perfect for apartments, condominiums and
townhouses that are using up to 2 showers.

(Photos courtesy of Noritz)