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Water Treatment
If this water heater will be installed in an application where the supply water is hard, the water must be
treated with either the Noritz H2Flow or ScaleShield or a water softener. Refer to the below tables for
suggested treatment and maintenance measures to be taken based on the water hardness level. If this
water heater will be installed in an application where the supply water is hard, Scale Build-up may cause
damage to the Heat Exchanger. In this case, this water heater detects Scale Build-up in the Heat
Exchanger and then the error code "
code "
"* is displayed, the Heat Exchanger needs to be flushed to prevent damage from Scale Build-up.
Refer to the "Procedure for flushing the Heat Exchanger" on page 27 or contact Noritz America for more
information. (http://support.noritz.com/ or 866-766-7489)
*
= 1, 2, 3, 4, F
# = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
Damage to the water heater as a result of the items below is not covered by the Noritz America Limited
Warranty.
• Water in excess of 12 gpg (200mg/L) of hardness
• Poor water quality (See the Water Quality List on page 25.)
• The water heater has displayed a "
has not been flushed.
Note: Water softeners may be regulated by the local water jurisdiction, consult with the manufacturer for
code, sizing, and installation guidelines; the below diagram is for reference only. For more information
about H2Flow and ScaleShield, contact Noritz America at http://support.noritz.com/ or 866-766-7489.
Residential Use Treatment Guidelines
Type of Water Hardness Level Treatment Device*
0-1 gpg
Soft
(0-17 mg/L)
1-3 gpg
Slightly Hard
(17-51 mg/L)
3-7 gpg
Moderately
Hard
(51-120 mg/L)
7-10 gpg
Hard
(120-171 mg/L)
10-12 gpg
Very Hard
(171-200 mg/L)
Extremely
> 12 gpg
Hard
(> 200 mg/L)
Tankless Gas
Water Heater
Pressure
Relief
Valve
Drain
26
▲The illustration is an example. Please check with the actual water heater about the position of piping, and form.
" error code indicating Scale Build-up, but the heat exchanger
None
None
H2Flow or
ScaleShield
H2Flow or
ScaleShield
H2Flow or
Water Softener
H2Flow or
Water Softener
Water Treatment System
Cold to Water
Heater
Shutoff Valve
Hot Water to Fixtures
"* will flash on the Remote Controller. When the error
Flush Frequency**
None
None
Once a Year*** or
Flashing the error code****
Once a Year*** or
Flashing the error code****
Once a Year*** or
Flashing the error code****
Once a Year*** or
Flashing the error code****
Optional Sediment
Water Treatment Device
*
When selecting a treatment device, you must
consult with the device's spec sheet and
installation manual for guidelines and limitations.
Not all water supplies are compatible -
a water test may be required.
**
Install Noritz Isolation Valves to allow for flushing.
*** Flushing is required if a water treatment
device is not installed.
**** The error code "
" will be flashing in the
Display Window.
= 1, 2, 3, 4, F
# = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
Shutoff Valve
City Water Supply
Filter
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