Use and Care Manual

43
The illustration is an example. Check with the actual Water Heater about the position of piping, and form.
8.2 Water Treatment
If this Water Heater will be installed in a location where the hardness of the supply water is high, scale Build-up
may cause damage to the Heat Exchanger.
Perform suggested treatment and maintenance measures to be taken based on the water hardness level
according to the below table.
Type of Water Hardness Level Treatment Device* Flush Frequency**
Soft
0-1 gpg
(0-17 mg/L)
None None
Slightly Hard
1-3 gpg
(17-51 mg/L)
Moderately Hard
3-7 gpg
(51-120 mg/L)
Scale Shield or
Water Softener
Once a Year***
Hard
7-10 gpg
(120-171 mg/L)
Very Hard
10-12 gpg
(171-200 mg/L)
Extremely Hard
> 12 gpg
(> 200 mg/L)
Treatment Guidelines
* 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.
NOTE
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 (200 mg/L) of hardness
• Poor water quality (See the Water Quality List on page 12.)
• The Remote Controller has displayed a “C1# (Service Reminder)” indicating Scale Build-up, but
the Heat Exchanger has not been flushed.
Water treatment device
• The water must be treated with either the Noritz Scale Shield or a water softener.
• 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 Scale Shield, contact Noritz America at
http://support.noritz.com/ or 1-866-766-7489.
Water Treatment System
City Water Supply
Pressure
Relief Valve
Hot Water to Fixtures
Shutoff Valve
Drain
Cold to Water
Heater
Optional Sediment
Filter
Water Treatment Device
Water Heater
Shutoff Valve
Connecting the Water Supply