Use and Care Manual

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* Isolation valves may be purchased as an
accessory from an authorized Noritz wholesaler.
They allow for full diagnostic testing and easy
ushing of the system.
* The kit includes two full port isolation valves
and a pressure relief valve for the hot side.
Contact Noritz for more information.
Isolation Valves
For people who live in a hard water area, periodical ushing is necessary.
If the Heat Exchanger is not ushed, Scale Build-up may cause damage to the Heat Exchanger.
When the Heat Exchanger needs to be ushed to prevent damage from Scale Build-up.
Contact Noritz America for more information about ushing the Heat Exchanger.
(http://support.noritz.com/ or 866-766-7489)
Total Hardness** : 200 mg/L (12 gpg) or less
Aluminum : 0.05 to 0.2 mg/L or less
Chloride : 250 mg/L or less
Copper : 1 mg/L or less
Iron : 0.3 mg/L or less
Manganese : 0.05 mg/L or less
pH : 6.5 - 8.5
Total Dissolved Solids : 500 mg/L or less
Zinc : 5 mg/L or less
Sulfate ion : 250 mg/L or less
Residual chlorine : 4 mg/L or less
** Maximum limit suggested by Noritz.
Damage to the Combi Boiler as a result of below is not covered by the Noritz America Limited Warranty.
To ensure full warranty coverage, treat or condition water that exceeds the target levels provided in this table.
- Hard water
- Poor water quality (See the below list.)
Source: EPA National Secondary Drinking Water Regulations (40 CFR Part 143.3)
Water Quality and Maintenance
Pressure Relief Valve (DHW)
Domestic Hot Water Service Valve
Domestic Cold Water Service Valve
Domestic Cold Water Inlet
Domestic Hot Water Outlet
Drain