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* Isolation valves may be purchased as an
accessory from Noritz.
They allow for full diagnostic testing and easy
flushing 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
Water Intlet
Water Outlet
Drain
Hot Water
Service Valve
Pressure Relief Valve
Cold Water
Service Valve
(Ex. NRC661-DV)
Regular Maintenance-2
Water Quality and Maintenance
Damage to the water heater as a result
of poor water quality is not covered by
the Limited Warranty. To ensure full
warranty coverage, treat or condition
water that exceeds the target levels
provided in this table.
Source: EPA National Secondary Drinking Water
Regulations (40 CFR Part 143.3)
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.
For people who live in a hard water area. Periodical cleaning is necessary.
