Noritz Tankless Water quality limits
Noritz Tankless Water quality limits: reference table for the tankless water heater (Noritz EZ, Noritz NRCR series): a quick-reference table with notes.
Noritz Tankless Water quality limits table
| Contaminant | Max allowed |
|---|---|
| Total hardness | 200 mg/L (12 gpg) |
| Aluminum | 0.05 to 0.2 mg/L |
| Chloride | 250 mg/L |
| Copper | 1.0 mg/L |
| Iron | 0.3 mg/L |
| Manganese | 0.05 mg/L |
| pH | 6.5-8.5 |
| Total dissolved solids | 500 mg/L |
| Zinc | 5 mg/L |
| Sulfate | 250 mg/L |
| Residual chlorine | 4 mg/L |
How to use the Noritz Tankless Water quality limits table
Find your exact model in the first column and read across the row. Values in the Noritz Tankless Water quality limits table are a summary for quick reference; the rating plate on the unit and the manufacturer's manual for your model always decide. If your model is not listed, or a value looks different from what you see on the unit, check the manual before changing anything.
Notes
- Damage from water above these levels, or from ignoring a C1# descaling reminder, is not covered by warranty.
- Hardness and residual chlorine limits are Noritz suggestions; the rest are EPA secondary standards.
Applies to: Noritz EZ111/EZ98/EZ71 and NRCR111/NRCR92
Noritz models this applies to
Noritz EZ
Noritz NRCR
Noritz Tankless Water Heater error codes →
Source: Noritz EZ/NRCR Owner's Guide (Rev. 10-25), Water quality and maintenance, p.28. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.