Water Treatment System - Noritz ecoTOUGH NRC98-DV-NG Installation Manual

Condensing tankless gas

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Owner's manual (32 pages)

Owner's manual (32 pages)

Table Of Contents

Table of Contents

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. Dam-

age to the water heater as a result of water in excess of 12 gpg (200 mg/L) of hardness is not covered

by the Noritz America Limited Warranty.

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 informa-

tion about H2Flow and ScaleShield, contact Noritz America at 866-766-7489.

Residential Use Treatment Guidelines

Hardness

Type of Water

Level

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)

10-14 gpg

Very Hard

(171-239 mg/L)

Extremely

> 14 gpg

Hard

(> 239 mg/L)

* Install Noritz Isolation Valves to allow for flushing.

** Flushing is required if a water treatment device is not installed.

NORITZ

Condensing

Tankless Gas

Water Heater

Pressure

Relief

Valve

Drain

Treatment

Flush

Device

Frequency*

None

H2Flow or

Once a Year**

ScaleShield

H2Flow or

Once a Year**

ScaleShield

Treatment

H2Flow

Required

Treatment

H2Flow

Required