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INSTALLATION – WATER HEATER

MAINS WATER SUPPLY

Where the mains water supply pressure exceeds that shown in the table below, an approved pressure

limiting valve that does not have non return valve characteristics (such as an RMC PSL series valve) is

required and should be fitted as shown in the installation diagram (refer to page 52).

Model

018 - 026

Relief valve setting

1750 kPa

Max. mains supply pressure

1000 kPa

Min. mains supply pressure *

140 kPa

* minimum water supply pressure required to achieve the

rated flow and performance

Notes:

It is not recommended to install this water heater with a low pressure water supply.

A minimum water supply pressure of 140 kPa is required to achieve the rated flow and performance of

the water heater.

If this water heater is installed as a gas booster for a solar water heater, the maximum water supply

pressure to the solar preheat water heater, without an expansion control valve (ECV), is generally 800

kPa, however it may be less than this for some models. Refer to the Owner‟s Guide and Installation

Instructions supplied with the solar water heater for maximum mains supply pressure details.

This water heater is not suitable for connection to bore water or spring water unless a water treatment

device is fitted.

If sludge or foreign matter is present in the water supply, it is recommended a suitable filter be

incorporated in the cold water line to the water heater.

Refer to “Water Supplies” on page 72.

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