Rheem Gas Heavy Duty Water Heater Models 265 Litre and 275 Litre - Manual (Page 43)

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TEMPERATURE CONTROL
HOTTER WATER INCREASES THE RISK OF SCALD INJURY.
This water heater can deliver water at temperatures which can cause scalding.
It is necessary and we recommend that a temperature limiting device be fitted
between the water heater and the hot water outlets in any ablution and public
areas such as bathrooms, ensuites or public amenities, to reduce the risk of
scalding. The installing plumber may have a legal obligation to ensure the
installation of this water heater meets the delivery water temperature
requirements of AS/NZS 3500.4 so that scalding water temperatures are not
delivered to a bathroom, ensuite, or other ablution or public area.
RECIRCULATION SYSTEM
Where the installation involves close
temperature control for any purpose, or
the installation is providing water above
80°C, it is essential to install a circulating
pump. All valves and associated
equipment must be suitable for safe
operation up to the maximum thermal
discharge temperature of the temperature
pressure relief valve, i.e. 99°C.
Where water is required at a sanitising temperature of 82°C for dishwashing or
air conditioning applications, the following installation is strongly recommended:
1. A recirculation pump must be fitted.
2. The pump must be capable of withstanding working pressures greater than
1000 kPa and be constructed of materials corrosion resistant to hot water.
3. The pump should be installed with a full flow service valve on each side of
it.
4. A non-return valve should be fitted in the recirculation line to prevent back
flow of hot or cold water.
5. Length of branch lines off the main recirculation line should be kept to a
minimum.
6. The installation of gas, electric and water services must comply with all
relevant local Authorities’ regulations.
7. The cold water supply pressure or the setting of the pressure limiting valve
must not exceed the working pressure of the pump.