Rheem 311 Series Owner's Manual And Installation Instructions page 23

The water heater must be located to ensure that the location of the flue terminal
complies with the requirements of AS 5601 or AS/NZS 5601.1, as applicable
under local regulations. As a guide the following requirements are extracted
from the Gas Installations Standard. The distances are measured along the
wall behind the water heater.
At least 300 mm between the top of the flue terminal and the eaves.
At least 500 mm between the
flue terminal and the edge of any
opening into the building, such
as an openable door or window,
measured horizontally*
vertically.
At least 500 mm between the
flue terminal and a return wall or
external corner,
horizontally*.
At least 500 mm clear of any
combustibles.
Note: * If these horizontal distances cannot be achieved, AS/NZS 5601.1
states an equivalent horizontal distance measured diagonally from the nearest
discharge point of the flue terminal to the opening may be deemed to comply.
Check with the local regulator.
SAFE TRAY
Where damage to property can occur in the event of the water heater leaking,
the water heater must be installed in a safe tray. Construction, installation and
draining of a safe tray must comply with AS/NZS 3500.4 and all local codes
and regulatory authority requirements.
MAINS WATER SUPPLY
Where the mains water supply pressure exceeds that shown in the table below,
an approved pressure limiting valve is required and should be fitted as shown
in the installation diagram
Model
Relief valve setting
Expansion control valve setting *
Max. mains supply pressure
With expansion control valve
Without expansion control valve
* Expansion control valve not supplied with the water heater.
and
measured
(refer to diagram on page
090 – 170
1400 kPa
1200 kPa
960 kPa
1120 kPa
23
INSTALLATION
30).