Rheem Gas Heavy Duty Water Heater Models 265 Litre and 275 Litre User Manual

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 the gas supply pressure at the inlet to the water heater 

with the water heater and all other gas burning appliances in the premises 
operating (burners alight). The minimum gas supply pressures are: 
 
 

Natural Gas  1.13 kPa 

Propane 

2.75 kPa 

 

Town / TLP 

0.75 kPa 

Butane 

2.75 kPa 

 
If this minimum cannot be achieved, it may indicate the meter or the gas line to 
the water heater is undersized. It is important to ensure that an adequate gas 
supply pressure is available to the water heater when other gas burning 
appliances, on the same gas supply, are operating. 
 
TO TURN OFF THE WATER HEATER 
If it is necessary to turn off the water heater on completion of the installation, 
such as on a building site or where the premises is vacant, then: 
 

• 

Switch off the electrical supply at the isolating switch to the water heater(s). 

• 

Close the gas isolation valve(s) at the inlet to the gas control(s). 

• 

Close the cold water isolation valve on the cold water line to the water 
heater(s) to shut down the entire system, or; 

• 

Close the isolation valves on the cold and hot water branches to shut down 
an individual water heater in a bank.