Rheem Stellar 850330 Owner's Manual And Installation Instructions page 35

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:

Shut down the gas control (refer to "Close Down Procedure" on page 38).

Close the gas isolation valve at the inlet to the gas control.

Close the cold water isolation valve at the inlet to the water heater.
35
COMMISSIONING