Rheem 300 series - Manual (Page 27)

LIGHTING THE WATER HEATER
27
CLOSE DOWN PROCEDURE
1. Turn the gas control knob to the
“ ·” position (pilot). This setting will
leave the pilot flame alight however
the main burner will not be able to
light.
2. Turn the gas control knob to the
" z" (off) position. This setting shuts
the gas control down completely.