as an old gasman, turn off house water,and set gas valve on pilot,you may have to remove cover to get to the gas valve or you have a new type with a electric switch and aplug in cord,just unplug.if you get a water leak in the piping with water shut off ,tank will still have water in it. but if you get a leak in the hot water tank you could get 40 gals of water below.most attic water heat. have a plastic pan under water heat to catch this water.........hope this helps
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