If you have a water heater by pass for winterizing, you could use that valve. It's often labeled as such. Turning that handle so it's perpendicular to the water line will turn it off. Then you have to open the outside water heater cover and using a 1 1/8" socket remove the drain plug. As long as the one way valves on the heater work, that should shut it off. A simpler solution would be to turn on the hot faucet occasionally and run fresher water into the tank. You don't need to turn on the heat function, just run water through it.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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