When you winterize your water heater you should close the cold inlet and hot outlet valve then open the bypass valve between them. Next you need to remove the drain plug (usually made of plastic/nylon) and open the hot water faucets to allow all the water to drain from the water heater tank. There's no need to put any antifreeze in the water heater.
Glad the pictures were helpful!!
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2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.
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