You should be good at this point. With the winterize valves closed, the water heater tank is isolated from the plumbing runs and antifreeze won't enter the tank. Flushing it was a wise decision that you'll appreciate next spring. Your plumbing should be "ready for winter"...
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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