As long as you remove the water heater tank drain plug and completely drain it, no need to put antifreeze in the water heater as you would just be wasting antifreeze. The water heater bypass exists so no antifreeze is wasted entering the water heater when you run antifreeze thru the water lines assuming the owner completely empties the water heater via the drain plug.
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Tom and Lisa
Pennsylvania
2015 Challenger 37TB
2015 Ford Taurus toad
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