you are probably not the first to do this, nor the last. I assume you have a tank type hot water heater, and you probably have antifreeze in the tank now. I would drain the tank, leave the plug off, be sure it's bypassed, and then finish your winterizing chore. You will know when you drain the water tank if it's had antifreeze in it, it will be pink. In the spring be sure you rinse out the hot water tank thoroughly .. maybe several times. The issue is you don't want to have antifreeze in the tank when you turn on the tank heater or it will smell bad and taste bad and be a hard odor to remove. So rinse it out really good before you turn on the heater. When you pump antifreeze into your system, if you connect using the "winterize" settings, you would not run antifreeze into the fresh water tank, the water heater is bypassed (or at least will be now), and your antifreeze should only be going thru the water lines. Turn on the hot and cold valves one at a time, remembering to also to the outside shower if you have one, and also to run water/antifreeze thru the toilet. 2 gallons max should get the job done. It it takes more you are probably pumping antifreeze into a holding tank.
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