Quote Originally Posted by Elizabeth Greene View Post
2. For replacing the zincs in a water heater, how do you get them out? Mine don't even budge with my biggest pipe wrench; The whole water heater rotates.
I can't speak to the heat pump water heaters. I'm in Canada and it doesn't make sense to cool your house a good part of the year. A bit of free air conditioning of your shop in Tennessee might make sense though.

The hot water tanks are usually pretty easy to spin, even when full. Do you have an impact that you can try to break it free? Also check the material. I don't think zinc is used. They're all pretty much aluminum, sometimes an aluminum/magnesium alloy, or just magnesium. Aluminum is not something you want in your water supply.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6550484/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6040147/

Edit: WmRMeyers beat me to it.