Need to replace my gas hot water heater, and while I'm at it, replacing the storage tank as well. Have done some reading on here and understand it's pretty damn important to purge air from the water lines once done. There is a ball valve below the T that heads to the HWG. I assume I just need to fill both tanks, then close that ball valve and run a hot water faucet until no more air. That simple? Also need to look at the pump and see how to shut it down so the AC in the house keeps running but the pump doesn't while I have water shut down to it. I know there's either a dip switch or just hard wired (Tranquility 27).