Whoever winterized our TL 213 did not know what they were doing. They put antifreeze in the fresh tank, where it doesn't belong, and left water in the water heater instead of draining it. When I drained the water heater and saw the water come out, I thought "oh oh, but at least it still is holding water, anyway".
I removed the fresh tank to get all of the pink stuff out. Not too bad a job. Then when I filled the tank and turned on the pump, water started coming out of the water heater somewhere. Fortunately I got it shut off before too much came out. I turned the AC on and am running a fan in the cabinet.
Jeesh. So I have to pull the water heater and weld or replace the tank. Well, I knew there were going to be issues.
From what I can see, these units are not meant to do the wet winterizing method. Not only would they need a siphon valve kit, but also a valve at the water heater.
I'm also very curious about the panel that apparently was once stapled in place to prevent access to the lower portion of the undersink cabinet. (Where the water heater is.) It says Not A Storage Area (or cabinet or something), and Low Point Drain. How did they expect the person to pull the drain???? I guess you could remove the drawers to the side and reach around. Not to mention it can be a perfectly safe storage area with just a little carpentry. RV builders do stuff that makes me crazy.