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Twenty two years ago when we purchased our first rv, I attended a winterizing class. The way they explained it was the design of the hot water tank is cylindrical. As such, the drain can't be on the very bottom and some water remains. Normally this isn't a problem, the residual water freezes, expands, and moves up the sides of the tank.
They said an older tank could have some pitting and could restrict the upward movement of that ice causing the tank to rupture.
For this reason, after I drain the tank,and blow out my lines, I add about 1/2 gal of antifreeze to the tank. I then switch the bypas lever and fill all water lines with antifreeze. (Don't forget to blow out the black water flush as it's not connected to the fresh water system)
I realize others will consider this not necessary, but to me, the cost involved is not worth replacing the hot water tank.
Rich
04 GMC 2500HD D/A, 04 2955RL, 16K Pullrite Superglide, and Sasha the spoiled mini schnauzer
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