Quote:
Originally Posted by bryanlaws
I guess the key phrase here is "if you don't drain it prior to freezing"? Did yours crack like after having drained it in freezing temps or is that while "full"?
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You are absolutely correct. I did not drain prior to freezing; it was full. This is the single wall unit before SMB realized they had a problem and before there was a way to drain it (without disabling your entire water system).
So, you know the drill- freeze/thaw = expansion and contraction and eventually you'll break it.
When I talked to the people at Flatplate when this whole fiasco started, they told me that I should absolutely not let water freeze inside it or it will break (like it did). They recommended that I replace it with a double wall "for more buffer" but they also said that a double wall will _also_ eventually break if you let water freeze in it, it'll just take longer.
So those of you with double wall units: You still gotta drain it and not let it freeze!