Sorry don't know the answer but want to,too.
BTW Craig check your private messages please.
Lastly: you said;
"I hate to open this up for a major discussion, but what sealant should I use around the water heater flange/shell?"
What the Heck is wrong with major
They're the best kind, and isn't that what these forums are here for?
Your curiosity adds to my knowledge so thanks for asking...most anything!