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How does it get access to the bottom of the tank? Is that where the drain valve would usually be?

Mark is a good guy to have around.

I think the gravity systems only work when the WH is below the level of all of the outlets on that system. Correct?

I’d run it by him first. I’m sure he’s run into this before. He’s not likely to do anything not covered by code. My understanding is that a heat trap is not to be used with recirc systems but he will...