Shouldn't be any way to get leaves in a sealed crawlspace. I would never put the waterheater in there especially not gas. Main problem being all the heat the hheater looses warms the crawlspace and heats the house. We do everything we can to eliminate heat going into the house. Our WH is in the middle of the house. When I remodel that part it will be moved to the garage where it belongs and go back to gas.
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