Derek;
...in the first pix you posted, the rust stains certainly suggest there was a standing pool in the bottom of the enclosure due to a failure to drain (probably due to biomass blocking the path).
Compliments on the Heater Enclosure restoration and additional pictures...I started putting my notes together, but with that great selection of pix showing details, I'll definitely have to expand my notes, so this will take a bit more time.
Thanks as always for the kind remarks and reference!
Cheers
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