Btw- for using a second UTH or CHE or something- we did consider it but the tub is quite tall(has a ton of floor space as well) and he utilizes the height with the sticks we have secured in, so a second UTH wouldn't effectively boost the ambient temps enough, I think. If it was a shorter tub then it would definitely work though.
And as you can see we already have to use foam on the sides! Chilly canadian basement haha. When winter sets in fully we basically surround the box in foam
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