Same here..I use to let the water sit in there and then I had to clean it/and all the moisture was requiring me to just run my vent more.
Depending on where its located, maybe hook the drain up so that is flows through a series of metal pipes laid under a floor (20ft?) before it goes down the drain. I bet it would give up most of its heat if the run was long enough? Probably have to insulate it from below.
I wouldn't use a big tank. I could only imagine what that thing would look like inside after a year of showering...hair, scum, grim, dirt, sand... I'd think you'd have to clean it often or else it would start to really stink on you.
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