Now I've wondered about getting a galvanized tank for a tub because the fiberglass tubs in this mobile home do not keep any water warm for any length of time. I thought maybe this new configuration of the knobs and faucet/s coming out of the wall over the tub or sink...
We have some acquaintances who have a stock tank for their bathtub for years. She didn't want to pay the high prices for a bathtub so she put in a stock tank. I've never seen it myself but they love it!
In the heat of summer, I use the rubbermaid stock tank for cooling off-my only gripe would be that the sides are too straight to lounge comfortably and read a book. When we lived on a sailboat my husband built a Japanese style tub from marine ply and epoxy-this worked very well, never leaked in 6 years and was a good storage area. Perhaps you could make your own custom tub in a similar way. Many sites on-line about doing epoxy work. Liese, Piedmont region, NC
Things we use the stock tank for: Watering the cattle and horses, swimming pool, reast area for copper heads and rattle snakes, and a nice place to stop on the way to the house and stick your head under to cool off a little. Something else we use it for is to leave catfish in for a week or so till they loose some of the strong taste they aquire from living in the Deep Fork River.
I used to jump in the stock tank on really hot days, usaully after stringing fence, or spending an hour or two running down the steer that broke through the fence that I didn't re-string. It was nice. Deep enough to sink in to your nose.
I don't know that I've seen a lot of insulated bathtubs. Maybe one of those fancy whirlpool models, but my too small tub is definitely not insulated. Just covered with porcelain.
Yes it would take a LOT of water to fill...BUT to be honest an actual bath would be a treat more than a regular occurrence.It could of course be a little shorter as it is a lot deeper than a 'normal' tub.
How about a wood fired stock tank bathtub? Maybe something with copper coils mounted in a firebox? I wouldn't want it for a primary bathing set-up, but for the occasional relaxing soak, it would be pretty nice...