Our house came with a built-in propane powered hot tub (they called it a spa). I was told T&D used the Bullfrog brand, but I don't see a label anywhere.
Having had the electric, always hot, kind of hot tub before I was dubious of the propane, heat it up and use it, approach, but we really love it. Plus, we can easily use it as a cold tub in the daytime, hot tub before bed.
It takes about 45 min in the winter to go from 60-ish water to 103 degrees. Much less time in the summer, but you do need to plan ahead a bit.
I have no idea how much they cost, but I'm sure it's more than the electric ones. One side benefit - it has given us a relatively cheap option to convert the kitchen stove to propane, as the spa heater is right outside the kitchen wall.
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