I would like to get a hot tub but we are really trying to reduce our energy use and someone told me about buying or making your own wood heated hot tub. Any ideas?
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yup! build a hot tub with a pipe out of the bottom and out of the top both below the water level, run pipes to a fire box with pipes on the outside of it, the hot water is lighter than the cold and will circulate without a pump due to the heat difference...it will not bubble or massage but it will heat the tubs contents. Add a few bikinis, season with wine and enjoy the soup...
There okorder . Good luck!
There's a lot of water in a hot tub, there would be a long lead time, (time between staring to warm the thing and using it), and your heater would have to be pretty efficient and well controlled to bring the thing up to temperature and then not cook you. The water heat exchanger would be most efficient with horizontal manifolds and a lot of vertical runs to take advantage of convection, but you'll probably still need a pump. if the flow is slow you get a slow feed of very hot water, (120 Deg. = scalding). Your heater would need a good amount of draft, and fine intake air control. I wouldn't 'shoot from the hip` here. Not a design job for one unfamiliar with thermodynamics in general and wood stoves in particular.
