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Heating a hot tub

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Hello everyone
Please advise
Is it possible to run the exhaust pipe of a mass heater from the barrel out side strait through the hot tub, in the water to warm it up?
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Location: latitude 47 N.W. montana zone 6A
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Hi Jack; Welcome to Permies!
Rmh's have been used to heat a hot tub before. So it can be done.  I have no direct experience with building one. (I used to own a snorkle heater for a hot tub)  Here is a link to an earlier post here at permie.
Heres another,  https://permies.com/t/69707/Engineered-Modular-Rocket-Stove-Hot
Searching the RMH forum may yield more posts.
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