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Question, just looking at those pumps, did you use a fuse between the pump and the battery?
Wow! might try this modification on what we did. For my birthdays I like to go camping but I also love our Japanese bath so for a special birthday we did something like this but for heat we used an old Zoti water heater for use on propane camp stoves similar to this : http://www.hotcampshowers.com/inc/sdetail/484 by recycling the water through it and supplemented it with pots of water over the fire. Your way though you don't need to use a lot of propane so I like it better (although copper tubing is way pricey now). Either way though it was the best soak and we covered it with pool cover cut to fit and were able to use it again the next day (just wash first before you go in as with Japanese baths)
HillBilly Hot Tub - More Power!
HillBilly Hot Tub
Hot Tub Projects
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