For the purpose of making a hot tub, any style can suffice. The process of insulating will need to be adjusted if you go with a ridge free tub. To heat the water, we used a wood-fired thermosyphon ...

Heck, some are even using heat pumps to do the work as efficiently as possible. [HowToLou] got back to basics instead, with his simple wood-fired water ... re looking for a hot shower from your ...