Finding such a thing on the web was not easy. There are only a few available and I was only able to find one that sits outside the water There are "hot tub" wood-fired water heaters that sit completely in the water except for the smoke stack and wood feeding box but I didn't want to sacrifice any of my pool for this as it's already too small, and I didn't want the mess around the pool either.
So I called the guys at ExtendaSwim - the only other manufacturer I could find - and ordered one.
The individual taking my call suggested I order the middle sized heater even though the smallest heater was more appropriate for my pool. Apparently they were doing a redesign of the smallest one and the delivery time would have been fairly long. I followed his advice but more because the wood I have is partially in large pieces, and also because I wanted to be able to heat quickly and shut it down. I live in a typical subdivision of smallish lots and I was (and still am) concerned about the effects of smoke in the neighborhood.
Very informative. Im from a farming background with access to alot of free wood that i just need to cut. I would like to know how your heater has preformed now after a longer time, what other issues you have had with it, weather you have changed anything like your posts talked about. I have done some more looking around and have come across this company http://www.woodstovepools.com/contact-us.html was it avalible when you looked for your heater? with reading this post and the info on that site it seems to have covered the changes that you wish you could have done on yours.....
any info you could give would be greatly appreciated