The web-address for warmwatersource does not work. Is there another address ? or a brand name so I can do a further search.
I have been experimenting with building one myself. So-far I have had fair results. I am getting about a 25-30 degree at about 10 GPM, but with a 24' X 15' pool the temp didn't rise as fast as I would like. I have a few modifications to try (bigger chimney, an adjustable vent door to adjust draft (better combustion), brick lining to retain heat, and more copper in the firebox). Anyother ideas would be appreciated. I have all winter for modifications.