I really want something for weekends. Wood fuel means some planning ie 3-4 hours lead time. I can drain water when done, no pool chems or anything. I have a 200 gal propane tank I can incorporate into a waterjacket, cut and weld a firebox and flue into it. I'm trying to figure out how to have control over 2 environments, one dry and one water but both from 1 heat source.