That is, I'm heating my house for the first time with my new Tarm. My wood, though seasoned, has some surface moisture and we struggled mightily at first to close the bypass damper without getting all kinds of smoke in the house. Finally, my plumber asked for a little fiberglass insulation to augment the gasket in the spot where the leakage was occurring, and we were able to close the damper, get the stack temp up a bit, and get the water to 160 or so, which is heating the house as I type. I've lived with wood heat partially or totally since 1969, but this is a whole new deal.