I'm familiar with insulation, etc., thanks. Any other thoughts on the topic? Two other reasons it appeals to me are that it avoids awkwardness and expense on the chimney, and stops pollution at the source. The hot water for a remote radiator solves another common problem. I'm wondering about efficient ways to control the fan and pump motors.
BTW, my house started out as a 2-room shack. Each extension was bigger than the last, and the third one even added indoor plumbing, getting to 700 sq. ft. Everyone was pretty keen to add insulation along the way, though.
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