Hi...this is what I did, I put a inline temp guage in, My return water is 12 degrees cooler, I can put wood in the boiler and It will not build up to temp, I can leave the door open on the stove and It will build 30 degrees in a half hour, I check the flap on the draft and its opening and closing, like it should, and I insulated my pipes and put them in a 4 inch pcv pipe.
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