I had two (2) Kerosene Salamanders heat the basement of a house of about that size when it was -67°F outside; and I think they were only 80,000 BTU apiece. But I only had to do the basement (until we could verify that the Boiler was going to work). I never left them unattended. What's the outside temperature that you're competing with ?
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Dale C. Hittle of GOLDEN RULE PROPERTIES in Glover, Vermont
Where We're Always Striving To Put Together "THE FAIR DEAL"