I have purchased a Modine HD75 propane heater. It can be wired to run at either high, medium or low speed. This unit outputs 60k btu’s. This is being installed in a 13x26 greenhouse that I want to maintain 65 degrees F over this winter. It should take approx. 30500 btu’s to heat this space. Which speed would you suggest to run this heater to be the most efficient with the propane? I’m trying to make my 500 gal. tank last as long as possible. Thanks
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