I think that all the heaters mentioned are available in a size up to 25,000 to 30,000 BTU input. Southern Burner is a time tested greenhouse heater, but the others will work as well. I did not address the issue of vented vs non vented, but I think Ray is 100% correct to definitely use a vented heater. I do know some people who say that they have successfully used non vented heaters and I have tried it myself. Result - way too much water vapor produced and lots and lots of bud blast.
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