re: Shop heating and cooling

This has enough horsepower compared to the 9K BTU heater I was using, I'd likely burn under 1/2 pound to get it from frosty to comfy.  Running it at 60K BTU, it went from 46° to 55° in 20 minutes.  Now I'm trying to figure out what scale I have that can accurately measure the net weight loss of the bottle.  I can calculate what it should be but measuring aways gives better data.