Well, here is a lesson for anyone with a propane greenhouse heater. DOn't ignore those weird sounds. Turns out after I called the dude who works on electrical and gas in my greenhouse that the burners were partially clogged with soot, causing the gas to be released through the little openings in an irregular fashion, and causing gas to pool before the pilot lit it up. Causing basically a 'roll out' of flame inside the heater and a kind of miniature fireball explosion. Not good. Had to take the heater apart and take out and clean the burners(there are 9) and the pilot light orifice and igniter tip. Back to working normally. But could have potentially caused a lot of bad, bad trouble.
