Bought a new small Hog Heater from Marine General late last year. Got it out a couple of weeks ago and it didn't stay lite. I followed all of their tips, but it still goes out after 5-10 minutes. Tried 1 lb tank, 20 lb tank with filter and still didn't stay lite. Called and e-mailed them weeks ago with no feedback. Needless to say no more hog heaters for me. Beware, they don't stand behind products they sell.
