I use a Northern Tool Single Burner hotplate hooked up to the standard 20 lb Propane tank. Have not smoked anything in a bit, but hooked up today to smoke a couple chucks and some ribs. Started up and ran building up temp. Came out later to a cold smoker. Hmm, flame went out. Seems like enough propane in tank, so I relight. Come out 40 minutes later and find flame out again. It is 90 degrees out with little to no wind. I decide to grab the tank from my Propane grill. It is newly filled. Heat build up and I see smoke from the wood. I go out 25 minutes later and see the flame is again out. Well I guess it just has to be the regulator? What else can it be? I found a spare and have it hooked up now, but will I find the flame out again?