Forgot to add (getting old and forgetful), when you remove the top outside cover, look at the top of the boiler stack and you'll see a wire sticking up, clipped into a sheet metal securing clip. Pop it out and pull the baffle out and put it back in and pull it out..couple times.
Then clean the carbon off the baffle and vacuum up all the carbon and **** that has fallen from the tube the baffle is in. You need the chamber clean for the burner to heat the boiler properly and they all get carboned up after a while.
Working better on 110 than propane tells me the chimney tube is carboned up. Propane runs hotter than the 110 volt heating element, but the element is in next to the boiler tube and protected from the flame.
