I have had two tank top propane heaters and both of them have had the same problem. A minute or so after it is started, it starts spitting and flaming around the top. I thought it was the propane liquifying but after bringing the 5 gallon tank inside for an hour it did it again. What do you think?

Heating & Cooling - Mr. Heater - Mr Heater Portable Buddy Propane Heater