Posted by Pierre on February 6, 2013 
Interesting picture. I would like to know what would happen if some propane tanker was parked over a switch heater like this for a long time. I'm pretty sure that somebody tought about that.
Posted by Ronald Allsbury on February 7, 2013 
They ars a some of a gun to find when the snow is above them have to clean then light them. They have automatic snow dectors on them.
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