Sounds strange--have never had a tank freeze up in the 11 years of using our Onan.
How about trying a light bulb in the tank compartment?
Can't help with the tank heater, but have seen them advertised.
Seems to me I have heard that this happens mostly when the propane has too much butane content--or maybe I just dreamed that.
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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