Gelled fuel

Anybody having trouble with DEF tanks freezing up and ruining the DEF heater? I know a guy in Fairbanks AK that left his truck out one night in -30 below and DEF froze. Cant get a heater for 2 months. The truck goes into limp mode. And he runs a business. I guess its a big problem and alot of people cant get heaters. Its not just Alaska. It gets -30 here in the states too.
 
My 2016 F250 def heater quit in 2020 but never went to limp mode, just threw CEL. I suppose if it went to cleaning exhaust filter it may have gone to limp then don't know. Ran it for a couple weeks till I had time to replace it.
 
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