I have been using the Arctic Fox in-line warmer on my truck for 3 years. I use B100 bio-diesel in my truck year round and so I have an auxiliary fuel tank in the bed of my truck that also has an Arctic Fox tank warmer in it, so that I can use the B100 in the winter. I use the inline one to keep the bio-diesel warm coming from the truck bed tank, to the motor. They have been working flawlessly for three years, in temperatures as cold as 25 degrees below zero.
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