You can believe and use any hose you want to, but I can tell you that "propane" hose is expensive, and plain **** when compare to other type hoses.
I used to plumb the heaters w/ nothing but automotive fuel injection hose, which is a much higher grade of hose, 14 yrs, and no deterioration whatsoever.
I then did some research on the cheap clear vinyl hose at any hardware store, and found it to be indestructible to any gas or liquid, acids etc etc.
I used a total of 15 feet of 1/4" to plumb my Cat heaters in my current MH.
Its been 5 years now, no deterioration whatsoever. I used quality 1/8" pipe barbed fittings w/ 3 quality zip ties on each end,......not ever a problem.
