They'll know you've got heating because when you're on cb there'll be a background noise of "ffffoooooooooooommmmmm" whenever you speak!
Definitely the best way of heating though, they're awesome, instant heat and very very good, AND you don't need the engine to be warm
I doubt you'll here the "fffffrrrrrooooooommmmm" over the "brrummmmmmmm" of the engine!
