Ravialdo wrote:
Road Less Traveled mentioned ceramic heaters. Those obviously have an electric draw but am I correct to assume they wouldn't drain my batteries they way the furnace blower would?
No, the ceramic heaters are ~1000-1500W at 120V, quick mental figuring at 1000w = 8 amps at 120v or 80amps at 12V, add in the loss for the inverter if boondocking and your batteries will be completely dead in a couple of hours. Furnace blower takes a couple of amps of 12v. Resistance heating and boondocking don't play well together.
If plugged in it's a moot point of course, but then you're in a situation much like a commercial campground.