We use a couple of ceramic heaters in ours and in the bathroom I bought a TINY little ceramic heater "My Heat" from Target, 5 1/2 inch square, opened the cabinet door under the sink so heat can go down into the pass through basement storage area.
Those tiny little heaters will surprise you...they put out a LOT of heat for such a small appliance.
If the temps drop down into the low twenties/high teens we've been known to turn the fireplace on low.
Edited to note: our 5er sits in the back yard on shore power, so we're able to check on it often.
If age is a state of mind, and I've lost my mind, I'm AGELESS, right?
Give me 40 acres and I'll turn this rig around:
Flagstaff 5er 2014 8528 IKWS
, Platinum Package, Regency Interior "Buffy"
F250 Super Duty 2013
Tuxedo Black "Biff"
Days camped 2014