I plan to bring my 5 gallon propane tank this weekend which should allow me to heat water with abandon - also going to bring along a portable propane fire pit to warm things up at the campsite. If we can scrounge dry wood we'll make a real fire as well but with the rain we're having we might not find enough dry wood. Sorry about the hi-jack of the thread - we were discussing electric space heaters.
I have thought that a small generator running the space heater at 750 watts would be a nice option while boondocking but I'm not sure it's worth the hassle to purchase and maintain the equipment for as infrequently as I'd use it.
I think years ago the West Marine cabin heater was mentioned. It's a lot more pricey than your typical big box ceramic heater but I can attest that it fits well into the lower shelf area and has been durable for me. I kept it on the floor of a cabin boat for several winters with the thermostat just above freezing. It's relatively quiet. Here is a link:
WEST MARINE Portable Cabin Heater | West Marine