Oil filled heaters take to long to warm up, do not blow out any air, but instead are 'conductive and gravity flow' where they must exceed 120F to warm the air, thin it, and it will start flowing towards the ceiling. They are also bulky, and must cool off at least 20 minutes before putting it into the closet.
I have many of them at my work, and I hate them! I had to pick one up today and return it to the maintenance storage area, and it was well over 120F. I had to have a large cart to carry 4 of them.
The fan type that I have in my RV are much more compact, the outside only reaches say 95F, air blowing out is only around 120F max, and can be directed someplace, like the bathroom shower area. It will warm your feet as you leave the shower. You can use the fan without heat in the summer to cool off.. .
I had some fan type heaters that where more flat than upright, so they would not tip over. Centrifugal fan is very quiet, but they do not make them anymore.
So you want these features. Fan, thermostat, high and low heat settings. You can run two heaters on low or one on high and one on low when you are on a 30 amp service. If the battery is full, you can run 2 on low with a 20 amp circuit. The battery charger can use 3-5 amps if the batteries are very low.
I bought mine at Wal Mart for about $25. Oil filled heaters are so bulky that they can not be stolen from my work, I think that is the main reason they have so many, and that type is never stolen. The smaller ones seem to disappear. . .
Good luck,
Fred.
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