Have any of you used one of the Mr. Buddy Heaters? I found a few on clearance at the local wallyworld for 68.00. The box states that it is safe for indoors with a low oxygen shutoff and it is supposed to heat up to 200 sqft. Where I boat I rarely need much heat and when I do it is at night and we use an electric heater ran off my generator. My wife would like to have a little extra heat when cruising. Any suggestions on this heater. I know many of you use built in heaters but it is just not needed in my area.