Need help finding a portable heater.

I am using an old (1986) Pelonis Disk Heater that has a variable speed fan & heating output. Set it for a temperature & it comes on at full wattage (1500) then, as the trailer warms up the fan & wattage drop. Usually, it gets almost silent & draws around 300 watts when the nighttime temperatures are in the 40's, although last night when it was in the 20's, it ran at about 1/2 speed & around 800 watts. Still much quieter than the furnace.

I believe they are still making a model that works the same - This one at Amazon looks like mine...