was a sucker on this, didn't realize were the mini versions, apart from a line in the specs it wasn't noted and the picture was misleading. pretty disappointed on that end.
Otherwise the big overlooked aspect of these heaters is the gauge of the cord. Most space heaters have a cord about the gauge of a lamp, feel it after running just a few hours, they can get pretty warm.
I've been running an eden unit 24/7 in the winter in a central room with clockwise moving ceiling fan for several years. Coupled with reasonable electric and expensive heating oil it has more than paid for itself. Especially when the heat rises up through the house reducing the calls from a second zone.
Not everyone has the option of natural gas heat. Were it an option would jump ship from oil in a second.
Would a cheap heater do roughly the same as the eden in terms of efficiency when additional circulation is applied, absolutely. I've tested it (swapping heaters around on cold nights, temperature taken from various walls via infrared thermometer, variance 1-2 f) But theres no way i'd run a unit with a thin cord 24/7.
Situational electric heater justification math:
(my) Elec rate 14 cents per kw
Oil $3.50 or higher per gallon currently.
1 gal Oil = 140,000 btu
1kw = 3,400 btu
Oil furnace efficiency 70-80% in most situations ( am a licensed oil monkey, and gas monkey cert.) Good luck actually averaging the 85%+ claimed by modern units. Will use 75% for an easy realistic number accounting for older units.
Space heaters are near 100% efficient.
140,000 x .75 (est. furnace efficiency)
105,000 / 3,400 = 30.88 (round up)
31 kilowatts of electric heat to roughly equal the btu produced by one gallon of #2 heating oil.
In my case its 14 cents a killowat.
31 x $.14 = $4.34 for 105,000 btus
So on a direct btu comparison at .14/kw electric costs about 25% more than $3.50/gal oil.
However the electricity consumed by the furnace running as well as the efficiency of zone heating has not yet been factored, add in those and electric for a given situation can pull ahead.