What is the most cost-efficient space heater on the market?
I would choose the electric heater that works the best for your appplication. The method of the heater is more important than the efficiency. Electric heat is inherently efficient in the sense that for each $ of electricity they all produce the same amount of heat (within a very narrow range at least) So, for some applications you need a fan forced unit, for other apps an infrared unit… and for other apps a radiator style. It would be best to have in mind the application and adapt the purchase to that, not the “efficiency” so much. The best tool for the job is really what will determine the answer. You can rest reasonably assured that watt for watt, they all use electricity with virtually the same efficiency.
