To put this in perspective, you'd be running 15 - 20 conventional table fans. Terrific circulation, but anchor your paperwork.
There's a bit more to engineering an excellent space heater than simply getting 1500 watts into it. How efficiently that 1500 watts is used, and in what manner it's used, makes a huge difference in the device's usefulness as a space heater.
You have basically three choices:
- forced air
The Vornado is a forced air type, as is the ceramic Holmes under my desk. The Vornado apparently excels at air circulation, making it a better option for heating a room. My Holmes has a much weaker fan, but that works to its advantage in terms of heating just my corner of my office. A convection heater (such as an oil filled type) would probably serve me better - as I want minimal circulation - but I'm not willing to give up the space.
Since I want to concentrate the heat, I don't think I'd be happy with the Vornado.
We all already know that the energy is not destroyed - it's just transferred and transformed - however, the bottom line is how efficient is any given space heater in heating the intended space. As far as space heaters go, speaking from experience I will say that this Vornado strikes a pretty solid balance in terms of how it uses the 1500w of energy.
How the heat is circulated is what is important, not how 'efficiently' it uses the 1500 watts. Each of the heaters operates at 100% efficiency.
My basic point is that no matter how much you spend, you will still get exactly the same net amount of heat. Choose your fan based on your heat circulation needs, and then consider appearance, warranties, etc. But don't believe that brand X will heat more for fewer bucks.