Sorry buddy. This is simply not true. You cannot change the laws of physics. Electric heat is simple --- so many watts in means so many watts out, and this applies to ALL electric heaters
If it's "cheaper to operate" it's because you are now heating a smaller space, or you have suddenly fallen below your local utilities "peak demand." Neither of these conditions has anything to do with what you paid for the heater, or the label on the side.
Any 10 dollar thrift store, or 40 dollar hardware store heater will do the same job as whatever the fancy boxed up you name it five easy payments to the whatever group of "we dress in black" of your choice.