posted 11 years ago
Over unity is only possible when the energy comes from somewhere else. Most heat pump systems could be described as being "over unity" - they move heat from outside the house to inside. The devices described on that website don't look like they would be over unity, although they might perhaps be more efficient than a standard heater element.
Also, I'm sceptical about the claim that a heating device was taken off the market "because it competed with gas". The market is pretty good at picking up innovations that improve on old technology, devices that don't tend to become popular often don't live up to their hype.
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