Seems like a rehash of an old idea,nichrome resistance wire sanwiched between 2 panels,but with obviously thinner wire,hence the low wattage needed.

The best electric heat I ever saw was installed in a local estate in the '50's I think.

These were wallmounted units,very flat with opaque glass panels that had resistance wire inside and a reflective mirror coating on the rear,I think they were called Glassfire or something,thermostat regulated.

__________________