This is true, I have read accounts of it elsewhere. People who experienced it described it as a very odd sensation, because no matter how cold the air around you was, you simply didn’t get cold, even with no clothes on. If you went into a cold room and turned the microwave emitter on, within just a few seconds you were perfectly warm. If you turned it up or down, within just a few seconds you could feel the change in the temperature setting.
…I don’t know that it was used long-term enough for the health effects to become apparent.
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So unshielded microwave emissions, no matter how low-intensity, would increase your risk of cancer in proportion to the emissions, right? I’m asking, I don’t know.
As far as I know, there’s no established scientific link between microwaves and cancer. However, there is an established scientific link between thermal damage(burns) and cancer. With microwaves you would be increasing the number of denatured proteins and killed cells in your body that can turn other things around cancerous, I suppose.
Which health effects would those be? As far as I know, unless you heat up your tissue to over 200 degrees F and therefore change the chemical structure of proteins, microwave radiation would not otherwise damage you.
It would cause hell for my 802.11b WLAN and 2.4 GHz cordless phone, however.
Just a note: the accounts I have read were of radio/electronics enthusiasts having built their own setups for doing this. I never heard of any commercially-produced or commercially-sold microwave room heater.
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here is kind of an ‘anti-cite’: http://www.snopes.com/horrors/techno/cooked.htm
That is the story I first thought of when reading the OP, didn’t know it was an urban legend until I looked it up though.
This sounds a bit unlikely, weren’t microwaves first proposed for cooking after lots of birds were found dead (and thoroughly cooked) after sitting on a radar installation?