Basically, all these sort of heaters just heat up your interior air taken from near the floor inside the room they are nearest to, it gets heated up a lot more outside in the panel, then gets pumped back into the room. So they are really re-heaters. There are any number of different ways to do it, he is just commercializing the idea with a standard good looking unit. You can do it yourself with all sorts of other stuff you can scrounge.
You can do it with water as well, solar heated hot water, using an old junk refrigerator as the insulated box/container/panel, an old junk water heater tank for the collection apparatus, some scrounged safety glass for the front solar part, and some plumbing stuff.
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