I don't think there is much room for assumptions about the intended meaning of several claims. This one in particular is pretty unambiguous (except for maybe the words "up to"?):
"Property valuers have estimated that the Thermogen system will add up to $180,000 to the value of a home and the extra income from power generated will supply a revenue stream of up to $20,000 per annum at current rates which will pay the mortgage on most homes in Australia."
I am not talking about small errors of assumption. I am talking about huge errors of concept. In every calculation I've applied the benefit of the doubt thickly with a trowel and even then I think the claimed performance is still an order of magnitude away from reality. It is simply not fair to lure the Australian public with $x0000s and $x00000s like this.
You are right, though - much better to approach the manufacturers than continue this discussion here. I shall continue to conduct my own research and investigations to help satisfy my own judgement elsewhere.
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