"Morris Dovey" wrote in message
...
dennis@home wrote:
| "Mary Fisher" wrote in message
| t...
|
||
|| In January 1993 we paid something over £300 for cavity wall
|| insulation, accompanied by the mocking of neighbours (just as they
|| did in January 2005 when installed solar water heating). They said
|| it wouldn't make any difference to anyone except the company which
|| did it.
|
| Was it a new house then?
| I had cavity wall insulation in 1980.
| Being a physicist I was able to work out how much it would save me
| in gas whatever the neighbors said.
| I do not have solar heating, nor will I unless I DIY it as it
| doesn't make economic sense and it won't help global warming either.

Hmm. A physicist in Germany who might have the skills to DIY...

UK actually, you can't trust usenet servers to give an indication of the
country of origin.
I could have used my US account and then you would think I was an American.
..
And no if you have to buy the stuff it at current prices it doesn't make
sense.
Just look at the $3000 a large DIY chain is asking for a crude solar panel.


It might make economic sense if you took it as a challenge to your
abilities as a physicist - Think of it as a challenge to design a
one-way black/gray body aperture. I think you have everything you need
to /make/ it have economic sense, even in your climate (BICBW).

It _is_ a physics problem, you know. :-D

No its economics.
You either save cash or you believe in global warming and save energy.
Neither of those is clear cut in the case of solar heating in the UK.