Thank you for your reply.

2007, solar thermal systems installed total  in Japan
residential use was 1%, simple batch heaters less than 7%
and rapidly *de*creasing.
source: http://www.ssda.or.jp/profile/databook.pdf p27

In Tokyo, the  *first* condo with solar thermal was
just put on the market a week ago,
http://www3.daiwahouse.co.jp/mansion/kanto/29000/setagaya282/
pointing the way but also illustrating how far Japan is lagging behind
and how huge the remaining solar thermal market in Japan is.

Kind regards
Oskar Bartenstein http://www.ecolifelab.com

On 9/14/2010, "Keith Addison" wrote:

>One thing to add, I think most domestic hot water in Japan is
>currently heated by passive solar systems.




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