The largest domestic shower I've seen here is rated 9.6kW (40A). These have become much more common in the last few years. I have one of the older 1970s units (a Heatrae Carousel) on my shower which is rated only 6kW.

Quadruple glazing -- Wow, I'm impressed! [Linked Image] I knew that triple glazing was being used in America and Continental Europe now, but it's still not really caught on in a big way here. As I've said before, Britain really is slow in getting away from cold, drafty old houses.

Re the underground heat distribution in Stockholm, do the pipes carry hot water or steam?

I know that many years ago Con-Edison distributed steam along a network of pipes under New York City to provide heating. (It's the steam you sometimes see escaping through grids in the street in old movies.) It always seemed logical to me to use the steam from their generating plants in this way rather than just waste all the heat.

I don't whether ConEd still uses this system. I'm sure one of our New Yorkers will provide the answer. [Linked Image]