ShepherdsDog ShepherdsDog:
we had solar powered water heaters on the roof of our place in Kaohsiung...not so great during typhoons or longer periods of cloud...not a fan of tepid showers
I'm not much of a fan either, but it is better, environmentally at least, than using natural gas to heat your water.
In China, they are on almost every rooftop from Beijing southwards. It sucks if you get the last shower of the day (I speak from experience), but every little bit helps.
Could you imagine if 1.2 billion people used natural gas to heat their water? They already produce too much CO2 as it is.