Solar Water Heaters are state law in Hawaii

Well, it looks like that cozy house that you wanted to buy somewhere on a Hawaiian island (I can hear the laughter) just got a little more expensive. I wonder how long before the California legislature itches to do the same. If you have a couple of days of overcast skies or days of rain, how do you heat up your water for a shower? Answer: most solar water heaters are backed up by electric or gas.