Nice job, Hawaii! Solar water heating is cheap to implement and hugely economical in a warm climate such as Hawaii. All states with a decent climate should follow suit here, as it's a travesty to allow all that sunlight hitting your roof, and all that electricity and gas used by water heaters to go to waste when there's such an affordable common-sense solution available to this problem. As more states move forward with this type of requirement, look for standard building material suppliers to start incorporating the technology at lower and lower costs, benefiting us all. Still, 2010 is a pretty ambitious deadline, and I wouldn't be surprised to see supply issues, lack of expertise on the part of contractors, and bureaucratic red tape holding up housebuilding in the state.
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