Tankless is not always the best and most efficient choice. If you want to be more green, but you also want to save some money, you might look into the newest generation of super-insulated water heaters. They retain 90+% of the heat, and they give tankless water heaters a real run for the money. When you add in the fact that they can be a few thousand dollars cheaper to install, the newst tank water heaters are worth a look.
Making a home greener does not necessarily mean only adding improvements like solar and energy efficient appliances, caulking and sealing. You may want to start by removing toxic items such as paint, insulation, and asbestos. Keep up the good work.... more
Check out this link http://www.clean-energy-ideas.com/articles/pros_and_cons_of_solar_energy.html
For a more specific info, it's good to be in touch with CA Energy Department.
This is what I found on their site re. colar energy:
Hope this helps,
Beachfront Realty, Inc.