A: The answer will depend on if you have a gas, electric, or oil heated hot water system. A thermal system will decrease the amount of electricity, gas, or oil that you are spending on a monthly basis for heating the water. It will not depend on the size of your home. You would need to meet with a solar hot water installer to find the exact figures on how much it would save you on a monthly basis. It is a great place to start to convert your house to “green” due to the relatively lower cost than a PV electrical system.
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Good stuff. Agree completely that solar thermal can be a great way to venture into renewables (after energy-efficiency).
Thanks,
Mike