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When I lived in CT I had what they called domestic hot water. The oil burner had a heater section that essentially heated the water for free in the winter when the heat was already running so the boiler was hot. In the summer though it would have to heat the whole boiler to get some hot water. The bill was like $30 a month in the summer just for hot water. I bought an electric hot water heater at Sears and installed it inline with the domestic hot water from the boiler. In the winter I still got the free hot water but in the summer i switch the boiler off so it would not come on just for hot water, In the summer the hot water heater from sears did the job. Payback on that was less than 2 years. Anybody could do the same if they have an old boiler with domestic hot water.
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