We have a tankless system off the furnace and heat with #2 heating oil. It was more economical a couple of years ago but since the price of heating oil is starting to come down, we can't justify the replacement of the furnace yet with a propane furnace.
Last winter we purchased less than 500 gal. of heating oil to heat 2,200 sq. ft and the hot water. I've got about an eighth of a tank now and unless we have to run the furnace, this will last us until October when we'll get our first fill up of the season.
By the way, we're a family of four with several pets and never run out of hot water. Even with clothes washing, dishwashing, showers, baths, etc. - never out even when we've had a bunch of guests staying with us!
One more thing - we have an "insta-hot" facuet off the kitchen sink for immediate hot water - like making tea on tap or getting water to boil. It's very handy and less wasteful! I love that feature of our kitchen!
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