I have a gas fired boiler (hot water baseboard heat) that I am thinking of replacing. On Takagi's web site they claim that you can get a unit to do double duty. That is, work as your boiler and your tankless water heater.

Has anyone had any experience with this type of setup?

Additional facts:

I live in the mid-atlantic area with a family of five.
I also have a private well.

Has anyone had any experience with a tankless system on a well as opposed to city hookup?

Thanks
Pat