Q. We have the original oil-burning furnace in our 29-year-old home. It’s attached to a tankless hot water heater and supplies all of the hot water for the house, including domestic hot water and our ...

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No hot water heat system on earth uses fresh water. I used to live in a place with steam heat, and we'd have to add water once in a while to replace what had hissed out of the overpressure valves, but ...