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Message: [QUOTE="EdSaid, post: 4390331, member: 10651"] I have natural gas and I replaced both my hot water and my boiler for forced hot water heat with a Navian tankless about 1 1/2 years ago. My brother is a plumber and he swears by them. He told me in the future it would be inexpensive and easy to replace the heating unit (if and when it goes bad) once everything else is installed around it. The Navian unit is under $3,000, but there is a lot do it. The whole thing cost around 12. I think they key to saving money is using the programmable thermostats. I have five zones and they are tricky to program. I head south for the winter so I can't tell you how much it saves on heat, but I know it saves on hot water in the warmer months. I'm in Massachusetts and the state runs a program (with extra benefits for seniors). I got 7 years 0% financing and attic insulation for 80% off. I'm very handy, and the thing really looks complicated. It takes up a good amount of wall space, but it frees up a lot of floor space. It does make some weird noises, so keep it away from bedrooms if possible. I got a quote from a plumber and it was 14, so I think I got a good deal. With the old school hot water tank you have hot water during a power outage, with the tankless you do not. I put in a whole house generator a few years early. [/QUOTE]