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[QUOTE="Minicoop69, post: 3976379, member: 4323"]
Natural gas will have to be 3/4" coming to the heater.  The old tanked models only used 1/2", so that will cost for that.  Some of the newer Tankless models can use 1/2" gas lines, but only for the smaller sizes.  I would recommend going with the next model up than you are calculating to future proof it.

There is a lot of thought on if Tankless heaters really save money or not.  The thought is that if you know that you can run a shower for days without losing hot water then you will not be saving any money at all.  If you are going to be using it for the same time as a tanked model then yes you will save money.

Check into Recirculating pumps also.  Some tankless models they come with it.  They will raise your electric bill because they are running almost all the time, but you will never be without hot water at any faucet for more than a couple of seconds.  The Con is that your cold water will run hot for a little while getting the hot water out of the line.
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