Just to address the won't pay for itself crowd, mine paid for itself in 3 months, I've yet to have a customer take more than 3 yrs to recoup the install cost. Most customers save enough to pay for the job, including gas line, in about a year not counting the tax credits. With a gas tank water heater it will take a bit longer but not by much, and the lack of maintenance and the convenience of endless hot water/worry free operation easily offset the cost of going tankless.
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