The total cost of purchasing and professionally installing an A.O. Smith tankless water heater typically ranges from one thousand five hundred to four thousand five hundred dollars, depending heavily on whether you choose a smaller point-of-use model or a whole-house condensing unit, along with regional plumbing labor rates. The standalone equipment alone generally costs between four hundred and two thousand dollars, while professional labor, gas line adjustments, dedicated exhaust venting, and electrical connections add to the final project total. Whole-house gas tankless systems represent a higher initial investment than standard tanks, but save money through high efficiency.
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