The average total cost to purchase and professionally install a whole-house gas tankless water heater typically ranges from two thousand five hundred to five thousand dollars, depending heavily on regional plumbing labor rates and necessary modifications. The standalone unit generally costs between eight hundred and two thousand five hundred dollars, while professional labor, gas line upgrades, dedicated stainless-steel venting, and electrical connections account for the rest of the project total. While the initial investment is significantly higher than a traditional storage tank, the long-term energy savings and twenty-year lifespan offset the upfront expense.
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