The total cost to purchase and professionally install a Rinnai tankless water heater typically ranges from one thousand eight hundred to four thousand five hundred dollars, depending heavily on regional plumbing labor rates and specific site modifications. The standalone Rinnai unit generally accounts for eight hundred to two thousand dollars of that total, while professional labor, specialized stainless-steel venting, gas line upgrades, and electrical connections comprise the remaining project expenses. Whole-house condensing models trend toward the higher end of this cost spectrum due to their advanced features and complex installation requirements.
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