The average professional labor cost to install a tankless water heater typically ranges from six hundred to one thousand eight hundred fifty dollars, depending on regional labor rates, accessibility, and the complexity of existing plumbing, gas, and venting systems. This labor fee covers removing the old unit, mounting the new tankless system, running dedicated gas lines or intake and exhaust flues, and performing safety inspections. If major electrical service upgrades or plumbing line resizing are required, labor expenses will trend higher.
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