How much it costs to replace a Navien tankless water heater depends on unit, installation, and whether converting from tank, but typically costs $2500 to $5000 total installed for residential. Navien was founded in 1978 in South Korea, headquartered in Seoul, South Korea, makes Navien tankless water heaters including NPE and NPE-2 series, costing $1000 to $2500 for unit alone, depending on size like 199,000 BTU and features like built-in recirculation and condensing high efficiency 0.95 to 0.98 UEF. For direct replacement where you already have tankless with existing 3/4 inch gas line and proper venting, replacement costs $2500 to $3500 including unit $1000 to $2500 plus labor $500 to $1500 for removal of old unit and installation of new, plus permit $100 to $200. If converting from tank water heater to Navien tankless, costs $3500 to $5000 because you need gas line upgrade from 1/2 inch to 3/4 inch, new venting with concentric PVC or stainless steel, condensate drain, and possible electrical outlet. Costs include removal of old tank $100 to $300, new isolation valves $100, and professional installation. Compared to replacing tank water heater which costs $1000 to $2000 installed, Navien tankless costs more upfront but saves 30 to 40 percent on gas bills and lasts 20 plus years versus 10 to 15 for tank. So replacement costs $2500 to $5000 total.
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