Replacing an existing Rinnai tankless water heater with a new unit typically costs between two thousand and four thousand five hundred dollars for a complete turnkey project, which includes removing the old equipment, purchasing the new unit, and paying for professional plumbing labor. If the replacement utilizes the existing gas lines and stainless-steel venting system without requiring major modifications, costs stay toward the lower end. However, switching models or upgrading venting to meet modern code requirements will increase total project expenses.
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