TK-510C-NI Indoor Tankless Non-Condensing Concentric Vent Water Heater, 199,000 BTU

The Takagi brand has been discontinued by the manufacturer as of December 31, 2025. Suggested replacement units will be available on our website and replacement parts will continue to be available as supplies last. If you'd like any further assistance, please contact our customer service team.

Rebate
Think Green, Save Green. Rebate and incentive programs provide cash-back to consumers for the purchase of appliances that meet certain energy efficiency standards. Most states are offering rebates in the $50 to $250 range. You can search for rebates in your area from here.

The TK-510C-NI is a fully modulating, gas fired, tankless water heater with sealed combustion and power vented flue. Supplies hot water to domestic hot water systems (directly or indirectly) and can be used with water storage tanks, recirculation systems, and/or combined domestic & heating applications.

• This unit is NOT approved for installation in Manufacture Homes and is not suitable for space heating applications only.
• 15-year limited heat exchanger, 5 yrs limited parts Residential use
• Energy Factor of 0.82 for Natural Gas or Liquid Propane
• Convertible from Natural Gas to Liquid Propane
• Complies with Ultra-Low NOx regulations of less than 14 ng/J (<20ppm)
• Maximum flow rate of 10 GPM at 35°F temperature rise
• 15,000 Natural Gas or Liquid Propane BTU Input Minimum
• 199,000 Natural Gas or Liquid Propane BTU Input Maximum
• Commercial Grade Copper Heat Exchanger
• Includes a power cord as standard features
• Concentric Vent design
• Safety features include freeze, overheat, surge protection, and troubleshooting diagnostic codes