Series 200 Ultra Low-NOx Non-Condensing Outdoor Tankless Water Heater (10 GPM, NG/LP)

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.

Please note: This unit comes Natural Gas as standard, but can be easily converted to Propane with the supplied gas conversion kit. 

Please note: TK-510U CAN BE USED IN BOTH RESIDENTIAL AND COMMERCIAL APPLICATIONS

Fully modulating, gas fired, tankless water heater with sealed combustion and power vented flue. Indoor and outdoor models available for residential and commercial applications. Supplies hot water to domestic hot water systems and can be used with water storage tanks, recirculation systems, and/or combined domestic & heating applications.

Series 200 incorporates several new features including a combustion system that can easily be field converted from natural gas to propane with components supplied in the box. The maximum vent length has increased to 60'. The indoor models will have an integrated temperature controller and factory installed power cord. The outdoor models will include a remote control as a standard feature.

Features:

• This unit is NOT approved for installation in Manufacture Homes and is not suitable for space heating applications only.
• Capacity: 2 to 4 Showers
• Field Convertible from Natural Gas to Propane
• Complies with SCAQMD rule 1146.2 and other air quality management districts with similar NOx emission requirements of 14 ng/J or 20 PPM.
• Maximum flow rate of 10 GPM at 35°F temperature rise (4.7 GPM at 70°F rise)
• Copper HEAT EXCHANGER: 25x better heat transfer than stainless steel thus stabilizing outgoing water temperature quicker and reducing pressure drop across the heat exchanger
• Outdoor models include remote control
• 15-year limited warranty on heat exchanger in residential applications, 10-year limited warranty on heat exchanger in commercial applications, 5-year limited warranty on all parts
• Complies with Lead Free standards
• Easy-Link up to 4 units (no additional parts or accessories needed)
• Multi-link up to 20 units