Takagi T‑H3‑OS‑N 199,000 BTU Natural Gas Outdoor Condensing Ultra‑Low NOx Tankless Water Heater

The Takagi T‑H3‑OS‑N is a high‑performance 199,000 BTU outdoor tankless water heater engineered for both residential and light commercial applications. Designed for durability, efficiency, and compliance with Ultra‑Low NOx (<14 ng/J) standards, this model delivers continuous hot water while reducing energy consumption and emissions.

Built with a commercial‑grade copper alloy primary heat exchanger and a 316L stainless steel secondary exchanger, the T‑H3‑OS‑N provides exceptional heat transfer, corrosion resistance, and long‑term reliability — making it ideal for homes, small restaurants, salons, and properties requiring consistent hot water output.

Certified for installation up to 10,100 ft. elevation, this outdoor unit includes a remote control and supports advanced configurations such as recirculation, hydronic heating, radiant floor heating, and storage tank integration.

Key Features & Benefits

• 199,000 BTU high‑capacity output for whole‑home or commercial hot water demand

• ENERGY STAR® qualified for superior efficiency and lower utility costs

• Ultra‑Low NOx compliant (<14 ng/J), meeting strict emission regulations

• Commercial‑grade copper alloy heat exchanger — up to 25× better heat transfer than stainless steel

• 316L stainless steel secondary exchanger for enhanced corrosion resistance

• Outdoor installation eliminates the need for venting through interior walls

• Certified up to 10,100 ft. altitude

• Remote control included for easy temperature and diagnostic access

• NSF certified for commercial use

• Easy‑Link capability for up to 4 units (no controller needed)

• Multi‑Link capability for up to 20 units (with controller)

• Compatible with PVC, CPVC, PP, and Category III stainless venting

• Built‑in freeze protection, overheat protection, surge protection, and diagnostic codes

Ideal Applications

The Takagi T‑H3‑OS‑N is engineered for:

• Whole‑home domestic hot water

• Small commercial spaces (restaurants, salons, offices)

• Hydronic heating systems

• Radiant floor heating

• Recirculation systems

• Storage tank integration

• High‑demand residential properties

Warranty

• Residential: 15‑year heat exchanger / 5‑year parts

• Commercial: 5‑year heat exchanger / 5‑year parts