Takagi Natural Gas Outdoor Condensing Tankless Water Heater

Get endless hot water with this highly efficient gas tankless residential water heater by Takagi. Also, great for use with radiant floor heating systems!


SKU: T-H3J-OS-N Categories: ,


This Natural Gas Outdoor Condensing Tankless Water Heater by Takagi (T-H3J-OS-N) is a highly efficient, condensing tankless water heater for residential applications. The T-H3J-OS-N can produce enough hot water for two bathrooms in warmer climates or 1.5 baths in colder climates with gas inputs of 160,000 BTU. This tankless water heater can also be used with storage tanks, recirculation systems, radiant floor heating, and hydronic heating.


  • 15 Year Limited Warranty – Heat Exchanger
  • 5 Year Limited Warranty – Parts
  • Copper heat exchanger (25X better heat transfer than stainless steel)
  • NSF Certified for Commercial Use
  • Complies with Ultra-Low NOx regulations of less than 14 ng/J (<20ppm)
  • Energy Star Rated
  • Safety Feature Diagnostic Codes
    • Freeze
    • Overheat
    • Surge Protection

Additional information

Weight 58 lbs
Dimensions 11.25 × 17.75 × 24.88 in



Installation Guide
Spec Sheet