Takagi T-T1-OS-NG Outdoor Commercial Tankless Water Heater
Model T-T1-OS-NG
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Btu
199000
Venting
Outdoor — no venting
Fuel Type
Natural Gas
Tank Type
Tankless
Capacity Gpm
10
Energy Factor
0.94
Takagi T-T1-OS-NG Outdoor Commercial Tankless Water Heater Review
The Takagi T-T1-OS-NG is an outdoor commercial tankless water heater. "T-T1" identifies the smaller commercial platform; "OS-NG" means outdoor sealed natural gas.
Specs: 199,000 BTU natural gas input, UEF 0.95 condensing, 11.0 GPM at a 35°F rise, dual stainless heat exchanger. Sealed direct-vent exterior mounting. 12-year warranty on heat exchanger.
The outdoor commercial configuration serves light commercial applications in warm-climate markets. Eliminates indoor venting cost for commercial installs that can use exterior wall mounting.
About $2,900 unit, $4,400 installed. Right buyer: light commercial application in warm-climate region with exterior wall mount location.
Pros
- Outdoor mounting — eliminates indoor venting cost ($500–1,500 savings) and frees mechanical room space
- Strong UEF 0.94 efficiency — approximately 20% lower annual operating cost vs 0.62 standard
- 10-year warranty — solid above-average coverage for this class
- High 10 GPM output — serves 3+ simultaneous hot-water fixtures in most US climates
Cons
- Requires dedicated 199K BTU gas supply line — undersized gas piping is the leading cause of flow-rate shortfalls
Full Specifications
Brand
Takagi
Model Number
T-T1-OS-NG
Btu
199000
Venting
Outdoor — no venting
Fuel Type
Natural Gas
Tank Type
Tankless
Capacity Gpm
10
Energy Factor
0.94
Warranty Years
10
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