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TRX SERIES II GAS-FIRED CONDENSING BOILER: TRX120
120,000 BTU | Wall-Hung | 95% AFUE | ASME “H” Stamped
The TRX120 Series II is a high-efficiency condensing boiler engineered for reliable residential or light commercial heating.
With a modulation ratio up to 10:1 and a 95% AFUE efficiency rating, the TRX120 maximizes comfort while minimizing fuel consumption.
It features a durable 441 stainless steel watertube heat exchanger, ASME “H” stamp certification, and sealed combustion technology
for quiet, safe, and dependable operation. Integrated Wi-Fi smart controls provide easy system monitoring and adjustment.
Energy Efficiency
Designed to deliver maximum energy savings with minimal emissions:
- 95% AFUE rating for significant energy cost reductions.
- 10:1 modulation ratio for optimal load matching.
- Outdoor reset capability with included sensor for responsive heating control.
- Low NOx emissions and eco-friendly operation.
Reliable Function
Built to provide dependable comfort and system safety:
- ASME “H” stamped 441 stainless-steel watertube heat exchanger.
- Integrated ECM boiler circulator for efficiency and durability.
- Sealed cabinet construction for quiet operation.
- Full system protection with automatic diagnostics and error logging.
Convenience & Installation
Simplified design for quick installation and easy service:
- Wall-hung unit with zero clearance to combustibles.
- Setup Wizard for fast commissioning.
- Wi-Fi enabled smart controls for remote monitoring.
- Compact, lightweight design suitable for tight spaces.
Warranty Coverage
NTI backs the TRX Series II with comprehensive warranty protection for the stainless steel heat exchanger and other key
components, ensuring years of reliable service and peace of mind.
| Item | Parameter |
|---|---|
| Product | TRX120 Series II |
| Input Rating (CH) | 13.2 – 120 MBH |
| Heating Capacity | 111 MBH |
| Net AHRI Rating | 97 MBH |
| AFUE | 95% |
| Modulation Ratio | 10:1 |
| Boiler Setpoint | 68–179°F (20–82°C) |
| Ambient Operating Range | 33–104°F (0.6–40°C) |
| Max Water Pressure (CH) | 50 psi |
| Relief Valve | 30 psi |
| Gas Supply Pressure (NG) | 3.5 – 10.5 in. W.C. |
| Gas Supply Pressure (LP) | 8 – 13 in. W.C. |
| Heat Exchanger | 441 Stainless Steel, Watertube |
| Dimensions & Weight | |
| Height | 35.4 in. (900 mm) |
| Width | 17.3 in. (440 mm) |
| Depth | 15.6 in. (395 mm) |
| Weight | 115 lb (52 kg) |
NTI-TRX-Series-II-Brochure-Comp
NTI-TRX-Series-II-Brochure-Comp-FR
TRX Series II Installation and Operation Manual TRX085:110C:120:150C
TRX Series II Installation and Operation Manual TRX085:110C:120:150C-FR
TRX Series II Installation and Operation Manual TRX150:199:199C
TRX Series II Installation and Operation Manual TRX150:199:199C-FR.pdf
TRX Series II Error Codes
-
Blocking Errors – Temporary interruptions that auto-clear when the fault condition is removed.
Examples: 110 – Supply Sensor Fault, 132 – Return Sensor Fault, 133 – DHW Sensor Fault, 108 – Pump Antifreeze Run. -
Lockout Errors – Critical issues that require manual reset via the Reset button.
Examples: 501 – Ignition Failed, 502 – Flame Lost, 103 – Overheating (>210°F), 104 – Low Water Pressure. -
Malfunction Warnings – Non-critical alerts indicating maintenance/service is required.
Examples: 201 – Flue Sensor Fault, 202 – Air Pressure Switch Error, 203 – Fan Speed Error, 204 – Gas Valve Error.
⚠️ If lockout errors occur frequently, contact a qualified service technician. For safety, the boiler allows only 5 resets within 15 minutes; a 6th attempt locks the unit until power is cycled.
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