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TRX SERIES II GAS-FIRED CONDENSING BOILER: TRX150
150,000 BTU | Wall-Hung | 95% AFUE | ASME “H” Stamped
The TRX150 Series II is a high-efficiency wall-hung condensing boiler designed for larger homes and light commercial applications.
With a powerful 150,000 BTU input and a 95% AFUE efficiency rating, it provides reliable heating performance while minimizing energy costs.
Built with a 441 stainless steel watertube heat exchanger and ASME “H” stamp certification, the TRX150 ensures durability, safety, and long-term comfort.
Integrated Wi-Fi smart controls make monitoring and adjustments convenient from anywhere.
Energy Efficiency
The TRX150 delivers superior performance while reducing emissions:
- 95% AFUE rating for high seasonal efficiency.
- 8:1 modulation ratio for precise output control.
- Outdoor reset with included sensor for responsive heating.
- Eco-friendly low NOx emissions.
Reliable Function
Engineered for durability and safe operation:
- ASME “H” stamped 441 stainless-steel watertube heat exchanger.
- Integrated ECM circulator pump and condensate trap.
- Automatic fault detection with lockout/error history.
- Sealed cabinet for quiet, efficient operation.
Convenience & Installation
Designed for fast installation and easy service:
- Wall-hung with zero clearance to combustibles.
- Quick setup with built-in Setup Wizard.
- Wi-Fi enabled for remote monitoring and adjustments.
- Compact footprint with lightweight design for tight spaces.
Warranty Coverage
NTI protects your investment with industry-leading warranties, covering the stainless steel heat exchanger and other key components for years of dependable service.
| Item | Parameter |
|---|---|
| Product | TRX150 Series II |
| Input Rating (CH) | 15 – 150 MBH |
| Heating Capacity | 139 MBH |
| Net AHRI Rating | 121 MBH |
| AFUE | 95% |
| Modulation Ratio | 8:1 |
| 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 | 128 lb (58 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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