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TRX SERIES II GAS-FIRED CONDENSING BOILER: TRX199
199,000 BTU | Wall-Hung | 95% AFUE | ASME “H” Stamped
The TRX199 Series II is the largest capacity model in the TRX Series, designed for demanding residential and light commercial heating applications.
Delivering up to 199,000 BTU with 95% AFUE efficiency, the TRX199 ensures powerful heating while keeping energy consumption low.
Built with a durable 441 stainless steel watertube heat exchanger and ASME “H” stamp certification, the TRX199 offers robust performance, safety,
and long-term reliability. Integrated Wi-Fi controls allow convenient system monitoring and adjustments from anywhere.
Energy Efficiency
The TRX199 combines power and efficiency for maximum performance:
- 95% AFUE seasonal efficiency.
- 10:1 modulation ratio for precise load matching.
- Outdoor reset included for weather-responsive operation.
- Eco-friendly, low NOx emissions.
Reliable Function
The TRX199 is engineered with premium-grade components for dependable operation:
- ASME “H” stamped 441 stainless-steel watertube heat exchanger.
- Integrated ECM circulator pump and condensate trap.
- Automatic system protection and diagnostic history.
- Quiet operation with sealed cabinet construction.
Convenience & Installation
Designed for professional installation and ease of service:
- Wall-hung design with zero clearance to combustibles.
- Setup Wizard for simplified commissioning.
- Wi-Fi enabled controls for remote system monitoring.
- Compact footprint for space-saving installation.
Warranty Coverage
NTI backs the TRX Series II with industry-leading warranty coverage, including long-term protection for the stainless steel heat exchanger
and critical components to ensure lasting performance and peace of mind.
| Item | Parameter |
|---|---|
| Product | TRX199 Series II |
| Input Rating (CH) | 19.7 – 197 MBH |
| Heating Capacity | 184 MBH |
| Net AHRI Rating | 160 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 | 135 lb (61 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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