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TRX SERIES II GAS-FIRED CONDENSING COMBI BOILER: TRX110C
110,000 BTU | Wall-Hung | 95% AFUE | Combi with DHW | ASME “H” Stamped
The TRX110C Series II Combi Boiler combines high-efficiency space heating with on-demand domestic hot water in a compact wall-hung unit.
Built with a 441 stainless steel watertube heat exchanger, the TRX110C is ASME “H” stamped and certified to ANSI Z21.13 / CSA 4.9 standards.
It delivers reliable heating comfort and endless hot water while saving energy with a 95% AFUE efficiency rating.
The boiler features sealed combustion, quiet operation, and integrated Wi-Fi smart controls for remote monitoring and adjustment.
Energy Efficiency
The TRX110C maximizes efficiency and minimizes fuel costs with advanced combustion technology:
- 95% AFUE seasonal efficiency.
- 10:1 modulation ratio for precision load matching.
- Outdoor reset with included sensor for weather-responsive heating.
- Low NOx emissions and eco-friendly design.
Reliable Function
Built for dependable performance, the TRX110C includes:
- ASME “H” stamped stainless-steel heat exchanger.
- Integrated ECM boiler circulator and 3-way diverter valve.
- Automatic system protection and diagnostic fault codes.
- Sealed cabinet for quiet operation and long service life.
Convenience & Installation
Designed for flexibility and quick setup:
- Wall-hung, zero clearance to combustibles.
- Built-in Setup Wizard for fast commissioning.
- Integrated domestic hot water plate heat exchanger with flow sensor.
- Wi-Fi enabled controls with remote access capability.
Warranty Coverage
NTI provides industry-leading warranty protection with long-term coverage for the stainless steel heat exchanger and other major components, ensuring years of reliable operation.
| Item | Parameter |
|---|---|
| Product | TRX110C Series II (Combi) |
| Input Rating (CH) | 11.2 – 106 MBH |
| Input Rating (DHW) | 11.2 – 114 MBH |
| Heating Capacity | 98 MBH |
| Net AHRI Rating | 85 MBH |
| AFUE | 95% |
| Modulation Ratio | 10:1 |
| Boiler Setpoint | 68–179°F (20–82°C) |
| DHW Temperature Range | 97–140°F (36–60°C) |
| Max Water Pressure (CH) | 50 psi |
| Max Water Pressure (DHW) | 125 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 |
| DHW Flow (35°F Rise) | 5.9 GPM |
| DHW Flow (45°F Rise) | 4.6 GPM |
| Dimensions & Weight | |
| Height | 35.4 in. (900 mm) |
| Width | 17.3 in. (440 mm) |
| Depth | 15.6 in. (395 mm) |
| Weight | 120 lb (54 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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