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Description
x 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.
Specifications
x
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)
Documentation and Certifications
xError Codes
xTRX 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.
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.
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.
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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