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Description
x TRX SERIES II GAS-FIRED CONDENSING COMBI BOILER: TRX199C
199,000 BTU | Wall-Hung | 95% AFUE | Combi with DHW | ASME “H” Stamped
The TRX199C Series II is the largest combi boiler in the TRX lineup, delivering powerful central heating up to 199,000 BTU
and continuous domestic hot water. With 95% AFUE efficiency, the TRX199C combines maximum performance with energy savings.
Featuring a 441 stainless steel watertube heat exchanger and ASME “H” stamp certification, this combi boiler is designed for durability,
safety, and reliable operation in high-demand applications. Integrated Wi-Fi smart controls provide convenient system monitoring
and adjustments at your fingertips.
Energy Efficiency
The TRX199C delivers exceptional output with high energy savings:
- 95% AFUE seasonal efficiency.
- 10:1 modulation ratio for precise output control.
- Outdoor reset with included sensor for adaptive heating performance.
- Low NOx emissions for eco-friendly operation.
Reliable Function
Engineered for long-term durability and dependable performance:
- ASME “H” stamped 441 stainless-steel watertube heat exchanger.
- Integrated ECM circulator and 3-way diverter valve for seamless CH/DHW switching.
- Automatic fault detection, lockout, and diagnostic history.
- Quiet operation with sealed combustion cabinet.
Convenience & Installation
Designed for professional installation and easy service:
- Wall-mounted design with zero clearance to combustibles.
- Setup Wizard simplifies commissioning process.
- Wi-Fi enabled for remote monitoring and adjustment.
- High DHW output with integrated plate heat exchanger and flow sensor.
Warranty Coverage
NTI provides industry-leading warranty coverage, protecting the stainless steel heat exchanger and other vital components
for years of dependable service and peace of mind.
Specifications
x
Item
Parameter
Product
TRX199C Series II (Combi)
Input Rating (CH)
19.7 – 197 MBH
Input Rating (DHW)
19.7 – 199 MBH
Heating Capacity
184 MBH
Net AHRI Rating
160 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)
150 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)
9.2 GPM
DHW Flow (45°F Rise)
7.2 GPM
Dimensions & Weight
Height
35.4 in. (900 mm)
Width
17.3 in. (440 mm)
Depth
15.6 in. (395 mm)
Weight
137 lb (62 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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