NTI TRX Series II Condensing Boiler – 120,000 BTU – Heat Only – TRX120

NTI TRX Series II TRX120 High-Efficiency Condensing Boiler

The NTI TRX120 Series II Condensing Boiler is a compact, wall-mounted gas boiler designed for residential central heating applications. With a maximum heating input of 120,000 BTU/h, 95% AFUE and modulating operation, the TRX120 delivers efficient hydronic heating in a space-saving design.

The TRX Series II features NTI’s XTRATECH® stainless steel heat exchanger with large-diameter tubing, embedded Wi-Fi connectivity and an integrated ECM pump. Its service-friendly design includes bayonet quick connectors and a swing-down control box for convenient access to internal components.

Key Features

• 120,000 BTU/h maximum input: Modulating central-heating input from 13,200 to 120,000 BTU/h.
• 95% AFUE: High-efficiency condensing performance for residential space heating.
• XTRATECH® stainless steel heat exchanger: Large-diameter stainless steel tubing designed for efficient heat transfer.
• 10:1 modulation: Adjusts boiler output to suit changing heating demand.
• Built-in Wi-Fi connectivity: Embedded connectivity allows the boiler control to communicate with NTI remote connectivity tools.
• Integrated ECM pump: Built-in circulation pump for the heating system.
• Convenient service access: Bayonet quick connectors and a swing-down control box simplify access to internal components.
• Wall-mounted construction: Compact indoor installation format.
• Cascade capability: Compatible TRX Series II boilers can be configured in cascaded systems of up to eight units.

Technical Specifications

• Brand: NTI
• Series: TRX Series II
• Model: TRX120
• Configuration: Heat only
• Minimum space-heating input: 13,200 BTU/h
• Maximum space-heating input: 120,000 BTU/h
• Heating capacity: 111,000 BTU/h
• Net AHRI rating: 97,000 BTU/h
• AFUE: 95%
• Modulation ratio: 10:1
• Heat exchanger: XTRATECH® stainless steel
• Water content: 2 US gallons
• Central heating connection: 1-1/4-inch male NPT
• Gas connection: 3/4-inch male NPT
• Venting: Category IV, sealed combustion, direct vent or power vent
• Approved vent materials: PVC, CPVC and polypropylene, subject to NTI installation instructions
• 2-inch vent length: Exhaust 6–100 ft; intake 0–100 ft
• 3-inch vent length: Exhaust 6–150 ft; intake 0–150 ft
• Electrical supply: 120 V, 60 Hz, single phase, less than 12 A
• Dimensions: 16-3/4 in. W × 45-5/8 in. H × 15-1/8 in. D
• Approximate weight: 88.6 lb
• Manufacturer model code: 3314218
• UPC: 628233739193

Heat-Only Boiler Configuration

The NTI TRX120 is designed for central heating and is not an integrated domestic hot water combi boiler. For a system requiring domestic hot water, a separate indirect water-heating arrangement may be considered where supported by the system design and NTI installation instructions. For integrated domestic hot water production, select a suitable NTI TRX model with a “C” suffix.

Efficient, Connected Residential Heating

Combining a stainless steel heat exchanger, modulating combustion, an integrated ECM pump and built-in Wi-Fi, the NTI TRX120 Series II is designed for efficient hydronic heating with convenient service access. Its compact wall-mounted design makes it a suitable option for compatible residential boiler installations.