Reznor UDXC 120,000 BTU Natural Gas Unit Heater, Propeller Fan, Separated Combustion Convertible - Replaces UDX-125 / UDZ-125

Q: What is the max length for B-vent to exhaust through the roof?

Please refer to pages 34-35 of the installation manual for vertical venting size constraints.

Reznor UDXC 120,000 BTU Natural Gas Unit Heater, Propeller Fan, Separated Combustion Convertible - Replaces UDX-125 / UDZ-125

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Model

UDXC-125

108489

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Product Features

120,000 BTU heating capacity with TCORE2 titanium stabilized aluminized steel heat exchanger
Vibration isolated propeller fan designed for low noise operation
Standard power vent setup can be converted to separated combustion all in one unit
Certified for Residential Garages & Workshops, Commercial, and Industrial applications

Thermostats

Choose Venting Method

Air Deflector Options

Mounting Brackets

Vent Kits (Power Vented)

Vent Kits (Separated Combustion)

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Description

Introducing the new Reznor UDXC Universal, Gas-Fired Unit Heater. The Reznor model UDXC gas-fired unit heater is designed to provide safety, comfort, and efficiency to industrial, commercial, and residential buildings. The Reznor UDXC boasts a TCORE2 heat exchanger, featuring titanium-stabilized aluminized steel for long-lasting performance and efficient heating.

Included

Reznor UDXC 120,000 BTU Low Static Axial Fan Convertible Gas-Fired Unit Heater; Model UDXC-125

Included

Reznor UDXC 125,000 BTU Low Static Axial Fan Convertible Gas-Fired Unit Heater; Model UDXC-125

Built to last and look great. The UDXC also features a durable, two-tone, scratch-resistant paint finish. Clean rounded corners and edges and hidden fasteners enhance its modern design, making it ideal for industrial or residential use.

Standard Features

120,000 BTU
Uses Axial Propeller Fan
82 - 83% AFUE Efficiency
Field convertible to separated combustion
Sealed control compartment houses all electrical components
TCORE2 titanium stabilized aluminized steel heat exchanger
Vibration/noise isolated fan and venter motors
Certified for commercial/industrial heating applications
Approved use in residential garages and workshops

Product Note

Replaces UDX-125 / UDZ-125 / UDAP-125 / UDAS-125

Product Specifications

More Information
Reznor UDXC 120,000 BTU Natural Gas Unit Heater, Propeller Fan, Separated Combustion Convertible - Replaces UDX-125 / UDZ-125
Feature	Spec
SKU	UDXC-125
Weight (in lbs)	125.000000
Brand/Manufacturer	Reznor
Replaces	UDX-125
Furnace Efficiency / AFUE	80-85%
Heating BTU	120,000 BTU
Maximum CFM	1537
Decibel Level (dBA)	55dB at 15ft
Flue Outlet	4"
Watt	354
Efficiency	83%
Electrical	115 Volt 1 Phase 60 Hertz
Phase	Single Phase
Amperage Requirement	5.6
Operating Mode	Heating
Connection	1/2" NG/LP Connection to Gas Valve
Fuel Type	Natural Gas
Height	24.75"
Width	27"
Depth	34 9/32"
Warranty	9 Year Heat Exchanger, Burner, and Flue Collection Box Assembly; 4 Year All Electrical and Mechanical Components
Resources	Reznor UDXC Gas-Fired Catalog Reznor UDXC Brochure Reznor UDXC Technical Specifications Reznor UDXC Installation and Maintenance Manual Reznor UDXC Replacement Parts Reznor UDXC Warranty You will need Adobe Acrobat Reader to view PDF documents.
Safety Information	PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.

Reviews 55

Questions and Answers

Customer Questions

Can this heater be used to heat a home?

These heaters can be used in a garage, but they are not approved for use in indoor living spaces. If you have any further questions, please feel free to give us a call! Thanks.

If the green light is green flashing, what does that mean?

There are a variety of things that this could indicate. Refer to Table 26 on page 59 of the Reznor UDXC Installation and Maintenance Manual. If you have any further questions, please feel free to give us a call! Thanks.

What type of venting do these unit heaters require? B-vent or PVC?

These units require Category I (B-vent) for vertical venting through the roof, or Category III for venting horizontally through side walls. The exhaust on these units exceeds a temperature that would allow for PVC Venting. If you have any further questions, please feel free to give us a call. Thanks!

Can I use PVC pipe for the combustion air intake?

Reznor does not approve the use of PVC pipe for combustion air intake. Reznor only approves the use of the concentric venting, which is not compatible with PVC. Attempting to vent non-concentric can lead to pressure imbalances which would cause the pressure switch to intermittently turn the unit off. If you have any further questions, please feel free to give us a call. Thanks!

What is the max length for B-vent to exhaust through the roof?

Please refer to pages 34-35 of the href="https://hvacdirect.com/media/pdf/Reznor%20UDXC%20Installation%20and%20Maintenance%20Manual.pdf" target="rltdDoc">installation manual for vertical venting size constraints. If you have any further questions, please feel free to give us a call. Thanks!

Why Choose Reznor Unit Heaters?

Reznor unit heaters are engineered for powerful, energy-efficient heating in commercial, industrial, and residential spaces. With durable construction and advanced technology, these heaters deliver reliable warmth, even heat distribution, and flexible installation options—making them ideal for warehouses, garages, workshops, and more.