Reznor UDX 100,000 BTU Natural Gas Unit Heater - NUDX100
Reznor model UDX gas-fired unit heaters are great for space heating applications. These units are power vented to eliminate heat losses up the flue pipe. Each heater features a two-tone black and white powder coated, scratch-resistant paint scheme and has clean rounded corners and edges with no visible screws or fasteners. For air circulation, the UDX series utilize an axial propellor fan.
Features
- 83% AFUE Efficiency
- TCORE2 titanium stabilized aluminized steel heat exchanger
- Multi-try, direct spark ignition with time lockout
- Vibration/noise isolated fan and venter motors designed for low noise operation
- External status indicating LED that blinks if there is a problem that needs service
- 7-segment display board that shows fault code for quick and easy troubleshooting
- Optional integrated downturn nozzle and integrated vertical louvers
What our Experts Think
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Versatile heating for mid-to-large spaces
With 100,000 BTU output, this unit is ideal for larger garages, workshops, and light commercial buildings, offering strong, consistent heat without stepping into oversized industrial capacity.
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Efficient performance for daily use
Rated at ~82–83% thermal efficiency, it strikes a practical balance between fuel savings and heating power, making it cost-effective for regular operation.
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Built for durability in demanding environments
The TCORE2 titanium-stabilized aluminized steel heat exchanger ensures long-term resistance to corrosion and wear—key for workshops or industrial settings.
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Strong airflow & heat distribution
Equipped with an axial propeller fan (~1300+ CFM), it delivers wide air coverage and helps maintain even temperatures across larger areas.
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Quiet, low-vibration operation
Designed with vibration-isolated motors and fans, it keeps noise levels relatively low (~54 dB), suitable for active workspaces.
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Installer-friendly & service-ready design
Features like LED diagnostics, fault-code display, and external wiring access simplify installation and maintenance—reducing downtime and service costs.
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Flexible installation options
Supports power venting and optional separated combustion, making it adaptable for dusty, tight, or complex installations.
Q&A
Q: What is the heating capacity of the Reznor UDX100?
A: It delivers 100,000–105,000 BTU input (~87,000 BTU output), ideal for medium to large garages, workshops, and commercial spaces.
Q: What efficiency rating does this unit heater offer?
A: The UDX100 operates at up to 83% thermal efficiency (AFUE), helping reduce energy costs.
Q: What fuel type does the NUDX100 use?
A: It runs on natural gas and can be converted to propane with an optional conversion kit.
Q: Is the Reznor UDX100 power vented?
A: Yes, it features power venting, which minimizes heat loss and improves overall efficiency.
Q: What makes the heat exchanger durable?
A: It includes a TCORE2 titanium-stabilized aluminized steel heat exchanger for long-lasting, corrosion-resistant performance.
Q: How efficient is the airflow system?
A: It uses an axial propeller fan delivering ~1345 CFM, ensuring consistent and even heat distribution.
Q: Is installation and maintenance easy?
A: Yes, it features external wiring access, LED diagnostics, and multiple suspension options for simplified installation and servicing.
Q: What applications is this heater best for?
A: Ideal for garages, warehouses, workshops, and light industrial environments needing reliable, high-performance heating.
Maintenance Tips
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Clean heat exchanger annually: Maintain the TCORE2® aluminized steel exchanger to prevent carbon buildup and keep ~83% efficiency.
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Inspect burner & ignition system: Check direct spark ignition and flame sensor for safe, reliable startup.
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Ensure venting is clear: Power-vented system must remain unobstructed to avoid heat loss and exhaust issues.
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Check fan & airflow: Clean axial propeller fan and confirm proper airflow (~1300+ CFM) to prevent overheating.
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Inspect motor & wiring: Verify 115V electrical connections and sealed control compartment components are secure.
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Monitor LED diagnostics: Use onboard fault code display for quick troubleshooting and preventive maintenance.
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Keep unit dust-free: Essential for garages/workshops to maintain airflow and combustion quality.
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Schedule annual professional service: Extends lifespan and ensures safe commercial/industrial operation.
