Reznor UDX 75,000 BTU Natural Gas Unit Heater - NUDX75
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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Perfectly sized for medium spaces
With 75,000 BTU, this unit hits the sweet spot for garages, workshops, and small commercial areas—powerful enough for consistent heating without oversizing.
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Reliable efficiency for everyday use
Operating at ~83% AFUE, it delivers solid fuel efficiency while maintaining strong heating output—ideal for users balancing performance and energy costs.
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Built to last in tough environments
The TCORE2 aluminized steel heat exchanger resists corrosion and wear, making it a dependable choice for dusty or high-use environments.
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Quiet and comfortable operation
A vibration-isolated fan system keeps noise levels low (~49 dB), making it suitable for active workspaces where comfort matters.
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Strong air circulation coverage
With up to 961 CFM airflow and ~57 ft air throw, it distributes heat evenly—reducing cold spots in mid-sized areas.
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Installer-friendly & easy maintenance
Features like LED diagnostics, 7-segment display, and external gas connection simplify servicing and troubleshooting—saving time and cost long-term.
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Flexible mounting & venting options
Supports ceiling or wall installation with power venting to reduce heat loss and adapt to different layouts.
Q&A
Q: What is the heating capacity of the Reznor UDX75?
A: It provides 75,000 BTU input (≈62,000 BTU output), ideal for garages, workshops, and small commercial spaces.
Q: What efficiency rating does this unit heater offer?
A: The UDX75 operates at up to 83% AFUE efficiency, helping reduce energy consumption.
Q: What fuel type does the NUDX75 use?
A: It runs on natural gas and can be converted to propane with a compatible kit.
Q: Is the Reznor UDX75 power vented?
A: Yes, it features power venting, which improves efficiency by minimizing heat loss through the flue.
Q: What makes the heat exchanger durable?
A: It includes a TCORE2 titanium-stabilized aluminized steel heat exchanger for long-lasting performance.
Q: How quiet is this unit heater?
A: Designed with vibration-isolated motors, it operates at low noise levels (~49 dB) for quieter performance.
Q: Is installation and maintenance easy?
A: Yes, it offers external gas connections, multiple mounting options, and LED diagnostics for simple installation and servicing.
Q: What applications is this heater best for?
A: Perfect for residential garages, workshops, and light commercial spaces needing reliable heating.
Q: Does it include airflow features?
A: Yes, it uses an axial propeller fan with horizontal louvers for efficient air distribution (up to ~57 ft air throw).
Maintenance Tips
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Clean heat exchanger yearly: The TCORE2® aluminized steel exchanger should stay dust/carbon-free to maintain ~83% efficiency and prevent overheating.
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Inspect burner & ignition system: Check multi-try direct spark ignition and flame sensor for consistent startup and safe combustion.
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Clear venting system: Ensure power-vent flue is unobstructed to avoid heat loss and airflow issues.
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Check fan & motor performance: Clean axial fan blades and inspect vibration-isolated motors for quiet, efficient airflow.
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Tighten gas & electrical connections: External gas connections and wiring should remain secure and leak-free.
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Monitor LED diagnostics: Use onboard display/LED indicators for early fault detection and troubleshooting.
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Keep unit clean (dust/debris): Prevent airflow restriction and maintain consistent heating output.
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Annual professional service: Extends lifespan, protects warranty (up to 9-year heat exchanger), and ensures safe operation.
