Reznor UDX 75,000 BTU Natural Gas Unit Heater - NUDX75

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

• 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.
• 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.
• 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.
• Quiet and comfortable operation
  A vibration-isolated fan system keeps noise levels low (~49 dB), making it suitable for active workspaces where comfort matters.
• 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.
• 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.
• 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

• Clean heat exchanger yearly: The TCORE2® aluminized steel exchanger should stay dust/carbon-free to maintain ~83% efficiency and prevent overheating.
• Inspect burner & ignition system: Check multi-try direct spark ignition and flame sensor for consistent startup and safe combustion.
• Clear venting system: Ensure power-vent flue is unobstructed to avoid heat loss and airflow issues.
• Check fan & motor performance: Clean axial fan blades and inspect vibration-isolated motors for quiet, efficient airflow.
• Tighten gas & electrical connections: External gas connections and wiring should remain secure and leak-free.
• Monitor LED diagnostics: Use onboard display/LED indicators for early fault detection and troubleshooting.
• Keep unit clean (dust/debris): Prevent airflow restriction and maintain consistent heating output.
• Annual professional service: Extends lifespan, protects warranty (up to 9-year heat exchanger), and ensures safe operation.