Reznor UDX 225,000 BTU Propane Unit Heater - NUDX225,N1036540R

Reznor UDX 225,000 BTU Propane Unit Heater - NUDX225,N1036540R

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

• Strong, versatile heating performance
  With 225,000 BTU input, this unit hits the sweet spot for medium-to-large commercial spaces—powerful enough for warehouses and workshops without the excess of oversized industrial units.
• Propane flexibility for off-grid or rural use
  Designed for liquid propane (LP) operation (via included conversion kit), it’s ideal where natural gas isn’t available—offering installation flexibility across more locations.
• Reliable efficiency for daily operation
  Operating at around 82–83% AFUE, it delivers consistent heat with reasonable fuel consumption, making it a practical long-term solution.
• Durable heat exchanger design
  The TCORE2 titanium-stabilized aluminized steel heat exchanger ensures long service life in demanding environments, reducing replacement risk.
• Balanced airflow & coverage
  Producing roughly ~2,200+ CFM with up to ~90 ft air throw, it provides even heat distribution across wide floor areas.
• Quiet, workspace-friendly operation
  Built with vibration-isolated motors, it keeps noise levels around ~52 dB, which is low for a unit of this capacity.
• Smart controls & easy servicing
  Features like a 7-segment display and LED diagnostics make troubleshooting faster, helping reduce downtime and maintenance costs.
• Installer-friendly, power-vented design
  Power venting minimizes heat loss and allows flexible venting options, while external gas connections simplify installation and servicing.

Q&A

Q1: What size space can the Reznor UDX225 propane heater heat?
A: With 225,000 BTU input, it’s ideal for large garages, warehouses, workshops, and commercial spaces needing powerful, consistent heating.

Q2: How efficient is the Reznor UDX225?
A: It delivers up to 82–83% AFUE efficiency, ensuring strong heat output with reduced energy waste.

Q3: What fuel type does this model use?
A: This unit operates on liquid propane (LP) and includes a factory-approved conversion kit (N1036540R) for proper setup.

Q4: Is the UDX225 suitable for commercial applications?
A: Yes, it’s designed for commercial and industrial heating, including shops, distribution centers, and large enclosed areas.

Q5: What makes the Reznor UDX225 durable?
A: It features a TCORE2 titanium-stabilized aluminized steel heat exchanger, built for long-term durability and corrosion resistance.

Q6: How effective is airflow and heat distribution?
A: The unit provides up to ~2,200+ CFM airflow with an air throw of ~90 feet, ensuring even heat coverage across large spaces.

Q7: Does the unit operate quietly?
A: Yes, it includes a low-noise axial fan with vibration-isolated motors, reducing operational sound levels.

Q8: Is installation and maintenance easy?
A: The heater features external gas connections, LED diagnostics, and a digital control board, simplifying installation and servicing. 

Maintenance Tips

• Clean fan & airflow components: Remove dust from the axial propeller fan and louvers to maintain strong airflow (~2242 CFM) and even heat distribution.
• Inspect heat exchanger annually: Check the TCORE2® aluminized steel exchanger for cracks or corrosion to ensure safe combustion and long-term durability.
• Check ignition & propane system: Test the direct spark ignition and verify propane pressure/connections to avoid misfires and efficiency loss.
• Keep venting system clear: Ensure the power vent and 5" flue outlet are unobstructed to prevent exhaust buildup and maintain efficiency.
• Monitor electrical components: Inspect wiring, LED diagnostics, and control board; tighten loose connections to prevent operational faults.
• Inspect fan & motor performance: Ensure vibration-isolated motors run smoothly and quietly (≈52 dB) to reduce wear and noise.
• Check gas conversion components (if applicable): Ensure LP conversion kit (N1036540R) is properly installed and calibrated for safe propane operation.