Reznor UDX 225,000 BTU Natural Gas Unit Heater - NUDX225

Reznor UDX 225,000 BTU Natural Gas Unit Heater - NUDX225

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

• Built for serious heating demands
  With 225,000 BTU output, this unit is engineered for large commercial or industrial spaces like warehouses, workshops, and garages—delivering consistent, high-capacity heat.
• Efficient performance that balances power & cost
  Operating at ~82–83% AFUE, it offers a strong balance between fuel efficiency and high-output heating—ideal for businesses that need reliable warmth without excessive energy waste.
• Durability you can rely on long-term
  The TCORE2 titanium-stabilized aluminized steel heat exchanger is designed for longevity and resistance to corrosion, making it a dependable investment in demanding environments.
• Smart, service-friendly design
  Features like a 7-segment diagnostic display, LED status indicators, and external gas connection simplify maintenance and troubleshooting—saving time for installers and technicians.
• Quiet operation for large spaces
  Despite its power, the vibration-isolated fan and motor system keeps noise levels relatively low, making it suitable even for occupied work areas.
• Flexible installation options
  With power venting, multiple suspension points, and optional airflow accessories, it adapts easily to different layouts and ventilation setups.
• Strong air circulation coverage
  High airflow and long air throw (up to ~90 ft) ensure heat is distributed evenly across wide areas—reducing cold spots.

Q&A

Q: What is the heating capacity of the Reznor UDX225?
A: It delivers 225,000 BTU of powerful heating, ideal for large garages, workshops, and commercial spaces.

Q: What efficiency rating does this unit heater offer?
A: The UDX225 operates at up to 82–83% AFUE efficiency, helping reduce energy costs.

Q: What type of fuel does the NUDX225 use?
A: This model runs on natural gas and can be converted to propane with an optional kit.

Q: Is the Reznor UDX225 power vented?
A: Yes, it features power venting, minimizing heat loss and improving overall efficiency.

Q: What makes the heat exchanger durable?
A: It uses 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 provides low-noise operation (~52 dB).

Q: Is installation and maintenance easy?
A: Yes, it includes external gas connections, suspension options, and diagnostic LED display for easy setup and servicing.

Q: What applications is this heater best for?
A: Ideal for commercial buildings, warehouses, and large residential garages needing reliable, high-output heating.

Maintenance Tips

• Clean heat exchanger annually: Prevent dust/carbon buildup to maintain ~83% efficiency and avoid overheating.
• Inspect burner & ignition system: Check direct spark ignition and flame sensor for reliable startup and safe operation.
• Check venting & flue: Ensure power-vent system is clear to prevent heat loss and exhaust blockages.
• Lubricate & inspect fan motor: Keep axial fan and vibration-isolated motors running smoothly for proper airflow.
• Tighten gas & electrical connections: External gas connections and wiring should be leak-free and secure.
• Monitor LED diagnostics: Use onboard display for early fault detection and troubleshooting.
• Replace filters / keep unit clean: Prevent airflow restriction and maintain heating performance.
• Schedule professional servicing yearly: Ensures safety, efficiency, and extends heat exchanger life (key long-term component).