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).
