Reznor UDX 350,000 BTU Natural Gas Unit Heater - NUDX350
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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Maximum heating power for very large spaces
With 350,000 BTU input, this model is built for heavy-duty commercial and industrial environments—ideal for large warehouses, factories, and aircraft hangars where consistent high-output heat is critical.
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Reliable efficiency at scale
Delivering around 82–83% AFUE, it offers strong energy performance for its size class, helping balance fuel costs with powerful heating output.
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Engineered for long-term durability
The TCORE2® titanium-stabilized aluminized steel heat exchanger is designed to withstand demanding, high-use environments—key for industrial reliability.
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High airflow & wide coverage
With airflow reaching up to ~4,400+ CFM and ~90 ft air throw, it ensures broad, even heat distribution across expansive spaces.
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Quiet operation for its size
Despite its output, vibration-isolated fan and motor design helps keep noise levels manageable—important for active work environments.
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Smart diagnostics & maintenance-friendly
Features like a 7-segment display and LED diagnostics make troubleshooting faster, reducing downtime and service costs.
Q&A
Q1: What size area can the Reznor UDX350 heat?
A: With 350,000 BTU input and ~290,500 BTU output, it’s designed for large warehouses, factories, garages, and commercial spaces requiring high-capacity heating.
Q2: How efficient is the Reznor UDX350?
A: It delivers up to 82–83% AFUE efficiency, balancing strong heat output with energy savings for commercial applications.
Q3: What fuel type does this unit heater use?
A: The UDX350 runs on natural gas and can be converted to propane (LP) using an optional conversion kit.
Q4: Is the UDX350 suitable for industrial use?
A: Yes, it’s built for commercial and industrial heating, including workshops, distribution centers, and large open facilities.
Q5: What makes the Reznor UDX350 durable?
A: It features a TCORE2 titanium-stabilized aluminized steel heat exchanger, designed for corrosion resistance and long service life.
Q6: How powerful is the airflow and heat distribution?
A: The unit delivers up to ~4,400+ CFM airflow with an air throw around 90 feet, ensuring even heating across large spaces.
Q7: Does the UDX350 operate quietly?
A: Yes, it includes a low-noise axial fan and vibration-isolated components, reducing operational noise in large environments.
Q8: Is installation and maintenance easy?
A: The heater is designed with external gas connections, LED diagnostics, and a digital control board, making installation and troubleshooting simple.
Maintenance Tips
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Keep airflow components clean: Regularly remove dust from propeller fan, louvers, and intake areas to maintain strong air throw (≈90 ft) and efficiency.
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Inspect heat exchanger yearly: Check the TCORE2® aluminized steel exchanger for cracks or corrosion to ensure safe, high-output operation (≈83% efficiency).
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Verify ignition & gas system: Test direct spark ignition, gas pressure, and connections to prevent startup failures and uneven heating.
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Maintain venting system: Ensure power vent and flue are unobstructed to avoid heat loss and dangerous exhaust buildup.
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Check electrical & diagnostics: Monitor LED indicators and control board for faults; tighten wiring connections to prevent downtime.
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Inspect fan & motor performance: Listen for unusual noise and ensure vibration-isolated motors run smoothly for consistent airflow.
