Reznor UDX 175,000 BTU Natural Gas Unit Heater - NUDX175
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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Perfect mid‑range commercial heater
The Reznor UDX 175,000 BTU Natural Gas Unit Heater (NUDX175) delivers solid heating power for medium‑to‑large spaces like workshops, garages, and warehouses—ideal when you need more capacity than smaller models without oversizing.
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Efficient performance you can count on
With ~83 % AFUE efficiency, it balances strong heat output with reasonable fuel use, helping control operating costs in daily commercial service.
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Durable, industrial‑ready design
The TCORE2 titanium‑stabilized aluminized steel heat exchanger is built for long‑term reliability under high‑usage conditions—critical for commercial environments.
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Easy troubleshooting & maintenance
Features like a 7‑segment display board and LED status indicators make diagnostics fast and maintenance more efficient, reducing downtime.
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Balanced airflow & wide heat coverage
Generating ~2,200 CFM airflow with up to ~90 ft air throw, it ensures even heat distribution across your space.
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Quiet, workspace‑friendly operation
Designed with a vibration‑isolated axial fan and venter motors, it keeps noise levels reasonable (~52 dB), even during heavy duty heating
Q&A
Q1: What size space can the Reznor UDX175 heat?
A: With 175,000 BTU input and ~145,000 BTU output, this natural gas unit heater is ideal for large garages, shops, warehouses, and commercial/industrial spaces needing robust heat.
Q2: How efficient is the UDX175?
A: It offers up to ~83 % AFUE thermal efficiency, helping reduce fuel use while delivering strong heat performance.
Q3: What fuel type does this model use?
A: This unit operates on natural gas, designed for power‑vented ducted installations.
Q4: Is the UDX175 still current?
A: The Reznor UDX175 has been discontinued and replaced by the updated Reznor UDXC‑175 series (convertible/separated combustion models).
Q5: What durability features does it include?
A: It features a TCORE2 titanium‑stabilized aluminized steel heat exchanger, multi‑try direct spark ignition, and a vibration‑isolated fan and venter motor for long life and quieter operation.
Q6: How effective is airflow?
A: The heater delivers up to ~2,240 CFM airflow with ~90 ft air throw, ensuring even heat coverage in large spaces.
Q7: Is maintenance and troubleshooting easy?
A: Yes — it includes a status LED and 7‑segment diagnostic display for simplified maintenance and service checks.
Q8: What are the electrical and mounting requirements?
A: Runs on 115 V single‑phase power, supports 2‑ or 4‑point ceiling suspension mounting, and uses a power vent configuration.
Maintenance Tips
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Clean fan & airflow components: Remove dust from the axial propeller fan, louvers, and intake areas to maintain strong airflow (~2100 CFM) and even heat distribution.
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Inspect heat exchanger annually: Check the TCORE2® aluminized steel exchanger for cracks or corrosion to ensure safe combustion and long-lasting performance.
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Check ignition & gas system: Test direct spark ignition and verify natural gas pressure and connections to prevent misfires or inefficiency.
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Maintain venting system: Ensure the power vent and flue outlet are free from obstructions to avoid heat loss and unsafe exhaust buildup.
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Monitor electrical components: Inspect wiring, LED diagnostics, and control board; tighten loose connections to maintain reliable operation.
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Check fan & motor performance: Ensure vibration-isolated motors run smoothly and quietly to prevent wear and maintain airflow.
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Schedule annual professional service: Maintains ~83% efficiency, safe operation, and heat exchanger warranty compliance (up to 9 years).
