Reznor UDX 150,000 BTU Propane Unit Heater - NUDX150,N1036539R
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, commercial‑grade heating power
With 150,000 BTU output, this propane unit is engineered to heat large garages, workshops, warehouses, and light industrial spaces efficiently and reliably.
-
Efficient and cost‑effective operation
Rated at ~83 % AFUE, it delivers excellent thermal efficiency for its class—maximizing heat output while minimizing propane fuel usage.
-
Durable construction for long service life
Features a TCORE2 titanium‑stabilized aluminized steel heat exchanger that resists corrosion and wear, helping ensure years of dependable performance in demanding environments.
-
Low‑noise, balanced airflow
The axial propeller fan with vibration‑isolated motors provides wide area heat distribution (up to ~73 ft throw) with relatively low noise (~51 dB), ideal for workspaces where comfort and quiet matter.
-
Service‑friendly diagnostics
Built‑in 7‑segment display and diagnostic LED make troubleshooting and maintenance quicker and easier—saving labor time and reducing downtime.
-
Flexible installation options
Power‑vented design and multiple hanging points allow adaptable ceiling or wall mounting, and external gas connections simplify installation choices.
Q&A
Q: What is the heating capacity of the Reznor UDX150?
A: It delivers 150,000 BTU input (~124,500 BTU output) of powerful heat, suitable for garages, workshops, warehouses, and commercial spaces.
Q: What fuel type does the NUDX150 use?
A: Designed for propane (LP) operation; many sellers include the propane/LP conversion option with model N1036539R.
Q: How efficient is this unit heater?
A: It achieves about 83 % AFUE thermal efficiency, helping maximize heat while minimizing fuel waste.
Q: What heat exchanger does it feature?
A: Includes a TCORE2 titanium‑stabilized aluminized steel heat exchanger for durability and extended life.
Q: What type of ventilation does it require?
A: It’s power‑vented, which reduces heat loss up the flue and improves overall performance.
Q: How quiet is the operation?
A: Equipped with vibration‑isolated fan and venter motors for low noise during operation.
Q: Is installation and maintenance straightforward?
A: Yes — it has LED fault codes/display, external gas connection, and flexible suspension options to simplify installation and service.
Q: What applications is this heater best for?
A: A strong choice for commercial, industrial, and large residential workshop/garage heating needs.
Maintenance Tips
-
Annual heat exchanger check: Inspect the TCORE2® aluminized steel heat exchanger for soot, cracks, or corrosion — crucial for efficiency (~83 % AFUE) and safety.
-
Clean burner & ignition components: Remove dust/debris from burner tubes; clean ignitor and flame sensor to ensure reliable ignition and proper flame quality.
-
Clear venting & combustion air paths: Ensure power‑vent flue and intake are free of obstructions to avoid backdrafting and maintain proper combustion.
-
Fan, blower & motor care: Clean fan blades, guard, and motor housing; check for imbalance or noise — good airflow prevents overheating and inefficiency.
-
Check electrical & gas connections: Tighten wiring, verify 115 V power integrity, and confirm propane supply and fittings are secure.
-
Monitor LED/diagnostics: Use status LEDs or fault codes to catch issues early before they become failures.
-
Keep unit exterior clean: Dust and debris around the heater reduce airflow and increase wear — wipe down regularly.
-
Professional annual service: A qualified HVAC tech should inspect valves, pressure switch, controls, and perform combustion analysis for peak performance.
Damage 
Loss 
Theft 
