Customer Reviews

Reznor UDX 45,000 BTU Natural Gas Unit Heater



In stock




100% of 100
Availability: In Stock - Ready to Ship

Authorized Reznor Dealer

Suggested Retail $1,728.00 Your Low Price Special Price $1,115.00
Free Shipping
Accessories for this product
Call 1-800-397-1392 for Best Pricing
Customer Reviews
BBB Rating
Best Pricing


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.

Standard Features

  • 83% AFUE Efficiency
  • TCORE2 Titanium-Stabilized Aluminized Steel Heat Exchanger
  • Multi-Try Direct Spark Ignition with Time Lockout
  • Low Noise Operation with Vibration-Isolated Fan and Venter Motors
  • Status-Indicating LED Light
  • 7-Segment Display Board for Simple Troubleshooting
  • Optional Integrated Downturn Nozzle and Integrated Vertical Louvers
  • 2- and 4-Point Suspension Options
  • External Gas Connection for Ease of Maintenance and Installation
  • Includes 3 Horizontal Louvers
  • ETL Approved

Product Note

Reznor UDAP is the legacy model of the Reznor UDX

Product Specifications

More Information
Reznor UDX 45,000 BTU Natural Gas Unit Heater
Weight (in lbs)68.000000
Additional InformationAir Throw: 40 Feet
Furnace Efficiency / AFUE 80-85%
Heating BTU40,000-49,999
Maximum CFM629
Decibel Level (dBA)40dB at 15ft
Propeller Diameter10 inches
Flue Location4"
Watt155 Watts
SEER2 (Efficiency)22.3
Electrical115 Volt 1 Phase 60 Hertz
Amperage Requirement2.4 Amps
Connection1/2" NG/LP Connection to Gas Valve
Fuel TypeNatural Gas
Height13 3/4"
Depth29 3/4"
Warranty9 Year Heat Exchanger, Burner, and Flue Collection Box Assembly; 4 Year All Electrical and Mechanical Components
Resources You will need Adobe® Acrobat® Reader to view PDF documents.
Safety InformationPROPOSITION 65 WARNING

Reviews 6

Write Your Own Review
You're reviewing:Reznor UDX 45,000 BTU Natural Gas Unit Heater
Your Rating

Questions and Answers

Customer Questions
Would this work for a 3 stall garage?
This heater should work for a 3-car garage. But just to be safe, you should cross-reference with the Quick Sizing Calculator at the bottom of our Sizing Guide (located at the top of our site). If you have any further questions, please call us and we will be happy to assist you.
Is this a sealed combustion heater?
Please reference our Sizing Guide that will allow you to know exactly what kind of unit you'll be needing as there are many determining factors such as insulation quality, location, etc... If you have any further questions please feel free to give us a call! Thanks.
Did you find what you were looking for?


Our mission is simple: To provide an open HVAC marketplace online, offering the best HVAC brands directly to the public, based on real, affordable prices. For too long, local dealers have charged whatever they could get away with - but now YOU HAVE A CHOICE.


Choose us for:

  • Real recommendations on only what you need (no upsells)
  • Real wholesale prices, never inflated
  • Real advice & tech support from experts in home heating & cooling
Money Icon


We sell products at wholesale pricing. No markups, no hidden fees. Our average customer saves BETWEEN THREE TO SIX THOUSAND DOLLARS
-That's the Direct Advantage!

Best Brands


Just because a brand is nationally known, doesn't mean it's the best. Our HVAC technicians have hand-selected the most efficient and durable products for American homeowners, giving you exactly what you need at the best pricing.



We choose products with long, best-in-the-market warranties by manufacturers with great customer service and solid reputations. This gives you peace of mind that you'll be getting a great quality product.

Huge Savings
Read about a real life example from one of our
customers who saved thousand.

We've helped over 100,000 American homeowners and earned their trust.

See What Our Customers are Saying