• Reznor UDX 225,000 BTU Natural Gas Unit Heater - NUDX225
  • Reznor UDX 225,000 BTU Natural Gas Unit Heater - NUDX225
  • Reznor UDX 225,000 BTU Natural Gas Unit Heater - NUDX225
  • Reznor UDX 225,000 BTU Natural Gas Unit Heater - NUDX225
  • Reznor UDX 225,000 BTU Natural Gas Unit Heater - NUDX225
  • Reznor UDX 225,000 BTU Natural Gas Unit Heater - NUDX225
  • Reznor UDX 225,000 BTU Natural Gas Unit Heater - NUDX225
  • Reznor UDX 225,000 BTU Natural Gas Unit Heater - NUDX225
  • Reznor UDX 225,000 BTU Natural Gas Unit Heater - NUDX225
  • Reznor UDX 225,000 BTU Natural Gas Unit Heater - NUDX225

Reznor UDX 225,000 BTU Natural Gas Unit Heater - NUDX225

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  • Full Interior Kit
  • Since 2009

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).

  • DIY Install

  • OEM-Inspired Fit

  • Air Bag Friendly

  • 3 Year Warranty

  • Custom Colors

  • Work Gear & Pet Friendly

  • Since 2009

Why Truck Owners Choose Seat Covers Over Reupholstery

Traditional Reupholstery TruckLeather Seat Covers
Upfront Cost

$2500-$4000+

$399-$999

Vehicle Downtime

Days or Weeks

None

Risk Level

Permanent, No Undo

Fully Reversible

Best Use Case

Full Restorations

Restoration or Prevention

Resale Value Impact

High Cost to Recover

High ROI

TruckLeather gives you 90% of the visual and comfort upgrade at a fraction of the cost of reupholstery without giving up your truck.

WHEN YOUR TRUCK DESERVES THE BEST. UPGRADE YOUR TRUCK'S INTERIOR WITH THE INDUSTRY DEFINING TRUCK SEAT COVERS WE HAVE REFINED OVER 15 YEARS.

  • Will these work if my seats are already damaged?

    Yes. TruckLeather seat covers are commonly used to cover cracked, faded, or worn-out truck seats while preventing further deterioration.

  • How do these compare to cheaper seat covers?

    Universal covers focus on price. TruckLeather focuses on fit, durability, and long-term protection.

  • Are these permanent?

    No. They’re fully removable and won’t alter your factory seats.

Slip on leather seat covers
Slip on leather seat covers

Easy At-Home Installation

No special tools. No upholstery shop. No risk.

Our seat covers are designed for DIY installation, with step-by-step instructions and support available if you need it. Most customers complete installation in a few hours.

STEP BY STEP INSTRUCTIONS
Red and Black Custom Leather Seat Covers for Ford F150

Your Truck.Your Style.

Custom orders are our jam. Our custom program makes for a truly bespoke experience leaving only your imagination for the thousands of possibilities. If you're looking for the best truck seat covers then look no further!

Clazzio seat cover

Airbag Safe

Our seat cover construction has a high priority for allowing the OEM seat airbags to properly deploy when needed.

The proprietary thread design allows for the SRS systems to continue to function in a collision situation.

Clazzio Leather Covers

Made for your truck.For life.

Our seat covers are made exactly for your interior setup, perfect every time.

We offer most color setups in stock such as all black and all dark gray, however our custom color program is ready for your creative setups.

FAQ

Learn more about our truck seat covers with the frequently asked questions below.

DIY installation instructions are included for your specific application and takes around 2-3 hours for full interior installation.

The specific application specific instructions provided have step by step photos of how to install your new seat covers as well as tips and tricks. 

If you don't feel comfortable installing the seat covers yourself, then any local upholstery shop should be able to install them no problem.

Some vehicles do require cutting in certain spots like the power seat control panel, but nothing too major.

These leather seat covers are 100% slip on seat covers and do not require removal of your existing seat material.

Yes, our seat covers are fully compatible with factory heated and cooled seats.

Clazzio (our manufacturer) offers a 3 year warranty that is honored on any manufacturer defects.  This does not include normal wear and tear that comes with use on these seat covers.

You will receive the full interior seat cover set which includes bottom cushion covers, top cushion covers, head rest covers, and depending on the vehicle, arm rest covers.  It is a total makeover.

They are made by 11i-USA who manufactures these under the name Clazzio. They operate a large dealer system and we are a top nationwide dealer for them.

It depends if you ordered a custom set or not.


If you ordered a set that is in stock, then it will reach you in approximately 5-6 days via UPS ground (continental U.S.). Most all black or all dark gray sets are in stock, but we will let you know upon your order.


If you ordered a custom set, then it will take 8-10 weeks (occasionally longer) to arrive from Japan due to custom manufacturing, freight time, and US customs holding time.

Maybe! Contact us to see if your specific vehicle isn't listed on our site, or if you have any questions about the application.

We do have other applications such as passenger vehicles and two door cars as well. Just contact us!

Need just a bottom cushion replacement or another single piece? Contact us for pricing.

We can also supply just the front or rear seats if that is all you need.

Since our seat covers are manufactured for every application specifically, they account for features like these in your interior. Our development team uses a laser guided measuring system to ensure the best fitment for our seat covers.

For straps to fold down seats, they will include a cutout for those to loop through.  For bottom plastic trim on your front seats, the covers are meant to tuck in to those for a great, OEM+ fitment.

Yes, our seat covers are made with special stitching construction on our per application basis (not universal). The design allow for our covers to break at the specific points where the side airbags will detonate.

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