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Reznor UDXC 350,000 BTU Natural Gas Unit Heater, Propeller Fan, Separated Combustion Convertible - Replaces UDX-350 / UDZ-350

Reznor UDXC 350,000 BTU Natural Gas Unit Heater, Propeller Fan, Separated Combustion Convertible - Replaces UDX-350 / UDZ-350
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Customer reviews
Rating:
4.9 out of 5
4.9 out of 5 View All 57  Reviews Add Your Review
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By

Reznor

In stock
Model

UDXC-350

ID

146978

Was $5,322.00 Your Low Price Special Price $3,276.00
 
4 Questions Answered

Introducing the new Reznor UDXC Universal, Gas-Fired Unit Heater. The Reznor model UDXC gas-fired unit heater is designed to provide safety, comfort, and efficiency to industrial, commercial, and residential buildings. The Reznor UDXC boasts a TCORE2 heat exchanger, featuring titanium-stabilized aluminized steel for long-lasting performance and efficient heating.


Included

  • Reznor UDXC 350,000 BTU Low Static Axial Fan Convertible Gas-Fired Unit Heater; Model UDXC-350

Built to last and look great. The UDXC also features a durable, two-tone, scratch-resistant paint finish. Clean rounded corners and edges and hidden fasteners enhance its modern design, making it ideal for industrial or residential use.

Standard Features

  • 350,000 BTU
  • Uses Axial Propeller Fan
  • 83% Thermal Efficiency
  • Field convertible to separated combustion
  • Sealed control compartment houses all electrical components
  • TCORE2 titanium stabilized aluminized steel heat exchanger
  • Vibration/noise isolated fan and venter motors
  • Certified for commercial/industrial heating applications

Product Note

Replaces UDX-350 / UDZ-350 / UDAP-350 / UDAS-350

More Information
Reznor UDXC 350,000 BTU Natural Gas Unit Heater, Propeller Fan, Separated Combustion Convertible - Replaces UDX-350 / UDZ-350
FeatureSpec
SKUUDXC-350
Weight (in lbs)348
Brand/ManufacturerReznor
ReplacesUDX-350
UPC663132524945
Furnace Efficiency / AFUE 80-85%
Heating BTU350,000 BTU
Maximum CFM4,483
Decibel Level (dBA)61
Flue Outlet6"
Watt1,086
Efficiency83%
Electrical115 Volt 1 Phase 60 Hertz
PhaseSingle Phase
Amperage Requirement11.0
Operating ModeHeating
Connection3/4" NG/LP Connection to Gas Valve
Fuel TypeNatural Gas
Height34 1/8"
Width41"
Depth48 29/32"
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
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Customers Say

Across multiple installations, owners report strong heating performance in spaces ranging from a 950 sq ft garage to a 60x40x16 shop and even a 35,000 cubic foot building, with examples including raising temperatures from 35°F to 70°F in 15–20 minutes, from 58°F to 70°F in 35 minutes, and maintaining 60°F in -11°F weather. Installation is frequently described as straightforward—sometimes taking about four hours or requiring only minor vent modifications—with quiet operation and reliable performance noted over three seasons, though one buyer received an incorrect conversion kit that was promptly replaced and another cited poor delivery handling.

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Top reviews
  1. Reznor UDX 60K
    Quality
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    Price
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    The unit was packaged well, and the installation was straightforward. It’s heated my workshop in Northern Michigan for three seasons now, and it’s been flawless.

    Review by

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  2. UDX200
    Quality
    100%
    Service
    100%
    Price
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    Great looking heaters, and performs wells. great service.

    Review by

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  3. Great support easy transaction
    Quality
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    Service
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    Great support and quality product will buy fromagain

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  4. Reznor 60K BTU
    Quality
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    HVAC Direct delivered on time and unit was incredibly packaged for freight. The unit itself is performing quite well in an uninsulated garage. Keeps everything from freezing. I could not be happier with this purchase and my purchase experience. I will definitely purchase from HVAC Direct when its time to heat my 30x40 barn.

    Review by

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  5. Outstanding product
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    Got a 46x60 shop with 16ft ceilings the reznor 150,000 btu heats it up fast runs quiet totally surprised how this unit performs

    Review by

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  6. Fast delivery, great price, excellent packaging with zero damage. Easy to install.
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    Ordered to replace an old UDAP 45. Basically the same but taller. Fit fine as a hanging unit in the garage. Quieter and warmer output than the old one. Pretty much just unhooked the old one, unmounted it and mounted the new one with the same bolts, reattached connections with a slight modification to the venting. Free shipping and it still got here in less than a week. Overall, great experience with HVACDirect and the price was the lowest I could find.

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  7. Great heater
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    Easy installation, quiet and works very well!

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  8. Great purchase
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    We just installed this unit today and it heated my shop up from 58degs. To 70degs. In 35 minutes. The shop is 60x40x16 high.

    Review by

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Customer Questions
If the green light is green flashing, what does that mean?
There are a variety of things that this could indicate. Refer to Table 26 on page 59 of the Reznor UDXC Installation and Maintenance Manual. If you have any further questions, please feel free to give us a call! Thanks.
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What type of venting do these unit heaters require? B-vent or PVC?
These units require Category I (B-vent) for vertical venting through the roof, or Category III for venting horizontally through side walls. The exhaust on these units exceeds a temperature that would allow for PVC Venting. If you have any further questions, please feel free to give us a call. Thanks!
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Can I use PVC pipe for the combustion air intake?
Reznor does not approve the use of PVC pipe for combustion air intake. Reznor only approves the use of the concentric venting, which is not compatible with PVC. Attempting to vent non-concentric can lead to pressure imbalances which would cause the pressure switch to intermittently turn the unit off. If you have any further questions, please feel free to give us a call. Thanks!
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What is the max length for B-vent to exhaust through the roof?
Please refer to pages 34-35 of the installation manual for vertical venting size constraints. This installation manual is linked on the Product Specifications tab for this unit and listed in the Resources section. If you have any further questions, please feel free to give us a call. Thanks!
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Best Unit Heaters to Buy in 2026
Unit heaters are compact, overhead heating systems perfect for garages, warehouses, and facilities with limited floor space. Choose gas-fired models for powerful, cost-effective heating in larger spaces; electric units for easy installation and zero emissions; or hydronic heaters for the lowest operating costs when you have an existing boiler system. Top picks for 2026 include the Modine Hot Dawg for residential garages, Modine PDP for commercial spaces, and Modine AMP Dawg for electric heating. HVACDirect.com offers the best selection from trusted brands like Modine, Reznor, and Sterling to keep your space warm all winter.
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