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A Guide to Reznor Garage Heaters

When it comes to heaters, few brands can boast the same level of experience as Reznor. Ever since it started in 1888, Reznor HVAC has 130 years of rich history making HVAC products, both for residential and industrial use. 

The company has built a reputation for high-quality and reliable products covering heating, cooling and ventilation needs. More than just a leading brand, Reznor founded several industry firsts, such as the first gas-fired unit heater in the US in 1920, as well as the first gas-fired industrial heater in 1935.

Reznor’s Garage Heaters

Reznor’s products have a well-deserved reputation for rugged reliability and longevity, and their garage heaters are no exception. Our Reznor garage heater lineup comes in a wide range of BTU models to suit different spaces, from 30,000 all the way to 400,000 BTU and options for both residential and commercial applications.

Each heater also boasts a sleek build and redesigned heat exchangers that offer industry-leading performance, worthy of the storied brand.

Reznor offers five lines of unit heaters:

Model Line Description Fan type Application Availability
UBX Power vented high-static unit heaters  Blower Commercial

Industrial

Special Order
UBZ Separated combustion high-static unit heaters  Blower Commercial

Industrial

Special Order
UDX Power vented low-static unit heaters Axial Commercial

Industrial

Residential

In Stock
UDZ Separated combustion low-static unit heaters  Axial Commercial

Industrial

Residential

In Stock
UEZ Separated combustion low-static unit heaters  Axial Commercial

Industrial

Residential

Special Order

Static Pressure

Static pressure is basically the air resistance in the space to be heated. 

A high-static area is one where there is higher air resistance, due to the inherent design of the room, filters, or ductwork. This requires a high-static heater to service the space more efficiently.

A low-static area is one with low airflow, due to tighter home envelopes or oversized trunk lines. A low-static heater is enough for such spaces.

Fan type

An axial fan is one where the blades spin around a central shaft to pull in air. They generally have a high flow rate, but low pressure. They also require less power to run.

A blower or centrifugal fan works differently: it pulls in air from a side intake and blows it out through a 90-degree angle duct. The result is a lower flow rate due to the ductwork, but higher airflow pressure. This allows them to generate a steadier flow of air at the cost of higher energy consumption.

Our Reznor Garage Heater Selection

For small spaces and single carports

Reznor UDX-30 and UDX-45 Power Vented Gas Fired Unit Heater

Reznor UDX-30 and UDX-45 Power Vented Gas Fired Unit Heater

These single-stage gas-fired heaters boast a best-in-class 82% thermal efficiency, thanks to Reznor’s patented heat exchangers made of titanium-stabilized aluminized steel. A newly designed circuit board allows for fan-only operation without the need to add relays.

All these are packaged in a sleek design that does away with messy hardware: everything is hidden behind an easily accessible hinged door, while external LED lights indicate the unit’s status.

The UDX-30 has a 30,000 BTU output, while the UDX-45 is good for up to 45,000 BTU.

Reznor UDX-30 30,000 BTU Power Vented Gas Fired Unit Heater
Price: $1,149.00 Reznor UDX-30 30,000 BTU Power Vented Gas Fired Unit Heater

For a long time Reznor has been providing the best heaters for a variety of applications. Reznor has improved their already industry leading technologies with...

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Reznor UDX-45 45,000 BTU Power Vented Gas Fired Unit Heater
Price: $1,199.00 Reznor UDX-45 45,000 BTU Power Vented Gas Fired Unit Heater

For a long time Reznor has been providing the best heaters for a variety of applications. Reznor has improved their already industry leading technologies with...

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For medium spaces and garages

Reznor UDX-30 and UDX-45 Power Vented Gas Fired Unit Heater

Reznor UDX-60 and UDX-75 Power Vented Gas Fired Unit Heaters

Like their lower BTU cousins, these higher capacity single-burner unit heaters have the best-in-class thermal efficiency rating (82-83%). 

Installation is a breeze: the gas line input is located on the backside for convenient connection, and the whole unit can be installed from 2 or 4 suspension points, or mounted on the ceiling with an optional hanger kit. 

The UDX-60 is capable of 60,000 BTU, while the UDX-75 goes up to 75,000 BTU.

Reznor UDX-60 60,000 BTU Power Vented Gas Fired Unit Heater
Price: $1,229.00 Reznor UDX-60 60,000 BTU Power Vented Gas Fired Unit Heater

For a long time Reznor has been providing the best heaters for a variety of applications. Reznor has improved their already industry leading technologies with...

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Reznor UDX-75 75,000 BTU Power Vented Gas Fired Unit Heater
Price: $1,289.00 Reznor UDX-75 75,000 BTU Power Vented Gas Fired Unit Heater

For a long time Reznor has been providing the best heaters for a variety of applications. Reznor has improved their already industry leading technologies with...

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For larger spaces and multi-car garages

Reznor UDX-30 and UDX-45 Power Vented Gas Fired Unit Heater

Reznor UDX-100 and UDX-125 Power Vented Gas Fired Unit Heaters

Like the rest of the UDX lineup, these high BTU unit heaters have industry leading thermal efficiency ratings thanks to Reznor’s unmatched heat exchangers and proprietary design.

The UDX-125 represents the upper limit for residential spaces, but UDX heaters that can output 150,000 BTUs and up are also available for commercial applications. 

The UDX-100 can go up to 100,000 BTU, while the UDX-125 is good for up to 125,000 BTU.

Reznor UDX-100 105,000 BTU Power Vented Gas Fired Unit Heater
Price: $1,449.00 Reznor UDX-100 105,000 BTU Power Vented Gas Fired Unit Heater

For a long time Reznor has been providing the best heaters for a variety of applications. Reznor has improved their already industry leading technologies with...

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Reznor UDX-125 120,000 BTU Power Vented Gas Fired Unit Heater
Price: $1,599.00 Reznor UDX-125 120,000 BTU Power Vented Gas Fired Unit Heater

For a long time Reznor has been providing the best heaters for a variety of applications. Reznor has improved their already industry leading technologies with...

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For commercial and industrial applications

Reznor UDX-30 and UDX-45 Power Vented Gas Fired Unit Heater

Reznor UDX-125 to UDX-400 Power Vented Gas Fired Unit Heaters

For larger spaces that require reliable heating, Reznor remains one of the most trusted names. The UDX line can go all the way up to a mammoth 400,000 BTU.

For such demanding applications, Reznor’s reputation for reliability matters. The stock Core² titanium-stabilized aluminized steel heat exchanger can be upgraded to 316 or 409 stainless steel for ultra heavy-duty applications. 

The blower has a full fan guard, and the unit comes with a host of safety features such as internal overload protection for the fan, multi-try direct spark ignition with timed lockout, and a sleek one-piece design that hides all hardware inside the rugged chassis.

Here are the Reznor unit heaters we carry for commercial and industrial applications:

Model Capacity
UDX-125 125,000 BTU
UDX-150 150,000 BTU
UDX-175 175,000 BTU
UDX-200 200,000 BTU
UDX-225 225,000 BTU
UDX-250 250,000 BTU
UDX-300 300,000 BTU
UDX-350 350,000 BTU
UDX-400 400,000 BTU

Reznor Optional Heater Accessories

Reznor heaters offer unparalleled flexibility. These optional accessories allow for different mounting options, venting, fuel sources, or heat exchanger longevity.

For mounting

Quick Sling QSWI3000 Flush Mount Unit Heater Bracket - 200 lbs Max
Price: $219.00 Quick Sling QSWI3000 Flush Mount Unit Heater Bracket - 200 lbs Max

The QSWI3000 supports unit heaters up to 200 lbs. The Quick-Sling Bracket makes installing your unit heater quick and easy. It mounts flush to the ceiling ...

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For venting

4" Horizontal Unit Heater Vent Kit - Category III Stainless Steel
Price: $399.00 4" Horizontal Unit Heater Vent Kit - Category III Stainless Steel

Unit heaters require category III stainless steel special gas venting in order to be vented outside. This simple kit includes a variety of venting options that ...

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4" Vertical Unit Heater Vent Kit with Vent Cap
Price: $229.00 4" Vertical Unit Heater Vent Kit with Vent Cap

Unit heaters require type B venting in order to be vented outside. This simple kit includes a variety of venting options that will be enough for most users. Thi...

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For propane conversion

Reznor 1036538R LP Kit for UDX/UDZ 100-125 and UBX/UBZ 100-125
Price: $109.00 Reznor 1036538R LP Kit for UDX/UDZ 100-125 and UBX/UBZ 100-125

The 1036538R LP conversion kit easily transforms Reznor UDX/UDZ and UBX/UBZ models sized 100k - 125k BTUH into propane fired heaters. The kit includes al...

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Heat exchanger

  • Heat Exchanger Upgrade to 316 or 409 Stainless Steel – contact us

For higher altitudes

  • Pressure Switch (197032) for installations above 6,000 ft. – this item replaces the UDAP-100 switch

At Total Home Supply, we offer extended 9-year non-prorated warranty on the heat exchanger, burners, and flue collection box assembly. We also provide an extended 4-year non-prorated warranty for all electrical and mechanical components of your Reznor unit heater. 

And as with all of our products, our Reznor garage heaters ship for free. So take a look at our wide selection today!

Mickey Luongo

Mickey is the resident heating and air conditioning expert with over 15 years of experience in the industry.

10 thoughts on “A Guide to Reznor Garage Heaters”

    1. Mickey Luongo says:

      It depends on the space. The UDZ pulls in combustion air from outside which is good if the space is really well sealed or if you are using any combustible materials in the space like paint or saw dust. If not, the UDX is a great choice.

      1. Sandy Friedman says:

        Thanks…I have a 1400+sq ft insulated pole building used as a dog training center. Nothing flammable so the UDX-100 would be the best option?

  1. I am building a 1200 square foot garage. Fully insulated but winters are cold here. What model and size of area or unit do you recommend.

  2. Kenneth Mullozzi says:

    I live in a 24 unit condo Bldg we have 4 Reznor UDAP -400 heaters in our ground level garage 1 needs replacement temperature is fine in garage with the 3 working ? Should we replace with recommended udx-400 ? We have a board member that was a architect and he says we have to replace

  3. Bryant Bray says:

    we recently constructed a 3500 sq ft steel building. We would like a reznor heater that an if we choose in the future could be converted to natural gas. Which model # works the best and what kind of ducting is needed and where can we purchase it? Thanks

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