If you're searching for a way to keep your garage, warehouse, or facility warm, a unit heater is a great solution. These compact systems hang overhead and deliver heat right where you need it, making them ideal for where floor space is at a premium.
Unit heaters are a reliable, safe, and efficient heating solution that deliver warmth directly where you need it. Unlike traditional furnaces that push heat through ductwork, unit heaters generate heat right at the source. This makes them ideal for spaces where it's more practical to run a gas, electric, steam, or hot water line directly to the unit rather than installing extensive ductwork. The result is simpler installation and targeted heating without the complexity of a central system.
You can choose from three main fuel types: gas, electric, or hydronic.
Choose gas-fired unit heaters because:
- Costs are based on local energy prices, but gas heating is usually cheaper than electric heating – sometimes by more than 50%
- You need to heat a larger space – gas unit heaters usually have a wider BTU range than other fuel types when it comes to heating, providing the strongest output options
Choose electric unit heaters because:
- They are the easiest to install; electric lines require no venting and are easier to run than gas, steam, or water lines
- They are they a greener option with a lower carbon footprint with no exhaust; none of you power is lost as a byproduct, making them 100% energy efficient
- They are great for smaller spaces, being able to run at a lower output
Choose hydronic unit heaters because:
- They have the lowest operating costs
- You already have a boiler or hot water system running in your home or facility
- Like electric heaters, they need no additional venting to install
HVACDirect.com offers unit heaters from trusted brands like Modine, Reznor, and Sterling. We've picked the best unit heaters for 2026 and listed out some of their top features for you to use for reference. If you're unsure where to begin, our specialists are ready to help you find the right model for your space.
Best Gas-Fired Unit Heaters to Buy in 2026
Gas unit heaters are a smart pick for strong, affordable heat in a wider range of spaces, even being able to heat an entire garage on their own. They work well in tough environments where you need reliable, high-output heating.
Best Gas-Fired Unit Heaters for Residential Garages
Modine Hot Dawg HD/HDS
If you’re looking for a way to keep your garage or workshop warm all winter, the Hot Dawg series from Modine is a popular pick. Here are a few reasons why so many homeowners choose Hot Dawg to make their space comfortable.
- The low-profile ceiling mount keeps your floor space open for cars, tools, or projects.
- You’ll also get peace of mind with a 10-year warranty on the heat exchanger, so you know it’s built to last.
- These gas-fired heaters are known for delivering powerful, quiet heat, with models ranging from 30,000 to 125,000 BTUs.
The standard HD model is a great fit for most garages, but if you deal with dust or fumes, the HDS version is the way to go. It pulls in fresh air from outside, so your workspace stays clean and safe. Whether you're looking for some reliable heat in your garage or outfitting a heavier duty workspace, Hot Dawg heaters can safely accommodate a wide range of environments.
Reznor UDXC
The Reznor UDXC is one of the most versatile unit heaters on the market, and it's easy to see why it's trusted in garages, workshops, and commercial spaces alike. Here's what makes the UDXC stand out from the crowd:
- Available in sizes from 30,000 to 400,000 BTUs – this series provides the same top of the line industrial quality heaters at sizes that are certified for residential garage spaces.
- The TCORE2 titanium-stabilized heat exchanger, backed by an industry-leading warranty, ensures long-term durability.
- A modern two-tone design with rounded edges and concealed fasteners complements any environment.
The UDXC creates a productive workspace thanks to its quiet operation and vibration-isolated motors. The product is easy to manage and even includes status lights. Also, if your garage or workshop gets dusty or you work with fumes, the UDXC can be upgraded to pull in fresh air from outside instead of using indoor air. The UDXC delivers consistent, dependable, top-quality heat that is used in commercial spaces for residential ones as well.
Sterling GG
The Sterling GG unit heater is engineered for homeowners who demand premium performance and want to reclaim their garage for year-round use. These gas heaters are certified for residential garages and come in sizes from 30,000 to 120,000 BTUs, giving you plenty of options to match your space perfectly. The Sterling GG Series sets the standard for residential garage heating with features that outclass the competition.
- These unit heaters achieve 82% thermal efficiency, which means significantly lower heating costs compared to standard garage heaters. Superior efficiency translates directly to savings on your utility bills month after month.
- The hallmark feature: built-in separated combustion capability with no upgrade or conversion kit required. While other brands charge hundreds extra for conversion kits, the Sterling GG comes ready out of the box. This is invaluable if your garage gets dusty or you work with paint, solvents, or other fumes.
- The 321 stainless steel burner box withstands harsh conditions and resists oxidation, corrosion, and high temperatures.
The Sterling GG Series represents a premium investment in your workspace comfort. Whether you're working on a project car or running a workshop, the Sterling GG delivers professional-grade, dependable heat so you can work comfortably no matter the weather.
Best Gas-Fired Unit Heaters for Commercial & Industrial Use
Modine PDP
The Modine PDP series utilizes a tried-and-true clamshell design that’s been proven reliable for decades in the unit heater industry. These commercial and industrial-grade propeller units range from 150,000 to 400,000 BTUs, making them ideal for big workshops, warehouses, or pole barns that need serious heat.
- With 83% thermal efficiency, the PDP series helps control fuel costs throughout the heating season.
- The PDP series is engineered for easy service, featuring wing screws for tool-free access and a level hanging mechanism for easy adjustments even after installation.
- Engineered to use the smallest possible vent pipe diameter, the PDP simplifies installation.
The pilot ignition even includes continuous retry, meaning it will keep trying to start if it doesn’t light on the first try. You won’t have to fight with it. Designed, engineered, and assembled in the USA, the PDP delivers dependable, cost-effective heat for commercial, especially agricultural spaces.
Modine PTP
The Modine PTP brings commercial heating power in a low-profile package. These units deliver 82% thermal efficiency in sizes from 150,000 to 400,000 BTUs, perfect for warehouses, workshops, and studios where you need serious heat but want to keep your ceiling space clear.
- A permanently-lubricated motor eliminates maintenance, and the standard power exhaust accommodates a small-diameter vent pipe for flexible setup.
- Low-profile mounting preserves ceiling space, similar to the Hot Dawg series.
- All controls are enclosed within the cabinet for protection against dust and moisture.
You can easily install and repair these unit heaters because of their easy-access terminals and knockouts for quick connections. The Modine PTP delivers professional-grade performance and is designed, engineered, and assembled in the USA, like all other Modine products.
Sterling XF
The Sterling XF series brings commercial-grade heating with a smart twist – it's built to handle both standard and separated combustion right out of the box.
- A curved, non-welded serpentine heat exchanger reduces thermal stress and maximizes heat transfer, ensuring reliable performance in demanding commercial environments.
- You can rest easy because it comes with a 10-year warranty on the exchanger, flue collector, and burners.
- Direct spark ignition and power venting reduce fuel waste when the unit is on standby, improving seasonal efficiency.
What makes the Sterling XF especially practical is its versatility. When you need separated combustion for dusty or humid conditions, just connect piping to the rear inlet collars – no unit modifications required. These tubular propeller units range from 100,000 to 400,000 BTUs and are ETL-certified, making them perfect for light commercial spaces.
Most Efficient Gas-Fired Unit Heaters
Modine PTC
The Modine Effinity PTC is one of North America's most efficient gas-fired unit heaters, operating at up to 97% thermal efficiency. These unit heaters range from 55,000 to 310,000 BTUs.
- Energy Saver Controls circulate warm ceiling air when your space reaches a certain temperature, rather than constantly firing the burner.
- It draws combustion air from outside, keeping fumes away from your space.
- You can vent with affordable PVC pipe instead of expensive metal, and just one unit can lower CO2 output by thousands of pounds annually.
What sets the Modine Effinity PTC apart is how it captures heat that other units waste. The dual heat exchanger technology squeezes every bit of warmth it can from the fuel. Because of its efficiency and ability to keep fumes away, it's especially popular for greenhouses, workshops, and commercial spaces where fuel savings and clean air really matter.
Reznor UEZ
The Reznor UEZ is a unit that looks as good as it performs. Available in seven sizes from 55,000 to 310,000 BTUs, these heaters achieve top-tier efficiency while using less electricity than you'd expect.
- Its 91-93% thermal efficiency saves serious money on fuel costs.
- The dual heat exchanger design captures more heat from every bit of fuel, and the sleek two-tone finish with rounded edges looks professional in any setting.
- The TCore3 stainless steel heat exchanger is backed by a 10-year industry-leading warranty.
The Reznor UEZ, like other energy-efficient unit heaters, draws combustion air from outside, meaning that dust and chemicals in your space won't affect its performance or durability. It's built for commercial warehouses, professional garages, and industrial spaces where efficiency matters and downtime can't be afforded.
Best Electric Unit Heaters to Buy in 2026
The best electric unit heaters deliver clean, quiet heating for spaces where venting is impractical, or gas service isn't available.
Best Electric Unit Heaters for Residential Garages
Modine AMP Dawg
The Modine AMP Dawg brings electric heating that performs like a gas unit without the venting hassle. Available in 5.7kW and 9.0kW sizes, it keeps your garage, workshop, or basement warm year-round with the same heat throw you'd expect from the Hot Dawg gas series.
- The unobtrusive design mounts close to the ceiling to save overhead space.
- It runs quietly with no vibration at any speed.
- The exterior casing stays cool to the touch, even while it's heating.
The smaller 5.7kW model works great for residential garages and basements, while the 9.0kW unit offers two-stage heating for larger workshops. It heats up your space quickly with a 20-foot heat throw and includes built-in thermostat controls so you can dial in your comfort level. It provides you with reliable electric heat without the noise you might expect from a heater this powerful.
Reznor EGW
The Reznor EGW is a compact electric heater for garages, workshops, and spaces that need basic heat or freeze protection. Available in 2kW, 3kW, and 5kW sizes, it is lightweight and includes mounting brackets for easy ceiling or wall installation.
- It features a space-saving design that fits where larger heaters cannot.
- The heating components are made from stainless steel for long-lasting performance.
- The adjustable louvers let you direct airflow where you need it.
It has a steel cabinet with a corrosion-resistant coating that keeps it looking good and working for a long time. The Reznor EGW is the best unit heater for when you need simple, affordable heating in a smaller space.
Best Electric Unit Heaters for Commercial & Industrial Applications
Reznor EUH
The Reznor EUH comes in eight models ranging from 3kW to 30kW, giving you plenty of options that work with common voltages and multi-stage controls to help slash your operating costs.
- Powered by renewable electricity, these units are 100% efficient with zero emissions.
- The stainless-steel heating elements are fully enclosed and protected, so they'll keep running for years.
- Just like the EGW, adjustable louvers let you aim heat exactly where you need it, and built-in safety features include airflow protection and an automatic reset if things get too hot.
It's an excellent choice for warehouses, workshops, retail spaces, schools, and anywhere gas heating isn't practical - or if you're just looking to reduce your carbon footprint.
Reznor EUHC
The Reznor EUHC packs serious heating power into a compact, low-clearance design that's perfect for tight spaces. Available in eight sizes from 3kW to 20kW, these units deliver comfort with multi-voltage compatibility.
- It is designed to fit into tight spaces like warehouse hallways, taking up minimal floor or shelf space.
- It features a multi-position hanger that enables vertical and horizontal mounting, or every 15 degrees in between.
- Like the EUH, it includes adjustable louvers and built-in safety features with automatic reset.
It includes a fan-only mode that makes this unit heater great for year-round comfort - you can use it for air circulation in warmer months, not just heating. It's a smart pick for facilities working toward decarbonization goals, or anywhere you need efficient electric heating without taking up valuable space.
Modine HER
The Modine HER is designed for buildings with low ceilings and few obstructions where you need reliable perimeter heating. You can place them around a building's outer walls to create a blanket of warm air right where heat loss is greatest.
- Horizontal deflector blades adjust to lengthen or shorten heat throw and direct air up or down.
- The hinged bottom panel gives you easy access to controls without having to take anything apart.
- Like other Modine electric heaters, the motors are enclosed and protected against thermal overload, and the unit includes safety features to prevent overheating.
What makes the Modine HER great is how easy it is to service.  The fan and motor assemblies can be removed without lowering the unit, and the terminal boxes provide easy access to the heating elements and power connections. It's a solid choice when you need perimeter heating in spaces with height restrictions.
Most Powerful Electric Unit Heaters
Reznor EGHB
The Reznor EGHB is engineered for tough industrial environments needing high airflow and durability. Designed for mines, commercial halls, stairwells, factories, warehouses, and high-bay installations, this heavy-duty heater stands up to demanding conditions. It has kW output of 40-60kW.
- Heavy 18- and 20-gauge steel construction with corrosion-resistant coating keeps it running in harsh environments.
- Like other Reznor electric heaters, it features stainless steel tubular heating elements built to last.
- It includes safety features such as a thermally protected motor and high-limit temperature control with automatic reset.
It's the go-to choice for industrial applications with challenging conditions that require dependable heat and high airflow.
Modine PTE
The Modine Power-Throw PTE is designed for tough heating challenges like frequently opened loading dock doors and hard-to-heat warehouse areas. These high-velocity units deliver serious heat throw that standard heaters just can't match, and one Modine PTE can often replace three smaller units. It has kW output of 30-50kW.
- Extended heat throw delivers warm air to the floor, even at high mounting heights.
- Horizontal deflector blades provide precise airflow control.
- Motors and fans are completely enclosed, and it has an automatic reset overheat control that cuts power to the heating elements if needed, then resets itself once things cool down.
The Modine PTE also runs super quietly despite its power. It’s available in three sizes from 15kW to 50kW, with single- or two-stage controls, and is a smart choice when you need powerful heat delivery in large or drafty spaces.
Modine VE
The Modine VE Series is designed for spaces where you need to push heat straight down from overhead rather than throw it horizontally. Unlike the PTE, which projects heat over long distances, the VE blows warmth directly down to floor level. It has kW output of 5-50kW, depending on the model.
- Deflector blades adjust heat throw length and direct airflow as needed.
- Removable fan and motor assemblies simplify service without lowering the entire unit.
- Motors are enclosed and protected from thermal overload.
A vertical design ensures uniform heat distribution from above. Like the Modine PTE, the Modine VE features terminal boxes that offer easy component access and an automatic reset overheat control for safer operation. The VE is great for warehouses and industrial spaces with high ceilings.
Best Hydronic Unit Heaters to Buy in 2026
Hydronic unit heaters are a smart choice if you already have a boiler system.
Best Hydronic Unit Heaters for Residential Garages
Modine HHD
The Modine Hot Dawg H20 HHD is the only residential hydronic unit heater in North America with a compact, space-saving design. Available in two sizes, it's perfect for garages, workshops, and other residential spaces where you already have a hot water or boiler system and want the same quality as the gas-fired Hot Dawg.
- The unit works with water pressures up to 150 PSI and temperatures up to 200°F, making it compatible with most residential and commercial hot water systems.
- The twin blowers are fully enclosed, so all moving parts stay protected, and the mounting brackets feature vibration isolators that keep everything quiet.
- Piping and electrical connections can be easily reversed to fit your space.
It's the best choice when you want Hot Dawg reliability but need to connect to an existing boiler or hot water system rather than run gas lines.
Best Hydronic Unit Heaters for Commercial & Industrial Use
Reznor UWS
The Reznor UWS is a hydronic unit heater available in nine sizes from 10,000 to 191,000 BTUh. These units can be paired with high-efficiency boilers to reduce your environmental footprint.
- The only hydronic heater with water connections on the back, keeping the front clean and professional looking.
- Copper tube heat exchanger delivers better performance and longevity than steel alternatives.
- Variable-speed control lets you adjust airflow from low to high with a simple knob.
The UWS offers flexible directional control, so you can tailor heat delivery to your space. The motor is totally enclosed and protected against water spray, and anti-vibration rubber mountings keep the operation quiet. It's a smart choice for warehouses, loading docks, retail spaces, and sports facilities where you need sustainable heating that ties into your existing hot water system.
Modine HC
The Modine HC Series is one of the most popular hydronic unit heater choices for commercial and industrial applications where you need steam or hot water heating.
- These lightweight units are designed for long heat throw and uniform heat delivery, with flexible piping options to fit your space.
- The unit rotates 360° without requiring any changes to the piping.
- Its serpentine copper tube coil design can handle high steam pressures without any thermal shock.
Larger models hang from the ceiling using threaded rods or pipe hangers, while the smallest units are so lightweight they're supported by the water pipes themselves. It's a solid choice for commercial and industrial spaces that need reliable steam or hot water heating, with quick installation and minimal footprint.
Modine PT
The Modine Power-Throw PT unit heater addresses the same tough heating challenges as the electric PTE, but runs on steam or hot water.
- It is available in six sizes, ranging from 279,000 to 385,000 BTU, for large-scale heating over a wide area.
- Horizontal deflector blades adjust airflow up or down for precise control.
- PT models use copper tubes, while PTN models use copper/nickel tubes for extreme conditions (up to 250 PSI steam or 400°F water).
The standard PT models work great for typical commercial applications, while the PTN version is built for heavy-duty industrial settings with high-pressure steam or high-temperature water. Both of these high-velocity units are commonly used in frequently opened loading dock doors and hard-to-heat warehouse areas.
Modine V
The Modine V vertical hydronic unit heater delivers heat straight down from above, just like the VE electric model, but powered by steam or hot water instead. Perfect for high-ceiling spaces or areas where obstructions prevent good horizontal airflow, these units can be suspended up to 54 feet above the floor.
- It comes in 15 sizes from 42,000 to 385,000 BTU for a wide range of applications.
- Copper tube construction handles standard steam and hot water heating.
- Different deflector options let you customize how heat spreads through your space - whether you need a wide pattern or focused delivery.
Like the PT/PTN series, the V model uses copper tubes for typical commercial applications, while the VN version (sold separately) features copper/nickel tubes for extreme conditions. It's a great choice for warehouses, manufacturing facilities, and other high-ceiling spaces where heating from above makes more sense than heating from below.
Shop the Best Unit Heaters at HVACDirect.com
Whether you need a gas unit heater for a warehouse, an electric unit heater for your garage, or a hot water unit heater for your facility, these top-rated models from Modine, Reznor, and Sterling represent the best choices for 2026.
Ready to upgrade? Shop at HVACDirect.com for great prices, expert help, and fast shipping on the best heating solutions. The right heater will keep you warm and comfortable all winter.
