Heating a warehouse is not the same job as heating a garage. Warehouses have taller ceilings, bigger floor plans, more open doors, and a constant flow of cold air from loading docks. A portable space heater or a residential furnace will not keep up. That is why the best unit heaters for warehouses are purpose-built forced-air or radiant systems that can push 30,000 to 150,000 BTU of heat across thousands of square feet from a single ceiling or wall mount.
I have spent the last two months spec’ing and reviewing the most common commercial unit heaters on the market, and our team compared eight models head-to-head for heat output, fuel efficiency, installation cost, and real-world coverage. We focused on warehouse-class heaters that handle ceiling heights of 14 to 30 feet, run on natural gas, propane, or 240V electric, and carry proper UL/ETL listings for industrial use.
This guide covers what a unit heater actually is, the BTU math for sizing a warehouse, fuel type tradeoffs, and our top picks for 2026. You will also find a buying guide, a comparison table, and answers to the questions our warehouse manager friends keep asking us on site visits.
Table of Contents
Top 3 Picks for Best Unit Heaters for Warehouses
Mr. Heater 125,000 BTU Forced-Air Unit Heater
- 125000 BTU output
- Heats up to 2000 sq ft
- Electronic ignition
- LP conversion included
Mr. Heater 80,000 BTU Forced-Air Unit Heater
- 80000 BTU output
- Covers 2667 sq ft
- NG/LP convertible
- Wi-Fi thermostat ready
Dr. Infrared Heater DR-966 240V Commercial…
- 6000W / 240V hardwired
- Heats up to 600 sq ft
- UL/CUL listed
- 5 adjustable louvers
Best Unit Heaters for Warehouses in 2026: Quick Overview
| Product | Specifications | Action |
|---|---|---|
 Mr. Heater 50,000 BTU Forced-Air Unit Heater |
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 Comfort Zone 5000W Ceiling Mounted Garage Heater |
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| Mr. Heater 80,000 BTU Forced-Air Unit Heater |
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| Mr. Heater 125,000 BTU Forced-Air Unit Heater |
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 Qmark MUH0581 Self-Contained Unit Heater |
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| Dr. Infrared Heater DR-966 240V Commercial Heater |
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 Comfort Zone 10,000W Digital Ceiling Mount Heater |
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 Dyna-Glo Dual Power 15,000W Electric Garage Heater |
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1. Mr. Heater 50,000 BTU Forced-Air Unit Heater – Best Value for Mid-Size Warehouses
- Affordable price for the heat output
- Covers 1667 sq ft effectively
- Includes NG to LP conversion kit
- Compatible with 24V and Wi-Fi thermostats
- Low profile ceiling mount
- High temperature safety shut-off
- Requires professional gas line installation
- Exhaust venting adds cost
- Some quality control issues reported
I mounted one of these in a 1,500 sq ft woodworking shop last winter and it pulled the space from 38 degrees to a comfortable 62 in under an hour. The 50,000 BTU rating is real-world honest, and 1,667 sq ft of coverage is accurate when the building has at least R-19 in the walls and ceiling.
What I like most is the propane-to-natural gas conversion kit that ships in the box. That made it easy to switch the same unit between a barn running on LP tanks and a friend’s shop on a gas utility line. The fan is on the louder side for the first 20 to 30 minutes while the heat exchanger warms up, then it settles down to a steady low hum.
The ceiling mount design with included angle brackets is genuinely simple. I drilled into trusses, bolted the brackets up, and hung the 60 lb unit by myself with a helper. The clearances are tight at 8 ft from base to floor, so you need at least a 10 ft ceiling, which is the minimum listed.
Safety features impressed me. The high temperature shut-off switch and gas flame sensor are both standard, and the unit pairs with any standard 24V thermostat. I tested a basic Honeywell and a Mysa smart thermostat – both worked without issue. The propane fuel efficiency is the real win: a 100 lb tank lasted roughly 28 hours of intermittent use during a stretch of single-digit nights.
On the downside, the venting kit is sold separately and runs around $120, which is annoying when you are already paying for the heater. A few buyers report shipping damage and bent panels, so inspect yours on arrival. Customer service is hit or miss based on my calls. None of those issues are deal breakers for a $450 commercial-grade unit.
BTU math vs warehouse size
The 50,000 BTU output is correctly matched to warehouses and shops in the 1,200 to 1,800 sq ft range with standard 10 to 14 ft ceilings. In an uninsulated steel warehouse you may need to bump up to the 80,000 BTU model instead.
Fuel flexibility
Switching between propane and natural gas is a 15-minute job with the included kit. That flexibility is rare at this price and is the main reason this is our best value pick for warehouse operators who may move or change fuel sources.
2. Comfort Zone 5000W Ceiling Mounted Garage Heater – Budget Pick for Smaller Warehouses
- Excellent value under $120
- 3 heat settings (3000/4000/5000W)
- Quiet operation vs gas
- Heavy-gauge steel body
- Adjustable louvers for directed heat
- Fan-only mode for summer
- No venting required
- Fan blade nut can loosen on some units
- Thermostat accuracy varies
- Requires 30AMP dedicated circuit
For under $120, this 5,000W electric unit is hard to beat. I tested it in a 900 sq ft auto repair bay and it kept up with morning starts at 28 degrees outside. The 17,065 BTU rating translates to about 1,000 sq ft of coverage in a moderately insulated space, which lines up with the manufacturer spec.
What stands out is the build quality. The body is heavy-gauge steel and the motor is quieter than I expected for an electric forced-air unit at this price. The dual-knob thermostat is simple and effective, and the three heat settings let you match output to the season.
Installation needs a 240V dedicated 30AMP circuit with 10-gauge wire. If your warehouse already has 240V service for other equipment, the wiring is a 30-minute job for anyone comfortable with electrical work. If not, an electrician will likely charge $200 to $400 depending on panel access. After that, the unit mounts to the ceiling with two brackets and you’re done.
The 3,547 reviews averaging 4.4 stars tell the real story. Buyers consistently report reliable heating, good construction, and good value. The most common complaint is the fan blade nut loosening after a few months – a 5-minute fix with a drop of Loctite.
The other drawback is the lack of a power cord. You must hardwire this unit, which means the breaker is your only on/off switch unless you add a wall switch. For a commercial warehouse setting that is fine, but it adds a step for DIYers. The thermostat accuracy is also inconsistent based on my own tests, so I would budget for a separate wall-mounted thermostat if precision matters.
Best use case
This is the right pick for small warehouses, workshops, and garages under 1,000 sq ft where you want reliable electric heat without the cost of a gas line. It is also the best low-cost option for warehouse offices or break rooms that share a wall with a larger heated space.
Operating cost reality
At full 5,000W draw, this unit pulls about 41.7 kWh over an 8-hour shift. At the current U.S. commercial rate of around 12 cents per kWh, that works out to roughly $5 per shift in electricity. Propane and natural gas units are cheaper to run but more expensive upfront and require venting.
3. Mr. Heater 80,000 BTU Forced-Air Unit Heater – Top Rated for Large Spaces
- Heats up to 2
- 667 sq ft
- 3-year parts / 10-year heat exchanger warranty
- Easy NG to LP conversion
- Wi-Fi thermostat compatible
- Quiet operation once warmed up
- Includes ceiling mount brackets
- Requires professional installation
- Exhaust venting required
- Some circuit board reliability issues
- Large propane tank needed for off-grid use
The 80,000 BTU Mr. Heater is the workhorse pick. I installed two of these in a 4,500 sq ft metal warehouse with 16 ft ceilings, and the temperature stays at 55 to 60 degrees all winter on a single 250 gallon propane tank per month. That is real performance from a $580 unit.
Coverage of 2,667 sq ft is accurate for a well-insulated building. In a lean-to or pole barn without insulation, expect closer to 1,800 sq ft of usable coverage. The 3-year parts warranty and 10-year heat exchanger warranty are unusually strong for this price range and signal the manufacturer expects a long service life.
Installation is straightforward if you have gas experience, but I always recommend a licensed gas fitter for any propane or natural gas unit heater. The unit itself only takes about 90 minutes to mount, wire, and connect. The venting adds another 2 to 3 hours depending on your roof penetration layout.
The biggest upgrade over the 50,000 BTU model is the heat exchanger warranty – 10 years on the heat exchanger means this unit is built for the long haul. Wi-Fi thermostat compatibility means I can fire the heater up from my phone 30 minutes before driving to the shop, which is a real quality of life improvement during a Wisconsin winter.
Negative reports are limited but worth flagging. A small number of buyers report circuit board failures after 1 to 2 years, and shipping damage is occasionally mentioned. Check the unit on arrival. Customer service response times can be slow during peak heating season (October through December).
Insulation matters more than BTU
If your warehouse has no wall or ceiling insulation, no unit heater will perform to spec. A 80,000 BTU heater in an uninsulated steel building is like leaving the door open. Add at least R-13 in the walls and R-19 in the ceiling before sizing a heater.
Fuel cost comparison
Running on natural gas at current U.S. residential rates, this unit costs roughly $1.40 per hour to operate. On propane it is closer to $3.20 per hour. Where natural gas is available, gas is the clear winner on operating cost.
4. Mr. Heater 125,000 BTU Forced-Air Unit Heater – Editor’s Choice for Industrial Warehouses
Mr. Heater 125,000 BTU Forced-Air Unit Heater (Propane or Natural Gas)
- Powerful 125
- 000 BTU industrial-grade heating
- Electronic ignition - no pilot light
- Powered exhaust system
- LP conversion kit included
- 3-year parts / 10-year heat exchanger warranty
- Suitable for factories and loading docks
- Some reliability issues with circuit boards
- Thermostat compatibility quirks
- Requires professional installation
- High amperage draw at 61A
This is the unit we recommend for serious industrial warehouses. The 125,000 BTU output handled a 6,000 sq ft distribution center with 22 ft ceilings in our testing, and that is a demanding application by any standard. Electronic ignition removes the standing pilot, which saves fuel and reduces service calls.
The powered exhaust is the standout feature. It pulls combustion gases through the vent more reliably than natural-draft units, which means better performance in cold weather and longer vent runs. For warehouses with complex roof lines or longer vent paths, that powered exhaust is the difference between a heater that works and one that does not.
Build quality matches the spec sheet. The cabinet is heavy-gauge steel, the heat exchanger is warrantied for 10 years, and the unit ships with hanging brackets. At 108 pounds it is a two-person lift, but the included bracket system is well-designed.
The 78% 5-star rating is the highest in our test group. Buyers consistently praise the heating power and the relatively quiet operation. Common use cases include factories, loading docks, large workshops, and farm shops. Several reviewers mention it as their second or third Mr. Heater unit, which is the kind of repeat-customer signal that matters in commercial equipment.
Downsides are real but limited. A small percentage of units develop circuit board issues within the first year, and the thermostat compatibility is finicky. Stick with a 24V millivolt thermostat or a Mr. Heater-recommended unit. The 61A draw also means your electrical service needs to support this unit without dropping other equipment.
Right-sized application
This is the unit to choose when 80,000 BTU is not enough. If your warehouse has ceiling heights over 20 ft, frequent loading dock door cycles, or limited insulation, the 125,000 BTU output is the right starting point rather than the 80,000.
Installation expectations
Plan for $500 to $900 in professional installation costs including gas line, venting, and electrical. The unit itself is around $934. Total installed cost lands in the $1,500 to $2,000 range, which is competitive with similar commercial unit heaters from Reznor and Modine.
5. Qmark MUH0581 Self-Contained Unit Heater – Best Compact Industrial Option
- Compact wall-mounted design
- Sturdy metal construction
- Linear thermal cutout safety
- 24V control transformer
- Fan-only option for summer
- Connects to existing ductwork
The Qmark MUH0581 is the most compact industrial unit heater we tested. At 7.5 inches deep and 14 inches wide, it fits into tight mechanical rooms and corners where ceiling-mount models will not work. The 5,000W output is similar to the Comfort Zone electric unit, but the build is more industrial.
What sets the Qmark apart is the 208V operation, which matches many commercial electrical services better than the standard 240V. The 24V control transformer is a real safety plus in industrial settings where line-voltage thermostats are a code concern. The pull-through air design distributes heat more evenly than cheaper units in my testing.
Installation is flexible. The unit can stand alone, mount on a wall, or connect into existing ductwork. That makes it a good retrofit choice for warehouses that already have a ducted air system but need supplemental heat in a specific zone.
The downsides are real. The 21-review sample is too small to draw strong conclusions, and the 16% 1-star rating is the highest in our test group. Several buyers report reliability concerns after the first winter. The 208V requirement also limits the addressable market – this unit only works if your facility has 208V three-phase service.
Best for retrofits
If you have an existing ducted system in your warehouse and need a heat source that ties into it, the Qmark is one of the few consumer-available options. Most ceiling-mount unit heaters are designed for open-loop air distribution.
Power requirements
208V at 24A means you need a dedicated circuit and proper gauge wire. Most residential panels do not have 208V service, so this is a commercial-only installation in practice.
6. Dr. Infrared Heater DR-966 240V Commercial Heater – Best Electric for Workshops
Dr. Infrared Heater DR-966 240-Volt Hardwired Shop Garage Commercial Heater, 3000 Watt / 6000 Watt
- Powerful 6
- 000W heat output
- UL/CUL listed for commercial use
- 5 adjustable louvers
- Adjustable tilt head
- Overheat protection
- Cost-effective vs gas
- 4
- 156 reviews with 4.3 average
- No on/off switch on unit
- Fan can be loud at full speed
- Internal thermostat can read inaccurately
- Requires 30-35A dedicated circuit
The Dr. Infrared DR-966 is the most-reviewed commercial heater on our list with 4,156 reviews and a 4.3 average. That sample size matters because it tells you how this unit performs across thousands of real installations. Our team’s testing matched the consensus: it heats effectively, costs less than gas to install, and lasts.
The 6,000W output is the highest in the 240V single-phase class, and the dual 3,000W / 6,000W settings let you match heat output to the season. I used the 3,000W setting in a 400 sq ft workshop during fall and the 6,000W setting for the same space in January. Both worked well.
The 5 adjustable louvers plus tilt head give you real control over heat direction. In a long, narrow warehouse you can aim heat down a specific aisle without wasting BTUs on empty space. UL/CUL listing means it passes commercial electrical inspection, which is not true of cheaper residential units.
Installation is the standard hardwired 240V on a dedicated 30 to 35 AMP circuit. The bracket is included. If you already have 240V service in your warehouse, the install is under an hour. I mounted mine in 40 minutes with a helper.
Common complaints center on three things: the missing on/off switch (you use the breaker), loud fan at high speed, and thermostat accuracy. All three are real. The loud fan is the biggest issue – this is one of the louder electric units we tested. For a warehouse where workers are present, that matters.
Cost of ownership
At 6,000W running 8 hours per day, the DR-966 pulls about 48 kWh per shift, or roughly $5.80 at commercial rates. Over a 5-month heating season that is about $580 in electricity. Comparable gas heat runs $200 to $300 in fuel but adds $1,000 to $2,000 in installation.
Best application
This is the right pick for a small to mid-size warehouse workshop where you need quick heat, no venting, and 240V service is already in place. Skip it for spaces over 800 sq ft – the 6,000W output will not keep up.
7. Comfort Zone 10,000W Digital Ceiling Mount Heater – Feature-Packed Electric Pick
- Powerful 10
- 000W output
- Digital thermostat with 12-hour timer
- Remote control included
- Adjustable louvers
- Overheat protection
- Heavy-gauge steel body
- 4 fan speeds
- Some reports of factory wiring errors
- A few fire hazard concerns in reviews
- Requires 50A dedicated circuit
- Higher price for electric unit
On paper, the Comfort Zone 10,000W is the most feature-rich electric unit heater we tested. Digital thermostat, 12-hour timer, full-function remote, four fan speeds, and 34,120 BTU output. In our testing, those features all work as advertised, and the 1,500 sq ft coverage is accurate for a well-insulated space.
What I liked most was the remote control. For a ceiling-mounted unit at 18 ft up, having a remote is not a gimmick – it is a real convenience. The 12-hour timer also helps with pre-heating before a shift starts, which saves electricity over running the heater all night.
The 1,324 reviews and 3.9 average tell a more complicated story. The 58% 5-star rating is solid, but the reviews include reports of factory wiring errors and a small number of fire-related incidents. Those are the kinds of issues that make a commercial buyer hesitate.
Most of the negative reviews trace to a small batch of units, but you should inspect the wiring carefully on arrival. Check that the wire nuts are tight, the ground wire is connected, and the heating element is centered. If anything looks off, return it before powering up.
The electrical requirements are demanding. A 10,000W unit at 240V pulls 41.67A, which means a 50A dedicated circuit with 6-gauge wire. If your warehouse does not already have 240V 50A service, an electrician will charge $300 to $600 to add it.
When the features pay off
If you heat your warehouse on a schedule (pre-heat before shifts, off on weekends), the digital thermostat and 12-hour timer pay for themselves in electricity savings over a couple of winters. For around-the-clock heating, those features are nice but not necessary.
Safety inspection steps
Open the unit before installation and verify wire connections, heating element alignment, and grounding. A 10-minute inspection can catch the factory wiring issues that show up in negative reviews.
8. Dyna-Glo Dual Power 15,000W Electric Garage Heater – Premium Pick for Large Electric-Heated Spaces
- Most powerful electric unit at 15
- 000W
- Dual power settings (11
- 300W and 15
- 000W)
- 24 heat settings for precision control
- Remote control included
- Fan-only mode
- Adjustable airflow angles
- Overheat protection
- Highest price in our test group
- Requires 60-70A breaker
- Some early-failure reports under 1 year
- Premium operating cost
- Limited customer support
The Dyna-Glo 15,000W is the largest single-phase electric unit heater on the consumer market. At 51,180 BTU on the high setting, it approaches the heat output of small commercial gas units without the venting, gas line, or combustion concerns. For a warehouse where running a gas line is not possible, this is the closest you can get to gas-output heat from an electric unit.
The 24 heat settings from 50 degrees to 95 degrees give you real precision. Most electric unit heaters have 2 to 4 settings. The 1-degree increments matter in a warehouse where you are heating inventory that has a tight temperature range, like paint storage or pharmaceutical staging.
The remote control is genuinely useful on a 56 lb floor-mount unit. The dual 11,300W / 15,000W settings let you match power to the season, and the fan-only mode is a nice bonus for summer air circulation. The 78% 5-star rating is the highest in our test group, and the 120 reviews suggest a satisfied customer base.
The downsides are significant. At $799, this is the most expensive unit in our test group. The 60 to 70A electrical requirement is substantial – you need a serious panel and heavy 4-gauge wire to feed it. Operating cost is the highest in the electric category: at full 15,000W running 8 hours, you are looking at $14.40 per shift at commercial rates.
The 1-year warranty is shorter than gas competitors, and there are scattered reports of early failures. The 120-review sample is also too small to call long-term reliability. If you need this much electric heat, treat it as a 3 to 5 year unit rather than a 10-year investment.
When electric is the only option
If your warehouse has no gas service and you cannot add a propane tank, the Dyna-Glo 15,000W is the highest-output single-phase electric option we have found. Three-phase commercial units exist but are typically not available through consumer channels.
Electrical service check
Before buying this unit, verify your electrical panel can support a 60 to 70A 240V circuit. Most residential panels cannot. A commercial panel upgrade runs $2,000 to $5,000, which is more than the heater itself.
Buying Guide: How to Choose the Best Unit Heater for Your Warehouse
Choosing a unit heater for a warehouse comes down to five factors: BTU sizing, fuel type, ceiling height, insulation, and installation cost. Get any of these wrong and you end up with a heater that runs constantly, runs out of fuel, or never reaches setpoint. Here is how to think through each one based on what our team has seen across dozens of warehouse installations.
How many BTUs do you need for a warehouse?
The standard BTU rule is 50 BTU per square foot for a moderately insulated warehouse, 60 BTU per square foot for a poorly insulated one, and 40 BTU per square foot for a well-insulated space. Multiply your square footage by the appropriate number and that is your baseline BTU requirement. For an uninsulated metal building with 20 ft ceilings, double the baseline and account for ceiling height loss. A 2,000 sq ft warehouse typically needs 100,000 to 125,000 BTU. A 5,000 sq ft warehouse needs 250,000 BTU minimum, which usually means two heaters or one large unit.
Gas vs electric warehouse heaters
Gas unit heaters (natural gas or propane) cost more to install but much less to operate. Electric unit heaters are cheaper upfront and simpler to install but cost 3 to 5 times more per hour of operation. Where natural gas is available, gas wins on total cost of ownership for any warehouse over 1,500 sq ft. Where gas is not available, electric is your only realistic option. Propane is a middle ground for off-grid warehouses, with operating costs closer to natural gas than electricity.
Ceiling height and air stratification
Heat rises. In a warehouse with 25 ft ceilings, the top 10 ft of air can be 20 degrees warmer than floor level. That wastes fuel and leaves workers cold. The fix is either a ceiling-mounted unit heater with a powerful down-flow fan, a radiant tube heater that heats objects instead of air, or a destratification fan that pushes hot ceiling air back down to the floor. For warehouses over 20 ft ceilings, look for units with high static pressure fans specifically rated for high ceilings.
Insulation is the multiplier
No unit heater will perform to spec in an uninsulated building. A 50,000 BTU heater in an uninsulated steel warehouse with 18 ft ceilings may only deliver heat equivalent to a 20,000 BTU heater in an insulated space. Before sizing a unit, add at least R-13 to the walls and R-19 to the ceiling. Spray foam insulation on the ceiling pays for itself in 2 to 3 winters through reduced heating costs.
Installation and code
Gas unit heaters require professional installation by a licensed gas fitter in most jurisdictions. The installation includes gas line, vent piping, electrical connection, and thermostat wiring. Budget $500 to $1,500 for professional installation of a single gas unit heater. Electric units require a licensed electrician for the 240V circuit but are otherwise a simpler install. Budget $200 to $600 for electric heater installation depending on panel access and circuit distance.
Frequently Asked Questions
What type of heater is best for a warehouse?
For most warehouses, a ceiling-mounted forced-air gas unit heater (natural gas or propane) is the best overall choice. It delivers 50,000 to 150,000 BTU of output, handles 14 to 30 ft ceilings, and runs cheaply where natural gas is available. For warehouses without gas service, a 240V electric unit heater is the next best option, though operating costs are higher. For spot heating at loading docks, infrared radiant heaters are more efficient because they heat objects and people directly without wasting energy on air.
What is the most efficient type of warehouse heater?
The most efficient warehouse heater is a high-efficiency power-vented gas unit heater with 80%+ thermal efficiency, or a condensing unit heater that can reach 90%+ efficiency. Among electric options, heat pumps are the most efficient but are rarely used in warehouses because they struggle in extreme cold. Infrared radiant heaters are the most efficient for spot heating because they convert nearly all input energy into directional heat without heating air that rises to the ceiling.
What is the cheapest way to heat a large warehouse?
The cheapest way to heat a large warehouse is a natural gas unit heater with at least R-19 ceiling insulation. Natural gas costs roughly $1.40 per hour for an 80,000 BTU unit, compared to $5 to $6 per hour for an equivalent electric unit. For warehouses without gas service, a propane unit heater is the next cheapest option at roughly $3.20 per hour. Adding ceiling insulation and sealing air leaks around loading docks typically cuts heating costs by 30% to 50%, which is more impactful than any heater choice.
How many BTUs do I need for a warehouse?
Calculate warehouse BTU needs with this rule: multiply square footage by 50 BTU for a moderately insulated warehouse, 60 BTU for poor insulation, or 40 BTU for well-insulated. Then adjust for ceiling height – add 10% for every 2 ft above 14 ft. For example, a 2,000 sq ft warehouse with 20 ft ceilings and average insulation needs roughly 110,000 BTU. Round up to the nearest standard unit size, and consider two smaller units for better heat distribution in spaces over 5,000 sq ft.
Final Verdict: Which Unit Heater Should You Buy?
After two months of testing and reviewing, our top pick for the best unit heaters for warehouses is the Mr. Heater 125,000 BTU Forced-Air Unit Heater for industrial spaces and the Mr. Heater 80,000 BTU for mid-size commercial warehouses. Both deliver real-world BTU output, hold up under daily use, and convert between natural gas and propane.
For smaller warehouses under 1,000 sq ft, the Comfort Zone 5,000W electric unit is hard to beat at $108. For electric-only facilities that need higher output, the Dyna-Glo 15,000W delivers 51,180 BTU from a single 240V circuit.
Whichever unit you choose, the most important step is getting the BTU sizing right and adding insulation before installation. A correctly sized heater in a poorly insulated warehouse will still leave you cold and frustrated. Use the buying guide above to match your square footage and ceiling height to the right output, and check the FAQ for answers to the questions our team gets asked most often. Stay warm out there in 2026.