240-Volt Electric Garage Heaters: Six Hardwired Options for Cold Workshops

A two-car garage in January can sit below freezing for weeks, and a plug-in heater from the bedroom will barely dent it. That is why serious workshop owners move to 220 volt garage heaters, which draw from a dedicated 240 volt circuit and deliver far more heat than a standard household outlet allows. The best electric garage heater at this voltage is a hardwired or dedicated-outlet unit sized to your square footage, ideally ceiling- or wall-mounted so it stays off the floor and away from tools, paint cans, and parked vehicles.

Because installation involves a dedicated breaker, confirm local code and consider hiring an electrician. The six picks below are real product lines, described only by what their names tell you, so verify wattage, voltage, and mounting details on the maker’s page, as of 2026. For a smaller plug-in alternative that works in a spare room rather than a shop, see our guide to electric room heaters, and use the notes below when the space is large and the winters are long.

Quick Picks

Nearly everything in this table is a fixed-mount heater, which is the format that makes sense once you cross the limits of a wall outlet. The practical question is not which brand sounds best but whether you have the breaker capacity, the wall or ceiling space, and the right clearance from stored items. Answer those three first and the shortlist shrinks quickly.

How to Choose

Calculate wattage for your space

A reliable rule of thumb for a well-insulated garage is about 10 watts per square foot. A 400 square foot two-car garage needs roughly 4,000 watts. Uninsulated or drafty garages may need 12 to 15 watts per square foot, and a concrete slab in a cold climate pulls even more. Under-sizing gives you a heater that runs forever without reaching a comfortable temperature, so measure the floor area and note the ceiling height before shopping.

Confirm voltage and circuit requirements

A 240 volt heater needs a dedicated double-pole breaker. A 4,000 watt heater draws roughly 17 amps and calls for a 20 or 25 amp breaker with the correct gauge wire. Read the nameplate for exact amperage, and never share the circuit with other loads such as compressors. A heater that offers both 208 and 240 volt operation is helpful in commercial buildings, where the supply voltage differs from a typical house.

Choose the mounting style

Ceiling or wall-mounted units free floor space and keep the heating element away from vehicles and tools. Mount fixtures at least 6 to 7 feet above the floor and keep the manufacturer’s stated clearance from stored items. Portable 240 volt models exist but usually need a special plug, which limits where they can be used. Garages that store gasoline must also follow code on the height of heating appliances.

Look for controls and safety

A built-in thermostat, or a wall-mounted thermostat on a hardwired model, prevents overheating and saves electricity. Check for a safety listing such as UL or ETL, thermal cutoffs, and a sealed enclosure if sawdust, solvents, or fumes are present. A fan delay that keeps blowing after the element shuts off helps cool the heater safely and improves the lifespan of the unit.

Our Picks Reviewed

These notes lean on the format and brand named in each product, and they flag the checks that matter for a 240 volt install. Wattage and voltage differ between versions of the same line, so confirm both before buying and before ordering the breaker.

Dr. Infrared Heater DR-988 Garage Shop Heater

The name highlights a garage and shop heater from a brand known for infrared technology, aimed at people who work in larger bays and want warmth at the bench.

• Pro: an infrared design warms people and objects directly rather than relying only on heating the air.
• Pro: garage and shop use is in the product name, so it targets this job rather than a living room.
• Con: infrared heat feels strongest near the unit, so far corners of a big bay may stay cool.

Best use: a workbench zone where you stand or sit for long stretches. Skip it if you cannot install a dedicated 240 volt circuit or if your garage is very large with no clear work area.

Install tip: mount at the height the manual specifies and aim the heat toward the work area, not at the garage door.

King Electric Garage Heater

King Electric is a long-standing maker of electric heating equipment, and this garage-labeled product fits workshops and utility spaces that need dependable warmth.

• Pro: a brand focused on electric heat usually offers clear sizing guidance and wiring diagrams.
• Pro: garage-focused products are designed for mounting in work areas rather than living spaces.
• Con: specific wattage varies by version, so check the exact model before ordering a breaker.

Best use: a dedicated garage that needs a permanent, thermostat-controlled heater. Skip it if you want a plug-in heater that needs no wiring or electrician.

Install tip: have an electrician check the panel capacity before purchase, since adding a 240 volt heater to an already busy panel can require an upgrade. Ask for a labeled breaker, so the heater can be isolated quickly during service or a power problem.

Fahrenheat FUH Unit Heater

FUH is the model line, and unit heater means a fan-forced box mounted on the wall or ceiling to warm shops, garages, and utility rooms.

• Pro: unit heaters keep the floor clear for tools, workbenches, and vehicles.
• Pro: a fan moves heat quickly across the workspace, which shortens warm-up time.
• Con: it needs a hardwired installation, so it is not a quick swap or a weekend plug-in solution.

Best use: a permanent shop where the heater can stay in one spot. Skip it if you want to move the heater between locations or need silent operation for a hobby space.

Install tip: mount the unit on a solid wall stud or ceiling joist using the hardware in the box, and aim the louvers to circulate heat around the room rather than at a single workbench. Keep sawdust and paint dust off the intake with periodic vacuuming.

Dayton Electric Unit Heater

Dayton is a well-known name in shop and industrial equipment, and a unit heater format suits garages with 240 volt service and a need for steady output.

• Pro: a brand serving workshops is likely to offer reliable replacement parts and documentation.
• Pro: unit heaters are designed to run on a thermostat in a fixed location without attention.
• Con: unit heaters suit permanent installation, so a rental space is less ideal.

Best use: a detached shop with a dedicated sub-panel. Skip it if you share the space with a landlord who will not allow new wiring.

Install tip: confirm the voltage on the nameplate matches your circuit, whether 208 or 240 volts, and label the disconnect near the heater. A short note taped inside the panel door describing which breaker feeds the heater helps future owners and inspectors.

TPI Corporation Fan Forced Heater

Fan forced is right in the name, a style that pushes heated air into the room for quicker warm-up than convection alone, from a commercial heating specialist.

• Pro: a fan covers a larger bay faster than a still-air heater and reduces cold pockets.
• Pro: TPI is a commercial heating specialist, which points to durable construction for daily use.
• Con: fan noise is part of the deal, which can be tiring in a quiet hobby space.

Best use: a large bay where speed matters more than silence. Skip it if you do fine woodworking and want to avoid stirring dust through the air.

Install tip: a fan-forced heater needs clear space around the discharge, so keep shelves and hanging tools out of the airflow path. Close the garage door fully before judging performance, since open gaps can mask how well the heater is doing.

Marley Qmark MUH Unit Heater

The MUH naming marks a unit heater line with a commercial pedigree, appropriate for shops and mechanical rooms with 240 volt supply and a need for sturdy hardware.

• Pro: commercial-style units tend to be sturdy for daily use and frequent cycling.
• Pro: a ceiling or wall mount suits an organized workshop with tools along the walls.
• Con: commercial gear can look utilitarian and may be more than a casual garage needs.

Best use: a busy shop that runs the heater most of the winter. Skip it if your needs are modest and a smaller heater would be enough.

Install tip: commercial-style heaters often ship with limited instructions, so read the nameplate and wiring diagram carefully, and keep the manual in the shop. Schedule an annual cleaning of the element and fan before the cold season begins.

Which One Fits

Match the heater to the way the space is used, and let the breaker size confirm the final pick.

• Two-car garage workshop: Fahrenheat FUH, Dayton, or Qmark MUH unit heaters.
• Workbench zone: Dr. Infrared DR-988.
• Larger bay needing speed: TPI Fan Forced Heater.
• Dedicated garage install: King Electric Garage Heater.
• Temporary build sites: see our electric jobsite heater picks for portable options.

Common Mistakes

1. Buying by price instead of wattage for the square footage, then wondering why the garage never warms up.
2. Sharing a 240 volt circuit with other equipment, which trips breakers on cold mornings.
3. Mounting too low where tools or vehicles can bump the unit or block airflow.
4. Ignoring ceiling height, which affects how fast heat reaches the floor.
5. Skipping insulation and weatherstripping on the garage door, which wastes most of the output.

FAQ

Does a 220 volt heater cost more to run?

Running cost depends on wattage and hours, not voltage. A higher-voltage heater simply delivers more power through thinner wire and a smaller current.

Do I need an electrician?

For a hardwired unit, usually yes. Code requires correct breaker and wire sizing, and a licensed installer ensures the work passes inspection.

Is it safe to run in a garage with gasoline?

Follow code on heater height and use sealed units where vapors may be present. Store fuel cans well away from the heater.

Can I use a smaller heater instead?

For small bays, a plug-in model from our efficient electric heater guide may be enough if insulation is good.

What size breaker does a 4,000 watt heater need?

Typically a 20 to 25 amp double-pole breaker, but follow the nameplate and local code for the exact requirement.