What Is the Best Heater for a Workshop or Warehouse? Electric, Infrared, Gas & Diesel Heaters Compared

Keeping a workshop, warehouse or industrial space warm during colder months can be challenging. Large doors, high ceilings, poor insulation and frequent movement of people or materials can cause heat to disappear quickly, while heating an entire building may not always be practical.

Choosing the right workshop heater or warehouse heater is therefore not simply about buying the model with the highest heat output. You need to consider the size and height of the building, insulation, ventilation, available electrical supply, access to fuel and, importantly, whether you need to heat the entire space or only the areas where people are working.

Electric, infrared, gas and diesel heaters all have their place. Understanding how they work will help you choose a heating solution that suits your workshop, warehouse, garage, construction site or industrial facility.

What Type of Heater Is Best for a Workshop or Warehouse?

There is no single heater that is best for every industrial space.

For a small or enclosed workshop, an electric heater can be one of the simplest options where a suitable electrical supply is available.

For a specific workstation or part of a large building, infrared heating can be particularly useful because it directs heat towards people, equipment and surfaces rather than relying only on heating the entire volume of air.

For larger workshops, warehouses, construction areas and other demanding applications, gas or diesel heaters can provide considerably higher heat output, provided the operating environment, ventilation and fuel requirements are suitable.

A good starting point is to ask:

• How large is the space?
• How high is the ceiling?
• How well is the building insulated?
• How frequently are external doors opened?
• Do you want to heat the entire building or only a working zone?
• What electrical supply is available?
• Is suitable ventilation available?
• Can gas or diesel be stored and used safely?
• How quickly does the space need to warm up?

These factors are usually more important than choosing a heater based on price or kW output alone.

Electric Heaters for Workshops and Warehouses

An electric workshop heater is a practical choice where convenient, straightforward heating is required and a suitable electrical supply is already available.

Electric fan heaters draw air through the unit, heat it and circulate warm air through the surrounding area. They require no diesel or gas storage and produce no combustion gases at the point of use.

When is an electric heater a good choice?

Electric heaters can work particularly well for:

• Small and medium-sized workshops
• Garages
• Individual work areas
• Storage rooms
• Enclosed workspaces
• Temporary or supplementary heating
• Areas where fuel storage is undesirable

They are also easy to move between different areas when a portable heating solution is required.

What should you consider?

Electrical supply is one of the most important considerations.

Smaller electric heaters may operate from a standard supply, while more powerful industrial heaters can require higher-capacity connections. Before choosing a heater, check the voltage, amperage and plug requirements against the electrical supply available in your workshop.

For a very large warehouse or poorly insulated building, attempting to heat the entire air volume electrically may also require considerable heating capacity. In these situations, a different heating method or targeted infrared heating may be more practical.

Explore our range of Electric and Industrial Heaters.

Infrared Heaters: A Different Way to Heat a Workspace

Infrared heating works differently from a conventional fan heater.

Instead of primarily heating and circulating the surrounding air, infrared radiation transfers heat directly towards people, machinery, floors and other surfaces within its effective area.

This distinction can be particularly important in large workshops and warehouses with high ceilings or frequent draughts, where warming the entire volume of air may not be necessary.

Where does infrared heating work well?

Infrared heaters can be useful for:

• Individual workstations
• Production areas
• Assembly areas
• Garages and workshops
• High-ceiling industrial spaces
• Warehouses
• Loading or dispatch areas
• Buildings where doors frequently open
• Situations where only part of the building needs heating

For example, if employees spend most of the day within one production area of a large warehouse, it may make more sense to concentrate heat around that working zone rather than attempting to raise the temperature throughout the entire building.

Is infrared always electric?

No.

This is an important distinction when comparing industrial heaters. Infrared describes the way heat is transferred, not necessarily the energy source.

Industrial infrared heaters may be powered by electricity, gas or diesel.

An electric infrared heater combines targeted heating with a straightforward electrical supply, while a diesel or gas infrared heater can provide substantially higher heating output for more demanding industrial applications.

The correct option depends on the required output, working environment, ventilation and available energy source.

Gas Heaters for Workshops and Industrial Spaces

Gas heaters are commonly used where a high level of heat is required quickly.

Portable industrial gas heaters typically use LPG and combine a burner with a fan to move heated air through the working area. This makes them useful for temporary and high-output heating applications.

They can be suitable for:

• Large workshops
• Warehouses
• Construction environments
• Agricultural buildings
• Garages
• Temporary work areas
• Industrial spaces with suitable ventilation

One advantage is the ability to produce significant heat from a relatively compact portable unit.

However, gas heaters require appropriate fuel handling and ventilation. Because combustion takes place within the equipment, the manufacturer's instructions regarding ventilation, positioning, clearances and intended operating environment must always be followed.

It is also worth remembering that a gas heater is not necessarily completely independent of electricity. Fan-assisted industrial models may still require electrical power for the fan, ignition or controls.

Diesel Heaters for Warehouses, Workshops and Construction Sites

A diesel space heater is often considered when substantial heating output is required across a larger or colder working environment.

They are widely suited to demanding applications such as:

• Warehouses
• Large workshops
• Construction projects
• Agricultural buildings
• Industrial units
• Garages and service areas
• Temporary heating and drying applications

Their high heating capacity and portability can make them particularly useful where a smaller electric heater would not provide sufficient output.

However, the type of diesel heater matters.

Direct vs Indirect Diesel Heaters

A direct-fired diesel heater delivers heated air directly into the working area. This provides fast, powerful heating, but combustion products enter the same environment, so these heaters should only be used where the manufacturer's requirements for ventilation and operating conditions can be met.

An indirect-fired diesel heater separates the heated air from the combustion gases and provides an exhaust or flue connection. This configuration can be more appropriate where cleaner heated air is required, provided the heater and exhaust system are installed and used correctly.

For workshops or warehouses where people are working for long periods, the ventilation and exhaust requirements should therefore be considered before selecting the heater, rather than after it has been purchased.

Electric vs Infrared vs Gas vs Diesel Heaters

The right option depends on the job rather than simply the fuel type.

Heater Type	Best Suited To	Main Advantage	Main Consideration
Electric Heater	Small to medium workshops, garages and enclosed areas	Simple operation with no fuel storage or combustion gases at point of use	Electrical supply and required heating output
Electric Infrared Heater	Workstations and targeted heating	Direct heat where it is needed	Positioning and coverage area
Gas Heater	Larger ventilated workshops, construction and temporary heating	High heat output from a portable unit	Ventilation and safe fuel handling
Diesel Heater	Warehouses, large workshops, construction and industrial areas	High heating capacity for larger spaces	Fuel, ventilation and exhaust requirements
Diesel/Gas Infrared Heater	Industrial work zones requiring powerful targeted heat	Combines high output with direct heating	Fuel supply, ventilation and operating environment

The table is a useful starting point, but the size and condition of the building still need to be considered before selecting a specific model.

What Size Heater Do I Need for My Workshop or Warehouse?

One of the most common mistakes is selecting a heater based only on the floor area of the building.

Start by considering the approximate room volume:

Length × Width × Height = Room Volume

But volume is only part of the calculation.

You should also consider:

Insulation

A well-insulated workshop retains heat much more effectively than a metal shed or older industrial building with limited insulation.

Ceiling Height

The higher the building, the larger the volume that may need to be heated. This is especially important when using systems that primarily heat the surrounding air.

Doors and Draughts

Roller doors, loading bays and frequently opened entrances can result in substantial heat loss.

Required Temperature

There is a significant difference between preventing a workspace from becoming extremely cold and maintaining a comfortable working temperature throughout the day.

Heating the Whole Building or One Zone

This is one of the most important questions.

If only two employees work within one section of a large warehouse, heating the entire warehouse may not be necessary. A targeted infrared solution could be more appropriate.

If the whole workshop needs to maintain a relatively consistent temperature, a fan-assisted or higher-output heating solution may make more sense.

For larger industrial spaces, calculating actual heat loss gives a much better basis for selecting equipment than relying on a simple square-metre recommendation.

What Is the Best Heater for a Small Workshop?

For a smaller workshop with a suitable power supply, an electric fan heater is often a practical starting point.

It is straightforward to operate, requires no fuel storage and can quickly provide supplementary heat in the immediate working area.

If you spend most of the day at one bench or machine rather than moving throughout the entire workshop, an electric infrared heater may also be worth considering because the heat can be directed towards the occupied area.

The final choice should still take insulation, room height and available electrical capacity into account.

What Is the Best Heater for a Large Workshop?

Large workshops require a different approach.

Before selecting a heater, consider whether you genuinely need to warm the entire building.

If the whole workshop is in continuous use, a higher-output electric, gas or diesel solution may be appropriate depending on the electrical supply, ventilation and operating conditions.

If only particular areas are occupied, industrial infrared heating may provide a more targeted solution.

Large doors and high ceilings should also be considered because they can make conventional air heating more difficult.

What Is the Best Heater for a Warehouse?

Warehouses are often among the most difficult buildings to heat effectively.

They can have:

• Large internal volumes
• High ceilings
• Loading doors
• Regular air movement
• Different temperature requirements in different zones
• Only a small proportion of the floor occupied by workers

For this reason, the best warehouse heating solution may not involve heating every cubic metre of the building.

Infrared heating can be useful for specific picking, packing, assembly or workstation areas, while higher-output gas or diesel heaters may be suitable where broader temporary heating is required and operating conditions allow.

For continuously occupied or temperature-sensitive environments, the heating system should be considered as part of the wider building and ventilation strategy.

What Is the Best Heater for a Garage?

For a garage or smaller vehicle workshop, electric heaters are often convenient because they provide fast supplementary heating without requiring fuel storage.

Infrared heating can also work particularly well around a workbench or defined service area.

Larger automotive workshops may require more powerful heating, but additional factors such as ventilation, vehicle exhaust extraction, flammable materials and the heater manufacturer's operating restrictions must be taken into account.

What Is the Best Heater for a Construction Site?

Construction heating often requires portability and high output.

Gas and diesel heaters are commonly suited to temporary heating and drying applications where appropriate ventilation and operating conditions are available.

Electric heaters can also be useful where sufficient electrical power is already available and combustion heating is undesirable.

The correct solution will depend on the stage of construction, building enclosure, available power, required temperature and whether workers are continuously present.

What Is the Best Heater for a Poorly Insulated Workshop?

More heat output does not automatically solve an insulation problem.

In a draughty or poorly insulated building, much of the heat used to warm the air can quickly escape through doors, walls, roofs and air leakage.

Where improving the building envelope is not immediately possible, targeted heating can sometimes be more practical than attempting to warm the entire space.

This is one of the situations where infrared heating deserves consideration because it can direct heat towards occupied areas rather than relying entirely on maintaining a high overall air temperature.

Safety and Ventilation When Using Workshop Heaters

Safety should be part of the heater selection process from the beginning.

Gas, diesel and other fuel-burning appliances require particular attention because combustion can produce harmful gases. The heater should only be used in environments permitted by the manufacturer, with the necessary ventilation and exhaust arrangements.

Before operating any industrial heater:

• Read and follow the manufacturer's instructions.
• Maintain the required clearance around the heater.
• Keep combustible materials away from hot surfaces and outlets.
• Do not cover the heater.
• Use the correct fuel specified by the manufacturer.
• Check electrical connections and supply requirements.
• Ensure adequate ventilation where required.
• Keep air inlets and exhaust routes clear.
• Position portable heaters on a suitable stable surface.
• Have fuel-burning equipment inspected and maintained as required.

Do not choose a gas or diesel heater for a poorly ventilated enclosed area simply because it offers higher heat output.

The heating solution must suit the environment in which it will actually operate.

Common Mistakes When Choosing a Workshop or Warehouse Heater

1. Choosing by floor area alone

Ceiling height can dramatically change the amount of space that needs to be heated.

2. Buying a heater with insufficient output

An undersized heater may run continuously while still failing to maintain the required temperature.

3. Ignoring the available electrical supply

A high-output electric industrial heater may require a connection that is not available in every workshop.

4. Ignoring ventilation requirements

Fuel-burning heaters must be matched to an appropriate operating environment.

5. Heating an entire warehouse when only one area is occupied

Targeted infrared heating may sometimes be more suitable for individual work zones.

6. Choosing on purchase price alone

Purchase price, fuel or electricity use, working hours and heat loss all contribute to the true operating cost.

How to Choose the Right Industrial Heater

Before buying, collect a few basic details about your application:

Space dimensions: length, width and ceiling height.

Building condition: insulation, doors, windows and obvious draughts.

Application: workshop, warehouse, garage, construction, agriculture or another industrial environment.

Heating requirement: whole-building heating or targeted workplace heating.

Available supply: standard electricity, three-phase electricity, LPG, diesel or another suitable source.

Operating pattern: occasional heating, several hours per day or continuous seasonal operation.

Ventilation: particularly important when considering gas or diesel equipment.

Providing this information makes it much easier to compare suitable heater types and select the correct level of output.

Unicraft Workshop & Industrial Heaters from Millennium Machinery

Millennium Machinery supplies Unicraft electric, infrared, gas and diesel heaters for a wide range of workshop, warehouse, garage, construction and industrial applications.

Rather than selecting a heater simply by its maximum kW rating, speak to our team about the space you need to heat and how the equipment will be used.

Tell us your room dimensions, ceiling height, insulation, available power supply, ventilation and required working conditions, and we can help you narrow down the most suitable heating options.

Explore Workshop & Industrial Heaters

Preparing Your Workshop for Winter? Think About Backup Power Too

Heating is only one part of preparing a workshop, warehouse or business for colder weather.

If your operation depends on electrically powered heaters, machinery, compressors, lighting, IT systems or other essential equipment, it is also worth considering what would happen during a power interruption.

A correctly selected backup generator can help maintain power to selected essential equipment and reduce disruption when the mains supply is unavailable.

Generator selection should be based on the equipment you need to operate, total starting and running loads, required voltage and whether the generator is intended for occasional backup or regular use.

Explore Power Generators

For more guidance, read our:

How to Choose the Right Generator for Your Workshop, Business or Farm in Ireland

Frequently Asked Questions

What is the difference between an infrared heater and a fan heater?

A fan heater primarily heats air and circulates it around the room. An infrared heater transfers heat directly towards people, objects and surfaces within its effective area. This makes infrared particularly useful for targeted or zonal heating.

How many kW do I need to heat my workshop?

The required heating capacity cannot be determined reliably from floor area alone. Room volume, ceiling height, insulation, outside temperature, desired indoor temperature, doors, draughts and heat loss should all be considered.

Should I choose electric, gas or diesel heating for a construction site?

The answer depends on available power, ventilation, required heat output and the stage of construction. Electric heating avoids combustion at the point of use, while gas and diesel heaters can provide high-output portable heating where the operating environment is suitable.

Where can I buy workshop and warehouse heaters in Ireland?

Millennium Machinery supplies Unicraft electric, infrared, gas and diesel heaters for workshops, warehouses, garages, construction and industrial applications, with professional advice available to help match the heater to your working environment.