Draper 230V Diesel and Kerosene Space Heater 20kW - Direct-Fired

Who is this for

The direct-fired diesel and kerosene space heater is used by workshop managers, site supervisors, and facilities managers who need to heat large, draughty commercial spaces quickly using liquid fuel rather than mains electricity. The 20kW output suits spaces that electric heating cannot warm to a working temperature, including vehicle workshops, construction site structures, agricultural buildings, and open-plan factory areas where the heat loss through large doors, uninsulated walls, and exposed roofing exceeds the capacity of electric alternatives. It is equally used by plant hire operators who provide temporary heating to construction sites, events, and agricultural clients across the UK.

This heater produces combustion gases as part of normal operation. It is only appropriate for spaces where continuous ventilation is available and confirmed before use.

Typical applications

• Heating a vehicle workshop or MOT centre during winter months, where large roller shutter doors allow ventilation and the 20kW output maintains a working temperature for mechanics handling cold metal components.

• Providing temporary heat to a construction site welfare structure or open-plan site building ahead of concrete work in cold weather, where a mains supply is available and adequate ventilation exists.

• Heating a farm building or agricultural machinery shed during winter maintenance periods, where the open structure provides continuous natural ventilation and diesel fuel is readily available on site.

• Supplementing inadequate permanent heating in a factory or warehouse during a cold spell, positioned to direct airflow across the working area and reduce cold-start time for machinery and materials.

• Providing rapid heat to a large semi-open temporary structure at an outdoor event or exhibition where the space is open at front or rear and ventilation requirements can be met.

• Heating a plant hire or equipment yard during winter maintenance work, where mechanics and engineers need a workable ambient temperature in a large open bay.

How to use

Step 1: Assemble the wheel axle, wheels, and transport handle before first use, following the assembly instructions supplied with the unit.

Step 2: Confirm the space is open or well-ventilated with continuous fresh air supply before positioning the heater. Do not position in an enclosed space.

Step 3: Position the heater on a firm, level, fire-resistant surface. Ensure a minimum clear distance of 2.5 metres from any combustible materials, curtains, or objects at both the front outlet and the rear of the unit.

Step 4: Fuel the heater outdoors or in a well-ventilated area with the heater switched off and fully cooled. Remove the fuel cap and fill with clean diesel or Grade 2+ kerosene to the Full mark on the fuel gauge. Do not overfill. Replace the fuel cap securely. On first use, fill the tank completely to allow the pump to bed in during the initial running period.

Step 5: Connect the heater directly to a 230V mains socket. Do not use an extension lead.

Step 6: Ensure the ON/OFF switch is in the OFF/O position before connecting. Move the switch to the ON/I position. The heater should start within five seconds.

Step 7: If the heater does not start, return the switch to OFF/O, wait ten seconds, then retry. If it continues to fail, check that there is sufficient fuel and that the fuel cap is securely fitted.

Step 8: To shut down, return the switch to the OFF/O position and unplug from the mains socket. Allow the unit to cool for at least 20 minutes before moving, refuelling, or storing.

Common mistakes

• Using in an enclosed or poorly ventilated space: This heater produces carbon monoxide during normal operation. Carbon monoxide is colourless, odourless, and lethal at low concentrations. Never operate this heater in any enclosed space regardless of how briefly it is needed.

• Using the wrong fuel: Only standard diesel or Grade 2 and above kerosene are acceptable fuels. Petrol, oil, used oil, paint thinners, and other flammable liquids must never be used. Incorrect fuel risks explosion and serious injury.

• Refuelling while hot or running: The heater must be fully switched off and cooled for at least 20 minutes before refuelling. Fuelling a hot unit risks ignition of fuel vapour.

• Connecting via an extension lead: The heater must plug directly into a 230V mains socket. A coiled or undersized extension lead generates heat and creates a fire risk.

• Leaving unattended while running: This heater must not be left unattended while connected to the power supply or operating. If you need to leave the space, switch off and unplug.

• Storing with fuel in the tank: Drain the fuel tank completely before storing the heater for extended periods. Fuel left in the tank can degrade and contaminate the fuel system, causing starting failures at the next session.

Safety

This is a direct-fired combustion heater. Burning diesel or kerosene produces carbon monoxide, a colourless and odourless gas that causes loss of consciousness and death at elevated concentrations. The heater must only be used in open or well-ventilated areas with continuous fresh air supply. It must never be used in residential spaces, sleeping areas, or any enclosed space. A minimum clearance of 2.5 metres must be maintained at the front outlet and at the rear of the unit at all times. Never position the heater near curtains, timber, fabric, fuel containers, or any combustible materials. Some external surfaces become extremely hot during operation. Do not touch any metal surface other than the handle or wheels during or immediately after use. Allow at least 20 minutes for the unit to cool before handling. Annual inspection and servicing by suitably qualified personnel is recommended to maintain safe operation.

Maintenance

Clean the heater body with a dry cloth only after each use, once the unit has fully cooled. Clean the fan guard and grille with a dry cloth or brush, removing any dust or debris. Clean the fuel filter at least twice during each heating season by removing it from the tank and rinsing in clean diesel. Drain the fuel tank before any period of storage using the drain plug on the underside of the tank. Wipe any fuel spillages immediately. Do not use water to clean the inside of the fuel tank. The nozzle, spark plug, photocell, and pump should be inspected, cleaned, and replaced where necessary at least once per year by suitably qualified personnel. The heater should be formally serviced at least once a year using only identical Draper replacement parts. Contact Draper Tools for servicing and spare part enquiries.