Where to put a portable heater: a safer position

A handle can make a heater look as easy to place as a toolbox, but where to put a portable heater is a fire-safety decision before it is a comfort decision. The useful position is on clear floor, away from curtains, furniture, stored fuel and anything that could cover the casing or block the vents. You also need a route for the lead, room to switch the unit off, and enough patience to let it cool before you lift it again.

In short

Keep a portable heater about a metre from soft furnishings, following London Fire Brigade advice, and leave the inlet and outlet open. Do not dry clothes on it, do not leave it heating an empty room, and switch it off and let it cool before moving it. In a workshop or garage, placement also has to account for the electrical supply, LPG and petrol vapour. A convenient empty patch of floor does not make the wrong heater safe for the space.

The metre and the empty floor

Start with genuinely empty, stable floor rather than the gap nearest your chair or workbench. London Fire Brigade advises keeping portable heaters about a metre from soft furnishings. That is a practical reference for curtains and upholstered chairs. It is not permission to ignore the instructions supplied with your heater.

Look at the whole clear zone, not only the front grille. A curtain can move, a chair can be pushed back and a cloth can fall from a bench, so a position that looks clear in a still room may not stay clear once work begins. Keep the air inlet and hot-air outlet unobstructed. Do not turn the heater into a surface for tools, paperwork or clothing.

The same test applies in a workshop. If the only possible position is tight against a bench, beside stored materials or in the path of a car, the floor is not truly empty. Move the surrounding items or choose another heat source.

Direction matters as well as distance. Pointing a blower straight at your legs under a desk crowds a heat source into a space bounded by furniture and your body. An open floor position lets you see the heater, reach its controls and notice if an item has moved into its path.

For larger equipment, remember the weight behind the handle. The top pick in our 15 kW fan-heater comparison, the DAHTEC IFHO3-150G black, is listed at 14.5 kg with a steel casing, non-slip feet and a heat-insulated handle. Those details explain how it stands and moves. The listing does not state tip-over protection, so do not assume a safety feature that is absent from the product information.

What not to put on it or near it

Do not use a portable heater as a drying rack. London Fire Brigade advises against using portable heaters to dry clothes. A glove, cloth or jacket on the casing puts material that can burn against the heat source and may block the airflow the heater needs.

In a garage, damp gloves and workwear naturally end up beside the warmest object. Give them a separate drying place. The heater should stay visible and uncovered, with its vents open. If an item can fall onto the unit, it is still too close.

Keep curtains, upholstered furniture and other soft items about a metre away, and check again after anyone moves a chair or opens a door. Do not leave the unit running in an empty room because it is portable. You need to be present to notice a shifted curtain, a blocked vent or a damaged plug, and you should know how to switch it off before you start it.

Water and weather are another false shortcut. All four 15 kW listings in the comparison carry an indoor use field. Some electric listings also print IP24, but that does not turn the indoor field into an outdoor claim or justify standing the heater in rain. Position the model only where its listing and instructions permit.

Leads, plugs and cylinders

A clear heater position is incomplete if its lead creates a separate problem. Before switching on, look from the appliance to the supply and keep the route visible. If a plug is warm, discoloured or otherwise heat-damaged, stop. Electrical Safety First identifies heat damage at a plug as a warning sign, and moving the heater to a different corner will not repair it.

The supply must match the machine. A 15 kW electric blower is not a powerful version of a domestic plug-in model. The featured DAHTEC listing requires a 400 V three-phase supply and says it cannot use a standard 220–240 V household socket. Compare that requirement with smaller options in our fan-heater guide. Wiring, plug and circuit questions belong with a competent person, not an improvised adaptor or a more convenient floor position.

Gas heaters add a different set of placement limits. HSE warns that LPG leaks can collect in confined areas and that volatile fuels need careful storage. A garage containing a car or petrol vapour is not a place to treat a propane blower as casual spot heating, even if there is room around the casing.

Keep vents open when a gas heater is in use. Treat the cylinder as fuel, not as a stand. Store it outdoors and, where you can, change it outdoors. Do not place the cylinder in the heater's hot discharge or crowd the hose around the casing. If the instructions conflict with the space, or you cannot keep ventilation open, stop and choose equipment whose fuel and supply suit the location.

Moving a portable heater

Switch the heater off and let it cool before you move it. That is London Fire Brigade's advice, and it applies when the product has a carry handle or the adjustment seems minor. The handle is a means of carrying the machine after shutdown. It is not evidence that the casing, grille or discharged air is cool during operation.

There is no universal cooling time in the guidance used here, so do not rely on an invented five-minute or ten-minute rule. Follow the manufacturer's instructions and wait until the unit can be handled without touching hot surfaces. A steel-cased blower is also heavier to lift in a rush than a small domestic heater.

Plan the new position before lifting. Clear the destination, check that the vents will remain open, confirm the supply route and remove curtains, clothing or workshop materials from the surrounding area.

Reassess the clear zone after the move. Turning the heater can redirect hot air towards a bench, stored materials or your legs. If you cannot create a stable, open destination, leave the appliance off.

Never use relocation as a response to an electrical warning. A hot or discoloured plug, a damaged lead or an unsuitable supply needs attention in its own right. Keep the heater switched off and ask a competent person to assess electrical damage or supply work. Do not test another socket in the hope that position was the cause.

When placement is the wrong problem

Sometimes the room, fuel or supply is the real constraint. An electric 15 kW blower that requires 400 V three-phase cannot be made suitable for a household socket by standing it nearer the wall. An indoor use field is not overridden by IP24 printed elsewhere in a listing. A propane heater does not become appropriate for a confined or poorly ventilated place because you leave clear floor around it.

Stop if you see heat damage or discolouration at the plug. Stop if the only available position puts curtains, soft furnishings, clothes or stored materials inside the clear area. Stop if vents cannot remain open, if LPG and volatile fuel create a process-fire concern, or if you would have to leave the heater operating in an empty room.

Placement is also the wrong problem when repair or installation is required. A competent person should deal with damaged electrical parts and questions about the correct supply. Do not solve a burner, regulator or fuel-system fault by moving the appliance.

Choose the heater around the space you actually have. A 15 kW machine suits substantial heat output. A smaller fan heater is the more relevant starting point when the room and the socket are modest. The usable choice is the one you can position on clear floor, power correctly, supervise and cool before carrying.