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A detailed buying guide: how to choose a gas or diesel heater.
This section covers gas (propane-butane) and diesel space heaters for heating large areas quickly. They are used on construction sites, in warehouses, garages, workshops and greenhouses, and for drying plaster, concrete and paint in winter. The category is aimed at builders, workshops and farms where electric heaters lack the output needed. For temporary enclosures during winter work, read how to choose protective tarps and temporary covers.
Gas heaters run from a propane-butane cylinder, are light and heat up quickly, while diesel heaters are more powerful and run for long periods from a built-in tank. These are not petrol appliances, and only the fan is powered from the mains.
Direct-fired heaters are almost 100% efficient, but combustion products stay in the room, so they suit open or well-ventilated spaces. Indirect-fired diesel models with a heat exchanger and flue vent exhaust outside and can run in enclosed spaces where people are working.
Gas heaters usually deliver 10–50 kW and diesel heaters 20–100 kW or more. As a rough guide, 10 kW is enough for 80–120 m² of space with a standard ceiling height and average insulation. See how to calculate the required heater output.
Gas models burn about 0.7–3.5 kg/h of gas and diesel models 1.5–8 l/h of fuel, depending on output. Diesel heater tanks are usually 20–70 l, enough for 8–15 hours of continuous operation.
Airflow is usually 300–2500 m³/h: the higher it is, the further and more evenly heat is distributed. Some models allow an air duct to be connected. Read fan types and airflow capacity (m³/h).
The fan, ignition and controls need a 220 V supply, usually 30–300 W. If there is no mains power on site, the heater can run from a small generator. See how to choose a generator for a construction site.
Direct-fired heaters consume oxygen and emit carbon monoxide (CO), so provide constant ventilation and use a gas detector. Choose models with flame monitoring, overheat protection and a thermostat. Read how to choose portable gas detection and confined-space monitoring equipment.
Regularly clean the burner, fuel filter and nozzle, and check the gas hose and regulator. After the season, drain leftover fuel from the diesel tank and store the heater in a dry place. See how to maintain and store motor tools and engine-powered equipment.
At ToolsArmenia you can compare gas and diesel space heaters by heat output, heating type, fuel consumption, airflow and safety systems and choose the right model for your space.
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