Gas-Fired Air Heaters

How a gas-fired air heater works and where it wins

Heat in a gas-fired heater comes from burning LPG from a cylinder, or natural gas from a fixed supply. The burner warms an air stream and the fan drives it into the space. Mains power runs the fan, ignition and controls only: typically 30–250 W from a 230 V socket, against 15 kW to roughly 100 kW of heat.

That ratio is the whole argument on site. Getting 50 kW out of an electric air heater means a 400 V three-phase connection; the gas equivalent needs a cylinder and a wall socket. In a shell-and-core building, a marquee or a warehouse with no distribution board, it is often the only workable heat source. The NORWIT.PL range is built mainly around Master equipment, including the BLP series; hoses and regulators sit in heater accessories.

Types of gas heaters — cylinder, natural gas, flued

The split follows the fuel and the way combustion gases leave the unit. A direct-fired heater has no flue, so combustion products enter the room with the warm air and a permanent fresh-air supply becomes mandatory. A sealed-combustion model delivers clean air only, at the cost of a flue routed outdoors. The diesel counterpart of the first group is the direct oil-fired air heater.

Sizing a gas heater to the volume of the space

Output follows the volume of the space and its insulation, not the floor area. Shell-and-core work and uninsulated warehouses take roughly 50–60 W per m³, an insulated room roughly 25–35 W/m³: 400 m³ therefore calls for about 20–25 kW, and 1,500 m³ for 70–100 kW. Spare capacity shortens warm-up but empties the cylinder faster — above 30 kW an 11 kg cylinder frosts over, so a 33 kg cylinder or a manifolded bank is used instead.

Gas-fired air heaters — frequently asked questions

Why buy a gas-fired air heater from NORWIT.PL

We size equipment against site conditions: output against room volume, cylinder format and the ventilation required. Where heating must run without cylinder changes, oil-fired air heaters take over; with three-phase power on site, the wider heating and cooling range applies. Orders are placed online, with delivery across Poland.