Max. heating area
A very conditional parameter that slightly characterizes the purpose by the size of the room. And depending on the height of the ceilings, the layout of the room and the equipment, the actual values may differ significantly. Nevertheless, this item represents the maximum recommended area that the heat gun can effectively heat.
When determining the maximum area, usually, a universal formula is used that is valid for all heaters: 1 m² of floor space in a room with a standard ceiling height of 2.5 m requires 100 W of thermal power. Therefore, if the ceiling height differs markedly from this value, the actual heating area should be recalculated; for more details on scaling, see “Maximum thermal output".
Safety features
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Overheat protection. A safety system that turns off the device when the temperature rises critically. The technical features of such a system can be different: for example, in electric models (see "Power supply") it monitors the temperature of the heater, in gas and diesel models (see ibid) it monitors the temperature inside the housing. However, such protection prevents overheating and its unpleasant consequences — from a breakdown of the unit to a fire in the room.
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Flame sensor. The safety system used in gas and diesel guns: monitors the presence of a flame in the combustion chamber, and when it is attenuated, it shuts off the fuel supply. It not only helps to avoid unnecessary fuel costs but above all prevents filling the room with gas, the formation of a puddle of flammable liquid and other dangerous consequences.
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Motor shutdown delay. This function provides a specific shutdown mode for the heat gun: when the switch is set to the appropriate position, the fan motor does not turn off immediately, but after some time has elapsed. It is done to cool the heating elements — otherwise, the residual heat from them (which is practically not removed after the fan is turned off) could lead to overheating, with all the ensuing consequences. The temperature sensor is usually responsible for turning off the motor, and the delay time can be up to
...several minutes — depending on the characteristics of a particular heater, as well as the temperature of the air supplied by the fan.
— Ignition system protection. Security systems are installed mainly in diesel-type heaters. Usually, it provides limiting the number of attempts to ignite the fuel — for example, less than three. It reduces wear on the ignition system and prevents excess fuel from entering the combustion chamber, which could lead to various troubles.
— Tip-over protection. A safety system that provides automatic shutdown of the heater in case of tilting. The vast majority of modern units are not designed to work in the lying position, and in some cases, this position can be dangerous even if normal operation is maintained: for example, when falling forward, air circulation is disturbed, and the surface under the device becomes very hot. Shutdown in case of a fall helps to avoid unpleasant consequences.
