The choice of electric heat guns can be carried out both for living conditions: heating the house, garage, greenhouse, and for construction needs( when it is necessary to dry the room after finishing).In any case, in order to correctly choose this type of electric heater, it is necessary to determine its capacity, manufacturer and design features. Next, we will tell the readers of "Sam Electrician" how to choose the most suitable option for their own conditions.
- Technical specifications
- Room type
- Additional parameters
Technical characteristics
The first thing you should start from is what parameters are suitable for the normal operation of the electric heat gun. The choice must be made in terms of power and suitable voltage. 
As for the first characteristic, there are two variants of calculation. A simpler method of determination is that for heating 10 sq.m. The room needs at least 1 kW of power. Total, if you have a room of 4 * 6 meters( for example, a garage), simple calculations show that you need to choose the power of an electric heat gun, not less than 3 kW.We determined this in the following way: 4 * 6 will be 24 sq.m., taking into account the recommendation that the power reserve should be at least 20%, we have: 2.4 * 1.2 = 2.88 kilowatts. The closest value is 3 kW, which should be selected for the heating of the garage.
The second calculation technique is more accurate, and we recommend it when choosing an electric heat gun for a house. In this case, the formula takes into account not the area of the room but its volume and the coefficient of thermal conductivity of the walls. As a result, the formula looks like:
P =( V * dT * Kt) / 860 ,
where:
- V - room volume, calculated as the area multiplied by the height of the ceiling, m3;
- dT - difference in ambient and indoor temperature;
- Kt is the coefficient of thermal conductivity. For walls with high-quality thermal insulation from 0.6 to 1. The average thermal insulation or masonry brick in two rows - from 1 to 2. Single row brick laying, poor thermal insulation - from 2 to 3. Dilated hangars from proflist or boards - a coefficient from 3 to4 $
- 860 - the amount of kcal per 1 kW.
Power labeling - 9 kW
So that you understand the whole essence of the calculation, let's consider it again with an example. You decided to choose an electric heat gun for the garage, or more precisely - the heating of the machine. The volume of the room - all the same 4 * 6 meters * 3( ceiling height).The temperature inside the building should be + 15 ° C, overboard now -20 ° C.Total, the difference is 35 degrees. The garage is insulated well, so the coefficient is 1. As a result, the calculation formula will look like: 72 * 35 * 1 = 2520 kcal / hour. To convert the value to kW, you need to divide it into 860.The result is 2520/860 = 2.93 kW.With allowance for the stock, it is necessary to select a heat gun of at least 3.5 kW, which is quite enough.
Power table
Immediately draw your attention to the fact that there is a conditional classification of devices by power. It is believed that up to 5 kW are fan heaters, and already over - guns. The review of household heaters with reviews of the most popular models we considered in the relevant article!
The second, not less important technical characteristic is the working voltage. There are electric heaters, power over 20 kW, for which you need, of course, a three-phase network of 380 V. This point you should also take into account and if you decide to choose for heating a garage or giving an electric heat gun, replace the electrical wiring in the house with a new, more powerful. Devices up to 7 kW can be connected to a single-phase 220 V network, if the cross-section of the wires allows. It is best to make a calculation of the cable cross-section in terms of power and current before making the connection to make sure that your wiring will cope with such current loads. 
Well, the last thing you need to pay attention to when choosing a heat gun - the duration of the work. As you understand, when heating a room with a cannon, it should work without interruption for a long time. That's why the device manufacturers point to the case "24/1" or "24/2", which means 24 hours a day, with a break of 1-2 hours.
In addition, to properly select an electric heat gun according to the characteristics, pay attention to the noise level of its operation and the operating temperature range. Modern devices should operate at temperatures not less than + 5 ° C to + 40 ° C.
Room type
The next, no less important criterion for choosing an electric heat gun - depending on the type of room. For example, for the house you need to buy indirect heating devices, the design of which includes the exhaust system of exhaust gases. This is due to the fact that in a private house there are people and animals on which the exhaust gases can adversely affect. Although with respect to the electric heater this point is not relevant at all, you still need to be aware of the importance of indirect heating. If you want to choose a heat gun for a greenhouse or a warming machine, it's better not to overpay and buy a simpler version of the design. 
There should also be noted one important nuance - if you want to choose an electric heat gun for temporary heating, buy a portable case. If the heater has to work for a long time in one place, for example, in the country - choose a fixed type device that you need to fix in a certain place in the room.
Additional parameters of
With what electric heat gun is better to choose according to power and depending on the type of room, we sorted out. But that's not all you need to know about this issue. It is very important when choosing a heater to pay attention to the following:
- The technician must have a temperature regulator, at least stepped. The thermostat will control the economy and efficiency of the electric heater.
- Pay attention to the fact that there is always a function of automatic shutdown in case of overheating. If the case falls accidentally, and the heater starts to overheat, there will not be a fire hazard situation, becausethe thermostat will work.
- The metal case is much better than plastic and composite. First, the metal is stronger, and secondly, if the electric power is cut off sharply, the hot TEN will not damage the metal case of the heat gun. At the same time, plastic may melt and cause a fire.
- Cylindrical devices are able to warm up the room several times faster, becausethe heating element is a helix. This option is more suitable for electric heating of the garage, if you need to quickly warm the car in the morning.
- The choice of electric heat guns of a rectangular shape is more rational for heating a private house and a dacha, which is related to the type of internal heating element that does not so dry the air and is less dangerous in terms of spontaneous combustion.
- Before purchase, check if there is a service center of the selected manufacturer in your city, becausein case of failure, repairs can be costly. It should immediately be noted that it is better to choose an electric heat gun from manufacturers such as Ballu, Master, TEPLOMASH, Veab and Dantex.
- Few people know, but the whole-impeller impeller creates the most powerful airflow. If you need a good electric heater for construction, for example, for the installation of a stretch ceiling, we recommend choosing the device with this fan!
We also recommend to see the model from the popular company Aurora, which provided the characteristics of the device in the video example:
That's all I wanted to tell you about how to choose the right electric heat gun for a house, villa and garage. We hope that the information was interesting for you, and, most importantly, useful!
Related material:
- The most economical electric heating in the house
- How to get light into the garage
- Wiring diagram of single-phase electricity meter to 220V network
