What heat guns are best for the garage. Heat guns for the garage: calculation of thermal power. Technical characteristics and calculation of thermal power

Many motorists, probably, more than once in their lives have come across the situation that in the cold season you need to dig deeper into your “iron horse”.

But at the same time, almost everyone faced one problem: frost and cold do not make it possible to do everything with high quality. repair work in the car. To overcome this problem, many car owners are thinking about how to efficiently heat their garage. Someone puts the heater, and someone warms his hands near the fire, divorced near the garage.

We would like to draw your attention to the comparative new way heating the garage space, which is associated with the application. In this article, we will talk in detail about which heat guns are the most efficient way to heat a garage, as well as by what criteria to choose them.

Varieties

The heat gun is a fairly efficient heating device that perfectly heats the room with the help of air heat flow.

The uniqueness of this type of equipment lies in the fact that the coefficient of its useful action is almost 100%.

Heat guns are usually divided into types depending on which energy resource is converted into a stream of warm air.

To date, there are the following types of heat guns:

electrical (units of this type operate from a conventional household electrical network);
diesel (the principle of operation of such devices is that diesel fuel or kerosene burns in a special chamber, releasing heat, which is pumped into the room with a fan);
gas (the principle of operation of this type of units is similar to the previous one, but liquefied gas is used as fuel).

Consider the advantages and disadvantages of using different types of thermal units for heating a garage.

Electrical

The main advantages of heating the garage with the help include the following points:

small dimensions allow you to install the unit anywhere in the garage;
automatic control of the device;
noiselessness of work;
high level fire safety.

However, there are some "pitfalls" in the use of this type of heat guns:

First of all, it is worth considering that the price of electricity is now not very cheap;
you need to carefully consider the electrical wiring of the garage, since the units of this type are quite powerful, and some garage power lines simply cannot withstand this;
electrical appliances of this type must have additional features, which include protection against overheating and automatic maintenance of temperature.

Gas

for garage premises have the following positive aspects:

quite economically consume gas;
quickly heat the garage;
equipped with automatic overheating and a carbon dioxide concentration sensor.

But do not forget about some of the nuances of gas heat guns for garage premises:

for the operation of this type of unit, you need a propane or butane cylinder, which is sometimes difficult to get;
supply ventilation should work in the garage, since in these devices, together with the warm air flow, the products of gas combustion also come out.

Important point: if the garage is not equipped ventilation system, then the efficiency of using gas heat guns will be reduced to zero, since frequent opening of the gate for ventilation will contribute to the escape of heat.

Diesel

Units of this type can have two heating options:

straight;
indirect.

In heat guns with direct heating, the combustion products exit together with the air heat flow into the heated room.

The device of diesel units with indirect heating allows exhaust gases to be removed outside the heated garage. This process is carried out using a special chimney, which can be presented in the form of a corrugated hose.

Therefore, it is very important to know that for garage heating it is necessary to choose with indirect heating.

The advantages of this type of units include the following points:

economical fuel consumption;
on one filling of the fuel tank, the heat gun can work up to 10–14 hours;
heats up the garage very efficiently.

How to choose the right

Before deciding on the right choice of a thermal unit, first of all, you need to know what criteria to select this type of equipment.

Watch a video in which an experienced user clearly demonstrates the features of an indirect diesel heat gun for garage heating:

The garage serves not only as a shelter for the car from the cold and rain, it is also a workshop in which minor car repairs are carried out. Repairing it is not so difficult in the warm season, however, when the frost season comes, working in the garage turns into an ordeal.

The conclusion suggests itself: the garage needs to be heated. But what if there are no communications in it, except for electricity? It remains to rely on autonomous systems heating or appliances powered by this type of energy.

Here is an example of a heat gun. This is a unit capable of heating the air in a room in a very short time period. Then it will be necessary to maintain the temperature, and it will be easier to do this, the more thoroughly the garage is insulated.

An additional advantage of insulation is the protection of metal from corrosion. Especially if the garage warms up from the inside: heated surfaces in contact with cold air become covered with condensate - moisture, which causes oxidation and destruction of the metal. This equally applies to both the structures of the garage and the car itself.

Garage insulation

The first rule of heating is insulation, but normative and with a mandatory ventilation device. The normative insulation of the garage is considered to be such that in any frost the air temperature in it will not be lower than + 5 ° C. The temperature should not be higher, since the car, leaving the heat to the cold in winter, will be covered with frost, which will have a devastating effect on the metal.

Ventilation is necessary for air circulation, since the garage is a place for the release of carbon monoxide and other gases harmful to health. Especially if it is supposed to heat it with a mechanism that, while working, also emits products of fuel combustion.

When choosing insulation and sheathing for garage insulation, you need to remember about its increased fire hazard: storage of fuels and lubricants and the possibility of sparking mechanisms. Based on this, materials must be chosen non-combustible or self-extinguishing.

If the garage is not capital, then its walls can be sheathed from the inside with a layer of foam plastic of 8-10 cm (you need to use "PBS-S", which includes a flame retardant that prevents combustion). Instead of foam, you can use its liquid and more cheap analogue- penoizol, which gives a seamless coating. Polyurethane foam has a lower coefficient of thermal conductivity, but it is twice as expensive as polystyrene foam.

Basalt wool is also used, but it must be protected from moisture.

The heat insulator is mounted on a crate made of wooden beams or aluminum profiles, then the skin is shot at it. The latter can be made from non-combustible plastic panels or corrugated aluminum sheets.

Ceiling insulation is arranged in a similar way, but you can make a false ceiling and insulate it, and there will be additional attic space between it and the roof.

Conditions for choosing a heat gun

When the garage is insulated, you can start heating it. The heat gun is capable of short term warm the air in the room and maintain its temperature in the selected range.

The choice of gun is based on the volume of the room, the temperature in winter time year, the coefficient of insulation, which depends on the thermal conductivity of the garage construction materials and the thickness of the layers of each of them. In addition, the frequency and intensity of use of the gun and the presence of communications in the room are taken into account.

The larger the garage, the colder the winters and the “thinner” the walls, the more power the heater needs. The more often and for more long time the garage needs heating, the more reliable and productive the unit is needed.

The presence of electrical wiring does not guarantee the possibility of heating with an electric heat gun. A heat gun for a garage with a power of 1-3 kW, which can be provided by single-core wiring with a voltage of 220 V, is not able to heat even a typical garage space measuring 3x6x2.5 m. For models with a power of 5-10-20 kW, three-core wiring with voltage of 380 V. And this means that the wiring needs to be changed: find out the possibilities of the nearest distribution zone, order a project, lay a cable. Yes, and electricity today is the most expensive type of fuel.

Types of heat guns

Heat guns work on the principle of a fan heater and are of three types, different in terms of the energy resource used for heating and, as a result, in design.

1. An electric heat gun consists of a heating element that warms the air and a fan that blows it into the room; its productivity fluctuates from 180 to 800 m3/hour and more. Experience proves that heat guns with a power of 1-2 kW are inefficient. The power should be from 4-5 kW, but for such a gun, as mentioned above, you need the appropriate three-wire wiring with a voltage of 380 V.

The lack of stationary electricity can replace a gasoline generator that generates electricity. True, appliances. generating electricity voltage up to 400 V are 5-6 times more expensive than those that give current voltage up to 220 V.

2. Diesel heat gun - the most economical device to use, but a hefty cost (from $ 1200 to $ 5000 and above). Diesel guns by design are divided into units of direct and indirect heating. In the first case, all combustion products enter the room. In the second - the device is equipped with a pipe for the output of burnt fuel to the outside. But, however, the gun takes air from the room to maintain combustion, so that the latter needs periodic ventilation. A diesel heat gun is a powerful unit, so it makes sense to use it for large rooms.

3. A gas-fired garage heater is probably the most economical option. Firstly, the unit itself is relatively inexpensive, and, secondly, and most importantly, it runs on the cheapest type of fuel - gas. One liter of liquefied gas is enough, on average, for an hour of operation of the gun (a cylinder - for 4-5 days of work in one and a half shifts).

But the gas gun has a significant drawback: it burns air and emits combustion products directly into the room. This makes it problematic to stay in it without constant ventilation, which, in turn, cools it down again.

The way out of the situation is seen as follows: if heating the garage is necessary constantly, albeit occasionally, then it is worth buying two guns (perhaps in cooperation with neighbors) - gas and diesel. The first is able to completely warm up the garage in 15 minutes. Then the second time comes - it maintains the required temperature in the room, removing the combustion products of the fuel outside. If the air supply is arranged from the street, then such a gun could work without special ventilation for an arbitrarily long time.

The choice of heat guns can be carried out both for living conditions: heating a house, a garage, a greenhouse, and for construction needs (when it is necessary to dry the room after finishing). In any case, in order to correctly select this type of electric heater, it is necessary to determine its power, manufacturer and design features. Next, we will tell readers "" how to choose an electric heat gun and what parameters you need to pay attention to when buying.

Specifications

The first thing you should start from is what parameters are suitable for the normal operation of an electric heat gun. The choice must be made according to power and suitable voltage.

As for the first characteristic, there are two calculation options. A simpler method of determining is that for heating 10 sq.m. rooms need at least 1 kW of power. In total, if you have a room of 4 * 6 meters (for example, a garage), simple calculations will show that you need to choose the power of an electric heat gun, not less than 3 kW. We determined it as follows: 4 * 6 will be 24 sq.m., taking into account the recommendations 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 you need to choose for heating the garage.

The second calculation method is more accurate, and we recommend using it when choosing an electric heat gun for your home. In this case, the formula does not take into account 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 ,

V is the volume of the room, calculated as the area multiplied by the height of the ceiling, m3;
dT - temperature difference environment and indoors;
Kt is the thermal conductivity coefficient. For walls with high-quality thermal insulation from 0.6 to 1. Medium thermal insulation or brick laying in two rows - from 1 to 2. Single-row brick laying, poor thermal insulation - from 2 to 3. Dilapidated hangars from profiled sheet or boards - a coefficient from 3 to 4$
860 - the number of kcal in 1 kW.

Power marking - 9 kW

In order for you to understand the whole essence of the calculation, again consider it with an example. You have decided to choose an electric heat gun for the garage, or rather, for heating the car. The volume of the room is the same 4 * 6 meters * 3 (ceiling height). The temperature inside the building should be +15 o C, outside now -20 o C. In total, the difference is 35 degrees. The garage is well insulated, so we take the coefficient 1. As a result, the calculation formula will look like: 72 * 35 * 1 \u003d 2520 kcal / hour. To convert the value to kW, you need to divide it by 860. The result is 2520/860 = 2.93 kW. Taking into account the margin, it is necessary to select a heat gun of at least 3.5 kW, which will be quite enough.

We 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 these are fan heaters, and already above - guns. with reviews of the most popular models we considered in the corresponding article!

The second, no less important technical characteristic is the operating voltage. There are electric heaters with a power of over 20 kW, which, of course, require a three-phase 380 V network to operate. You should also take this point into account if you decide to choose an electric heat gun for heating a garage or a summer house, to a new, more powerful one. Devices with a power of up to 7 kW can be connected to a single-phase 220 V network, if the wire section allows. It is best to perform before connecting to make sure that your wiring can handle such current loads.

Well, the last thing you need to pay attention to when choosing a heat gun is the duration of work. As you understand, when heating a room with a cannon, it must work without interruption for a long time. That is why device manufacturers indicate the value “24/1” or “24/2” on the case, which respectively means round-the-clock work with a break of 1-2 hours.

In addition, in order to choose the right electric heat gun according to its characteristics, pay attention to the noise level of its operation and the operating temperature range. Modern devices should work at temperatures not less than +5 o C to +40 o C.

Video review of heaters for home and construction

Room type

The next, no less important criterion for choosing an electric heat gun is depending on the type of room. For example, for a house, you need to buy indirect heating devices, the design of which includes an exhaust gas system. This is due to the fact that in a private house there are people and animals that can be negatively affected by exhaust gases. Although this point is not relevant in relation to the electric heater, you should still be aware of the importance of indirect heating. If you want to choose a heat gun for a greenhouse or for heating a car, it is better not to overpay and buy a simpler version of the design.

Here it should be noted one more 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 stationary type device that needs to be fixed in a certain place in the room.

Extra options

We figured out which electric heat gun is better to choose in terms of power and depending on the type of room. But that's not all you need to know about this issue. When choosing a heater, it is very important to pay attention to the following points:

As a rule, heat guns of various configurations are used for drying objects under construction, heating production facilities general profile because they are powerful high performance machines. But recently, many manufacturers have launched the production of small-sized devices up to 3-5 kW, so that numerous motorists have a garage heat gun on the farm, with which you can quickly heat a small room.

The equipment of this class is an effective device for heating any room with the help of directed hot air. The efficiency of any heat gun reaches almost 100%. On sale there are such varieties of these products:

Electric - they work for heating only when there is a household power supply.
Diesel - the principle of operation is based on the combustion of fuel in the combustion chamber, followed by heating the air flow.
Gas - the principle is similar to the second option, but they work on blue fuel, they are much more economical, because gas is cheaper.

Each type has its own specific features, advantages and small disadvantages.

Electrical

Electric fan heaters have the following advantages:

small dimensions allow you to install the product in almost any room;
full automatic control;
silent operation;
a fairly high level of fire safety.

The disadvantages include high cost electrical energy. In addition, the wiring must be checked before installing the heat gun so that it can withstand the stress of using such equipment. Devices must have overheating protection and automation to maintain an optimal constant temperature.

Diesel

These products have two types of heating: direct and indirect. In the first option, the space is heated by an air flow in which combustion products are present, so it is necessary to install supply ventilation. In the case of indirect heating, the heat gun has a design that allows combustion products to be removed from the combustion chamber through a special pipe, which is enough to be connected to a chimney pipe or a corrugated hose.

When a heat gun is chosen for the garage, it is necessary to think over and calculate all the options - take into account the volume of the room, how to draw a conclusion of the combustion products. Without a doubt, an indirect heating device is much better than an analogue with a direct heating method, when there is a danger of smoke in the entire room.

Experts include the following indicators to the merits:

economical fuel consumption;
heat guns of this class operate on one tank filling up to 14 hours;
efficient heating of a garage of any size, even two floors.

The disadvantages are diesel fuel cost, and the smell of burnt diesel fuel leaves an unpleasant amber, which is not drawn out by any ventilation system.

Gas

Such guns in relation to diesel counterparts have a number of advantages:

heat the room much faster;
heating of this type is many times more economical due to lower gas consumption and cost;
there is a sensor that reads the concentration of carbon dioxide;
automation that controls overheating of equipment;
propane or butane burns out completely - no need to install special exhaust systems, just the usual ventilation that is in every garage.

There is one, but quite a significant drawback: for the operation of the unit, you need liquefied gas bottle, which is not easy to get.

Advice! If there is no good ventilation in the garage, then all options will not suit you, the heating of the room will not be carried out in full due to frequent ventilation by opening the gate.

Choosing a heat gun

The main parameter when choosing a product is its power, excess power will wind up the meter in vain, and the disadvantage will simply not be able to provide sufficient heating to the garage. Experts, through measurements and various experiments, have established that 10 m 2 of any private garage can be heated with 1 kW of thermal power if the ceiling height is within 3 m.

Therefore, in the case when the area of \u200b\u200byour room is not more than 25 square meters. m, then you need to buy a device with a power of at least 2.5 kW, and given the severe frosts, it does not hurt to increase the power to 5 kW. In this case, it must be borne in mind that you will turn on the unit at full power only in exceptional cases. Which gun suits you - decide for yourself.

Garage insulation

Before installing any type of heater or fan heater, care must be taken to additional garage insulation, especially the gate: the less heat leaks, the longer the garage will maintain an acceptable temperature. Otherwise, the gun will work to heat the space surrounding the garage, that is, constantly.

Motorists should not forget that this room serves not only to shelter the car from weather disasters and thieves, but also to minor repairs and preventive work. In especially severe frosts, when you decide to thoroughly warm up the room, condensation may form on the iron gate due to the temperature difference, which will negatively affect the metal.

The optimal temperature for high-quality storage of equipment in winter period is +5 0 C.

To qualitatively insulate the walls - use sheets of special foam or penoizol. The latter material is considered the most progressive type of insulation, it retains heat much better, is very similar to polyurethane foam in terms of thermal conductivity, but is much cheaper.

We insulate the ceiling in the same way, but for the gate there are several options:

foam blocks - perfectly keep heat and do not absorb moisture;
extruded polystyrene foam - has even better rigidity, perfectly retains heat;
foil polyethylene foam - differs in that one side is covered with foil, it is used in combination with the first types of insulation.

During all work on insulation, it is necessary to solve the issue of better ventilation. For this you can do hood directly from the interior of the garage - direct access to the outside. A cement-asbestos pipe of standard diameter and size will suffice.

Features of using guns

Today, it is electric fan heaters of various types and devices that are considered the most popular for quickly heating a garage, although the condition of the wiring leaves much to be desired. Therefore, fire inspectors like to visit such public places use for drawing up acts on various violations.

It is no secret that the indirect cause of all fires in garages is the improper use of heaters. different kind from homemade to factory-made models. As a rule, the fault here is 100% of the users: before connecting an electric gun of any power, you need to consult with the specialists of the power grid. In addition, certain rules for the operation of products of any kind must be observed.

After purchasing the equipment, it is necessary to let it settle in the heat for at least 2 hours.
If this is a diesel version or a gas heat gun, purchased specifically for a garage insulated in advance, it is better to start them for the first time on outdoors to burn off the factory grease.
Before switching on the electrical version, it is necessary to check for the presence of condensate on heating elements, as well as inspect the grounding of the garage wiring.
A used oil gun is checked for foreign objects in the fuel tank before fuel is filled.
When using a chimney, it must have good draft and a minimum of bends.
When connecting the gas gun, check all connections for leaks, otherwise the first inclusion may be the last.

Install the device only on a flat surface, the distance from the outlet nozzle to walls or other objects is at least 3 m, 0.5 m is enough on the sides, and 1.5 m on top. room.

As for the cost: diesel devices are considered the most expensive: their price is from $ 200, gas ones are in the middle position within $ 150, and electric options are from $ 50. Having done right choice, you will forget about frozen hands and an engine that does not start from the cold for at least six months - it will be comfortable to work in the garage, even though there are severe frosts outside the gates.

A common problem faced by garage owners during the cold season is this. The solution of the issue is connected with the characteristics of the room itself, with the choice of the heating element, with the frequency of its use. Very often owners use different types heat guns, each of which has certain advantages and disadvantages. For example, the leader in heating rate is gas gun for the garage, and the safest is electric. In the article we will dwell on their characteristics in more detail.

On the market, choosing a heat gun is quite simple, the main thing is to understand what requirements the unit must meet in order to quickly warm up and maintain the desired temperature in a particular room. The division of guns into types occurs depending on the type of thermal energy source used. Let's explore the most popular options.

Gas

Most economical way is heating the garage with a gas gun, while the selected power depends on the area of \u200b\u200bthe room. In addition, this option provides a fairly quick warm-up and maintenance of the required temperature in the box, and the gun itself is inexpensive. A number of models are equipped with overheating and carbon dioxide concentration sensors. However, attention should be paid to a number of features when using a gas gun in a garage, namely, to take care of the presence of forced ventilation.

Attention. During the operation of the unit, oxygen is burned, and combustion products hazardous to human health are released.

In the absence of ventilation, constant air renewal by opening the gate will be required, and this will minimize the effort to maintain comfortable temperature and call into question the issue of savings;

Purchase a propane or butane tank. It should be borne in mind that, depending on the power, a gas gun for a garage consumes from 0.5 to 1 liter of liquefied gas per hour, therefore, with frequent use, replacing the cylinder will become a weekly duty;
it is necessary to monitor the condition of the gun, since the gas is an explosive substance.

In general, the use of a gas heat gun is justified by the need to quickly heat up a room or any surface, for example, it is often used by installers stretch ceilings or for warming up the surface of the earth during outdoor work.

Diesel

Units running on diesel fuel are distinguished by the most successful characteristics, as they combine high performance with the use of cheap fuel. They are simple and reliable in operation, however, the cost of a diesel heat gun is extremely high compared to other types, and its payback is possible only with frequent use, for example, in auto repair shops.

Kinds

Guns running on diesel fuel are stationary and portable. They are also divided into two types:

Direct heating, that is, combustion products remain in the room;
Indirect heating, with the help of a corrugated hose, carbon dioxide is removed to the outside. Such guns require a connected outlet to run a built-in fan to remove combustion products.

However, in any case, there is a need to ventilate the premises, not only for human safety, but also to maintain combustion.

By the way, a standard tank is enough to work for 10 - 14 hours.

Electrical

The safest is an electric heat gun, which consists of a heating element that generates heat and a fan that directs it into the room. As a rule, the device is equipped with a thermostat, has small size. The obvious downsides are:

high energy consumption, which leads to significant cash costs;
if necessary, to match the device, as it will be subjected to significant stress.

But in general, electric gun is good option to maintain the required temperature in the box and is the most fireproof in comparison with other thermal appliances when heating the garage in cold weather.

Which heat gun do you prefer?

The question of how to choose the optimal heat gun is purely individual and depends on the following factors:

from the area of \u200b\u200bthe room to be heated, the degree of its insulation;
frequency and duration of use of the device;
the presence of ventilation and suitable wiring;
the ability to maintain a given temperature;
the safety of the device for life;
from the cost of the gun and the cost of fuel.

It is also worth considering the power of the device, which is calculated based on the ratio of 1 kW: 10 m2 (for severe frosts, even more power will be required). Thus, for a garage with a ceiling height of 3 m and an area of 25 - 30 m2, the optimal gun power will be 3 - 5 kW.

Regardless of the type, a garage heat gun is selected for specific goals and objectives. Therefore, when choosing a particular model, one should be guided by the recommendations outlined above, remembering the degree of safety of a particular device, its capabilities and affordability.