There are many ways to effectively heat a garage. One of the most effective, the application of a water heating system. Due to their numerous advantages, the demand for them is quite high. But they have one big drawback — in severe frosts, the water in the pipes can freeze. To avoid this, many garage owners pour various antifreezes into the complex. As practice shows, the garage heating system on antifreeze is quite effective.

Types of arranging a garage with a heating system with antifreeze as a coolant:

  • revision of technological connections and joints;
  • installation of additional radiators;
  • installation of exhaust ventilation.

Advantages and disadvantages

Attention: Antifreeze does not freeze in heating systems even in severe frosts. This is precisely its main advantage. The maximum that can happen to him, he will go into a state of jelly-like substance. But this will not affect the quality of heating. After heating, it will again become liquid.

Antifreeze is able to be effectively used in high-temperature circuits, as it has a high boiling point, which is 110-125 degrees. But when choosing a temperature regime, it must be borne in mind that it heats up more slowly than water.

Antifreeze has not only advantages, but also some disadvantages that must be taken into account.

The disadvantages of antifreeze are:

  1. High viscosity compared to water. For pumping it through the pipes, additional power is required. The circulation pump will need to be replaced with a more powerful one.
  2. The heat capacity of this coolant is 1-15% lower than that of water. To compensate for this, it will be necessary to install additional radiator sections, heat exchangers, etc.
  3. High fluidity, which requires good sealing of all connections on the heating system. Rubber gaskets should be replaced with paronite.
  4. The service life of antifreeze, like many other antifreezes, is no more than 5 years. After that, it needs a complete replacement.
  5. When stagnant, it forms white flakes, which, when settling, can spoil the heating structure.


Antifreeze has another drawback. The most significant. He is poisonous. It is necessary to use this composition in the heating system so that it cannot enter the room. The heating system must not have any leaks and be sealed at the connections. After all, as already mentioned, the fluidity of this substance is greater than that of water, and it is able to seep through even a slight crack.

An antifreeze leak is not immediately detected, and in order to avoid inhaling its vapors, which easily escape under the influence of high temperature, you should carefully consider the condition of the heating system and inspect it from time to time for any damage.

Attention: If a leak is found, immediately repair it, ventilate the garage and thoroughly mop the floor.

In addition, in no case should it be poured into the heating system if a double-circuit boiler is used, since the substance can easily enter the DHW circuit and the consequences of this will be very unpleasant.

Filling in the heating system

If you are not afraid that the antifreeze is poisonous and you decide to pour it into the heating rack, you must fully comply with safety precautions both during filling and during subsequent operation.

Remember, before pouring, antifreeze should be diluted. It should not be used in concentrated form, as it can cause damage to the heating boiler and circulation pump. By diluting antifreeze, you can independently choose the desired ratio of water and antifreeze. But first you should find out the lowest temperature at which its crystallization is possible. Most often, such information is available on the packaging.

Attention: Before pouring antifreeze, you should choose the right temperature. Its name indicates the temperature at which it crystallizes. For example, A40-M (-40 degrees). Please note that ready-made coolant should not be diluted with water. It is necessary to use concentrates that consist of 95% ethylene glycol. Using it for pouring, you can independently choose the desired ratio of concentrate to water.


When diluting it with water, it should be borne in mind that if it freezes at a temperature of -40 degrees, then the ratio of water and concentrate should be 1:1. At freezing temperature — 30 degrees 2: 3. And if freezing occurs at -20 degrees, the ratio is 1:2.

Before pouring it into the heating system, all the available coolant should be drained from it, the radiators and pipes should be thoroughly rinsed. All internal contamination must be removed. It is best to wash several times, so you can achieve the best result. If any antifreeze was previously poured into the system, it must be completely drained. It should not be mixed with poured antifreeze.

The system used to heat the garage on antifreeze requires the tightness of the heating system and the replacement of rubber gaskets. If necessary, the detected violations should be eliminated. A pressure test must be carried out, which is necessary to check the heating system for possible excesses of normal pressure. Thanks to this procedure, hidden defects can be detected.

But first you should find out the quality of the concentrate in order to find out whether it can be poured into the heating system. To find out, make a solution in a small glass container and leave it for a few days. The temperature should be room temperature. If there is no formation of foam or precipitation, it can be used. Otherwise, it should not be used.

Only after all these procedures, using a special pump, should you start pouring antifreeze. This should be done carefully.

Attention: It is imperative to use a protective suit, respirator and gloves. The garage at this time should be well ventilated. If during pouring it gets on the skin, it should be immediately washed off with water. If you have a chemical burn, see a doctor.


Heating system

Heating your garage with antifreeze requires the installation of larger radiators and a more powerful circulation pump. In addition, attention should be paid to installed radiators and pipes. Since antifreeze and many similar antifreezes are made on the basis of ethylene glycol, you should find out in advance whether they can be used as a coolant in the presence of aluminum or bimetallic radiators and galvanized pipes.

Types of antifreeze: green, red, blue. Which one to choose — the differences and the impact of each on the metal of the heating system and nodes.

Otherwise, the antifreeze used may adversely affect the heating system, for example, causing metal corrosion.

Before pouring antifreeze, be sure to make sure that it does not harm your heating system. Also, consider the risks and costs associated with its operation. Consider the lower the concentration of the coolant, the less likely it is to get burned if it gets on the skin.

Antifreeze, can be used quite effectively for heating the garage. Its use allows you to achieve heat in it, and avoid freezing of the system even in severe frosts. But it should be used with caution, as it is very toxic. When using it, you must follow the safety rules. In no case do not use it in the presence of a double-circuit boiler.


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