Anti-freeze as a heating system for a private house


The heat­ing sys­tems of pri­vate hous­es are usu­al­ly filled with water. In the case when in sub-zero weath­er the house stands for a long time with­out heat­ing, it freezes and increas­es in vol­ume, which leads to the fail­ure of pipes and all equip­ment. Antic­i­pat­ing this, the own­ers of the facil­i­ties use spe­cial anti-freezes of var­i­ous types for the heat­ing sys­tems of pri­vate hous­es. These flu­ids are effec­tive and easy to use. How­ev­er, they have their own advan­tages and dis­ad­van­tages.

Antifreeze liquid for the heating system — what is it?

Antifreeze liq­uid usu­al­ly con­sists of sev­er­al com­po­nents:

  • water;
  • eth­yl­ene gly­col and/or propy­lene gly­col;
  • inhibitor addi­tives that slow down the process­es of cor­ro­sion, oxi­da­tion, etc.

Such mix­tures clear­ly dif­fer from the usu­al pure water in such char­ac­ter­is­tics as flu­id­i­ty and ther­mal con­duc­tiv­i­ty. That is why they need spe­cial oper­at­ing con­di­tions.


The use of antifreeze is con­sid­ered an ide­al solu­tion for regions with a cold cli­mate. In addi­tion, it is per­fect for use in homes where the room is not heat­ed for some time. Antifreeze flu­id has a high vis­cos­i­ty. The prop­er­ty can be elim­i­nat­ed by adding pure water in per­mit­ted pro­por­tions. This allows you to save a sig­nif­i­cant amount of coolant, and hence mon­ey. In addi­tion, cir­cu­la­tion pumps will work much longer, as they will not work at full capac­i­ty.

Main advan­tages:

  • there is no need to drain the coolant from the sys­tem when it is turned off for a sig­nif­i­cant peri­od;
  • all com­po­nents of the heat­ing sys­tem remain filled with liq­uid, which pre­vents direct access of oxy­gen, and, accord­ing­ly, cor­ro­sion;
  • addi­tion­al addi­tives inhib­it the for­ma­tion of cor­ro­sion and scale;
  • the freez­ing tem­per­a­ture of the coolant is in the range from ‑30 to ‑65 — it all depends on the amount of added water;
  • heat­ing can be start­ed with­out any unpleas­ant sur­pris­es in the form of a cracked pipe and oth­er things.

Impor­tant! Anti-freeze helps extend the life of the heat­ing sys­tem com­po­nents.



Despite the pos­i­tive aspects, non-freez­ing liq­uid has some dis­ad­van­tages:

  • high price;
  • the heat capac­i­ty and ther­mal con­duc­tiv­i­ty are low­er than those of water, as a result — reduced heat trans­fer and rapid cool­ing of the sys­tem;
  • increased vis­cos­i­ty, which direct­ly affects the oper­a­tion of the boil­er and increas­es the ener­gy con­sump­tion spent on pumps;
  • some of the com­po­nents that make up the com­po­si­tion act like a poi­son on a per­son, there­fore safe­ty pre­cau­tions and the tight­ness of the sys­tem are espe­cial­ly impor­tant;
  • can only be used with spe­cial boil­ers and not in all types of sys­tems.

Impor­tant! Before using antifreeze, the expan­sion tank is checked at the very begin­ning. Often this com­po­nent of the sys­tem has to be changed to a larg­er one, since the expan­sion para­me­ters of antifreeze are high­er com­pared to water.

Features of use

The fill­ing of the new coolant is car­ried out only after the old one has been com­plete­ly removed. In addi­tion, it is impor­tant to check all seams for integri­ty. If nec­es­sary, worn parts are replaced.

The mix­ture is dilut­ed with water and imme­di­ate­ly poured into the sys­tem so that the con­cen­tra­tion remains at the desired lev­el.

Before start­ing the heat­ing sys­tem, it is nec­es­sary to take into account sev­er­al main fac­tors:

  1. More vis­cous antifreeze is more dif­fi­cult to cir­cu­late. There­fore, it is nec­es­sary to change the old pump in advance or change its oper­at­ing para­me­ters in order to cre­ate suf­fi­cient pres­sure.
  2. The liq­uid has a reduced heat capac­i­ty. To obtain the cal­cu­lat­ed heat trans­fer from the radi­a­tor, it is nec­es­sary to increase the tem­per­a­ture of the coolant.
  3. The boil­er must oper­ate with a pow­er reserve of at least 20%.
  4. It is nec­es­sary to replace all parts that con­tain zinc.
  5. The first launch is car­ried out at min­i­mum val­ues ​​with a grad­ual increase in per­for­mance.
  6. Can only be used in closed sys­tems due to the pres­ence of tox­ic sub­stances.

Gas boil­ers are con­sid­ered the best boil­ers for non-freez­ing. If we talk about elec­tric ones, then there is a dan­ger of their over­heat­ing of the heater.

Impor­tant! All rules for the use of antifreeze must be ful­ly observed. Oth­er­wise, it can lead to dam­age to the main com­po­nents of the sys­tem, clogged fil­ters and even poi­son­ing the body.

How to calculate the right amount?

To pur­chase the required amount of antifreeze, you need to know the exact capac­i­ty of the sys­tem. This infor­ma­tion may be pos­sessed by spe­cial­ists who cre­at­ed the project or per­formed the instal­la­tion. If the data is lost, you can still find out the para­me­ters, although you need to spend some time.

First you need to mea­sure the total length of the lines and dis­trib­ute them accord­ing to the diam­e­ter. After that, the area of ​​​​the flow sec­tion is cal­cu­lat­ed. All this is mul­ti­plied by the total length. The vol­ume of water in the radi­a­tors is added (data can be found in the rel­e­vant tech­ni­cal doc­u­men­ta­tion). The required total vol­ume of the coolant will be obtained.

The required amount of anti-freeze can be found at the time of pur­chase. The ratio with which antifreeze should be dilut­ed with water is indi­cat­ed on the pack­age.

The use of antifreeze in the home heat­ing sys­tem allows you to for­get about the dan­ger of freez­ing coolant and future repairs. The use of antifreeze has its advan­tages and dis­ad­van­tages, which must be tak­en into account when choos­ing and dur­ing oper­a­tion.


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