Heat-carrying fluid for heating systems

The heating medium in a liquid heating system is the substance through which heat is transferred from the boiler to the radiators.

Types of heat carriers for heating systems:

Water

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It is the most common liquid for heating a private house. Water as a heat-carrying fluid for heating systems has its advantages and disadvantages.

For a high-quality heating system, water, as a heat carrier, must meet certain requirements:

- oxygen level in water is not higher than 0.05 mg / cubic meter.

- range of acidity level 8-9.5.

- hardness 7-9 milligram equivalents / liter. If the stiffness indicator is exceeded, it will lead to lime deposits in the elements of the system.

Soda ash, sodium orthophosphate is often added to the water. You can also use distilled water.

Pros:

Cons:

Non-freezing liquids

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The main feature of non-freezing liquids is that their structure does not allow them to crystallize with decreasing temperature completely. The structure changes from a liquid to a gel-like state. This property preserves the integrity and operability of pipes and radiators of the heating system.

However, not all antifreeze fluids are recommended for use in open-type systems with natural circulation. In addition, the antifreeze liquid must not come into contact with unprotected galvanized surfaces, rubber, and silicone seals.

Propylene glycol

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It is harmless to humans. Therefore, it can be used in open circulation systems of a heat exchanger and double-circuit heating boilers.

At a particular concentration, it can corrode sealing elements.

Ethylene glycol

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It is the most common, affordable, and cheap antifreeze for home heating systems.

Ethylene glycol is poisonous; therefore, it cannot be used in open heating systems and double-circuit boilers that work both to heat a house and to heat tap water.

It is not environmentally friendly, and it is only used in a single-circuit boiler system.

Ethylene glycol is not as viscous as propylene glycol. It circulates faster through the system, carries heat more quickly, has a high heat capacity, and works well in small radiators. Cheaper than propylene glycol. Service life - up to 10 years.

 Glycerol

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It is harmless to humans. It does not corrode sealing elements, does not burn, has anti-corrosion properties. Working temperature varies from -30 to + 110 ° C.

 Bischofite

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This heat-carrying fluid contains water salts of magnesium chloride. It is a natural mineral. The bischofite solution has a freezing point lower than that of pure water. It is chemically safe, but at the same time, it can accelerate the corrosion of metals. Applicable up to -30℃.