The main function of the expansion tank in the heating system is to absorb the volume of water induced by temperature changes, and the absorption of the expansion tank must be greater than the volume increase that may occur in the system.

The amount of water expansion in the system can be calculated using the following formula

Ve=e*C

Ve: amount of expansion

C: total water capacity when the system is cooled

e: coefficient of expansion of water.

For example, when the heating system is from 0 to 100 degrees, the volume of water changes by nearly 4.5%.