Nominal capacity of the water pressure tank or expansion tank.
For normal operation of the tank, this volume must be at least a certain value. However, the calculation methods depend on the type of container (see above). So, for water pressure tanks, the total number of consumers (total water consumption) and pump performance are taken into account, for expansion tanks — the volume of the circuit, the thermal expansion of the coolant and temperature fluctuations. Detailed recommendations about these calculations can be found in special sources; another option is to contact a heating/water systems expert. We only note that instead of one large tank, it is quite possible to install several small ones — in the second case, their total volume will have a value.
As for the specific volume values, in most water pressure tanks it ranges from
11 – 25 litres to more than 100 litres (
101 – 150 litres ,
151 – 200 litres and even
more). At the same time, even small water supply systems are often equipped with very capacious water pressure tanks — to have a supply of water in case of failures in the water supply. In turn, the expansion tank does not require significant volumes to perform its tasks, so such products do not differ in capacity — many models hold
10 litres or less(although there are
...exceptions).
