Expansion tank selection

Enter the volume of the heating system (pipes, boilers, devices) in m3.

Enter the supply temperature of the heating system

Enter the maximum operating pressure of the system (usually the pressure at which the safety valve starts to open). The program defaults to 3 bar

Enter the pre-charge pressure of the tank. The program defaults to 1.5 bar (This is the typical pressure set in expansion tanks)
The pre-charge pressure should be set when connecting the tank to the suction side of the circulation pump:
p ≥ pst + 0.2 [bar], where pst is the hydrostatic pressure (height difference between tank connection and highest point of the system)
When connecting the tank to the discharge side of the pump, the above pressure should be increased by the pump head

The program will automatically select the expansion tank capacity up to 1500 dm3, and then you can download the selection result as a PDF file in A4 format

If the program calculates a tank capacity of more than 1500 dm3, there is no single tank with such a large capacity (>1500 dm3) and you need to select several tanks that will add up to more than the calculated capacity and enter your own selection text in the visible text field. This text will be visible in the PDF file after saving.

For example, if the program calculates a total tank capacity of 2300 dm3, you can select 2 expansion tanks of 1500 dm3, or 3 tanks of 800 dm3 (depending on the situation and space in the boiler room)

Typical expansion tank capacities are available in the "Standard Sizes" tab