Expansion Tank Calculator

Expansion Tank Calculator

What expansion tank size do I need? Use our calculator to estimate the size of the hydronic expansion tank require for heating system.

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Also see

 

Heating System Volume*, L
Coolant Type
Volumetric Coefficient of Expansion*, β

 

Initial Pressure*, Bar
Maximum Pressure*, Bar

 

 

 

 

About the calculator

The expansion tank in the heating system is used to maintain the pressure in the system at a stable level. Our calculator allows you to estimate the volume of the expansion tank based on the volume of coolant or capacity of the equipment. Recall that the optimal pressure in heating systems of private homes – 1-2 bar. Theoretical basis of the calculation:

Vtank = (Vsum × e) / ((Pmax - Po) × (Pmax + 1))

  • Vsum – heating System Volume;
  • e – volumetric coefficient of expansion;
  • Pmax – maximum pressure;
  • Po – initial pressure.

 

What expansion tank size do I need?

  1. Enter the volume/power of your heating system.
  2. Choose a type of coolant
  3. Enter the coefficient of expansion of the fluid.
  4. Enter the initial pressure.
  5. Enter the maximum pressure.

 

Water expansion coefficient

°СCoefficient of expansion°СCoefficient of expansion
00.00013650.0198
100.00027700.0227
200.00177750.0258
300.00435800.0290
400.00782850.0324
500.0121900.0359
550.0145950.0396
600.01711000.0434

 

Water-glycol mixture expansion coefficient

°СGlycol, %
010203040507090
00.000130.003200.006400.009600.012800.016000.022400.02880
100.000270.003400.006600.009800.013000.016200.022600.02900
200.001770.004800.008000.011200.014400.017600.024000.03040
300.004350.007400.010600.013800.017000.020200.026600.03300
400.007800.010900.014100.017300.020500.023700.030100.03650
500.012100.015100.018300.021500.024700.027900.034300.04070
600.017100.020100.023200.026300.029400.032500.038700.04490
700.022700.025800.028800.031800.034800.037800.043800.04980
800.029000.032000.034900.037800.040700.043600.049400.05520
900.035900.038900.041700.044500.047300.050100.055700.06130
1000.043400.046500.049100.051700.054300.056900.062100.07290

 

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