Potable Water / Hydronic Expansion Tank Sizing Calculator

1. Water Heater / Boiler Total Water Capacity (Gallons)

 Gallons

2. Supply Line Pressure

 PSIG

3. Air Pre-Charge (Tank Pre-charge should equal supply line pressure)

 PSIG   

4. Relief Valve

 PSIG

5. Start temperature

 °F

6. Ending Temperature

 °F

Click the button below to determine the total volume required.

Minimum Acceptance Volume  (Gallons) (Total expanded water to Accomodate)

 Minimum Tank Size  (Gallons)

Don’t know what size tank to choose? Always go bigger!