How do I calculate expansion vessel size?

The size depends on total water volume, system temperatures, and static height. Our calculator computes this automatically per EN 12828.

What is expansion vessel pre-charge pressure?

Pre-charge should be 0.5 bar + (static height / 10). At 5m height, this equals 1.0 bar.

Instantly calculate the correct vessel size for your heating system. Based on EN 12828 standard and Henrad radiator specifications.

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EN 12828 Formulas

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Pre-charge Calculation

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Step-by-step Breakdown

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