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Sizing an Internal Expansion vessel???
Tomorrow I'm installing a Bosch ZBR 35 combi boiler for the first time. I'm just reading through the manual and Its says that that Internal Expansion vessel pre-charge pressure must equal the static system height of the boiler.
How exactly do I calculate whether or not I would need to add an on another expansion tank? I believe I need to find out how many gallons the system holds. Now this being a retrofit that might be tricky. Can anyone point me in the right direction here?