The people you buy your system from should be able to tell you what size expansion tank you need for your system size.
Is that 4% of GPM. Or of GPH.4% of circulated volume
Apologies, 4% of fill.Is that 4% of GPM. Or of GPH.
Since 4% of 600GPM is 24. And 4% of 36,000GPH is 1440.