Quote Originally Posted by skinnee View Post
It is true, the logged data is showing some major Total Dynamic Head gains over a single DDC and I for one did not expect anywhere near the performance scaling. I expected to see a 30-40% TDH gain at the sweet spot of 1.5GPM (roughly 340LPH), but we're seeing a 2x factor here.
Running pumps in serial will double head pressure, quoting engineeringtoolbox.com:
For two identical pumps the head will be twice the head of a single pump at the same flow rate.
It's the resulting gain in flow rate from doubling the head pressure we expect to be around 30-40%.