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It's a bit of a mish mash to be honest. The 25-80 should be more than sufficient for that zone so the second circulator needs to come out at some point. Probably when the Low Loss Header goes in
I was just intrigued as to how it worked as logically it doesnt make sense to me that a second slower pump can work in tandem with one which is capable of much higher flow rates. But it does work, so not sure.
It sounds like Ballcocks to me but like I say, it's not an experiment I would get involved in. What's the point?