Zone valves or circulator pumps?

Old 03-04-10, 07:01 AM
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Zone valves or circulator pumps?

Narrowing down my choices on a new system configuration. Should I go multiple circulators (4 zones plus indirect, 5 total) or one pump and 5 zone valves? Will the one pump (B&G Alpha) be enough for second floor split loop, 3 first floor zones and the indirect (4 feet away). 3/4" feeds to baseboard on first & second floor, continuous loops, no monoflows or anything. Boiler is in basement. Will the Alpha be strong enough for the second floor split loop when all other zones are calling? Thank you.

Last edited by MM1957; 03-04-10 at 08:45 AM.
Old 03-04-10, 12:32 PM
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From what I know, it really depends on head loss of your plumbing configuration (charts and calculations available on the net) and the head range of your circulator pump. I think for simplicity you cant beat one circulator and multiple zone valves. I have an associate with a with big 2 story ranch, 5 heat and 1 DHW zone on 2 tiny taco 007 circulators running at the same time working as one pump through 6 zone valves. He has no problems and it is super simple to manage. Aquastat, taco zone control box and zone valves. Again the simplicity is great, I have one taco 007 and 3 zone valves on my system and it is working great. It is really preference but if your pump is strong enough it should be no problem. I checked the specs on your pump I believe its a Grundfos Alpha, the head range is good and its about twice the taco 007, also the gpm is good too. You should be okay with it but do the math to be sure. Good luck

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