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Flange Rotated 90 Deg
Wet rotor circulation pump, with flanged connection. (Flange parallel to shaft). Pre-selectable speeds to adjust the capacity on "S" versions. Bronze body for domestic hot water applications
Reviewed by 1 customer
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Comments about Star S 21BFX, 3-Speed Bronze Star Series Circulator, 1/12 HP:
Note that the illustration is not the flanged version, which fits the description.
I'm using this pump in a solar hot water system, open drainback, with 18 ft head going to the collector. The Wilo handles the head using the medium setting which is about 80 watts - the only pump I could find that could handle the head with so little power. It is virtually silent, much quieter than my Taco 055. Very nice quality in the casting, nice flanges. The only thing I don't like is the electrical connectors - difficult to use with a stiff #14 wire, which is admittedly overkill. Only time will tell if the unit is durable as well. I am very satisfied so far.
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Q:Do I need anything additional to connect this pump to 3/4" copper pipe?
A:You just sweat it on. Don't over heat and if not sure take the motor/rotor
A:This circulator connects to system piping with a flanged connection. You would need to buy either 3/4" threaded flanges with sweat adapters or 3/4" sweat flanges in order to connect to 3/4" copper pipe.