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I'm hoping that a variable speed pump(s) would be an easier answer to widely varying baseboard lengths (10',22',30',45',53')in an apartment where I am replacing boiler and re-routing pipes.

I've heard that there these variable speed circulators automatically adjust to varying system pressure and flow changes without use of bypass valves, etc.

(The only one I can find is a Grundfos alpha+ which is only sold in Europe as far as I can tell.)

Are there similar variable speed pumps avail here in US?

As far as I can tell, the Grundfos UPS series (ie 15-58) is a 3 speed pump, but it has to be pre-set manually and doesn't adjust on the fly to pressure /flow changes like the alpha+.

Can anybody shed some light on this
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