Hi Howie, I’ve had this same quandary when working with some specialty Pv-powered solar thermal projects. I really like the Laing pumps but they are very expensive and the D5 Solar version can be hard to get.
Recently I’ve tried the Chinese-made Topsflo DC pumps and despite some initial skepticism, have been pleasantly surprised at how well they have worked. A major plus for retrofit/replacement is that the Topsflo TD5 uses a volute that is essentially a clone of the El-Sid pump body-albeit in stainless rather than bronze. I have to say that I haven’t actually tried a retrofit using the Topsflo motor with an El-Sid pump body and impeller, but I suspect that it will work. At the very least the pump body is a perfect replacement for pipework set up for El-SIDS. I have a Topsflo TD5 working in a PV-powered hot-tub heater setup that has been working daily for almost 4 years now with no issues, so the quality seems pretty decent. Luke Christy Renewable energy consultant NABCEP Certified PV Installation Professional™: Solar Gain Services, LLC PO Box 531 Monte Vista, CO 81144 [email protected] 719.588.3044 > On Sep 14, 2020, at 21:49, Howie Michaelson <[email protected]> > wrote: > > > Hi All, > I need to replace 3-5 El Sid pumps I'm using in a low volume hydronic heating > system. Other than laing pumps, are there any recommendations for 12, 24, or > 48 vDC pumps? Having magnetic drives that mate with the impeller body of the > El Sids, would be a bonus. > Thanks, > Howie > Howie Michaelson > Sun Catcher > NABCEP Certified Solar PV Installer™ > > Solar Electric Systems Sales & Service > 802-272-0004 > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org >
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