[RE-wrenches] Another pump quesiton

[Luke Christy]

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
sgsrenewables at gmail.com
719.588.3044


> On Sep 14, 2020, at 21:49, Howie Michaelson <Howie.Michaelson at gmail.com> 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
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