[RE-wrenches] Stiebel Eltron SHW Collector condensation issue

[August Goers]

Hi David -



Doesn't sound fun. We experienced a similar problem with a 10-collector
system with Schuco Slim-Vs about 3 years ago. The collectors had lots of
condensation build up in them, especially during the rainy season. Schuco
stepped up and gave us new 2nd generation collectors under warranty. The new
collectors do not have the condensation problem. Apparently they redesigned
the ventilation method. Generally speaking I like the Schuco product
although now we're noticing a browning effect occurring near the in inlet
and outlet pipes on the absorber plate on Slim Vs installed a few years ago.
I have yet to deal with this issue.



It sounds like Stiebel is still working out their design. You'll probably
want to make sure that they have it fully figured out before replacing the
old collectors under warranty otherwise you might have the same problem!



Good luck with it.



Best, August



*From:* re-wrenches-bounces at lists.re-wrenches.org [mailto:
re-wrenches-bounces at lists.re-wrenches.org] *On Behalf Of *Dave Palumbo
*Sent:* Monday, June 20, 2011 12:58 PM
*To:* 'RE-wrenches'
*Subject:* Re: [RE-wrenches] Stiebel Eltron SHW Collector condensation issue



SHW Wrenches,



Our first experience with SHW flat plate collectors with a condensation
issue on the inside of the collectors’ glass cover. The system has two
Stiebel Eltron Sol 25 collectors (88” x 48” each) with a 82 gallon single
heat exchanger insulated tank in the basement of the home, with a SOM 6
solar loop controller. System installed fall of 2008.



Condensation problem was first noticed by homeowner late last December. The
collectors’ manufacturer, Stiebel Eltron, instructed us to watch and see if
the problem resolved on its own. It did not. Stiebel then instructed us to
drill small holes through the sides of the collectors near the top for
venting and more holes through the sides near the bottom for draining the
collector (see attached pdf for Stiebel’s venting advice). We did that in
early May of this year. The homeowner called us back with the same
condensation issue.



Stiebel then sent a bag of plastic insert venting plugs that required us to
drill out larger holes in the side of the collectors and pop these vent
plugs in. Plugs appear to be an attempt at making more venting area while
trying to keep the rain out. After we installed these plugs we still have
the same issue, homeowner still sees condensation and poor performance from
the SHW system.



The homeowner is now asking for new collectors under warranty.  Have others
experienced a similar SHW collector problem? And have collector
manufacturers stepped up with new collectors?



Thanks,



David Palumbo

Independent Power LLC

462 Solar Way Drive

Hyde Park, VT 05655**

*www.independentpowerllc.com *

NABCEP Certified PV Installer

Vermont Solar Partner

23 Years Experience, (802) 888-7194
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