<div dir="ltr">One other thought, on some vacuum tube collectors, if I remember correctly, you can simply remove some of the tubes. <div><br></div><div>Brad Bassett</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Sun, Jun 15, 2025 at 7:35 PM Bradley Bassett <<a href="mailto:bbassett2@gmail.com">bbassett2@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">When I found that my system was somewhat oversized, I plumbed in a mixing valve and a heat dump radiator (a few Cu pipes) in the crawl space to dump the heat. It's on the solar supply line and it works like a charm. It actually adds a very modest amount of heat to the crawl space, not enough to notice. It's going on 20 years without any issues, probably because it's an anti-freeze system so no mineral buildup in the mixing valve. I've also heard of using a fin radiator under the eve for this instead of the crawl space. The crawl space was easier for me.  <div><br></div><div>Brad Bassett</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Jun 15, 2025 at 5:02 PM david quattro via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">There must be a variable mixing valve that is informed and controlled by a thermocouple</div><div dir="auto"><br></div><div dir="auto"><br></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Jun 15, 2025 at 4:46 PM Jay via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi all<br>
<br>
I’ve inherited an incorrectly sized solar thermal evacuated tube system. <br>
It’s too many tubes for the use most of the year. <br>
<br>
Does anyone know of a design or product that can remotely cover them?  <br>
I can find shade cloth of course that I can cover them but something remote control would be better <br>
<br>
Thx<br>
Jay<br>
<br>
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