<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Kelly,<div><br></div><div>Although I'm no plumber, I think there is a difference between "mixing valves" and "anti-scald valves". I believe mixing valves don't change with water temperature, so it's hard to get consistent water temperature at the faucet with varying solar hot water temperature. I believe anti-scald valves adjust cold water input with hot water temperature to prevent an unsafe temperature at the faucet. I'd talk it over with your plumber.</div><div><br></div><div>take care,</div><div><br><div>
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<br><div><blockquote type="cite"><div><font class="Apple-style-span" color="#000000"><br></font>On May 19, 2010, at 2:14 AM, Kelly Keilwitz, Whidbey Sun & Wind wrote:<br><br><blockquote type="cite">Thermal wrenches,<br></blockquote><blockquote type="cite">I'm having an ongoing issue with mixing valves in my own system not keeping a steady mix domestic HW temperature as the tank temperature varies with solar heating. If I set it for (say) 122˚F mix when the tank is 135˚, it seems to hold that differential at all tank temps - i.e. when the tank is hotter the mix is too hot (sometimes dangerously so), and when colder the mix is too cold for a comfortable shower. Thus, I need to change the setting all the time.<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">I'm now using a Honeywell valve with a 90˚ - 145˚ range. This is a replacement for a valve with a wider range that acted the same way. Any ideas, suggestions for better valves, or....?<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">This has me wondering how many of our SWH customers are experiencing a similar thing, but just aren't bothered enough to say anything. We seem to have encountered many plumbing situations where the mixing valve allowed weird backflow or siphoning situations to mess with system operation, especially with HW recirculation. I thought I had all such causes eliminated on my system, but maybe not.<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Thanks for sharing your experience with such matters.<br></blockquote><blockquote type="cite">-Kelly<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Kelly Keilwitz, P.E.<br></blockquote><blockquote type="cite">Whidbey Sun & Wind<br></blockquote><blockquote type="cite">Renewable Energy Systems<br></blockquote><blockquote type="cite"><a href="mailto:kelly@whidbeysunwind.com">kelly@whidbeysunwind.com</a><br></blockquote><blockquote type="cite">360-678-7131<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">_______________________________________________<br></blockquote><blockquote type="cite">List sponsored by Home Power magazine<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Options & settings:<br></blockquote><blockquote type="cite"><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">List-Archive: <a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">List rules & etiquette:<br></blockquote><blockquote type="cite"><a href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Check out participant bios:<br></blockquote><blockquote type="cite"><a href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a><br></blockquote><blockquote type="cite"><br></blockquote><br><br><br><br><br><br><br>_______________________________________________<br>List sponsored by Home Power magazine<br><br>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br><br>Options & settings:<br><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br>List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org<br><br>List rules & etiquette:<br>www.re-wrenches.org/etiquette.htm<br><br>Check out participant bios:<br>www.members.re-wrenches.org<br><br></div></blockquote></div><br></div></body></html>