<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:12pt"><div><span></span> </div><div><span>For years we installed, "Double Whammy" bypass valves enabling folk to go 'solar only', 'solar preheat', or 'primary only', hoping folk would bypass and turn off their primaries during the summer season. We did this ourselves for years. However, going back on those 'DW' systems years later and asking the owners if any of them ever, ever used them even after having paid for them... and the answer was always, 'no'. Like Jeremy says, just turn off the primary and the boiling hot water from the solar tank should keep the primary tank nice and hot. </span></div><div><span></span> </div><div><span>In the mean time we have moved to a 120 gallon Rheem single tank DB system with a steca controller and a digital Intermatic timer that only turns the
heater on for an hour twice a day in the winter and is kept off all summer long.</span></div><div><span></span> </div><div><span>Smiles,</span></div><div></div><div> </div><div><b><font face="arial"></font></b></div>
<div><b><font face="arial">Andrew Koyaanisqatsi</font></b></div>
<div><font face="arial">President</font></div>
<div><b><font face="arial">Solar Energy Solutions, Inc.</font></b></div>
<div><font face="arial">Since 1987,</font></div>
<div><font face="arial">Moving Portland and Beyond </font></div>
<div><font face="arial">to an Environmentally Sustainable Future.</font></div>
<div><font face="arial"></font></div>
<div><font face="arial"><b>503-238-4502</b></font></div>
<div><b><font face="System"><a href="http://www.solarenergyoregon.com/" target="_blank" rel="nofollow">http://www.solarenergyoregon.com/</a> </font></b></div>
<div><font face="comic sans ms"><b></b></font> </div>
<div><font face="comic sans ms"><b>"Better one's House too little one day</b></font></div>
<div><font face="comic sans ms"><b>than too big all the Year after."</b></font></div>
<div> </div><div><br></div> <div style="font-family: arial, helvetica, sans-serif; font-size: 12pt;"> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div dir="ltr"> <div class="hr" style="margin: 5px 0px; padding: 0px; border: 1px solid rgb(204, 204, 204); height: 0px; line-height: 0; font-size: 0px;" contenteditable="false" readonly="true"></div> <font face="Arial" size="2"> <b><span style="font-weight: bold;">From:</span></b> Kirk Herander <kirk@vtsolar.com><br> <b><span style="font-weight: bold;">To:</span></b> RE-wrenches <re-wrenches@lists.re-wrenches.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Tuesday, September 24, 2013 3:19 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> [RE-wrenches] SHW - parallel tanks<br> </font> </div> <div class="y_msg_container"><br><div id="yiv4039629597"><style><!--
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--></style><div><div class="yiv4039629597WordSection1"><div class="yiv4039629597MsoNormal"><span style="font-size: 14pt;">Hi,</span></div><div class="yiv4039629597MsoNormal"><span style="font-size: 14pt;"> </span></div><div class="yiv4039629597MsoNormal"><span style="font-size: 14pt;">Every summer I get a few calls from annoyed hot water customers who can’t stand hearing their boiler fire merely to keep the indirect tank up to setpoint temperature, when of course the solar preheat tank is at 160 degrees or better at mid-day. So what’s the best way to transfer heat, in essence temporarily putting the tanks in parallel, from the solar tank to indirect? I can think of a few possibilities using a circulator and temperature controller, and a additional connection between the tanks, such as the tank drains plumbed together as a return line, but where is the best place to locate the circulator in a standard preheat arrangement (i.e. hot output of
solar preheat plumbed to cold input of indirect tank)?</span></div><div class="yiv4039629597MsoNormal"><span style="font-size: 14pt;"> </span></div><div class="yiv4039629597MsoNormal"><span style="font-size: 14pt;">Kirk Herander</span></div><div class="yiv4039629597MsoNormal"><span style="font-size: 14pt;">VT Solar, LLC</span></div><div class="yiv4039629597MsoNormal"><span style="font-size: 14pt;">dba Vermont Solar Engineering</span></div><div class="yiv4039629597MsoNormal"><span style="font-size: 14pt;">NABCEP<sup>TM </sup>Certified Inaugural Certificant</span></div><div class="yiv4039629597MsoNormal"><span style="font-size: 14pt;">NYSERDA-eligible Installer</span></div><div class="yiv4039629597MsoNormal"><span style="font-size: 14pt;">VT RE Incentive Program Partner</span></div><div class="yiv4039629597MsoNormal"><span style="font-size: 14pt;">802.863.1202</span></div><div class="yiv4039629597MsoNormal">
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