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<div class=Section1>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'>Dean,</span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'>Thanks for the info on the tankless water heater. However,
when I looked up the specs on the Watts regulator, I found the same behavior:
zero pressure drop at zero flow. So the Watts regulator will not solve the
problem of high water pressure at night (when there is zero or very little
flow). </span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'>Anyone else know of a control unit that can limit the
water pressure (to say 60 psi) on the customer side under all flow conditions
(including zero)?</span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'>- Peter</span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<div>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Peter T. Parrish, Ph.D., President<br>
California Solar Engineering, Inc.<br>
820 Cynthia Ave., Los Angeles, CA 90065<br>
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885<br>
CA Lic. 854779, NABCEP Cert. 031806-26<br>
peter.parrish@calsolareng.com</span></font><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'> </span></font></p>
</div>
<div>
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color=black face="Times New Roman"><span style='font-size:12.0pt;color:windowtext'>
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</span></font></div>
<p class=MsoNormal><b><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:windowtext;font-weight:bold'>From:</span></font></b><font
size=2 color=black face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;
color:windowtext'> re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Dean T. Newberry<br>
<b><span style='font-weight:bold'>Sent:</span></b> Sunday, December 07, 2008
4:18 PM<br>
<b><span style='font-weight:bold'>To:</span></b> RE-wrenches<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [RE-wrenches] SDHW
and High Mains Pressure</span></font></p>
</div>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'>Hello Peter,<br>
You want a Watts Regulator.<br>
<br>
Here's the link: <a
href="http://www.watts.com/pro/_products_sub.asp?catId=64&parCat=285">http://www.watts.com/pro/_products_sub.asp?catId=64&parCat=285</a>
<br>
<br>
Good Luck<br>
<br>
Peter Parrish wrote: </span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'>We are getting ready to install a SDHW system for a
customer and we looked at a number of things regarding his current set up. I
just posted a question about tankless heaters but I wanted this query to be a
separate one. The customer’s mains water pressure is 88 psi on a Saturday
afternoon and some time over the next 18 hours, the pressure went as high as 96
psi. I understand that 80 psi is the high end of the safe range in general and
that 96 psi on a regular basis can/will damage valves and possibly trigger
T&P valves on water heaters.</span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'>At the recommendation of a plumber I know I looked
into pressure reducers, specifically the Wilkins/Zurn line. All the Wilkins
regulators produce zero pressure drop at zero flow. What good are these
products in protecting plumbing systems from high mains pressures at night when
pressures tend to be the highest and usage is at a minimum or even zero?</span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'>Are there products that will prevent system pressures
from exceeding a set point (e.g. 60 psi) under any flow condition including
zero? </span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'>- Peter</span></font></p>
<div>
<p><font size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:navy'>Peter T. Parrish, President<br>
California Solar Engineering, Inc.<br>
820 Cynthia Ave., Los Angeles, CA 90065<br>
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885<br>
CA Lic. 854779, NABCEP Cert. 031806-26<br>
<a href="mailto:peter.parrish@calsolareng.com">peter.parrish@calsolareng.com</a></span></font><font
size=2 color=blue face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:blue'> </span></font></p>
</div>
<pre wrap=""><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt'> </span></font></pre><pre style='text-align:center'><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>
<hr size=4 width="90%" align=center>
</span></font></pre><pre><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt'> </span></font></pre><pre><font size=2
color=black face="Courier New"><span style='font-size:10.0pt'>_______________________________________________</span></font></pre><pre><font
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<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt'><br>
<br>
</span></font></p>
<pre><font size=2 color=black face="Courier New"><span style='font-size:10.0pt'>-- </span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>Dean T. Newberry</span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>Talbott Solar & Radiant Homes Inc.</span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>430 D Street</span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>Davis, CA 95616</span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'> </span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>T: 530 219-3606</span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>F: 530 758-8187</span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>E: <a
href="mailto:deant@talbottsolar.com">deant@talbottsolar.com</a></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'>W: <a
href="http://www.TalbottSolar.com/">http://www.TalbottSolar.com/</a></span></font></pre><pre><font
size=2 color=black face="Courier New"><span style='font-size:10.0pt'> <a
href="http://www.TalbottRadiant.com/">http://www.TalbottRadiant.com/</a></span></font></pre></div>
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