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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;color:black'>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;color:black'> </span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>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;color:black'> </span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>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;color:black'> </span></font></p>
<p class=MsoNormal><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'>- 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>
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>
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