Dean,
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). 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)? - Peter Peter T. Parrish, Ph.D., President California Solar Engineering, Inc. 820 Cynthia Ave., Los Angeles, CA 90065 Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 CA Lic. 854779, NABCEP Cert. 031806-26 [EMAIL PROTECTED] _____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dean T. Newberry Sent: Sunday, December 07, 2008 4:18 PM To: RE-wrenches Subject: Re: [RE-wrenches] SDHW and High Mains Pressure Hello Peter, You want a Watts Regulator. Here's the link: http://www.watts.com/pro/_products_sub.asp?catId=64 <http://www.watts.com/pro/_products_sub.asp?catId=64&parCat=285> &parCat=285 Good Luck Peter Parrish wrote: 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. 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? Are there products that will prevent system pressures from exceeding a set point (e.g. 60 psi) under any flow condition including zero? - Peter Peter T. Parrish, President California Solar Engineering, Inc. 820 Cynthia Ave., Los Angeles, CA 90065 Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 CA Lic. 854779, NABCEP Cert. 031806-26 [EMAIL PROTECTED] _____ _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org -- Dean T. Newberry Talbott Solar & Radiant Homes Inc. 430 D Street Davis, CA 95616 T: 530 219-3606 F: 530 758-8187 E: [EMAIL PROTECTED] W: http://www.TalbottSolar.com/ http://www.TalbottRadiant.com/
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