[RE-wrenches] SDHW and High Mains Pressure

[jay peltz]

Hi Peter,

There are some hi end units that are really nice.

Takagi, Rennai  are the two that come to mind that are really  
amazing.  They have digital remote controlls and are are designed to  
mounted outside, which saves a lot of
interior space, cost of reworking the flue etc.

Jay

Peltz power
On Dec 7, 2008, at 3:22 PM, 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
> peter.parrish at calsolareng.com
>
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