mixing valves on SHW systems with gas backup [RE-wrenches]

[Karl Schwingel]

Davis, 

What I've heard is that you run the risk of tripping the overthermal
protection in the gas water heater if you should on a hot summer day run 190
deg water into the bottom of the tank.  Of course you don't realize it till
months or weeks later when there's no solar preheated water and you get the
call that "my water heater doesn't work" 

I've never put a mixing valve on the preheat tank, and have only seen it
done when you want to keep the tank at a high temp (such as when you're
pulling water off for a space heat loop.  However, I'm working mostly around
electric water heaters. 

Is this forum open to thermal questions too? All I've seen so far has been
PV related. 

Karl Schwingel
Nabcep Certified Thermal Installer

NorthWind Renewable Energy
Karl at northwindrenewable.com
PO box 723, 
Stevens Point Wi.
54481
cell: 715 209 0446





-----Original Message-----
From: Davis Terrell [mailto:davis at brightearthsolar.com] 
Sent: Saturday, May 10, 2008 12:28 AM
To: RE-wrenches
Subject: mixing valves on SHW systems with gas backup [RE-wrenches]


Wrenches,

I have seen some literature call for a mixing valve in between the solar 
storage tank and the gas hot water tank.  Can anyone give some ideas as 
to why this second mixing valve may be necessary?  Does anyone else use 
one?  Thanks.

-- 
Davis Terrell
Bright Earth Solar
(802) 492-2273 / brightearthsolar.com


- - - -
Hosted by Home Power magazine

To send a message: RE-wrenches at topica.com

Archive of previous messages: http://lists.topica.com/lists/RE-wrenches/read

List rules & how to change your email address:
www.mrsharkey.com/wrenches/etiquette.php

Check out participant bios: www.mrsharkey.com/wrenches/

Moderator: michael.welch at homepower.com




-- 
No virus found in this incoming message.
Checked by AVG Free Edition. 
Version: 7.5.516 / Virus Database: 269.23.9/1418 - Release Date: 5/6/2008
5:17 PM


- - - -
Hosted by Home Power magazine

To send a message: RE-wrenches at topica.com

Archive of previous messages: http://lists.topica.com/lists/RE-wrenches/read

List rules & how to change your email address: www.mrsharkey.com/wrenches/etiquette.php

Check out participant bios: www.mrsharkey.com/wrenches/

Moderator: michael.welch at homepower.com
--^----------------------------------------------------------------
This email was sent to: michael.welch at re-wrenches.org

EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9.bWljaGFl
Or send an email to: RE-wrenches-unsubscribe at topica.com

For Topica's complete suite of email marketing solutions visit:
http://www.topica.com/?p=TEXFOOTER
--^----------------------------------------------------------------