Originally Posted By: jweinberg
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http://www.nachi.org/bbsystem/usrimages/I/IMG_6188.JPG ]
[ Image: http://www.nachi.org/bbsystem/usrimages/I/IMG_6189.JPG ]
http://www.nachi.org/bbsystem/usrimages/I/IMG_6188.JPG ]
[ Image: http://www.nachi.org/bbsystem/usrimages/I/IMG_6189.JPG ]
Originally Posted By: rbennett
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Google ing the mfg says that it is a pump —DA
Need additional info -- guessing does not help
rlb
Originally Posted By: Jay Moge
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it does look like a circulator, and the thing that looks like a timer is acutualy called an “aquastat”. like a thermostat, it reads the temp. of the water and activates the circulator when needed. when temp gets to max, (indicating that the water is not being used) it shuts off the circulator. when it hits it’s min. (indicating a call for hot water) it turns it on. some aquastats have a sepetate min. max. setting, more common are the ones that have a max. setting only and a preset min. usualy 10 deg. lower. hope that helps.
Originally Posted By: jsieg
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That’s what they look like… when they require a return water line.
But, I thought thay had to be installed on the hot water line to the house, not on the return line to the tank. 
Grundfos now has one that doesn't require a return line to be installed.
This company sells them:
http://rewci.com/whhohotwaci.html
www.grundfos.com
These might help you.
Originally Posted By: Jay Moge
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| jsieg wrote: |
| That's what they look like... when they require a return water line.
But, I thought thay had to be installed on the hot water line to the house, not on the return line to the tank.  Grundfos now has one that doesn't require a return line to be installed. This company sells them: http://rewci.com/whhohotwaci.html www.grundfos.com These might help you. |
different manufacurer install differently. in acuality a circulator pump doesn't actualy "pump" but it pulls. pulling from the return causes negative pressure on supply and pulls furnace water threw.
Originally Posted By: jweinberg
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Thanks for the insight guys. I appreciate it.
Originally Posted By: John Clayton
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Yes that is a hot water circulating pump.
There does not seem to be any aquastat or timer installed with this unit unless of course they where installed remotely from the pump (unlikely). So this system would continuously be circulating hot water, very wasteful considering none of the pipes are insulated as they should be.
I can not see a check valve in the photo as there should be one in that return line to the bottom of the water heater. With out a check valve, if the pump fails or is turned off, water can be pulled from the bottom of the tank where the cold water is entering. This could cause a fixture calling for hot water to only receive tepid water.
Originally Posted By: Jay Moge
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my bad, i looked to quickly and thought the gas pilot valve as an aquastat, oooops.
