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Old 02-25-2010, 12:59 AM   #1
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Recircluating Loop


I am very interested in installing a gravity fed recirculating loop. I think from what I have read I can do it very easily. I have two questions I hope someone can help answer:

1) I have two water heaters---connected in series. Do I connect the return of the loop to the first heater in the series or the second? Or, would it be better to connect the two water heaters in parallel and run the return to both of them?

2) Is it better to return the loop to the water heater on a gradual downslope (where possible), or to return it basically flat, with a vertical drop at the very end?

Thanks!

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Old 03-04-2010, 02:39 AM   #2
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Recircluating Loop


Can anyone help me with the above question?

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Old 03-04-2010, 07:13 AM   #3
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Recircluating Loop


#1 Pipe it into the bottom of the first WH (the one being fed cold water)

#2 Either way will work just try to avoid going down then up (heat trap)
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Old 03-12-2010, 01:26 AM   #4
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Recircluating Loop


Wow! I installed my recirculating system and nothing worked for a few days. Why? I didn't have it insulated. I bought some very inexpensive pipe insulation, put it on in about and hour, and went to bed. The next morning, I was excited to turn on my kitchen faucet and have very warm (not hot) water. If I drill a hole in the flapper of the check valve, will it conduct more water to make it hotter?
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Old 03-12-2010, 01:44 AM   #5
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Recircluating Loop


Quote:
Originally Posted by CKSedg View Post
Wow! I installed my recirculating system and nothing worked for a few days. Why? I didn't have it insulated. I bought some very inexpensive pipe insulation, put it on in about and hour, and went to bed. The next morning, I was excited to turn on my kitchen faucet and have very warm (not hot) water. If I drill a hole in the flapper of the check valve, will it conduct more water to make it hotter?
Is the check valve going the right direction?
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Old 03-12-2010, 01:17 PM   #6
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Recircluating Loop


Yes, I believe it's correct. It should be so water flows from the return line into the bottom of the water heater, right? What is the reason for drilling a hole in the flapper on the check valve? Should I do this? Thanks for your help.
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Old 03-12-2010, 05:39 PM   #7
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Recircluating Loop


You should'nt need check valve on return if your not running a pump. check on cold water supply would'nt hurt, but if your trying to rely on thermodynamics to circulate water the check valve on return will hurt.
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Old 03-12-2010, 05:46 PM   #8
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Yes you should drill a hole in the flapper.

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