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Old 01-18-2010, 01:12 PM   #1
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Recirculating hot water


I just replaced my son's 50 gal natural gas hot water heater. I thought it would be a cinch until I realized the previous hwh had another copper line(1/2') running from the lower water valve (clean out). As I had never seen this type of installation and after asking many questions I learned this additional line was a gravity hot water return line used to assist in delivering faster hot water in a master bath addition.
My problem now is the hot water to the master bath takes a long time to heat since the new hwh was installed. I tried to hookup system exactly like the old one. I even installed a new check valve and lever turn off. Is there a way I can verify my installation process? HELP?

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Old 01-18-2010, 06:07 PM   #2
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Recirculating hot water


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Originally Posted by jerryj View Post
I just replaced my son's 50 gal natural gas hot water heater. I thought it would be a cinch until I realized the previous hwh had another copper line(1/2') running from the lower water valve (clean out). As I had never seen this type of installation and after asking many questions I learned this additional line was a gravity hot water return line used to assist in delivering faster hot water in a master bath addition.
My problem now is the hot water to the master bath takes a long time to heat since the new hwh was installed. I tried to hookup system exactly like the old one. I even installed a new check valve and lever turn off. Is there a way I can verify my installation process? HELP?
What kind of check valve did you put in (e.g. - spring?/swing?) Is/was there a circulator (pump) on that line?

If the recirc was operating on convection alone, a spring-check would be too much resistance and the water will not circulate without a pump.

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Old 01-18-2010, 08:32 PM   #3
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Recirculating hot water


I believe the check valve was a swing type. I also drilled a 1/8" hole in it to assist with flow.
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