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Old 07-21-2013, 08:43 AM   #1
magnum68
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Default Water Heater Pipe Question

Hi everyone, I'm new here and I am planning on having my water heater replaced. The top of my WH has the Hot & Cold water pipes and the high pressure relief valve. But at the bottom there is another pipe which I have no clue what it is. I don't plan on replacing this myself but would like to know what that extra line is for. Any and all help will be greatly appreciated.
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Old 07-21-2013, 01:21 PM   #2
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The extra pipe looks like a recirculation line for the hot water. It may be operating by gravity/convection, since there is no visible pump. When the tank is replaced, be sure to put a check valve on the recirc line unless one already exists under the insulation.



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Old 07-21-2013, 04:49 PM   #3
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Quote:
Originally Posted by Caduceus View Post
The extra pipe looks like a recirculation line for the hot water. It may be operating by gravity/convection, since there is no visible pump. When the tank is replaced, be sure to put a check valve on the recirc line unless one already exists under the insulation.
Thanks for the reply. What would happen if I don't have that extra pipe installed on my new water heater?
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Old 07-21-2013, 05:57 PM   #4
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If you have a heat pump with recovery heat there is a good chance the piping could be going to it. Check to see if you have 1/2'' piping outside at the heat pump or maybe a recovery box attach to the house by the heat pump.

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Old 07-21-2013, 06:07 PM   #5
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Quote:
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If you have a heat pump with recovery heat there is a good chance the piping could be going to it. Check to see if you have 1/2'' piping outside at the heat pump or maybe a recovery box attach to the house by the heat pump.
Hi, if there is a heat pump it's nowhere to be found unless it's behind the wall. I'm just curious if that line needs to be connected to the new water heater I plan to have installed. What I did for the moment was that I turned off that line using the water valve wheel and really saw no difference in water temperature or pressure. I just don't want that extra line connected to my new water heater if I really don't need it.
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Old 07-21-2013, 06:08 PM   #6
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The heat pump is the unit outside that helps heat & cools the house

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Old 07-21-2013, 06:12 PM   #7
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If the lines are connected to a heat pump recovery and the recovery is in uses then the lines should be reconnected.

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Old 07-21-2013, 06:14 PM   #8
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Quote:
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The heat pump is the unit outside that helps heat & cools the house
The only thing I have outside is the AC Compressor. I live in Florida, don't know if that makes a difference about the heat fan.
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Old 07-21-2013, 06:14 PM   #9
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IFIXH2O is correct that is from a heat recovery unit. At first glance I failed to see the other line on the top of the heater.

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Old 07-21-2013, 06:22 PM   #10
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I removed the insulation so you guys can have a better view of the line.



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