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Author:
Heckatall (TN)
I have a Navien tankless water heater. It has an external return recirc line installed which is approx 60 ft long 1/2 inch pex to the most distant fixture which happens to be my shower. Works great. We get hot water in about 3secs. What I want to do is tee this recirc line to another branch hot water line to the kitchen. The kitchen is closer to the tankless than the shower. Can I do this? Navien tech support advised against it because the hot water would circulate more to the closer kitchen due to less friction loss. Why wouldn't it recirculate to whichever tap was open at any particular time.
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Author:
packy (MA)
the purpose of the recirculating line is to bring hot water to a fixture when the faucet is closed..
you probably could do what you want but you have to put a balancing valve into the shorter circuit to create resistence to compensate for one being longer than the other.
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Author:
Heckatall (TN)
Being a do it yourselfer, what specifically should I ask for at the plumbing supply store? I'm using 1/2 inch pex for the additional recirc line
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Author:
hj (AZ)
You could use two valves, one on each line, and then throttle them down until both lines are the same temperature. Or, get a balancing cock which has two inlets and a single handle which opens one and closes the other until you get the proper balance. There is also an automatic one which does it by itself.
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Author:
m & m (MD)
You could simply include the kitchen into the same loop as the shower, instead of creating a second return.
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