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Old 06-24-2020, 01:13 AM   #1
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Default Navien tankless

I installed a Navien tankless water heater with a comfort valve at the kitchen faucet which is the furthest fixture for instant hot water. There’s no dedicated recirculating line. Now the master bathroom sink is putting out a lot of hot water on the cold side. I’m thinking the master bathroom shower valve cartridge is failed. It’s a Hansgrohe thermostatic cartridge and it controls shower head, body sprays, and hand wand. I’ll be checking that cartridge tomorrow. Anything else I should look for?

There’s no other pressure balancing cartridges in the house
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Old 06-24-2020, 02:20 AM   #2
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Do you have the four pages of Technical bulletins for the Grundfos Comfort Valve with NPE models? I can scan them and send if you contact me, but Navien will send to you if you call them, of course.
There are dip switch, paramaters and required piping layout incl external check valve and addition of expansion tank.
One part in my experience has been a hang up: The internal check valve after a year or so, in dedicated recirc conditions, can hang up, causing warm/hot effects on the cold side fixtures. Quick swap with replacement solves it every time. But that is over time with chloramine being the suspect cause of o-ring deterioration in that spring check.
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Old 06-24-2020, 12:29 PM   #3
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the hot water has to go somewhere. thats the problem with not having a recirc pipe.
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Old 06-24-2020, 10:52 PM   #4
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How old is the install? You might want to have a spare one of those bypass blocks with you just in case the one there now is bad. Remember this thread https://www.plumbingzone.com/f7/grun...-system-51305/
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Old 06-24-2020, 11:30 PM   #5
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Thank you guys for the insight. It wasn’t the Hansgrohe thermostatic cartridge, it was the old Moen cartridge in the upstairs bathroom causing the crossover. It put up a bit of a fight getting it out.
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