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Old 07-15-2013, 07:51 PM   #1
DIYmnmom
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Default Warm not hot water

I am unable to get hot water out of all of the faucets in my house except for the kitchen sink. That faucet is closest to the hot water heater and produces hot water. The other sinks, showers, will only put out warm water when set fully to hot. Thought it was a bad element and replaced both, but it did not resolve the issue. Any ideas? Could this be a dip tube issue?



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Old 07-15-2013, 09:30 PM   #2
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Sounds like a cross connection between the hot and cold. The two most likely causes are a bad check valve on a recurlating system or a failed cartridge in a tub or shower faucet.



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Old 07-16-2013, 12:33 AM   #3
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Could a failed cartridge affect the water temp. coming from other faucets, or only the faucet it is installed in?

Also, I have a circulation pump connected to the hot water heater that can be unplugged. If the valve on the pump is the problem would unplugging resolve the issue? I know I would have to let the water run longer to get hot water out of further away faucets.

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Old 07-16-2013, 12:55 AM   #4
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A single handle cartridge can allow cold water to mix with hot water to all of the other fixtures in the house. If the check valve on the recirculating system is bad, you would have to shut off valves on the recirc line to resolve the problem. Better yet, have the check valve replaced.

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Old 07-23-2013, 01:57 AM   #5
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I determined by Grundfos circulation pump needed to be replaced. I found a different Grundfos model to replace it with that has a check valve in it. The new pump has an arrow for direction of flow and the old pump did not. How do I know which way to put the arrow? Should it point away from the hot water heater or towards it?

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Old 07-23-2013, 02:19 AM   #6
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It should point away if I remember correctly.

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Old 07-23-2013, 02:49 AM   #7
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I have never seen a circulator pump with a check valve built in. The arrow is just for the direction of flow. You also need a check valve.

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Old 10-06-2013, 10:51 AM   #8
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Quote:
Originally Posted by johnjh2o View Post
I have never seen a circulator pump with a check valve built in. The arrow is just for the direction of flow. You also need a check valve.
The arrow denotes flow because the impeller will only produce flow one way therefore making it somewhat of a built in check valve. My opinion arrow should point towards tank to constantly force water thru system.
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Old 10-06-2013, 10:54 AM   #9
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Quote:
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The arrow denotes flow because the impeller will only produce flow one way therefore making it somewhat of a built in check valve. My opinion arrow should point towards tank to constantly force water thru system.
Do you have any Y type adapters anywhere. Cross connection is a great guess. Where on tank is pump? At bottom where OEM boiler drain would. Be
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Old 10-06-2013, 11:22 AM   #10
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Quote:
Originally Posted by robmcg View Post
The arrow denotes flow because the impeller will only produce flow one way therefore making it somewhat of a built in check valve. My opinion arrow should point towards tank to constantly force water thru system.
There is no way that the impeller acts as a check valve.


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