Whistling sound from tankless heater

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CliffG

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Joined
Jan 20, 2015
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Location
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Hello,

Lately I have been hearing a whistling type noise which I believe is coming from my tankless water heater. It only happens after I turn off one of my water faucets. and it happens often. I can hear it from the other end of my house, so it's pretty loud. The tankless heater has only been installed for about 3 months and I don't recall it happening when it was initially installed. I've done a little research and I think it may be TPR valve. Has anyone ran into this type of issue? Should I be concerned?

Thanks for your response!
 

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