Buildup Around Mixing Valve

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Old 03-15-20, 09:14 AM
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Buildup Around Mixing Valve

Hi, I started having an issue with hot water so I went to check the water heater and noticed a buildup at the mixing valve connection. Also water is dripping at the connection. Please see picture below:

 
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Old 03-15-20, 09:20 AM
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The buildup is the minerals in the water, probably after months/years of a slow drip, then the water evaporating off and leaving the minerals behind. The buildup isn't really much of an issue, but obviously the drip is.

You'll have to clean it off, turn off any valves nearby, and open up that connection. I'm not sure what type of connection that is, whether it needs teflon tape and/or pipe dope, or has a washer inside to make the seal. It looks from the wrench marks that someone may have tried to over-tighten it, or maybe try to tighten it more when it wouldn't stop dripping. Hard to say.
 
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Old 03-15-20, 09:25 AM
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Thank you very much. Is this possibly the reason for the hot water issue as well?
 
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Old 03-15-20, 09:58 AM
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It looks like there may be rubber washers in those fittings. If you look in the following link at a similarly connected valve.... they use a male union fitting.

Mixing valve (pdf)

You didn't mention what type of hot water problem you are having.

 
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Old 03-15-20, 10:20 AM
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Thank you for the link. Sorry if I didnít clarify the issue. While hot water was running it started to turn lukewarm. We thought itís impossible that the hot water simply ran out so I went to the tank to check and noticed the mixing valve.
 
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Old 03-15-20, 10:56 AM
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It could be the valve or it could be reduced hot water from the heater.
That leaking valve did a number to that water heater.

How old is the water heater ?
Gas or electric ?
 
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Old 03-17-20, 02:55 PM
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Thanks again. It is gas and about 5 years old.
 
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