Rattling Pipes On 2nd Floor Bath ONLY When HOT Water On. Plumber Wants $600 - Plumbing - DIY Home Improvement | DIYChatroom
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Old 05-12-2015, 07:33 PM   #16
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May i suggest we stop with the rooter plumbers.
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Old 03-15-2017, 02:45 PM   #17
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Re: Rattling pipes on 2nd floor Bath ONLY when HOT water on. Plumber wants $600


Hello guys!!

I know this thread is old, but the issue is the same and so I thought I resurrect this post instead of a new one.

The issue with the rattling was resolved after I contacted Metro Water (city) and they came and changed the meter outside back in May 2015.

Now almost 2 yrs later, the Hot water rattling on the 2nd floor tub came back.

I contacted another plumber and they measured the PSI at the garden hose to be 110. They again (different Plumber) suggested a pressure releasing valve and expansion tank. I understand this since they can't touch the city meter or fiddle with it.

So I called Metro Water (the city) and they came and said pressure was normal? They did not check PSI levels apparently since it was at 110psi just this past Saturday and the pipes continue to rattle today (only hot water 2nd floor shower).

Please bear with me.

I'd like to understand why does the high pressure coming into the house make ONLY the hot water pipes rattle and ONLY on the second floor shower?
I would imagine a high psi would make more than just the hot water pipes on the second floor rattle. Any ideas?

Also, when they replaced the meter back in 2015 they did not add a PRV or anything to regulate the pressure coming in, it was just the water meter that was replaced and that FIXED the issue and there was no more rattling on the pipes after that.
So, I am not sure how just changing the water meter fixed the hot water rattling if pressure continued to be high.

I'd appreciate if someone can explain these 2 things to me.

I am going to have to pay for the PRV valve it seems, which apparently must be installed with an expansion tank at the water heater too or I risk a rupture? Is this more of a myth or necessity for the expansion tank?

Thanks for any insight
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Old 03-15-2017, 04:18 PM   #18
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Re: Rattling pipes on 2nd floor Bath ONLY when HOT water on. Plumber wants $600


The code I work with (UPC) dictates max. water pressure of 80psi. Your water company is not governed by plumbing codes the same way a plumber is. So, IMO, when they say the pressure is fine, they mean only that it works.
Once a PRV or check valve(some newer meters have them) is installed you have created a closed system. This means water pressure will increase in your home as you heat it. So an expansion tank is needed.



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Old 03-15-2017, 05:42 PM   #19
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Re: Rattling pipes on 2nd floor Bath ONLY when HOT water on. Plumber wants $600


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The code I work with (UPC) dictates max. water pressure of 80psi. Your water company is not governed by plumbing codes the same way a plumber is. So, IMO, when they say the pressure is fine, they mean only that it works.
Once a PRV or check valve(some newer meters have them) is installed you have created a closed system. This means water pressure will increase in your home as you heat it. So an expansion tank is needed.



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THanks for your insight.

I wonder then, why did the new meter fixed the rattling problem in 2015, assuming the new meter does not have a check valve or any way to regulate the pressure coming in? I assume it doesn't have a regulator since they did not mention that the new meter could be adjusted today when they went to check on the pressure.
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Old 03-18-2017, 11:24 AM   #20
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Re: Rattling pipes on 2nd floor Bath ONLY when HOT water on. Plumber wants $600


I spoke with an engineer at Metro water and he suggested that "electric" water heater tanks do not "need" an expansion tank when installing a PRV valve. He said gas water heater tanks do, but not electric one.s since the heating process is faster on a gas powered one. He agreed that plumbers recommend expansion tanks sometimes to apiece the warranty on the tanks as required by the manufacturers.

Does this sound correct, it would save me money to only install a PRV. Thoughts?
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Old 03-18-2017, 03:54 PM   #21
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Re: Rattling pipes on 2nd floor Bath ONLY when HOT water on. Plumber wants $600


So install a P R V first, and wait a few days to see if the rattling stops, and don't come back.

If so GRIN and be glad that you saved $$, if it returns then have an expansion tank installed.

I'm still not convinced that all your plumbing is attached solid, Have you inspected it all?


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Old 03-19-2017, 06:20 PM   #22
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Re: Rattling pipes on 2nd floor Bath ONLY when HOT water on. Plumber wants $600


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Originally Posted by Tnguy View Post
I spoke with an engineer at Metro water and he suggested that "electric" water heater tanks do not "need" an expansion tank when installing a PRV valve. He said gas water heater tanks do, but not electric one.s since the heating process is faster on a gas powered one. He agreed that plumbers recommend expansion tanks sometimes to apiece the warranty on the tanks as required by the manufacturers.

Does this sound correct, it would save me money to only install a PRV. Thoughts?
The guy is wrong. If you install a PRV you must install a hot water expansion control device. It matters not if the tank is gas or electric. Now the why.

Hot water as most things that get hot expands. If that hot water doesn't have anywhere to go like a leak on a hot faucet or back to the water main then it will cause your hot water tank temperature relief to drip.

Most PRV do have a small bypass back to the main to avoid trapping the hot water expansion. Problem is if a derbie from say hydrant flushing lodges in that bypass then your back to the T&P relief valve spitting water. So most if not all plumbing codes require a hot water expansion control device.
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