01:53PM | 10/19/04
Member Since: 09/25/04
6 lifetime posts

I noticed something by accident today and wonder if something is wrong. I put the hot water on (just the hot) in the bathroom sink and let it run. Then I started the hot water in the tub (just the hot) and the water pressure in the sink immediately became very, very low. Is this normal? And, if not, what could be causing this?




05:01PM | 10/19/04
A drop in water pressure is not normal. Usually this means you still have steel pipes that have closed off inside. The broader characterization is that you have inadequate volume to supply the demand. This could be a restriction at the water heater, a valve that is not all the way open or an undersized line supplying the heater.

What kind of pipe do you have? Is it gray steel, copper, white or other color of soft or hard plastic?


07:06AM | 10/20/04
Member Since: 09/25/04
6 lifetime posts
Hi LonnythePlumber,

Thanks for your reply. I am not an expert at plumbing so I will try to describe the pipes as best as I can. The pipe coming into the house is dark steel but it branches into copper pipe before it enters the water heater. The hot side of the water heater is copper pipe all the way to the bathroom. I checked the water main and the know was able to be turned to all the way open---I guess the question is if the valve is actually working. Most of the pipes in the house are 40 years old but the line from the water heater to the bathroom is only about 10 years old. Thanks,



06:48AM | 10/21/04
Very good description. I understand that you still have a steel water service and pipe running to the heater but copper thereafter. Steel pipe closes off inside to where you can't even see through it. Steel to your water heater is causing you to have inadequate volume for two hot faucets. I'm sure your water meter valve is on but how is your valve on the cold line going into the water heater? Does it have a wheel handle or a lever? If your cold water showed a drop in pressure from multiple uses then that would indicate the water service. If your cold does not drop then it is the inside piping to the heater that also needs to be replaced with copper.


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