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Old 02-27-2012, 05:28 PM   #1
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Correct pipe size on hot water heater


Should the hot and cold water lines coming from the top of the water heater be both 3/4" if the pipe on the cold side is 1/2 can this reduce water pressure?

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Old 02-27-2012, 05:46 PM   #2
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Correct pipe size on hot water heater


They are typically 3/4" on both sides----a very small house might have 1/2" but I have never seen that.

Yes the water pressure will be affected.

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Old 02-27-2012, 05:53 PM   #3
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Correct pipe size on hot water heater


It will lower the pressure as much as 25%. Huge diffearance in volume between 1/2 and 3/4".
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Old 02-27-2012, 06:26 PM   #4
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Correct pipe size on hot water heater


What size line is coming into the house? 1/2 or 3/4"?
If 3/4", consider changing the whole supply line to the tank to 3/4".

Last edited by how; 02-27-2012 at 06:29 PM.
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Old 02-27-2012, 07:48 PM   #5
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Correct pipe size on hot water heater


yes how is right ....if inlet pipe is 3/4 don't consider changing it....DO IT....
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Old 02-27-2012, 08:13 PM   #6
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Correct pipe size on hot water heater


I think I found the problem,There is a 3/4 pipe transiioning to 3/pex. Then there is a T 3/4 PEX goes into the floor I am assuming to supply the house then the other end of the T is 1/2 which goes to the washer.

Looking closer I then found a 1/2" PEX line coming up through the floor connecting to copper then into the cold side of the hot water heater.

This is the cause of my low water pressure correct? And now I have to find what is coming into the house.

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