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Old 12-05-2008, 11:52 AM   #1
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1/2 copper pipe "l" or "m"


Which kind of pipe is used for hot/cold water supply? I happen to have a lot of the red (which I believe is "m"), left over from another project. Not sure it matters, but I am in PA.

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Old 12-05-2008, 12:17 PM   #2
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1/2 copper pipe "l" or "m"


Red is the color coding for type M copper. This is the thinnest type and is normally used inside the home. Type L is colored blue and can be used inside or out. Type K is green and the thickest type for water lines and is generally used for water mains and underground use. Unless your local Code calls for another type, M should be no problem.

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Old 12-05-2008, 03:51 PM   #3
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1/2 copper pipe "l" or "m"


I thought it was everywhere, but here only type "L" (blue) copper can be used for domestic water and "M" only allowed in a houses heating system.

Last edited by Piedmont; 12-05-2008 at 03:55 PM.
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Old 12-05-2008, 06:35 PM   #4
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1/2 copper pipe "l" or "m"


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Originally Posted by Piedmont View Post
I thought it was everywhere, but here only type "L" (blue) copper can be used for domestic water and "M" only allowed in a houses heating system.
I'd question that since it's common to see 1/2 inch Type M copper pipe for sale in home centers, but I have yet to see a hot water heating system that uses 1/2 inch copper pipe. So far as I know, hot water heating systems will typically use 3/4 inch piping (copper or iron).

My understanding is that Type M is used for both hot and cold water supply piping in residential buildings (houses) whereas Type L is used for hot and cold water supply piping in commercial buildings (including apartment blocks). I know that ALL of the 60 year old copper piping I take out of my apartment block is Type L. From what I know, Type M can be used for hot water heating systems in both residential and commercial buildings.

Last edited by Nestor_Kelebay; 12-05-2008 at 06:39 PM.
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