copper pipe

Capt.Dan

What type of copper pipe should I be purchasing for my heating connections?, type M or L and can you tell me the differences? Thank-you. CaptDan

Wild Bill

Copper tube

Hello,

"M" wall copper tube has a thinner wall thickness than "L" wall copper. I believe the entire country allows "M" wall for heating. However, some people prefer to use L for several considerations. For example, noise reduction, not as "spaghetti like" more resistant to aggressive water conditions. For the small price differeence, I would "go to L".
Bill

jackchips_2

Ten hut!

I have never seen a problem with M on a FHW heating system but that is only here in the great Commonwealth of Mass.

Others will give you feed back for their sections of the country and world.

E4 Jack

MA National Guard

Weezbo

Mor L

i use both...M mostly L for looks or where freezing on a "down" system might be a bit of a bad itch to get back into.L is able to take more freezings. 80 K for under grounds ,yellow for DWV,then there are special pipes used in science experimentations where electrical wire doesnt get it.

STEVEN MARKS

M for heat
L for domestic water
A lot of companies only use L so that plumbers dont mistakenly use M on water lines

Brad White_2

Call me conservative

but I use L on all FHW and domestic water piping both installed in my house and as a specifying engineer. Type M just has that thin feel to it and can kink and dent if you are threading it into a tight space. Subjective I know. But once bought, it goes forever. Just MHO...

ScottMP

Brad

Twenty Five years in the trade and I have never used anything but M on Hydronics. Never a problem.

We did go thru a problem where some contractors were using M for water piping and it pitted right thru after about ten years. Massachusettes code is now L only for domestic water, but we still use M on heating systems. Allthough now its more pex-al-pex than anything.

Scott

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