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Old 12-25-2009, 09:13 AM   #1
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Galvanized steel to PEX sizing issue


Hello all,
I am starting to replace all my steel pipe with PEX as I finish my basement. I thought I would bring 3/4" PEX from the main (it is 3/4" galvanized currently), but I now see that the two are not the same, and that the PEX 3/4" tube is considerably smaller than the steel.

Will that affect my water pressure and current? Should I bump it up to 1" PEX before the hot water heater?

Thanks!

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Old 12-25-2009, 01:37 PM   #2
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Galvanized steel to PEX sizing issue


It would depend on your water demand.Are you using the brass insert or push in gator grip?The inserts reduce the flow to about 1/2" where the gator grips with a stiffener insert down to about 5/8". Most house water meters are only 5/8".You could do home runs where each fixtures has a separate H&C pipe coming from a header.You get hot water faster since it's not sitting in a long main cooling off and you get equal flow and pressure.
Hope this helps!

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Old 12-25-2009, 07:08 PM   #3
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Galvanized steel to PEX sizing issue


Quote:
Originally Posted by rudolph58 View Post
It would depend on your water demand.Are you using the brass insert or push in gator grip?The inserts reduce the flow to about 1/2" where the gator grips with a stiffener insert down to about 5/8". Most house water meters are only 5/8".You could do home runs where each fixtures has a separate H&C pipe coming from a header.You get hot water faster since it's not sitting in a long main cooling off and you get equal flow and pressure.
Hope this helps!

Thanks. I was going to use the brass inserts (with the crimping tool) but I guess I can use the push-in gator grip connectors before the water heater since that will likely take half the flow. I'm not too familiar with these- are they the plastic connectors that do not require crimping but are only a little more expensive?
I do plan to run a manifold for the hot and cold water after the water heater.

Thanks!
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Old 12-26-2009, 01:31 AM   #4
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Galvanized steel to PEX sizing issue


Yes,they are more expensive but a crimp tool for the bands is around $90
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Old 12-27-2009, 12:37 PM   #5
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Galvanized steel to PEX sizing issue


Assuming the galvanized pipe is old, it's probably been choked way down over the years due to scale/barnacles on the inside of the pipe.

I've cut some 1" galv. pipe that's been choked down to the diameter of a pencil.

So, if that's the case, replacing with 3/4" PEX will only show an improvement.
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