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Old 06-14-2012, 01:56 PM   #1
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Basic Plumbing Question


So I have a 3/4" line coming in from the street, 1/2 tees off to the water heater and the 3/4" cold continues for about 20' teeing of 1/2" to fixtures, the hot is 1/2" for the 20' and also tees off to each fixture.

I am redoing a shower that is at the end of the 20' line. The valve I bought allows 3/4" lines. My question is, can I run the 3/4" cold to it and 1/2" hot to the same valve with an adapter? Will the different sizes do anything? Is it good bad or indifferent to do so? Any suggestions are welcome.

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Old 06-14-2012, 04:59 PM   #2
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Originally Posted by penlies View Post
So I have a 3/4" line coming in from the street, 1/2 tees off to the water heater and the 3/4" cold continues...

I am redoing a shower ... The valve I bought allows 3/4" lines.
Is it good bad or indifferent to do so? Any suggestions are welcome.
Not much point to using any different size pipe than what you have there now.

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Old 06-15-2012, 07:01 AM   #3
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To keep pressure and flow rates up, all lines inside the house should remain 3/4 as close as possible to the fixture, before going down to 1/2. That includes the hot side.

The feed to the heater should have been 3/4, in and out of the heater. Poor house design, or execution.
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Old 06-15-2012, 09:04 AM   #4
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Uh.... is there some reason you bought a shower valve with 3/4" inlets?


(multiple function maybe?)

So here are your options.

If you didn't buy the valve for that purpose, maybe trade it for a valve with 1/2" inlets.

If you did buy the valve for that purpose, then you DO need a 3/4" line to keep up with volume when you're using multiple functions.
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Old 06-15-2012, 06:05 PM   #5
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3/4 inlets are sized for a reason...volume....feed it with 3/4 or return it for 1/2" supply.....ben..
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Old 06-15-2012, 07:41 PM   #6
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All your fixture feeds should be 1/2". 3/4" for main lines.

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