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penlies 06-14-2012 02:56 PM

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.

TarheelTerp 06-14-2012 05:59 PM

Quote:

Originally Posted by penlies (Post 943422)
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.

Just Bill 06-15-2012 08:01 AM

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.

Alan 06-15-2012 10:04 AM

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.

ben's plumbing 06-15-2012 07:05 PM

3/4 inlets are sized for a reason...volume....feed it with 3/4 or return it for 1/2" supply.....ben..:yes:

JetSwet 06-15-2012 08:41 PM

All your fixture feeds should be 1/2". 3/4" for main lines.


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