piping new bath

Ken_8

The street (or well) pressure is under 30 # and the house has the up-upstairs bath 30 feet above grade (:-o)

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D lux_2

bath room 15 year project

Need some advice I have ruffed in new bathroom 2nd floor tub shower W/C toto and sink . I ran 3/4 copper Hot And cold with a hot water ½ return water tanks 50 / 60 feet away . I only stubbed to basement . ran a separate 1’’ to W/C thought about commercial flush to save room and quick fill but have changed mind and going with a toto one piece . Have a 3/4 service line 58 psig . I was thinking about installing a rinnai near the bath runs 1st floor and 2nd close to each other wouldn’t need to run return back to HWT. Rinnai wants ¾ to feed . My main question would I gain anything if I ran a 1'' feed to the bath rooms and rinnai or would 3/4 be ok 1’’ run would be 35 feet 4 to 5 ells.Service line 3/4 THANKS

gerry gill

since your service line

is 3/4'' you wont really gain anything by running the 1'' pipe except a lower friction loss, which probably isn't much in a house anyhow..

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Robert O'Connor_12

D lux

If you are only feeding two fixtures with hot water, I'd reduce it to 1/2" unless your shower valve either calls for 3/4" in the manufacturers specs, or you have multible body sprays. You don't need 1" in a domestic residential application.

Robert O'Connor/NJ

jeff_51

if you have three fixtures in the same room

you only need half inch. unless of course as has been previously stated the t&s valve has 3/4 tie ins. Using bigger lines just means you have to move more water to get hot water to the sight. Yes yo are using a recirc, but over sizing is just as wrong as undersizing. In a residence we do now use one inch to where the water heater cold inlet tees off, but in most applications that is all you should need.