pipe sizes.


Old 02-19-02, 10:07 AM
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pipe sizes.

the water pipes in my house looks like this..
cold water it's 3/4" and hot water it's 1/2"
it's this normal? and why?

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Old 02-19-02, 10:46 AM
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A typical water supply from the street is 3/4"...from there it tees into 1/2" to supply the hot water tank and 1/2" to supply the cold water (3/4" X 1/2" x 1/2" tee).

If your whole house is supplied with 3/4" cold water piping, it is a custom job by someone who thought it would make a difference.
It really is a waste as most faucets reduce to 3/8" or even 1/4" internally. There is nothing to be gained.
Old 02-19-02, 11:16 AM
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It is an overkill on the 3/4" for cold water. I have plumbed houses during the 70s when energy was such a concern and used 3/8" copper for the hot water. You don't have to run the water for as long to get hot at the faucet and there is less wasted hot water left in the pipe.
Old 02-21-02, 09:56 AM
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Thanks for the info. and keep up the good work!!
Old 02-21-02, 06:53 PM
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Location: Long Beach, California
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I guess we do things a little different here in So Cal
Typically we use 1"or 1 1/4" service to the house with a 3/4 branch for sprinklers. All horizontals "Hot and Cold" are 3/4" with 1/2" risers. All angle stop valves are 1/2" comp. 2 or even 3 showers at the same time and flushing the toilet are no problem, although it took my wife (she's from Long Island) some time to get used to that.

ps: We use a "Grund-fos" circulating pump to get almost instant hot water at the furthest fixture.
Old 02-21-02, 07:00 PM
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Hot water recirc in a house...sweet

I wish we got 1" service here in Canada...
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