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Bob F

wrote:
On Sun, 15 Mar 2009 17:14:08 -0500, Speedy Jim
wrote:

Bert Byfield wrote:
I've got a basement full of old half-inch copper pipe, and some of
it needs to be replaced. I want to do repairs in 3/4" pipe but I'm
wondering if that will cause problems with the water changing pipe
sizes on its way to an outlet. Can I do this?

It will cause a problem if there are long runs on the Hot side.
3/4" pipe has roughly 50% more area than 1/2", meaning that
50% more volume of water has to be drawn from a distant faucet
before Hot water arrives. That may be trivial or it may be a
real pain in the neck.

That's why they sell foam pipe insulation !!!!!!

It would take a lot more than standard pipe insulation to prevent "the wait for
hot water" problem you are responding to.