On Sat, 15 May 2010 19:01:56 -0500, "
> wrote:

>On Sat, 15 May 2010 15:54:20 -0700, Oren > wrote:
>
>>On Sat, 15 May 2010 16:57:59 -0500, "
> wrote:
>>
>>>>If the pipes are insulated, they don't lose that much in one run. Heating water
>>>>with gas here cost about half what letting the dishwasher heat it electrically
>>>>costs.
>>>
>>>Few pipes are insulated, and even fewer in walls. All pipes, no matter how
>>>much insulation, will lose the heat in the entire run each cycle.
>>
>>I have a PEX manifold system. When hot is demanded, the cold is sent
>>back to the water heater. I get hot water faster that way. Granted all
>>systems are insulated....
>
>I have a PEX manifold system, too, but see no way of sending cold water back.
>How's that work? You have a bypass at each faucet?

I'm not expert. I'm not sure of the word that would describe my PEX
manifold (not looking at my *.PDF). There is a loop H/C at the top. I
wish I knew the exact wording, but I know cold water is looped back to
the heater, when hot is demanded.

Gosh that "word" escapes me now.