keith wrote:
> On May 17, 1:04 am, "Bob F" > wrote:
>> wrote:
>>> On Sun, 16 May 2010 17:07:29 -0700, "Bob F" >
>>> wrote:
>>
>>>> wrote:
>>>>> On Sat, 15 May 2010 22:42:56 -0500, (Gary
>>>>> Heston) wrote:
>>
>>>>>> In article >,
>>>>>> > wrote:
>>>>>>> On Sat, 15 May 2010 17:47:19 -0700, Oren > wrote:
>>>>>> [ ... ]
>>>>>>>> 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.
>>
>>>>>>> If you can find a reference for this I'd appreciate it.
>>
>>>>>>>> Gosh that "word" escapes me now.
>>
>>>>>> I believe that's a convection circulating system.
>>
>>>>>> Large buildings use a circulating pump in the hot water piping,
>>>>>> with a large central boiler as the source.
>>
>>>>> But for hot water? Residential? It's possible, sure, just would
>>>>> like to see how this thing works. Sounds too complicated to be
>>>>> reliable.
>>
>>>> As I re-plumb my house, I have added a recirculation pump and extra
>>>> return line. If I'm going to want hot water, I push a button, and
>>>> 30 seconds later (or less) I can turn on the hot and have it hot
>>>> in 2 seconds.
>>
>>> At the cost of twice as much wasted hot water. I understand how a
>>> recirculation pump works. How's this magic manifold work?
>>
>> At the cost of no wasted hot water, in fact no wasted $.017/gallon
>> water. I don't have a clue what the "magic manifold" you speak of is.
>
> When you turn off the hot water you now have twice as much "waste" hot
> water in the lines. Read the thread.

No, I don't. The pump turns off before the return pipe is filled. And I haven't
dumped the water in the pipe down the drain waiting for it to get hot. Try
thinking.