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Cold water return for a hot water line Bob 07-20-2005
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Posted by Bob on July 20, 2005, 9:18 pm


This is my first visit to this group, so the question may be
a repeat.
I am thinking about installing a return pipe on my hot water
feed to the kitchen to reduce the amount of cold water that
is wasted before the hot water has reached the sink.
Where is the best place to make the connection close to the
hot water tank? It takes nearly four litres of cold water to
run through the pipes before the hot water arrives. I have
lots of pipe and connections left over from different
projects and I might as well use them for this. My ceiling
is easy to access. My problem is knowing where to connect
near the tank.
I have also read that some people have installed a "U" near
the tank to reduce the loss of heat when hot water is not
being drawn for use. Anyone have any details about this idea?
Many thanks for your ideas.

Bob


Posted by Andy on July 20, 2005, 7:21 pm


Andy writes:

Remember, you are going to have to have an external pump
to do this because the pressure in the cold water line is the
same as the pressure in the hot water line.

To have instant hot water, the pump must operate continuously.
This is a valid technical solution to your problem, but a costly one.

I would suggest that you put a flash hot water heater at the
point of use. That way you wouldn't need to use energy until
you are ready to use water.

On the other hand, 4 litres of water doesn't cost much. It is
about the same as flushing a toilet.

In my house, I have installed a smaller hot water heater
in series with the hot water line at the point of use. It doesn't
work nearly as well as a flash heater, or the recirculating
pump that you propose, but it works well enough....

Just some suggestions...

Andy



Posted by ~^Johnny^~ on July 20, 2005, 8:57 pm


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

wrote:

>This is my first visit to this group, so the question may be
>a repeat.
>I am thinking about installing a return pipe on my hot water
>feed to the kitchen to reduce the amount of cold water that
>is wasted before the hot water has reached the sink.
>Where is the best place to make the connection close to the
>hot water tank? It takes nearly four litres of cold water to
>run through the pipes before the hot water arrives. I have
>lots of pipe and connections left over from different
>projects and I might as well use them for this. My ceiling
>is easy to access. My problem is knowing where to connect
>near the tank.
>I have also read that some people have installed a "U" near
>the tank to reduce the loss of heat when hot water is not
>being drawn for use. Anyone have any details about this idea?
>Many thanks for your ideas.
>
>Bob

Maybe you could use a chilipepper...

http://www.cetsolar.com/chilipepper.htm


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=2JtR
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--
-john
wide-open at throttle dot info


Posted by Bob on July 21, 2005, 9:01 am


~^Johnny^~ wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> wrote:
>
>>This is my first visit to this group, so the question may be
>>a repeat.
>>I am thinking about installing a return pipe on my hot water
>>feed to the kitchen to reduce the amount of cold water that
>>is wasted before the hot water has reached the sink.
>>Where is the best place to make the connection close to the
>>hot water tank? It takes nearly four litres of cold water to
>>run through the pipes before the hot water arrives. I have
>>lots of pipe and connections left over from different
>>projects and I might as well use them for this. My ceiling
>>is easy to access. My problem is knowing where to connect
>>near the tank.
>>I have also read that some people have installed a "U" near
>>the tank to reduce the loss of heat when hot water is not
>>being drawn for use. Anyone have any details about this idea?
>>Many thanks for your ideas.
>>
>>Bob
>
> Maybe you could use a chilipepper...
>
> http://www.cetsolar.com/chilipepper.htm
>
Interesting little machine, but not economical for me. I
don't pay for the volume of water that I use - flat annual
fee and electricity to heat the water is about $0.07 per kw
hour (cdn) so I would have to llive a long while to pay for
the little hot one.
Thanks for the link. It never hurts to know what is on the
market.

Bob


Posted by Olaf on July 21, 2005, 11:29 pm




> Interesting little machine, but not economical for me. I
> don't pay for the volume of water that I use - flat annual
> fee and electricity to heat the water is about $0.07 per kw
> hour (cdn) so I would have to llive a long while to pay for
> the little hot one.
> Thanks for the link. It never hurts to know what is on the
> market.
>
> Bob

Wow, nice electricity price. How much for the flat anual water fee?




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