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Posted by Tim on April 29, 2009, 11:41 am
I am getting different answers on this one in the field and I'd like a
little help.
I need to supply gas to a new hybrid water heater. According to the
manufacturer, it requires a 3/4" input line.
The gas line comes directly from the gas meter via a 1" line to the water
heater closet. There, it goes into a Tee. The Tee is a 1" (from the meter),
3/4" that feeds the rest of the house (furnace and stove), and 1/2" that
feeds the existing water heater. Some say I have to remove the Tee and go
with one that gives me a 3/4" line to the rest of the house and a 3/4" line
to the water heater. Others say I can just put a bushing on the 1/2" line,
taking it up to 3/4" and I'll be fine.
I've tried talking to the manufacturer and they do not want to get involved
in "construction matters" (liability worries).
This is in California (1/4 pound pressure gas).
Any thoughts? Go with a new tee or bush up the old one? Or any other idea?
Thanks
Tim
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Posted by RicodJour on April 29, 2009, 12:31 pm
> I am getting different answers on this one in the field and I'd like a
> little help.
> I need to supply gas to a new hybrid water heater. According to the
> manufacturer, it requires a 3/4" input line.
> The gas line comes directly from the gas meter via a 1" line to the water
> heater closet. There, it goes into a Tee. The Tee is a 1" (from the meter=
),
> 3/4" that feeds the rest of the house (furnace and stove), and 1/2" that
> feeds the existing water heater. Some say I have to remove the Tee and go
> with one that gives me a 3/4" line to the rest of the house and a 3/4" li=
ne
> to the water heater. Others say I can just put a bushing on the 1/2" line=
,
> taking it up to 3/4" and I'll be fine.
> I've tried talking to the manufacturer and they do not want to get involv=
ed
> in "construction matters" (liability worries).
> This is in California (1/4 pound pressure gas).
> Any thoughts? Go with a new tee or bush up the old one? Or any other idea=
?
Under the bush-up logic, you could have a 3/4" line come into the
house and bush up to a 1" and have it be the equivalent of a 1" line.
I don't believe that is quite the way it works. With the smaller pipe
you have a restriction, which is the limiting factor.
I am surprised that the manufacturer didn't give more guidance on
this. The normal manufacturer response in such a situation is along
the lines of "you need 3/4" so use 3/4" for the supply line, not just
part of it."
R
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Posted by Wayne Whitney on April 29, 2009, 1:08 pm
> I need to supply gas to a new hybrid water heater. According to the
> manufacturer, it requires a 3/4" input line.
What is demand of the new water heater in BTU/hr?
> The gas line comes directly from the gas meter via a 1" line to the water
> heater closet. There, it goes into a Tee. The Tee is a 1" (from the meter),
> 3/4" that feeds the rest of the house (furnace and stove), and 1/2" that
> feeds the existing water heater. Some say I have to remove the Tee and go
> with one that gives me a 3/4" line to the rest of the house and a 3/4" line
> to the water heater. Others say I can just put a bushing on the 1/2" line,
> taking it up to 3/4" and I'll be fine.
To properly answer this question, you need to tell us:
The length of the 1" pipe from the meter to this Tee.
The length of the pipe run from this Tee to the new water heater.
The demand of the other appliances (the furnace and stove).
Basically, in designing gas piping systems, you are allowed 0.5"
w.c. pressure drop from the regulator to the outlet. Using a 1/2"
port on the tee with a 3/4" bushing will cause more pressure drop than
using a 3/4" tee would. Depending on the pressure drop in the rest of
the system, this may or may not be acceptable.
Cheers, Wayne
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Posted by dpb on April 29, 2009, 1:10 pm
Tim wrote:
...
> I need to supply gas to a new hybrid water heater. According to the
> manufacturer, it requires a 3/4" input line.
>
> The gas line comes directly from the gas meter via a 1" line to the
> water heater closet. There, it goes into a Tee. The Tee is a 1" (from
> the meter), 3/4" that feeds the rest of the house (furnace and stove),
> and 1/2" that feeds the existing water heater. Some say I have to remove
> the Tee and go with one that gives me a 3/4" line to the rest of the
> house and a 3/4" line to the water heater. Others say I can just put a
> bushing on the 1/2" line, taking it up to 3/4" and I'll be fine.
...
> Any thoughts? Go with a new tee or bush up the old one? Or any other idea?
...
What could possibly be so hard about simply putting in a 3/4" tee and
going on?
--
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Posted by on April 29, 2009, 1:16 pm
> Tim wrote:
> ...> I need to supply gas to a new hybrid water heater. According to the
> > manufacturer, it requires a 3/4" input line.
> > The gas line comes directly from the gas meter via a 1" line to the
> > water heater closet. There, it goes into a Tee. The Tee is a 1" (from
> > the meter), 3/4" that feeds the rest of the house (furnace and stove),
> > and 1/2" that feeds the existing water heater. Some say I have to remov=
e
> > the Tee and go with one that gives me a 3/4" line to the rest of the
> > house and a 3/4" line to the water heater. Others say I can just put a
> > bushing on the 1/2" line, taking it up to 3/4" and I'll be fine.
> ...
> > Any thoughts? Go with a new tee or bush up the old one? Or any other id=
ea?
> ...
> What could possibly be so hard about simply putting in a 3/4" tee and
> going on?
> --
Agreed, T in at 3/4" point. If it makes it more convenient you could
replace some of the 1/2" with 3/4" and T in further down. T'ing into
the 1/2" could create flow problems for the other appliances. I would
not do that. As another poster pointed out there are formula for
calculating the pipe size based on the demand of each appliance and
the length of pipe.
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> little help.
> I need to supply gas to a new hybrid water heater. According to the
> manufacturer, it requires a 3/4" input line.
> The gas line comes directly from the gas meter via a 1" line to the water
> heater closet. There, it goes into a Tee. The Tee is a 1" (from the meter=