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Home > Archive > Home Repair forum > April 2008 > Plumbing: What size hot water pipe do I need?
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Plumbing: What size hot water pipe do I need?
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| NoSpam@aol.com 2008-04-03, 9:25 am |
| I need to run hot water to lavatories, sinks, tubs, showers, washing
machine, dishwasher and a 60 gallon whirlpool tub in my home. Especially
for the sinks and lavatories I would like to use the smallest size pipe
that will provide sufficient flow. Lavatories and sinks often use
relatively small amounts of hot water at a time (wash hands, rinse
something). I think a smaller pipe would result in less waste and less
waiting for the water to get hot.
Appliances such as tubs, etc. are used less frequently and use much more
hot water at a time, so the initial wait and the waste of the hotwater left
in the pipe should not matter so much and a high flow rate is more
important.
Running separate pipes of different sizes to the same bathroom is no
problem if it will improve performance & save energy. I realize that
running the lavatory faucet and a tub/shower would require filling two
pipes, but this will seldom be done at the same time so the water in the
pipe would cool down between the uses.
Question: What size pipe should I run to each type of appliance?
Lavatory:
Sink:
Tub/Shower:
Whirlpool: 3/4" as valve inlets are 3/4"
Dishwasher:
Washing Machine:
Thanks so much for your help.
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| hallerb@aol.com 2008-04-03, 9:25 am |
| On Apr 3, 6:23=EF=BF=BDam, NoS...@aol.com wrote:
> I need to run hot water to lavatories, sinks, tubs, showers, washing
> machine, dishwasher and a 60 gallon whirlpool tub in my home. =EF=BF=BDEsp=
ecially
> for the sinks and lavatories I would like to use the smallest size pipe
> that will provide sufficient flow. =EF=BF=BDLavatories and sinks often use=
> relatively small amounts of hot water at a time (wash hands, rinse
> something). =EF=BF=BDI think a smaller pipe would result in less waste and=
less
> waiting for the water to get hot.
>
> Appliances such as tubs, etc. are used less frequently and use much more
> hot water at a time, so the initial wait and the waste of the hotwater lef=
t
> in the pipe should not matter so much and a high flow rate is more
> important.
>
> Running separate pipes of different sizes to the same bathroom is no
> problem if it will improve performance & save energy. =EF=BF=BDI realize t=
hat
> running the lavatory faucet and a tub/shower would require filling two
> pipes, but this will seldom be done at the same time so the water in the
> pipe would cool down between the uses.
>
> Question: =EF=BF=BDWhat size pipe should I run to each type of appliance?
>
> Lavatory:
> Sink:
> Tub/Shower:
> Whirlpool: =EF=BF=BD3/4" as valve inlets are 3/4"
> Dishwasher:
> Washing Machine:
>
> Thanks so much for your help.
are you running PEX ? individual lines to each outlet has lots of
advantages, and be certain to insulate all hot water lines
| |
| NoSpam@aol.com 2008-04-03, 9:25 am |
| Yes, I am running PEX. I am planning to run a line to my kitchen sink and
then to a veggie sink because they are close together and will frequently
be used together.
On Thu, 3 Apr 2008 04:37:06 -0700 (PDT), "hallerb@aol.com"
<hallerb@aol.com> wrote:
>On Apr 3, 6:23?am, NoS...@aol.com wrote:
>
>are you running PEX ? individual lines to each outlet has lots of
>advantages, and be certain to insulate all hot water lines
| |
| nicksanspam@ece.villanova.edu 2008-04-03, 9:25 am |
| hallerb@aol.com <hallerb@aol.com> wrote:
>... be certain to insulate all hot water lines
How much energy would we save by adding R2 insulation to 100' of 1/2" pipe,
with 6 10 gallon hourly 110 F water uses per day at 3 gpm (an SRCC standard
test condition)?
Hint: not much, since there isn't much water in 1' of pipe, so it cools fast
between uses, even with lots of insulation.
Nick
| |
| Blattus Slafaly 0/00 ? ? ? 2008-04-03, 9:25 am |
| NoSpam@aol.com wrote:
> I need to run hot water to lavatories, sinks, tubs, showers, washing
> machine, dishwasher and a 60 gallon whirlpool tub in my home. Especially
> for the sinks and lavatories I would like to use the smallest size pipe
> that will provide sufficient flow. Lavatories and sinks often use
> relatively small amounts of hot water at a time (wash hands, rinse
> something). I think a smaller pipe would result in less waste and less
> waiting for the water to get hot.
>
> Appliances such as tubs, etc. are used less frequently and use much more
> hot water at a time, so the initial wait and the waste of the hotwater left
> in the pipe should not matter so much and a high flow rate is more
> important.
>
> Running separate pipes of different sizes to the same bathroom is no
> problem if it will improve performance & save energy. I realize that
> running the lavatory faucet and a tub/shower would require filling two
> pipes, but this will seldom be done at the same time so the water in the
> pipe would cool down between the uses.
>
> Question: What size pipe should I run to each type of appliance?
>
> Lavatory:
> Sink:
> Tub/Shower:
> Whirlpool: 3/4" as valve inlets are 3/4"
> Dishwasher:
> Washing Machine:
>
> Thanks so much for your help.
Put in small 'point of source' water heaters for instant hot water.
--
Blattus Slafaly ? 3  7/8
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| S. Barker 2008-04-03, 9:25 am |
| Just run 3/4 to the first place, and then 1/2" to the second device. No
need to get fancy, you won't save anything.
s
<NoSpam@aol.com> wrote in message
news:eoe9v318mrvfb89604it7qbotnmd51ihca@4ax.com...
>I need to run hot water to lavatories, sinks, tubs, showers, washing
> machine, dishwasher and a 60 gallon whirlpool tub in my home. Especially
> for the sinks and lavatories I would like to use the smallest size pipe
> that will provide sufficient flow. Lavatories and sinks often use
> relatively small amounts of hot water at a time (wash hands, rinse
> something). I think a smaller pipe would result in less waste and less
> waiting for the water to get hot.
>
> Appliances such as tubs, etc. are used less frequently and use much more
> hot water at a time, so the initial wait and the waste of the hotwater
> left
> in the pipe should not matter so much and a high flow rate is more
> important.
>
> Running separate pipes of different sizes to the same bathroom is no
> problem if it will improve performance & save energy. I realize that
> running the lavatory faucet and a tub/shower would require filling two
> pipes, but this will seldom be done at the same time so the water in the
> pipe would cool down between the uses.
>
> Question: What size pipe should I run to each type of appliance?
>
> Lavatory:
> Sink:
> Tub/Shower:
> Whirlpool: 3/4" as valve inlets are 3/4"
> Dishwasher:
> Washing Machine:
>
> Thanks so much for your help.
| |
| RicodJour 2008-04-03, 9:25 am |
| On Apr 3, 7:41 am, NoS...@aol.com wrote:
> Yes, I am running PEX. I am planning to run a line to my kitchen sink and
> then to a veggie sink because they are close together and will frequently
> be used together.
All you'll need to know.
http://www.toolbase.org/PDF/DesignG...designguide.pdf
R
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