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#4617286 - 12/28/17 10:41 PM How does the water inside pipes get so cold?
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4716
Loc: Houston, Texas
You know when it's cold outside and you take a shower and the first 10 seconds of water is freezing cold? Does the area in between the sheetrock really get that cold when the house is 70 degrees?
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#4617289 - 12/28/17 10:45 PM Re: How does the water inside pipes get so cold? [Re: motor_oil_madman]
spasm3 Offline


Registered: 05/30/10
Posts: 8424
Loc: North Carolina
If your pipes are deep enough, i think most ground temps are 52F.
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#4617292 - 12/28/17 10:47 PM Re: How does the water inside pipes get so cold? [Re: motor_oil_madman]
bdcardinal Offline


Registered: 06/03/05
Posts: 10807
Loc: Santa Barbara, CA
Cal me crazy and wasteful but I don't get in the shower until the water is hot.
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#4617298 - 12/28/17 10:54 PM Re: How does the water inside pipes get so cold? [Re: motor_oil_madman]
Linctex Online   content


Registered: 12/31/16
Posts: 5689
Loc: Waco, TX
Originally Posted By: motor_oil_madman
You know when it's cold outside and you take a shower and the first 10 seconds of water is freezing cold? Does the area in between the sheetrock really get that cold when the house is 70 degrees?


You are in Houston.

Don't be surprised if your house has no insulation. Really.
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#4617299 - 12/28/17 10:56 PM Re: How does the water inside pipes get so cold? [Re: motor_oil_madman]
BobsArmory Offline


Registered: 03/28/10
Posts: 1307
Loc: Michigan
Tap water in Michigan is always freezing cold.
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#4617300 - 12/28/17 10:57 PM Re: How does the water inside pipes get so cold? [Re: motor_oil_madman]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17183
Loc: PNW
If the house has a crawl space, then water plumbing is in the cold, If not insulated well they will get pretty cold if no hot water is flowing through them for a long time.
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#4617302 - 12/28/17 11:02 PM Re: How does the water inside pipes get so cold? [Re: bdcardinal]
Leo99 Offline


Registered: 03/30/14
Posts: 2874
Loc: NJ
Originally Posted By: bdcardinal
Cal me crazy and wasteful but I don't get in the shower until the water is hot.



Takes my shower about 3 minutes to warm up. There's a lot of piping from the HWH in basement up to the shower.

I'm crazy like you.
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#4617305 - 12/28/17 11:05 PM Re: How does the water inside pipes get so cold? [Re: spasm3]
Chris142 Online   content


Registered: 06/05/03
Posts: 16516
Loc: Deplorable in apple valley, ca
Originally Posted By: spasm3
If your pipes are deep enough, i think most ground temps are 52F.
water comming out of my well is 59f.
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#4617309 - 12/28/17 11:11 PM Re: How does the water inside pipes get so cold? [Re: motor_oil_madman]
OTCW Online   content


Registered: 05/07/17
Posts: 49
Loc: Tennessee
If your water comes from a surface source vs a well source, it is pretty cold to stary with when the weather is cold outside.
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#4617326 - 12/28/17 11:39 PM Re: How does the water inside pipes get so cold? [Re: Leo99]
bbhero Offline


Registered: 03/20/15
Posts: 4373
Loc: Virginia
I thought you were crazy long before reading this....

Just messing with ya smile
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#4617342 - 12/29/17 12:00 AM Re: How does the water inside pipes get so cold? [Re: motor_oil_madman]
PimTac Online   content


Registered: 03/04/17
Posts: 3458
Loc: Soviet State of Washington
How cold does it get in Houston? Where does your water come from? Important questions to your question.
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#4617348 - 12/29/17 12:13 AM Re: How does the water inside pipes get so cold? [Re: motor_oil_madman]
Shannow Offline


Registered: 12/12/02
Posts: 38968
Loc: 'Stralia
My old house was two sheets of sheetrock, and about 3" of airgap...the water could be freezing cold (or frozen) or scalding depending on what was going on.

Funny, only woke up this morning recollecting a thermodynamics assignment where we had to work out heat transfer difference between lagged and unlagged pipes...1/4" (yes not your size), and typically lagging actually increases heat transfer with run of the mill pipe insulation.

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#4617468 - 12/29/17 07:40 AM Re: How does the water inside pipes get so cold? [Re: bdcardinal]
Bud Offline


Registered: 06/04/02
Posts: 1620
Loc: Texas
Originally Posted By: bdcardinal
Cal me crazy and wasteful but I don't get in the shower until the water is hot.


Wasteful or not, your way is the only way to go.
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#4617469 - 12/29/17 07:43 AM Re: How does the water inside pipes get so cold? [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4716
Loc: Houston, Texas
I'm just talking about the pipes in between the water heater and shower. So 18ft or So?
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#4617473 - 12/29/17 07:49 AM Re: How does the water inside pipes get so cold? [Re: motor_oil_madman]
redhat Offline


Registered: 12/07/12
Posts: 1701
Loc: Anywhere, USA
Well that water that isn't moving will at some point get down to ambient temperature. Since most of us run around 98.6 degrees F, 70 would seem pretty cold.
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