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#4659341 - 02/07/18 05:57 PM gas water heater question
Donald Offline


Registered: 03/21/04
Posts: 20447
Loc: Upstate NY
My home in DE has about a 60 gallon gas water heater. When I leave I turn the thermostat down to minimum, probably 90F. When I return a few weeks latter I turn it to mid point, maybe 140F. I assume the gas flame heats the water in the bottom and by convection the heat moves up to the 90F water at the top of the tank until the whole tank is 140F.

How long should the process take? It seems to take overnight. I would think it would take less than 1 hour.
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#4659356 - 02/07/18 06:12 PM Re: gas water heater question [Re: Donald]
skyactiv Offline


Registered: 03/02/13
Posts: 4392
Loc: The Midwest
Maybe the dip tube is shot?
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#4659357 - 02/07/18 06:13 PM Re: gas water heater question [Re: Donald]
gathermewool Offline


Registered: 01/09/09
Posts: 5987
You just told us how long it takes. happy


Edited by gathermewool (02/07/18 06:18 PM)

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#4659378 - 02/07/18 06:34 PM Re: gas water heater question [Re: Donald]
gregk24 Offline


Registered: 04/13/13
Posts: 5600
Loc: FL, USA
Mine is a 30 gallon unit, and even after running all the hot water out (after showers / dishwater / etc.) it doesn't take very long to heat back up to the desired temperature. Maybe 30 minutes.
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#4659411 - 02/07/18 07:00 PM Re: gas water heater question [Re: Donald]
Wolf359 Offline


Registered: 04/27/12
Posts: 4742
Loc: MA
Whatever the recovery rate of the water heater is. Typically it would say something like 60 gallons in an hour or something like that. If it takes all day, it's taking too long and there's something wrong. Dip tube, thermostat, sediment, bad burner, gas pressure, etc.

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#4659416 - 02/07/18 07:07 PM Re: gas water heater question [Re: Donald]
BalticBob Offline


Registered: 11/27/16
Posts: 395
Loc: Texas
It should take no more than an hour.
If it is a old water heater and/or you have hard water, sediment in the tank bottom is like an insulator. Has the tank been drained once a year to flush the sediment? If it has never been flushed, the drain valve will be clogged. If it is, you may be able to use a stiff wire to break the clog loose. It is a chore.

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#4659450 - 02/07/18 07:48 PM Re: gas water heater question [Re: Donald]
Donald Offline


Registered: 03/21/04
Posts: 20447
Loc: Upstate NY
Once the temp is up to the set temp, it works fine. It seems to be something with turning up the temp from low to mid.
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#4659537 - 02/07/18 09:06 PM Re: gas water heater question [Re: Donald]
TmanP Offline


Registered: 10/30/15
Posts: 436
Loc: MN
We do the same with a 40 gallon gas whenever we're gone for more than a couple days.
It takes 30 minutes or so until you get some warm water, the thermostat shuts it off 45 min to an hour after turning it back up.
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#4659541 - 02/07/18 09:09 PM Re: gas water heater question [Re: Donald]
Wolf359 Offline


Registered: 04/27/12
Posts: 4742
Loc: MA
Then it could be temperature probe. You can replace those, but they go inside the water heater so you should either drain it or do it when it's cold as some water can come out. If it's under warranty, they'll usually send you the part but labor is typically only one year so you'll have to find a plumber to do it if it's over a year old. Or if it's not, then who knows what that part goes for, might be time for a new one.

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#4659585 - 02/07/18 10:09 PM Re: gas water heater question [Re: Donald]
bubbatime Offline


Registered: 03/18/08
Posts: 5622
Loc: South Florida
I have a 40 gal electric that I turn off when I go on vacation for a few days or more. It takes less than an hour to go from full cold to full warm when I turn it back on. Gas should be similiar.
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#4659615 - 02/07/18 11:05 PM Re: gas water heater question [Re: Donald]
2strokeNorthstar Offline


Registered: 07/19/17
Posts: 272
Loc: PR CA, USA
Age and condition is the determining factor.

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#4659624 - 02/08/18 12:30 AM Re: gas water heater question [Re: Donald]
oldhp Offline


Registered: 06/28/12
Posts: 1621
Loc: USA
Do you drain some water out every spring to keep the rust/sediment from impeding the heat? I use the hose off the AC. I let it run wide open for about 30 seconds. My Dad said to do this many years ago.
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