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Old 10-09-2009, 01:21 PM   #1
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Draining Hot Water Tank


I would like to do this as my weekend project. looking online the steps seem pretty basic with a few exceptions. I was wondering if I can turn off the power to the tank for a couple of hours, then run a hot water faucet until cold and then drain the rest of the tank as described online. also, some steps say to open the pressure valve and some do not...

thanks

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Old 10-09-2009, 01:26 PM   #2
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Draining Hot Water Tank


I usually turn off the power the night before
Take a quick shower to get rid of hot water
Then in the morning drain the tank

Are you trying to flush out sediment ?
Make sure the tank is FULL if you drain is BEFORE turning the power back on

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Old 10-09-2009, 01:28 PM   #3
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yes trying to flush the sediment
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Old 10-09-2009, 07:58 PM   #4
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Draining Hot Water Tank


Opening an upstairs faucet is just as good as tripping the pressure valve.

Actually opening a faucet is better because sometimes the pressure valve has sediment in it and it doesn't close completely. So you have to stop work and go out and buy a new pressure relief valve.

To get sediment out, try both ways: cold water feed to tank on, faucets off, open drain valve, and, cold water feed to tank off, faucet open, open drain valve.

The easiest way to prove that the tank is refilled before you turn on the gas or power is to have water coming out of a hot water faucet upstairs.
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Old 10-10-2009, 09:55 AM   #5
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Draining Hot Water Tank


thanks for the information. i think that i will try to get as much of the water out through a faucet upstairs first. this heater is located on the main floor of my house and i will have to run the drain hose about 12 feet before i can get it outside. also, if i don't turn on any of the faucets, other than the one upstairs, i won't have to bleed any of the others correct???
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Old 10-10-2009, 10:19 AM   #6
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Draining Hot Water Tank


Quote:
yes trying to flush the sediment
Ayuh,.... It sounds like you're making a Major production out of a very Simple task....

If all you're attemping to do is flush the sediments,...
Hook up the drain hose,+ Open the drain valve.... The sediments will just flow out....
Not even a reason to turn the Power off,.. New water will flow in as needed....

No reason to flush, drain, bleed or Anything else....
Sediments are just That,... Crap that settled out of the water, they already live at the bottom of the tank, near the Drain....
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Old 10-10-2009, 10:27 AM   #7
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Draining Hot Water Tank


if it is that simple, how come there are so many versions on how to do it? LOL!!!

and you must understand that many of my simple projects turn into big jobs!

LOL!!!
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Old 10-10-2009, 10:29 AM   #8
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Originally Posted by WBNC View Post
if it is that simple, how come there are so many versions on how to do it? LOL!!!

and you must understand that many of my simple projects turn into big jobs!

LOL!!!

Because your using the Internet for research....
You've got to plow thru all the B/S Opinions to get to the Facts....
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Old 10-10-2009, 11:51 AM   #9
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Draining Hot Water Tank


fair enough

then let me ask you this. the reason that i am doing this is because i did some research on the internet. the hot water tank POPS whenever we put a heavy pull on the hot water... showers, washing machine, etc. online research indicated that sediment can be the cause of this issue....
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Old 10-10-2009, 12:29 PM   #10
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Draining Hot Water Tank


Ayuh,... The waterheater Pops, or it's breaker Pops,..?? If the heater,.. Pops as in How,..??
I'd sooner think there's an Issue with the elements, or T-Stats....
But,...
Go crack the drain,+ See what comes out....
Depending on your water contents,... It might be Beat...
Electric heaters with My water only last a few years due to the Nasty hardness of my water...
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Old 10-10-2009, 12:51 PM   #11
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pops as in metal expanding and contracting
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Old 10-10-2009, 02:49 PM   #12
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Draining Hot Water Tank


Sediment can cause popping when the heater is heating water. If it is not heating and you hear popping, you may have high water pressure and the sound you hear is the tank relaxing a bit from the pressure reduction occurring due to a faucet being open. You can buy a gauge to measure your water pressure at big box stores for <$15; it screws onto any hose fitting in the home. If high, you may need a pressure reducing valve installed (then you'll also need an expansion tank as the PRV doesn't allow for the water system to absorb any of your water system's pressure buildup).
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Old 10-10-2009, 03:07 PM   #13
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and what would be considered high pressure?
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Old 10-10-2009, 11:44 PM   #14
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You should have under 80 psi 50-60 is normal 70 is ok more you should install or replace the PRV. even flushing it like that you may still have sediment in the tank and may still get the popping but you should try. I agree just flush it with the water on no need to drain it down.
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Old 10-11-2009, 10:57 AM   #15
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Draining Hot Water Tank


Draining and flushing 101: Turn off the power (electric or gas) to the unit. Shut off the cold water inlet valve to the tank. Open a hot water faucet. Attach a hose to the drain valve on the tank and open it. Once the hose stops flowing water, open the cold water valve for about one minute. Look at the water coming out of the hose. If it still has partcles in it, do this step again until the water runs clear. once the water is clear, you can refill the tank and turn the power back on.
Reasons: Draining the tank and a one minute flush of the tank will help dislodge any deposits on the bottom of the tank. If you just refill the tank after draining, the particles will float and eventually drop back to the tank bottom during non use periods. The drain valve pipe is above the bottom of the tank by at least and inch, so sediment will sit there after draining. You need to get them floating to drain out. The pressure coming out of the dip tube will wash the tank bottom better if there is not a lot of water in the tank. Some tanks have check valves installed from the factory, and this requires opening the T/P valve to allow drainage. The popping sound tells me it is a gas water heater. The deposits sitting on the tank bottom are being heated when the unit kicks on. This is also robbing you of money since the deposits are taking away heat that should be heating the water. The deposits actually boil and cause the sound.

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