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Old 09-23-2016, 04:23 PM   #1
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Another winterization newbie question - water heater

I've read and seen several videos where they suggest you unscrew and remove the water heater drain plug. If I open the low point drains (both hot and cold) and open both the hot and cold water taps, isn't that going to drain most/all of the water in the water heater? And if there is some that doesn't drain out through the low points, does it really matter since there will be a lot of space in the water heater?
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Old 09-23-2016, 04:30 PM   #2
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The tank of the water heater has a check valve in the hot side and will not allow air in so the tank can drain.
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Old 09-23-2016, 04:31 PM   #3
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No. With the location of where the supply lines attach to the water heater, and the use of check valves, your tank will retain way too much water to last through a freeze. Unscrew the plug, if it's a Suburban tank check the condition of the anode, pull open the pressure relief valve and let all water drain out. You can then put a water wand into the drain and flush out all the crud that collects in the tank.

Now you don't have to do as I say, you can put in a new water heater next Spring or have the tank removed and welded if you'd rather.
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Old 09-23-2016, 04:39 PM   #4
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Welcome to irv2.
Open the over flow valve to allow air in tank to drain and here is info for everything else.
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Old 09-23-2016, 04:44 PM   #5
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In addition to the reasons stated already, the heater outlet is near the top of the tank and water is forced out the hot outlet tube only under pressure. As soon as the low point drain is opened, pressure is lost and no water flows out of the tank. You MUST use the tank drain to empty it.
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Old 09-23-2016, 04:57 PM   #6
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Quote:
Originally Posted by 007";3266759]Welcome to irv2.
Open the over flow valve to allow air in tank to drain and [B][URL="http://www.irv2.com/forums/f258/winter-is-just-around-the-corner-309332.html
here is info[/URL][/B] for everything else.
So are you saying that I don't have to pull the drain plug if I open the over flow valve?

And yes, it is a Suburban water heater. It appears to be the original on a 1994 Hy-Line trailer.
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Old 09-23-2016, 06:15 PM   #7
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Opening the overflow (pressure relief valve) alone won't drain the tank, the drain plug must be removed. It's a 1 1/8" nut, on the back of it is an anode. If yours hasn't been checked in a while, it really needs to be removed, inspected, and likely a new plug/anode inserted.

https://www.amazon.com/Suburban-2327.../dp/B003VAYRNM

With one of these, the tank can be flushed.

https://www.amazon.com/Camco-11691-W...6QGHV786B0SKWQ
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Old 09-23-2016, 07:01 PM   #8
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Yes, you have to pull plug as BFlinn 181 has said to do and clean out also.
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