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Old 10-16-2011, 05:25 PM   #1
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blowing out water lines - how do I get water out of water heater/holding tank?

supposed to get our first frost one night this week. So I blew out all the water lines on the pop-up. I can hear water gurgling in the hot water heater tank, how does one completely drain it?

I also noticed there is about 1 inch of water in the fresh water tank that is below the petcock drain valve. Again, how do you get it out?

Thanks for the help.
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Old 10-16-2011, 05:27 PM   #2
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supposed to get our first frost one night this week. So I blew out all the water lines on the pop-up. I can hear water gurgling in the hot water heater tank, how does one completely drain it?

Thanks for the help.

Did you remove the drain plug? If so, I am not sure how to remove the remaining water.

Dave
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Old 10-16-2011, 05:29 PM   #3
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Did you remove the drain plug? If so, I am not sure how to remove the remaining water.

Dave
There is a drain plug in the hot water heater? I felt around the thing but could not find one.
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Old 10-16-2011, 05:38 PM   #4
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Open the outside cover and at the bottom of the tank is the drain plug.
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Old 10-16-2011, 05:45 PM   #5
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Here is a photo I found on the internet.

Draining an RV Water System
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Old 10-16-2011, 05:58 PM   #6
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A little water in the bottom of hot water tank or the fresh water/waste water tank is completely fine.
Itís been a long time since high school physics class but hereís the reason why.

Damage comes from the water expanding in a confined space while freezing.
Water freezing in a water line can cause the line to bulge & possibly rupture.
This is most likely going to happen @ a low point (dip) in the line or @ an elbow.
Water freezing in a faucet will cause the parts in the faucet to expand against each other.
When the faucet thaws thereís a gap & you have a leak.

Relax, A little water in the bottom of a LARGE tank will not expand enough to cause any damage. You will never be able to remove all the water.

Furthermore a small frost will generally not cause any freezing issues.
You have to have a continuous below freezing temp for any damage to take place.

For most of the US (for the next couple weeks) just draining/blowing out the lines & leaving faucets open will prevent any damage.
Iím in northeast PA & just blow out the lines after each use clear into Dec. Have been doing this for 20 yrs with four different campers. Never had an issue.
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Old 10-17-2011, 07:26 PM   #7
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The drain plug is also the heater anode rod, remove and the tank empties.
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Old 10-17-2011, 08:26 PM   #8
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thanks daveinpickerington. the irony is before the dsys of the internet, I would have kept looking at it till I found it.

3 happy campers: one of concerns with plastic tanks is that the freeze may begin to weaken and age the plastic, but i take your point, not going to be cold enough here to do any damage.
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Old 10-18-2011, 01:41 AM   #9
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If you winterize with rv antifreeze(the pink stuff) as we have to in the frozen north, any water left in the grey and black tanks will be diluted with antifreeze as you run it through the water lines. Anything left in the fresh water tank would be minimal and freezing won't harm the tank. The hot water tank is the same, after removing the anode rod or drain plug there won't be enough water to do any damage. Been doing this for about 18 years on different trailers with no problems.

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Old 10-18-2011, 08:14 AM   #10
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Perhap's after removing water heater plug and anode rod, blow air throuth the line's. The drain plug is the rusty one at the bottom.
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