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Old 12-16-2016, 02:11 PM   #1
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Pressure in water heater

For the 6th year straight of draining my water heater by removing my sacrificial anode bottom plug for the winter it came out with lots of pressure for the first time ever. Last used early Sept. 2016 with city water and sitting in shed since, mid Dec.. Both water heaters were off as well as pump, checked twice. Couldn't locate mysterious disappearing teflon tape for re install after empty so I temporarily tightened hand tight. Bought two more rolls of tape the next day and removed again, not nearly as much, but pressure again.
. Any thoughts appreciated, John in SC
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Old 12-17-2016, 08:10 AM   #2
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Open pressure relief valve first.
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Old 12-17-2016, 08:52 AM   #3
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Be sure the tank has cooled off.

Open a hot water faucet!
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Old 12-17-2016, 08:57 AM   #4
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Not uncommon for some pressure to be there the first time but what I find unusual is once you removed the anode rod and reinserted finger tight while waiting to get teflon tape, that there was pressure build up again.

Once the tank is empty, there would be nothing but air in the tank to expand.

When you removed the anode/plug the second time was there actually water or just a swish of air?
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Old 12-17-2016, 09:22 AM   #5
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Not uncommon for some pressure to be there the first time but what I find unusual is once you removed the anode rod and reinserted finger tight while waiting to get teflon tape, that there was pressure build up again.

Once the tank is empty, there would be nothing but air in the tank to expand.

When you removed the anode/plug the second time was there actually water or just a swish of air?
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Old 12-17-2016, 09:31 AM   #6
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I am in this corner! Youroo! !
I just stand to one side, less chance of a ricochet shower.......
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Old 12-17-2016, 11:37 AM   #7
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WH pressure

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Not uncommon for some pressure to be there the first time but what I find unusual is once you removed the anode rod and reinserted finger tight while waiting to get teflon tape, that there was pressure build up again.

Once the tank is empty, there would be nothing but air in the tank to expand.

When you removed the anode/plug the second time was there actually water or just a swish of air?
A light swish of air.
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Old 12-17-2016, 12:29 PM   #8
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Palmettoe,are you sure you have two "water heaters "! Youroo! !
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Old 12-17-2016, 01:43 PM   #9
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Palmettoe,are you sure you have two "water heaters "! Youroo! !
Problem is that the OP has a Heartland RV, not a FR product.
So chances are that no one on the Forum, has his RV.

Not familiar with any RV with 2 water heaters unless it has 2 bathrooms.
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Old 12-17-2016, 03:36 PM   #10
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biken. I had a Heartland Pioneer. It's just an everyday affordable TT that looks like any other basic TT with the same stuff. i'm pretty sure there are a lot of Thor owners on this site.
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Old 12-17-2016, 05:42 PM   #11
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biken. I had a Heartland Pioneer. It's just an everyday affordable TT that looks like any other basic TT with the same stuff. i'm pretty sure there are a lot of Thor owners on this site.
A basic TT doesn't come with 2 water heaters.
I don't have any problem that it's a SOB, just would like to know what model RV he has, that has two water heaters.
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Old 12-17-2016, 06:06 PM   #12
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Don't think it has two. Never implied a basic had two.
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Old 12-17-2016, 07:30 PM   #13
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I assume when you say two water heaters you meant gas/electric elements on one unit. That said, original buildup could have been city water pressure not released. If you didn't drain the system, water heater is usually a low point in the system and water back pressure may cause pressure the second time. Other than that I don't have any other thoughts
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Old 12-17-2016, 07:59 PM   #14
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Just rereading." Couldn't locate mysterious disappearing teflon tape for re install" ??
Can't use it over.
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Old 12-17-2016, 08:08 PM   #15
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Seems that the OP needs to clear up some comments. Two things that stand out is the missing tape and the second pressure release. Hard to get my mind around the last one.
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Old 12-17-2016, 10:31 PM   #16
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Just rereading." Couldn't locate mysterious disappearing teflon tape for re install" ??
Can't use it over.
Happens to me a lot, I put a roll of tape in my tool box and when I need it, it isn't there... I swear, I ALWAYS have a roll each of duct, electric, and Teflon. Except when I need to use one and that is the one that is missing. I think Scotty from Star Trec watches me and beams them out.

Wonder if there was a significant ambient temperature change between the two openings, that could cause a bit of an air swish.
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Old 12-18-2016, 03:51 AM   #17
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Pressure in water heater tank

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Palmettoe,are you sure you have two "water heaters "! Youroo! !
Water heater elements, one gas and one electric.
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Old 12-18-2016, 03:55 AM   #18
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water heater

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A basic TT doesn't come with 2 water heaters.
I don't have any problem that it's a SOB, just would like to know what model RV he has, that has two water heaters.
Heaters, not tanks
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Old 12-18-2016, 05:01 AM   #19
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Quote:
Originally Posted by palmettoe View Post
Water heater elements, one gas and one electric.
Quote:
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Heaters, not tanks
Palmettoe, I believe you may possibly be meaning two heating "sources" which one is propane gas and the other is the electric heating element.

You only have ONE element, which is the 120 volt AC electric heating element inside the water heater tank......and you also have a propane burner, which heats up the same tank from the outside of it.

It's all considered ONE water heater, with two heating sources (the electric element inside the tank, and the propane burner outside the tank). It's just your terminology that may be confusing to others. They call this type of water heater a "combination gas/electric water heater".

http://www.airxcel.com/suburban/prod...n-gas-electric



An easy way to think of your combination gas/electric water heater is to put a pot of water on a gas stove. Now if you turn on the gas burner underneath the pot(tank), this is your how your RV water heater uses propane to heat the water.

Now for our purpose. imagine you had an electric space heater that was waterproof, that you could drop down into the same pot to heat the water. This is your electric heating element in your RV water heater.

You could just use the gas stove to heat the pot, or you could turn the gas off and just use the immersed electric space heater to heat the water....or you could use the gas burner with the electric space heater at the same time and heat the water the fastest way.
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Old 12-18-2016, 06:47 AM   #20
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Palmettoe,are you sure you have two "water heaters "! Youroo! !
Boy I am glad I didn't say "Hot water heater " like a lot of people say, or I would be in "Hot Water"! Youroo! !
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