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 > Water heater, anode rod, electrolysis, and teflon tape

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bob213

Fresno, CA

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Posted: 01/15/19 03:33pm Link  |  Quote  |  Print  |  Notify Moderator

I believe it was Doug who suggested Rectorseal as the best alternative.


You can avoid reality, but you cannot avoid the consequences of avoiding reality – Ayn Rand


BB_TX

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Posted: 01/15/19 03:40pm Link  |  Quote  |  Print  |  Notify Moderator

wgriswold wrote:

........
Do you have a reference for the Suburban statement. I can't find it on their site.
.......

The quoted statement in my post is from an e-mail from a Suburban assistant service manager when I ask if there needed to be electrical contact between the anode rod and the tank. The response came within a half day of my e-mailed question. Go to their web site, click on CONTACT US, and ask for further info if you need it.

"The answer is No. The metal threads do not need to make contact with each other. Electrolysis is the chemical reaction that takes place inside the tank and has nothing to do with the threads. I've attached some Suburban water heater videos to this email that I believe you'll find very interesting."

MFL

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Posted: 01/15/19 03:41pm Link  |  Quote  |  Print  |  Notify Moderator

bob213 wrote:

I believe it was Doug who suggested Rectorseal as the best alternative.


Yes he did, and while I've had no issue using tape, I'm going to give this product a try.

Jerry





DutchmenSport

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Posted: 01/15/19 04:45pm Link  |  Quote  |  Print  |  Notify Moderator

Delete

* This post was edited 01/20/19 07:35pm by DutchmenSport *

ScottG

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Posted: 01/15/19 06:41pm Link  |  Quote  |  Print  |  Notify Moderator

I would rather use tape than sealant. The tape will come off cleanly where sealant is a lot more work to get comepletely off.

twodownzero

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Posted: 01/15/19 06:43pm Link  |  Quote  |  Print  |  Notify Moderator

donn0128 wrote:

No. According to Suburban the anode rod uses a chemical reaction NOT electrical.
It could be totally isolated from any metal and will still perform its intended function. Think sacrifical anodes on a boat for an example.


Did you take chemistry in high school? Chemical reactions generally are electrical. I only took one semester so I can't say that all chemical reactions are electrical, but the ones I remember from class certainly were.

fj12ryder

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Posted: 01/15/19 07:59pm Link  |  Quote  |  Print  |  Notify Moderator

donn0128 wrote:

No. According to Suburban the anode rod uses a chemical reaction NOT electrical.
It could be totally isolated from any metal and will still perform its intended function. Think sacrifical anodes on a boat for an example.
This had me wondering since I thought I knew how it worked, but you would think the Suburban assistant service manager might be aware, but according to this article from a boating magazine, he is incorrect.

"There is an unfortunate misconception that a sacrificial anode can be mounted anywhere, even hung over the side on a string, and it will still perform its appointed duty. That is dead wrong!

For a zinc anode to provide any protection, it must be in electrical contact with the metal being protected. The conductivity of the water is not adequate. We need low-resistance, metal-to-metal contact..."

He refers to zinc as that seems to be the material most commonly used on boats, but the operation is the same.


Howard and Peggy

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pigman1

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Posted: 01/15/19 11:05pm Link  |  Quote  |  Print  |  Notify Moderator

I don't know where the Suburban guy got his information and education about electrolysis, but he definitely needs to go back to school. fj12ryder has it absolutely correct. Corrosion is an electrical process and needs the anode in electrical contact with the metal being corrected. A simple test with an ohmmeter will tell you that the anode and the tank are in excellent electrical contact, even when teflon tape is used to seal the threads.


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Cummins12V98

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Posted: 01/16/19 04:46am Link  |  Quote  |  Print  |  Notify Moderator

MFL wrote:

bob213 wrote:

I believe it was Doug who suggested Rectorseal as the best alternative.


Yes he did, and while I've had no issue using tape, I'm going to give this product a try.

Jerry


ALL the Plumbers I worked with use RectorSeal. Some use Teflon Tape with some don't.

Most Teflon tape is junk, it's stiff. Like everything else there is junk look alike and there is quality.


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BB_TX

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Posted: 01/16/19 07:43am Link  |  Quote  |  Print  |  Notify Moderator

Seems even the "experts" are not in agreement. Some web sites have statements such as
Galvanic corrosion refers to corrosion damage that occurs when two different metals are in electrical contact in an electrolyte, where the more noble metal is protected and the more active metal tends to corrode.
Whereas some others have statements such as
This rapid corrosion occurred because of a chemical process called galvanic corrosion. Galvanic corrosion can only occur when two electrochemically different metals are close to one another and also submerged in an electrolytic liquid
Note the word "close" rather than "contact".
So I guess it all depends on which "expert" you are talking to at the time.

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