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Old 08-04-2019, 09:19 AM   #1
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Anode rod?

Is it normal these days for there to be no anode rod in water heater tank? What prevents corrosion?
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Old 08-04-2019, 09:25 AM   #2
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Different brand? Two major brands and each has a different way to deal with corrosion. I tend to prefer no anode as I have one now and it is a pain to hold it straight to rethread it into the tank after draining. The long shaft weight tends to pull it down too far for correct alignment. Other tanks without rods, I've always just swapped out the plug for a small drain valve. As far as I see, neither lasts any better than the other.
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Old 08-05-2019, 10:32 AM   #3
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Thanks...I've owned trailers for the last 10 years but never seen a tank without an anode rod...didn't know there was such a tank. Not sure on brand, I'll have to look, but what is the actual mechanism/design that prevents corrosion in a tank without an anode rod? Or is this just another way for companies to cheap out and have things fail earlier so you have to buy a new tank? Even the hot water tanks in residential homes have sacrificial anode rods...
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Old 08-05-2019, 11:01 AM   #4
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That's where we each get such a small view of the world that we often get different ideas of the same thing!
My experience with anode rods has mostly been on home water heaters where only electrical heat has them as it is a function of the power being used. But on RV, the only time I've had a rod is the newish one that my current heater uses. I think it is a Suburban brand but the other major brand does not use a rod.
Since my other RV have always been almost old enough to vote and still had the original water heaters, I never felt a rod was needed. Apparently there are different ways to treat the inside of the tank to prevent corrosion, one uses a rod and the other coats the inside.
So have the home heaters that you have used, electrical or gas heaters? I've never seen a gas water heater that had a rod but that may be as simple as what part of the country as the water can be so different, place to place.
Or it could also be true that what I assumed was just a matter of not looking at the total picture and by luck of the draw, only getting what I've seen.
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Old 08-05-2019, 06:48 PM   #5
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Per this post over on iRV2:

Quote:
Suburban HAS to use an anode rod due to STEEL Tank that is glass-lined BUT the glass-lining does NOT fully cover ALL interior surfaces plus it will have hair-line cracks....STEEL RUSTS

Atwood does NOT need an anode rod as their tanks a re ALUMINUM with a 'cladding' on interior that acts as an anode surface.
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Old 08-11-2019, 07:18 PM   #6
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Anode

Attwood water heaters don't need an anode due to the metal the tank is made of.
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Old 08-11-2019, 07:58 PM   #7
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Anytime two dissimilar metals come into contact with an acid a battery is created. We feel it in our mouth when a fork touches a metal filling on a tooth. Ships/boats have their metal surfaces eroded away unless something electrically is done. Oil towers in the oceans also erode away unless the frame is electrically charged to prevent it.

The exact same thing happens inside a water heater unless a sacrificial anode is used or in the manufacturing process something is done to prevent the two metals coming in contact with the water.

In the case of the anode it is sacrificed instead of your water heater container.

Where does the acid come from? Most waters contain minerals/chemicals/iron etc and some of those can become acidic creating the current flow and corrosion similar to a battery.

The exact same electrical transfer principal or process is used to electroplate the surfaces of metals with gold, nickle, chrome, or silver etc, etc.
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Old 08-12-2019, 06:58 AM   #8
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Anode rods are not necessary,
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Old 08-12-2019, 09:36 AM   #9
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Dibbsvtx1,

Don't know where you came up with that idea and giving incorrect or misleading information is not right. They are absolutely necessary to replace once they are eroded away if you have a hot water tank with a sacrificial anode rod.
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