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Old 07-23-2013, 09:32 AM   #11
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Originally Posted by f1100turbo View Post
Attwood - porcelain or glass lined.
Suburban - metal or stainless lined.
Turbs.

The reason that the Atwood does not use an anode is that the tank itself is all aluminum and there is no electrolytic action between the aluminum and fresh water.

The Suburbans (most common) have IRON boilers and are porcelain coated all over the insides EXCEPT around the penetrations (drain port, pressure relief valve, electrical element (if equipped), water inlet and outlet ports). If they ran the glass up to the penetration, it would crack there when the item you installed (with pipe threads) torqued the cast iron.

Without the sacrificial anode, any acidic/basic water will quickly rust/corrode the exposed iron and seal the penetrations in FOREVER. You will need to replace the entire heater if you ever burn out the AC heating element, or need to change the pressure relief valve.
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Old 07-23-2013, 09:39 AM   #12
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Quote:
Originally Posted by herk7769 View Post

Turbs.

The reason that the Atwood does not use an anode is that the tank itself is all aluminum and there is no electrolytic action between the aluminum and fresh water.

The Suburbans (most common) have IRON boilers and are porcelain coated all over the insides EXCEPT around the penetrations (drain port, pressure relief valve, electrical element (if equipped), water inlet and outlet ports). If they ran the glass up to the penetration, it would crack there when the item you installed (with pipe threads) torqued the cast iron.

Without the sacrificial anode, any acidic/basic water will quickly rust/corrode the exposed iron and seal the penetrations in FOREVER. You will need to replace the entire heater if you ever burn out the AC heating element, or need to change the pressure relief valve.
Posting on the fly bit me.
Ty lou for catching me.
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Old 07-23-2013, 10:49 AM   #13
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I do believe the Suburban wh have steel tanks, not iron.
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Old 07-23-2013, 01:42 PM   #14
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So it sounds like this anode is an inexpensive replacement. Does it and the drain plug come as one piece, and should I just replace it every year since the plug is off for winterization?
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Old 07-23-2013, 02:33 PM   #15
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So it sounds like this anode is an inexpensive replacement. Does it and the drain plug come as one piece, and should I just replace it every year since the plug is off for winterization?
Yes its one piece.
Yes you could replace it every year.

Mines two years old and is 90% good.
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Old 07-23-2013, 02:39 PM   #16
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Inexpensive in relation to some other RV maintenance, yes.
Cheap no
Just drain the tank(very easy with the spigot) when not in use and you can prolong the life of the anode. Remove for winterization and inspect for possible replacement at that time.
If you are going to replace it every year(generally not necessary), then just go with less expensive combo anode/drain plug.

Ken
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Old 07-23-2013, 10:47 PM   #17
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Originally Posted by OldCoot View Post
I do believe the Suburban wh have steel tanks, not iron.
I thought I read somewhere it was cast iron, but you certainly could be correct.
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Old 07-23-2013, 11:18 PM   #18
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I thought I read somewhere it was cast iron, but you certainly could be correct.
http://www.pplmotorhomes.com/parts/r...ers/801319.htm

Suburban RV water heaters are known for their porcelain lined steel tank and foam insulation that provides for long life. The high-recovery 12,000 BTU/hour units have a large diameter drain and replaceable anode rod. Heated water corrodes most metals, but the porcelain-lined steel tank features a replaceable anode rod that absorbs the destructive, corrosive action of heated water, ensuring that the entire system lasts longer. The anode rod is attached to the drain plug for easy replacement. Both 6- and 10-gallon LP gas units have 12,000 btu/hr input and an efficient recovery rate
of 10.2 gallons/hour. Direct Spark or pilot ignition models offer an optional electric element to recover an additional 6 gallons/hour at the campsite...
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Old 07-24-2013, 09:52 AM   #19
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In the big scheme of things, iron or steel, the anode is critical.
Thanks for reminding me.
Herk
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