Question about Rheem 81VP20S/430157 Water Heater

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Where is the anode rod located on the rheem 81VP20s

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Anodes are located on top of water heater.
There are no hard fast rules for location, either by model number or brand.
Most times the manual is likewise vague.
1) There is hex head visible on top of tank.
2) Hex head is located under a plastic cover
3) Hex head is located under metal top, so remove screws holding top, and lift top off to view hex head
4) Anode is connected to hot water nipple.
5) With 9-12-15-and lifetime tanks, you can have 2 anode rods, and each has to be made of same material to work properly. Usually magnesium-aluminum instead of aluminum.
But if you inspect and change anodes frequently to prolong life of tank, then one is as good as the next.
http://waterheatertimer.org/Replace-anode-rod.html

Open following links shows Rheem anode rods
http://waterheatertimer.org/pdf/Rheem-Ruud-anode-rods.pdf
http://waterheatertimer.org/pdf/Rheem-Ruud-water-heater-parts-guide.pdf
Tech resistor anode rod has resistor added to prolong life of anode.
You can cut rod off to fit size of tank. You want anode 5-6" from tank bottom so sediment build-up doesn't reach anode.
Anodes are standard 1-1/16" hex head.
http://waterheatertimer.org/images/Water-heater-anode-006-200.jpg
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html

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Posted on Apr 01, 2011

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http://waterheatertimer.org/Replace-anode-rod.html



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Contact guys at following link to purchase anodes
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How to how to install the anode rod - for extended warranty - in a new Rheem waterheater?


You are installing a combo anode rod that replaces hot water outlet nipple. This means you will have 2 anode rods, which doubles the anode capacity of tank, which can cause extended life of water heater, assuming that both anodes are inspected each 2-5 years.

Sounds like a heat trap insert is in the way.
Look at parts sheet that comes with product manual.
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Same insert is on cold side nipple.

I want you to contact the Tank forum since they are anode experts:
http://www.thetankatwaterheaterrescue.com/forums/forum3/
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My understanding is that Rheem water heaters are made so only Rheem brand anodes fit their tanks. While other companies use generic anodes that are sold at any plumbing supply, and also sold at Tank website.

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http://waterheatertimer.org/images/Heat-trap-install-900.jpg
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Where is anode located mdel no. 82yp30-1


Question posted under Rheem water heater.
Model number does not describe water heater.
Model number posted in question does not appear at Rheem, and does not appear in a web search for water heaters.
Here are options:

1) Add a comment and describe water heater in detail so expert can access more information

2) Contact Rheem.
http://www.rheem.com/Contact.aspx

3) If this is tank-type water heater, the anode is located on top of heater.
Look for 1-1/6" hex nut located under a plastic plug.
Some anode rods are connected to the hot-water nipple.
Sometimes the top cover has to be removed to find anode hex nut.
I have used impact wrench on anode, and could not remove in some cases.

4) More resources:
http://waterheatertimer.org/Replace-anode-rod.html

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Anode rods are generic and available from local plumbing supply store or internet.
Just cut it off so it drops into the tank without touching the bottom or sediment on the bottom.
If there is not enough room above the tank to install new rod, then buy anode rod with sausage links.
http://waterheatertimer.org/Replace-anode-rod.html

Open following link for Rheem parts: page 7 shows anode rods
http://waterheatertimer.org/pdf/Rheem-parts-list.pdf

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1 Answer

Where is anode rod located on 100 Gallon rheem water heater natural gas


Anode rods for tank-type water heaters are located on top of tank.
This is true since anodes are about 44" long.
Top of anode is standard 1-1/16" hex nut.
Anodes can be located in 2 different places: either directly screwed into top of tank -or- attached to hot water nipple.
Most times the exploded parts diagram in manual simply shows 'anode rod' without specifing exact location. If your tank has long warranty, then it can have two anode rods, and 1 will be on top and the other probably attached to hot water nipple, or there could be two anodes screwed into top of tank.
http://waterheatertimer.org/Replace-anode-rod.html

If anode is screwed into top of tank, then it will be under a plastic cap -or- it will be concealed under the top cover of tank.
Look for plastic cap, and if none shows, then remove screws holding down metal cover and look there for 1-1/16" hex nut.
Lastly, remove hot water nipple and check for anode located there.
If you have 2 anode rods, then replace with same metal for each.

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

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I suggest replacing the whole water heater instead of just the rod. Usually the water is at the end of its useful life it the rod needs replacing. You will probably need to do that soon anyway. However, if you do replace it and have no head room, you will have to totally disconnect the heater, lay it on its side to do the job. (might as well replace the unit if you are doing all that work.)

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