Question about Rheem 81VP20S/430157 Water Heater
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.
Open following links shows Rheem anode rods
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.
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Posted on Apr 01, 2011
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Posted on Jan 02, 2017
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