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How to replace a magnesium rod on a John Wood electr. water tank?

My old one is all correded and falling apart?

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You can buy these at any good hardware store- two types- Aluminium and manganese- if you replace and have a odor from water remove and replace with other. Really easy to do. Turn off water pressure to tank . Drain pressure at lowest tap in house. Put hose on drain spiggot of tank and drain off 1-2 gallons .Turn off electrical to tank. Unscrew old with socket- yes socket - do not use a pipe wrench.You will need a power bar Or good solid ratchet to remove and reinstall. Apply a pipe dope or teflon tape to new and srew in place- wrap tape counter clockwise or it will spin off as you turn in place and it will leak. Do not drain tank completely - you require this weight to keep tank from spinning as you remove and reinstall. After tightening slowly put pressure back on system - never shock pipes etc.Just as you do not slam your brakes- don't slam your pipes,Turn power back on after checking for leaks -tighten as required. Double check spiggot after removing hose as dirt can sometime cause a slow leak- monitor all areas for at least 3-5 mins and then check again at end of week. Also know that the lifespan of a tank should max at 15 yrs after that - replace or accept the flood when it happens. Good luck at poat me if you need me. Allen

Posted on Dec 01, 2008

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I am looking for a magnesium anode for a Rheem natural gaz water heater PV75


There are two types magnesium anode.
1) Hex-head that screws into separate port on top of tank, and comes either 44" long or 12" sausage links.
2) Combo-anode that connects to Hot water nipple, and comes in solid or combo.

Contact guys at following link to purchase anodes
http://www.waterheaterrescue.com/pages/WHRpages/English/OrderPages/XCart/sales-through-XCart.html

General instructions and types of anodes
http://waterheatertimer.org/Replace-anode-rod.html

Rheem 'preferred parts'
http://waterheatertimer.org/pdf/2011_Rheem-anode-rods.pdf
Purpose of resistorized anode is supposedly so magnesium performs as well as aluminum.
Rheem however had 'resistorized elements' years ago, and that turned out to be promotional gimmick so people would buy rheem-brand products.

Nov 02, 2012 | Protech Rheem/Ruud SP13901B - Anode...

1 Answer

What type of anode rode for a 30 gal. electric intertherm water heater?


Contact Tank forum, and post same question.
They are anode experts and sell correct anode of high quality magnesium.
They sell the longer-lasting anodes, and are good guys to know:
http://www.thetankatwaterheaterrescue.com/forums/forum3/

Oct 06, 2012 | Water Heaters

1 Answer

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.
Pull insert out since it will cause clogs.
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/
Tank will recommend magnesium anode and not aluminum.

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.

You can configure pipes to make heat traps that save save $2-4 per year on gas water heater operation.
http://waterheatertimer.org/images/Heat-trap-install-900.jpg
http://waterheatertimer.org/How-to-maintain-water-heater.html

Sep 08, 2012 | Water Heaters

1 Answer

What is the purpose of the magnesium rod inside the water heater (bock)


These anode rods, sometimes made from aluminum, prevent corrosion. The rod emits ions that line the tank and help prevent corrosion. The rod isn't solid magnesium or aluminum; it has an iron core. If your hot water smells of sulfur (rotten eggs), the anode rod has gone bad or there is a presence of hydrogen sulfur gas that is overwhelming the rod. Usually replacing the rod will stop the odor, but sometimes chlorination of the tank is necessary.

Oct 25, 2011 | RTO Bock Water Heaters 32E 32 gal 104,000...

1 Answer

I have a Reliance 501 electric water heater ... Everything works great but below the water out. Be rusty? How can I fix it?


The tank is rusting. Replace anode rod or replace water heater.
Once the anode rod depletes, then the tank starts to rust.
IF you can replace the anode rod, it will stop rusting, and then flush the rust out of water heater.
This might buy more life with same tank, but old anode rods are pretty solid and even impact wrench might not loosen it up.
http://waterheatertimer.org/Replace-anode-rod.html
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html#flush

Loosen anode rod on new tank before installing, and then inspect every 1-3 years, and 1-2 years if water is softened.
Add a comment for more help.

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Jun 08, 2011 | RELIANCE ELECTRIC WATER HEATER

1 Answer

Our 40 gal Rheem gas hot water tank is almost 3 years old. We have a well for water supply and a 2 year old Paterson Iron Remover plus newer water softener. Suddenly 3 weeks ago the hot water developed the...


I would have to go along with your brother on this one. The aluminum anode rod is by far the cheapest way to go. Other options include extensive filtration,ozone treatment and acid treatment.
The aluminum anode rod is much cheaper and I would recommend you change it yearly at least. Good luck and thank you.

Feb 22, 2011 | Rheem Water Heater Anode Rod AP12938

1 Answer

Tried to take a bath last night and black sediment came out after almost filling tub. I drained some water out of the hot water tank this am. Some more sediment came out and then ran clear. Both elements...


If the heater is that old and you have not changed the anode rod over the years then the chemicals in your water are eating at the tank metal and it will soon fail. A twenty year old tank is so inefficient compared to the new ones that it would pay you to replace it now anyway.

In short YES to your question.

Feb 06, 2011 | Rheem Water Heaters

1 Answer

How do I Remove Magnesium Anode ?


The following page has instructions and a link to a video:
http://waterheatertimer.org/Replace-anode-rod.html

How to:
Rods are installed in top of tank.
Most are located under a 2" round plastic cover located on top of tank.
Some anode rods are connected to hot water nipple
Read owner's manual to see location of anode rod
See list of water heater manufacturers and brands to find product manual.
Before starting, turn off heater source: electric water heater: turn off circuit breaker; gas water heater move control knob to pilot.
Close shutoff valve on cold water side of water heater
Open bathtub faucet to relieve pressure and let air into water line.
Open drain valve near bottom of tank,, and drain 2 gallons of water.
http://waterheatertimer.org/Water-heater-will-not-drain.html

Use 1-1/16" socket for hex head rod
Rod will be rusted in place, use generous amount WD-40
WD-40 spray is flammable and will burn so be careful around heat source.
Loosening rod: go slow and check that water does not seep up when loosening rod because hot water can spew out hole if tank is very hot ... it is important to drain enough water out of tank to avoid accidental scalding.

Install new anode rod: One source says/ use pipe compound on thread instead of teflon tape. Other sources say use teflon tape. Either way, tank metal and anode metal must meet, so rod will work.

Dec 23, 2010 | Water Heaters

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