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 water heater nipple corrosion
Author: sum (FL)

I have a Bradford White water heater (2 years old) and I noticed a problem.

The hot water coming out of the heater is connected to a copper pipe using a copper/brass? union. There are two nipples coming out of the heater on top, one connects to hot water out and one connects to cold water in. There is a valve on the old water pipe.

The union that connects the hot water nipple and the copper pipe is corroded. It has turned party green and it has also caused part of the "top" cover area around the nipple to be a little rusted. I don't know how much time I have before it breaks. The problem is, the union will be hard to remove, the part you can apply an adjustable wrench to turn it is the corroded part and will not take any stress.

I assume all I need to do is to shut off the cold water valve. Then try to unscrew the hot water union (if possible), then take that union to a plumbing hardware store and get a replacement? or is there more to it? Do
I need to shut it off?

MC

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 Re: water heater nipple corrosion
Author: JDC04 (KY)

yes you should remove the union and replace it with a dielectric union. that way you are not connecting two different metals directly to each other.

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 Re: water heater nipple corrosion
Author: e-plumber (NY)

"I have a Bradford White water heater (2 years old) and I noticed a problem.

The hot water coming out of the heater is connected to a copper pipe using a copper/brass? union. There are two nipples coming out of the heater on top, one connects to hot water out and one connects to cold water in. There is a valve on the old water pipe.

The union that connects the hot water nipple and the copper pipe is corroded. It has turned party green and it has also caused part of the "top" cover area around the nipple to be a little rusted. I don't know how much time I have before it breaks. The problem is, the union will be hard to remove, the part you can apply an adjustable wrench to turn it is the corroded part and will not take any stress.

I assume all I need to do is to shut off the cold water valve. Then try to unscrew the hot water union (if possible), then take that union to a plumbing hardware store and get a replacement? or is there more to it? Do
I need to shut it off?"

>Bradford White water heaters come with nipples on top that act as dielectric fittings. Your problem appears to be external corrosion most likely from a leaking fitting.
Shut the gas or power supply and the CW, drain part of the tank, cut out the corroded fitting and replace it. If you're going to take apart the union, use two wrenches, one to hold back.

e-plumber



e-plumber
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"The society which scorns excellence in Plumbing as a humble activity and tolerates shoddiness in philosophy because it is an
exalted activity will have neither good Plumbing nor good philosophy: neither its pipes nor its theories will hold water." -
John William Gardner 10/8/1912 - 2/16/2002

Repair your leaking Plumbing fixtures ASAP [www.theplumber.com]
This slow drip will waste 7+ gallons of water per day.

Post Reply

 Re: water heater nipple corrosion
Author: Anonymous User

Don't worry about this surface corrosion, I see this all the time even on some new houses with very damp basements.

The only time I would be concerned is if water was leaking from a pipe joint, and don't mistake any condenstation for a leak.

Condenstation can cause alot of suface corrosion such as green copper or some rust on a metal pipe thread which is harmless.

If you are still real concerned call a licensed plumber that does alot of service work in your area and have him take a look at it, it could save you money and alot or time and trouble if you were to start taking things apart when you don't need to.

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 Re: water heater nipple corrosion
Author: jjbex (IL)

The first thing I do on w.h. installations is to remove the factory installed dielectric nipples. I use brass nipples to copper flexis, or copper unions. The only time I keep the dielectric nipples is if the water pipe is galv.


Peace out,

Kordts

Post Reply

 Re: water heater nipple corrosion
Author: e-plumber (NY)

"The only time I keep the dielectric nipples is if the water pipe is galv."

>Or if the dip tube is attached to the cold side nipple...

e-plumber



e-plumber
-----------------------------------------------------------------------------------------------------------------------------------

"The society which scorns excellence in Plumbing as a humble activity and tolerates shoddiness in philosophy because it is an
exalted activity will have neither good Plumbing nor good philosophy: neither its pipes nor its theories will hold water." -
John William Gardner 10/8/1912 - 2/16/2002

Repair your leaking Plumbing fixtures ASAP [www.theplumber.com]
This slow drip will waste 7+ gallons of water per day.

Post Reply

 Re: water heater nipple corrosion
Author: jjbex (IL)

I bought 10 diptubes acoupla years ago for a coupla bucks each:) I still have 6 or 7 left. That's what they are used for, if the cold nipple has an attached dip tube, it still gets thrown away:)


Peace out,

Kordts

Post Reply





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