Take the 2-minute tour ×
Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. It's 100% free, no registration required.

What might cause slight corrosion atop a tankless water heater's copper topped element assembly?

I checked all the grounding and reconnected the two element assembly grounding wires and ensured proper tightening. Then, I checked the grounding wire from the tankless unit to my breaker box. I then switched this ground wire from the neutral bar to the grounded bar. There is absolutely no bonding/grounding to a water pipe! I cleaned off all the corrosion.

Could the loose ground wires have caused the corrosion? I began the grounding issue because I discovered a faint pale green stain in one bathroom sink and suspected electrolysis. I have a whole house water processing system installed. I called the manufacturer but, was placed on hold for over 20 minutes. I eventually hung up.

share|improve this question
    
My apologies, if i used incorrect terminology and/or failed to put info in the proper sequence. –  RAE CLARY Aug 15 '13 at 18:59
1  
Pictures are always helpful. –  Tester101 Aug 15 '13 at 19:29
    
What is a copper topped element assembly? Is that inside or outside the unit? –  wallyk Aug 16 '13 at 3:40

1 Answer 1

There are any number of things that could cause corrosion: - leaks or other water on the corroded surface - grounding or some other electrical field - ambient corrosive elements in the air (water, overspray from other projects)

I think you did the right thing by checking and fixing your grounds. That might not be the root cause, but it doesn't hurt to have everything properly grounded.

Does your water heater have a sacrificial anode? They can be somewhat tricky to inspect and replace but if its old and used up then corrosion might attack other parts.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.