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I have a newly installed indirect hot water heater and two of the pipes are showing significant amounts of corrosion.

Given that the installation is only 3 months old, I suspect that there may be galvanic corrosion involved. How can I test this and see if electricity is getting into the piping system and causing galvanic corrosion?

  • Check the anode inside your thank, in your case I suggest you to get an electronic one: it never cunsumes itself and prevent corrosion – DDS Feb 28 at 15:45
  • Picture of the connections would help. – Jim Stewart Feb 28 at 15:45
  • Galvanic corrosion isn't the result of external electricity getting into the system. Instead, it's a phenomenon that happens simply because two dissimilar metals are touching one another. A small voltage is produced right there at the joint; it's a lot like a battery. The severity varies depending on which metals are present. – Greg Hill Feb 28 at 16:28
  • If you see corrosion on the surface of the pipe ,it sounds more like small water leaks. – blacksmith37 Feb 28 at 16:52
  • As @GregHill implies, if you have iron pipe meeting copper, that would cause galvanic corrosion -- though most would be inside, where you're unlikely to see it. – DrMoishe Pippik Feb 28 at 23:19

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