Potential Mixed Metals/Electrolysis issue?

[michio Marcus Ohno]

We had a new tankless hot water heater and recirculation pump installed a few years ago. Everything works great and no leaks. However, I was watching Holmes and the issue of mixed metals in plumbing systems causing corrosion and failures was brought up. This made me think of our setup and wondering if we had a potential problem down the line. As you can see in the pictures, there is some brass, some stainless, and some copper. Thank you for any input

 

[Terry]

Copper and Stainless work well together. Also, corrugated supplies are dielectric already. No worries.

 

[Sponsor]

 

[Reach4]

Some would be disturbed that your temperature & pressure relief valve empties even a little bit uphill, or that your "3/4" inch stuff does not keep the full diameter.

Others are not bothered by that stuff at all.

 

[Terry]

Some would be disturbed that your temperature & pressure relief valve empties even a little bit uphill,

I don't run T&P lines with flex. I used to though.
I also always gravity them downward. No loops going up. And the other day I pulled out a 6"galvanzied nipple from a T&P and it was nearly filled with rust.

 

[michio Marcus Ohno]

Thank you very much for your responses. I'm really glad I don't need to worry about it.