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Another thought is to use a FIP connection like this with the rubber washer that would probably protect the exposed steel. I could see this rubber wearing down over time though and causing problems. Well, except that this is stainless. Would want brass...

Seeing pictures from this post earlier this month https://terrylove.com/forums/index.php?threads/heat-trap-on-new-rheem-hybrid-water-heater.103209, it looks like Rheem has not addressed this issue with their crappy "dielectric" nipples on newer tanks. With install of my new one this week, I'm...

Ugh, not happy to see these nipple pictures. I have a replacement Rheem hybrid being delivered on Monday. These "dielectric" nipples are NOT DESIGNED WELL. See these threads about the corrosion you can expect because the plastic stops before the end of the pipe and does not expand out to...

Another update. Our heater control board got hit by an electric surge we think, but Rheem doesn't have any more boards so I am having to replace the ENTIRE heater instead of a 5min board replacement, ugh. Anyway, I found the source of my problem and it's BADLY DESIGNED DIELECTRIC NIPPLES. My...

Just wanted to chime in that I had the exact same issue as you for a while after installing my tank 4 years ago. After a while it eventually stopped I guess as the end of the nipple was not exposed to enough electrolysis, maybe because enough crud prevented the water from allowing it to happen...

Quick update here. I actually ended up doing nothing at all and it has gone away. Each time we left for a trip the color was lighter, and we just got back from another 10 day trip last night with no color at all when first running it. It's been about 1.5yrs since we installed the heater, and I...

I will go ahead and check it. Thanks for the recommendation.

No, I have not. Heater was brand new when installed in Feb. I would expect the anode to take at least 5+ years to degrade even in bad situations, right? I never replaced it in our old heater and it was at least 15yrs old.

Thanks for the additional suggestions. From the diagrams I've seen of HPHW tanks, the coils for the condenser are always at the bottom of the tank. Either around the outter edge or the middle. Here is an example...

Correct. Both come out the side, and they were regular straight through nipples, not heat traps. Cold input is at the bottom of the tank, and hot is at the top (and manufacturer says it's a J style nipple on the inside so that it gets the hottest water from the top of the tank).

Good idea with the spigot on the hot water output. That could confirm a shorter distance to the issue. The closest faucet is a bathroom probably 20 linear feet of pipe from the heater. The problem appears at every hot water faucet in the house. If I let the yellow water out of that closest...

Happens on every faucet around the house, which have all but 1 been replaced within the past 5 years. So I don't believe it has anything to do with faucets. Same timeline for getting yellow water for each faucet as well, with the only different in time being how far the hot water has to...

There is no yellow from cold at all.

We replaced our hot water heater back in Feb of this year. Upgraded from standard GE elec to a Rheem 50gal heatpump. Could not do gas due to location. LOVE the heater with wifi monitoring, sensors and especially the crazy low energy use (especially now that we have solar panels), however...