Thanks for this question as I've got the same issue.
Changed the hot water tank pressure relief valve on the tank approx 4 weeks ago. The problem continues with seepage from the hot water tank witness line.
Sometimes it leaks and sometimes nothing but this question caused me to dig further.
So after changing the relief valve with no luck, now I'm ready the change the tank - so off to Home Depot today to shop for a new tank - 40 gallon gas tank is $375 (6 year tank).
"Charlie" in HD plumbing asks what up - I mentioned the irregular water seepage after much hot water usuage - he asked when was the pressure regulating valve last changed? I added it approx 10 years ago but Charlie was persistant and told me to find a pressure gauge to be used on an outside faucet. $10.50 later for the gauge, I go home and tested the house pressure. Sure enough 110 psi - street line pressure! Get on the internet to learn how to adjust this thing as the PRV valve instructions were lost 9 years and 364 days ago - find the instructions - adjusted the valve until the cows come home - still 110 psi at the gauge - back to Home Depot for a replacement PRV and I installed it in 45 minutes - this time I didn't have to sweat fittings - just a mechanical install - get it installed and turn the water back on - the house pressure is now at 50 psi.
Will advise if this is the final fix (I don't trust that sneaky little booger). Just checked the overflow pipe - so far so good. I do admire HD staff for not instantly selling me a new tank. Thanks to all (especially my Dad who taught me how to do plumbing when I was kid). I'll update after about a week after watching that darn drain line.
Later but again thanks for posting this thread.
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