I replaced my gas water heater a couple weeks ago with a new 40 Gal Rheem Performance. It has been working great. The TP relief valve is plumbed through an exterior wall and dumps out near a back door. A few days ago, I noticed a small amount of moisture on the concrete under the pipe, which dried up and hasn't reappeared. I checked the TP relief valve and it appears to be functioning correctly and is not leaking.

My question: I assume it operated as designed and opened briefly to relieve pressure inside the tank, but is this something I need to be worried about? Should I turn down the temp or is there anything else I should do? TIA

Unless you have update news, no worries
and if the exting pipe is metal, assume condensate from a humid environment is also suspect

Raising WH temps would exacerbate the problem but 40g IS smallish so justififed when we all have to multi-task these days, demanding more from appliances then they rest for hours-hours.

Thanks. It hasn't happened again, so I'm not worried about it. The exiting drainpipe is PVC, so I wouldn't expect a condensation issue, but I hadn't thought about that.