Navien Tankless Hot Water Heater has brown oily fluid inside

We have had the same thing and repairman said the same…They are coming out next week to service the heater…Will let you more when i hear after service call.

Thanks, Frank.

Thomas Glaze NACHI18080215

Hiawasse, GA.

Merry Christmas!!

Oh wait… :stuck_out_tongue:


I am new to this thread but also just noticed the same oily fluid under my heat condenser. Has anyone found the root cause of this problem and a fix. I scheduled a service call but thinking about canceling as it sounds like there is no real fix from all that I have read.