My 12 year old water heater is corroding where the copper lines are screwed directly into the steel heater. This was done by a plumber when the house was built. I look on youtube and all I see are videos of how to do it wrong. I am ready to install a new water heater and I want to do it right. My confusion is with the steel nipples and dialectric unions. The steel nipple has a plastic liner and will be screwed into the tank. The plastic liner wraps partially over each end. I also have unions to be sweated (or I can get shark bite ones) on the copper side with steel threaded on the tank side. There is a fiber washer in there. The problem is this. The female side of the union has very deep threads and the plastic inside the nipple will in no way seat against the union. Water WILL get under the plastic liner. I do not see what good the plastic liner does. Can I use brass nipples instead? I am afraid the warranty will be void if I do not use the plasic lined nipples. Confused?
No announcement yet.
Water heater install with copper lines who is right?