Rob R. wrote:grumpy wrote:Rob, are those for the boiler or for well water, and why two?
They are both on the boiler. One wasn't enough to keep the pressure stable. The oil boiler originally had a steel compression tank up in the ceiling joists, but that was replaced at some point. Whoever did the work installed an Extrol in its place. When I bought the house that Extrol was water-logged, and I read that the tanks shouldn't be on their side. Without a lot of repiping, it was easiest to mount them on the floor. Each tank sits on a 6" PVC coupler to keep it off the floor. Now that I am a few years wiser...I should have just bought a commercial floor mounted Extrol tank.
When you price that commercial tank, you will figure out that your current installation is just fine.
Valves are a must on the expansion tank in my book.