I found if its closed system than only I need expansion tank.
But how do I know if I have closed system?
At the main in the front where digital meter is ..I have shut off valve ( where I have to use big metal T )
what else I need to check ?
at that main where meter is ..accept meter I don't see anything else
But how do I know if I have closed system?
At the main in the front where digital meter is ..I have shut off valve ( where I have to use big metal T )
what else I need to check ?
at that main where meter is ..accept meter I don't see anything else