I currently have a conventional vented CH system. If I want to convert the flow/return/primaries circuit to a closed/sealed system, do I need to be qualified?
I'm aware that you need a ticket to change the cylinder to unvented, but I will be leaving the cylinder as vented for now.
I'm aware that you need a ticket to change the cylinder to unvented, but I will be leaving the cylinder as vented for now.