I'm in the process of installing a vigas 40 with 1000 gallons of storage and I am starting to run out of space and I am trying to find a spot to put my two extrol 110 expansion tanks.... I was planning on running a 1/2" copper line off of my air separator which is mounted directly above the boiler itself. Is there a limit to how far away from the boiler the expansion tanks can be? I would like to place them about 20 feet away if possible...