I have a question in regards to my pressurized storage pipeing. I have three tanks, pressure vessels in my basement directly below my attached garage. The tarm solo 60 is located in the garage above the tanks. The tanks have two threaded fittings on the top of the tank to support 1.25" pipeing. They also have a threaded fitting on the bottom 16" to support 1.25" pipeing. I had my plumber over today and was explaining to him that I wanted hot water coming in at the top and hot water going out at the top. Return water would then be from the bottom fitting. I wanted to do parrallel plumbing of the three tanks. I was planning on seperate parrallels for the hot in and hot out. He stated that it is very difficult to do parrallel with three tanks because its difficult to keep all the same lengths in 3 tanks vs 2 tanks being easy. He wants to plumb in Reverse Return in which first tank in hot is last in return cold. This method would eliminate a full row of pipeing , valves, fittings, etc. The Solo 60 is bigger than I need. My storage equals 1140 gallons. I have three zones, one high temp fan coil, one DHW, and ond low temp radiant. Can I assume the double top piping is strictly for BTU transfer when a zone is calling for heat, or should I do what he is saying and just do one row of pipeing. I already have the fittings, I just want to do it right can anyone help?