OK this is great input yet again. regarding balance, if all three loops are handling equal load, I am getting the most possible out of my field. Great article and I will humbly walk down to my basement and start plumbing it in. In my profession there are many instances where it is easier to say "that is the way it works" and it really does work. Thanks again. There is an accessory listed for my Gelologix unit called a modulating valve kit. seems like a good idea as it adjusts flow according to the furnace load. Will these work with non pressured systems and is it a good investment? Honestly if the heat wasnt on with winter approaching, I would really enjoy this project. I am intently hoping my system works great and it is all worth it. this whole field is extremely cool (puns intended). Again, I appreciate your expertise!!! Thanks!