It sure looks like false economy to me. By having to move everything to below the floor(to be able to fix leaks), it won't be as efficient, heat wise. Drastically reducing pumping power will make it harder to purge. The flow loss through a tubing bend is less than using tees. Don't forget too that if your using water, you'll always have air being introduced into the system either through make up water or just from the water it self. Calcs are fine but sometimes real world works differently for some reason.
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