It is 5/8 ID. 5/8 is 40% more volume over 1/2 so the amount of heat it carries should be proportional and would there not be less resistance in larger tubing of shorter length? Does the pump pressure come from the added weight of the greater volume of fluid in loop? The solid copper ring crimps I can get free but I read many favor the ring clamps and there are many varying opinions out there. Free is not always the best choice if it doesn't accomplish what you want but is attractive to me if it can be adapted to work. Being creative DIY and resourceful with materials has got me far more than I could afford otherwise.
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