I'll be plumbing an econoburn 100 to my existing supply/return headers off my oil boiler. However, these headers are 1" sch. 40 with 3/4" zone lines. The headers themselves are about 16" in length and I'll be adding a piece to loop the headers together to make the primary loop for the econoburn. I see many diagrams using 1-1/4" for the primary loop. In addition, after doing some research, 1" is good for about 70k+/- BTU/Hr. Should I replumb the supply/return for a complete 1-1/4" loop?