Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Question for Mark Eatherton
Mark, in a separate thread discussing my parallel reverse return system, you said:
"So, looking at it on the beginning, your supply would be 3/4" and the beginning of the return would be 1/2" because it is only carrying the flow of one radiator. Once the return picks up the second radiator, then it can jump to 3/4" because it is now carrying the flow of two radiators, Once you get to the second to the last radiator, the supply would drop to 1/2", again because it is only carrying the flow of one radiator, but the return stays 3/4" all the way back to the mechanical package."
My total supply main is 116 feet in length from boiler to last emitter (excluding branch emitter supplies). The distance from the next-to-last emitter is 40 feet, or about 36% of the entire main supply length. In my situation would you still recommend stepping down that last 40 feet from 3/4" to 1/2"? Would doing this add significant resistance, causing excessive head loss to the upstream supply?