overcome excess edr. See attachment. Steam guy doesn't want to replace pipes with larger pipes, feels it's too invloved, suggests re-routing lateral B off branch to new branch off main. Connected EDR to current branch(A) is 82, the laterals are 3/4" except for C which is 1". By doing so connected EDR to A would be reduced to 44, with 38 connected to propose piping. Reason for seeking a fix is that only rad off C heats well at all times, other 3 will heat together if valves on rads off B are opened slightly, and rad on D opened all the way, however, rads off B will heat minimally, and D slightly better. If the rad off B are opened more, then D doesn't heat. Any feedback appreciated.