I am piping out a hot water condensing boiler that has its own boiler loop and circulator pump aside from the heating system loop and circulator pump. The manufacturer supplied a recommended circulator pump for the boiler loop which is sized for "50 ft. of equivalent length of pipe". The instuctions go on to say that it may require a higher flow circulator pump if you pipe it out more that "50 ft. of equivalent length of pipe". It then gives a chart of how much each fitting and valve is equal to as a length of pipe. My question is, do i size the circulator pump just based on the fittings and valves equivalent length, or do i also add up the amount of actual pipe in between each fitting and valve to come up with the amount? Please help, im not understanding this. And since it is a condensing boiler with a small heat exchange it is important that it has the correct flow and doesnt overheat so i dont want to ruin it. Thanks guys for any help.