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Calculating Head Pressure loss
Hi, I am trying to figure out what size circulator pump I need for a heating system install. When calculating head pressure on a system with zone valves, do I consider the longest run in a zone as well as the supply and return lines from the boiler? For example, I have total supply and return line length at 208 ft and one of my five zones has a run of 145 ft. Please let me know as I don't want to buy the wrong circulator.