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using DHW recirc with on demand heater
i've got a manifolded building which i kind of wish were 3/8" home run because it takes literallly 5 minutes to get hot water to the extremities of the system. the original piping had a half inch gravity return from the old storage heater that worked marginally. have replaced with on demand heater. I can put a recirc pump on that 1/2" return and tee it in at the cold water feed for the heater. Will a standard recirc pump move enough volume to trigger a good sized (180,000 btu) takagi on demand heater?