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I would like to get some opinions on the best way of controling a domestic hot water return pump in an apartment building. Obviously constant circulation is not the right way, I know the Buderus wall hung boilers are preset to run at 3 minutes every hour, I'm not sure if thats enough, the only other way I know is with an aquastat strapped to the pipe, that will run the pump if it goes below 110 - or whatever you set it at.