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I am building my own system that will include a boiler loop, a Tekmar 361 controlling a variable speed injection pump, and a heating loop. The heating side will have a home run manifold setup, and each cast iron radiator will be controlled by a TRV. Pumps will always be running during cold weather. I understand that I will need a differential bypass on the heating loop to reduce flow to the radiation circuits as TRVs close (and I am sure there will be periods when they are all closed), but I got to wondering how a Taco delta T pump might work in the heating loop so the pump isn't running full out all the time. Then I got to wondering how the delta T pump and a differential bypass might interact with each other. Would these two components fight each other some how?