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Steve thanks for your input i do appreciate it. If I have say a Triangle Tube TriMax 110 with the built in circulator for the primary loop, and I know this may be out of your preview what do you think is the consequences of the boiler firing at low fire with the 007 circ that is on the boiler for the primary pump. if i have only one 20,000 btuh zone calling and have a gpm internal to the boiler that is pumping to the 110,000 btuh is there any deficit in efficiency. Would it make sense for the boiler to control the internal boiler speed of the pump to accommodate the boiler fire rate? I'm tossing this out there as I do not know the answer but am inclined to ask the question. Thanks Matt