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I HAVE TWO ADD'L RADIATORS HOOKED UP TO THE EXISTING BOILER HEAT SYSTEM AND THERE IS A PUMP HOOKED UP TO THE COOPER PIPE LINE GOING TO THE ADD'L RADIATORS. ONE RADIATOR WAS HOOKED UP IN THE BASEMENT AND ONE WAS HOOKED UP ON A CLOSED IN PORCH.IF MY EXISTING BOILER CAN PUMP THE HOT WATER ALL THE WAY TO THE THIRD FLOOR OF MY HOUSE, SHOULDN'T IT BE ABLE TO PUMP THE HOT WATER TO THE ADDED RADIATORS WITHOUT THE ADDED PUMP. ANY THOUGHTS????