13,000 BTU/HR is the amount of pipe that is 1.3 GPM. 35,000 BTU/HR is the equivalent of 3.5 GPM. 75,000 BTU/HR is the number of gallons of 1′′ pipe. 12 gallons of pipe is equal to 120,000 BTU/hr. 200,000 BTU/hr is the pipe's diameter. 450,000 BTU/HR is the amount of pipe that is 45 GPM.
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