In a one-pipe system,the same pipe that carries the supply water from the boiler also carries the return water back to the boiler.

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Quizplus · Accepted Answer

In a one-pipe system, the supply and return water both flow through the same pipe, which is why it's called a "one-pipe" system. The water carries heat away from the radiators or other heating devices and back to the boiler, where it is heated and then sent out again.

In a One-Pipe System,the Same Pipe That Carries the Supply