A peritoneal dialysis system includes a water purifier, a cycler, and a disposable set operable with the cycler. The disposable set includes a pumping cassette including a water inlet port, a heater/mixing container in fluid communication with the pumping cassette, a water accumulator, a first water line segment, and a second water line segment. The first water line segment is in fluid communication with the water inlet port and the water accumulator. Additionally, the second water line segment is in fluid communication with the water accumulator and the water purifier.