A plate heat exchanger, which is a two-pass domestic-water plate heat exchanger for an intermediate feed arrangement of a district heating system, wherein the heat exchanger has a first side and a second side, and wherein heat-transfer plates form a plate stack, and wherein a first end plate is provided on the first side of the plate heat exchanger and a second end plate is provided on the, relative to the first end plate, opposite second side of the plate heat exchanger, to which plate stack at least six ports for pipe connections are connected: - a district heat inlet port, by which hot district heat is conducted into the plate heat exchanger, located on the first end plate, - a hot water port, by which hot water is conducted out of the plate heat exchanger, located on the first end plate, - a hot circuit water port, by which hot circuit water returning from the domestic water circuit is conducted into the plate heat exchanger, located on the first end plate, - a district heat return port, by which cooled district heat is conducted out of the plate heat exchanger, located on the second end plate, - a cold water port, by which cold water is conducted into the plate heat exchanger, located on the second end plate, - an intermediate feed port, by which the district heat return water of the heating circuit is conducted into the plate heat exchanger, and wherein, on the first side, the district heat water is received from the district heat inlet port to heat preheated domestic water received from the second side and hot circuit water received from the hot circuit water port and, on the second side, the district heat water is received from the first side to preheat cold domestic water received from the cold water port, wherein the intermediate feed port is located on the second end plate on the opposite side of the plate stack of the plate heat exchanger relative to the hot circuit water port, and the intermediate feed water is received from the intermediate feed port to preheat cold district heat water received from the cold water port only on said second side of the plate heat exchanger. - a district heat inlet port, by which hot district heat is conducted into the plate heat exchanger, located on the first end plate, - a hot water port, by which hot water is conducted out of the plate heat exchanger, located on the first end plate, - a hot circuit water port, by which hot circuit water returning from the domestic water circuit is conducted into the plate heat exchanger, located on the first end plate, - a district heat return port, by which cooled district heat is conducted out of the plate heat exchanger, located on the second end plate, - a cold water port, by which cold water is conducted into the plate heat exchanger, located on the second end plate, - an intermediate feed port, by which the district heat return water of the heating circuit is conducted into the plate heat exchanger, and wherein, on the first side, the district heat water is received from the district heat inlet port to heat preheated domestic water received from the second side and hot circuit water received from the hot circuit water port and, on the second side, the district heat water is received from the first side to preheat cold domestic water received from the cold water port, wherein the intermediate feed port is located on the second end plate on the opposite side of the plate stack of the plate heat exchanger relative to the hot circuit water port, and the intermediate feed water is received from the intermediate feed port to preheat cold district heat water received from the cold water port only on said second side of the plate heat exchanger.