A pressure support system comprising: a patient circuit adapted to deliver a pressurized flow of breathable gas to a patient; a docking assembly having an inlet and an outlet, the inlet adapted to receive the pressurized flow of breathable gas, the outlet adapted to be connected with the patient circuit, wherein the docking assembly includes a tank housing portion; a gas flow generating system that generates the pressurized flow of breathable gas, wherein the gas flow generating system is arranged to be removably connected with the inlet of the docking assembly such that the pressurized flow of breathable gas generated by the gas flow generating system is received by the inlet of the docking assembly, and such that an operative link is created between the gas flow generating system and the docking assembly, wherein the operative link includes an electrical connection to communicate a control signal between the gas flow generating system and the docking assembly; and a tank constructed and arranged to be removably connected with the tank housing portion of the docking assembly such that the tank is disposed between the inlet and the outlet, the tank being adapted to contain a liquid such that a humidity level of the pressurized flow of breathable gas is elevated as the pressurized flow of breathable gas passes therethrough, wherein the tank comprises an upper tank housing and a lower tank housing 190 that are removably coupled to each other, wherein the upper tank housing has a tank inlet and a tank outlet toward a rear end of the tank; and an elevated portion situated substantially to a front end of the tank, the front end being opposite from the rear end of the tank. a patient circuit adapted to deliver a pressurized flow of breathable gas to a patient; a docking assembly having an inlet and an outlet, the inlet adapted to receive the pressurized flow of breathable gas, the outlet adapted to be connected with the patient circuit, wherein the docking assembly includes a tank housing portion; a gas flow generating system that generates the pressurized flow of breathable gas, wherein the gas flow generating system is arranged to be removably connected with the inlet of the docking assembly such that the pressurized flow of breathable gas generated by the gas flow generating system is received by the inlet of the docking assembly, and such that an operative link is created between the gas flow generating system and the docking assembly, wherein the operative link includes an electrical connection to communicate a control signal between the gas flow generating system and the docking assembly; and a tank constructed and arranged to be removably connected with the tank housing portion of the docking assembly such that the tank is disposed between the inlet and the outlet, the tank being adapted to contain a liquid such that a humidity level of the pressurized flow of breathable gas is elevated as the pressurized flow of breathable gas passes therethrough, wherein the tank comprises an upper tank housing and a lower tank housing 190 that are removably coupled to each other, wherein the upper tank housing has a tank inlet and a tank outlet toward a rear end of the tank; and an elevated portion situated substantially to a front end of the tank, the front end being opposite from the rear end of the tank.