The invention relates to a CPAP apparatus comprising: a blower configured to provide breathable gas and an apparatus for humidifying breathable gas, comprising: a humidifier housing with a receptacle and a humidifier body configured to be removably received within the receptacle, the humidifier body having an interior configured to retain a body of liquid therein to humidify the pressurized breathable gas, the humidifier body comprising: a top cover a base configured to retain the body of liquid and a gasket between the top cover and the base, the top cover being configured to cover and seal with the gasket to sealingly enclose the interior of the humidifier body.
