Breathable gas apparatus with humidifier

A breathable gas supply apparatus for treatment of respiratory disorders including a flow generator with an air inlet on a rear wall, the air inlet configured to provide a supply of ambient air to a blower of the flow generator; a water container with a first air opening (716), a second air opening (801), a top portion, a side surface having the second air opening therein and a bottom portion, the bottom portion having a heat conducting surface, the water container including a tub (698) to contain water and a tub lid (700) pivotably moveable relative to the tub, the first and second air openings being located on the tub lid, the water container including a tub seal (699) between the tub and the tub lid, the tub lid having a sloped surface to direct airflow downward towards the bottom portion of the water container; a base (rear cover 803 and front cover 602) with a heater (plate 632 with ceramic heater pad 800), the base being configured to receive the water container; a base lid pivotably attached to the base, the base lid having a locking mechanism to secure the water container; a lid seal between the base lid and the tub lid when the water container is received in the base; an outlet pipe for connection with an air delivery tube in use; a first gas flow port (676) aligned with and in a facing arrangement with the first air opening when the water container is received in the base; a second gas flow port (722) aligned with and in a facing arrangement with the second air opening when the water container is received in the base; and a peripheral seal (722) between the second gas flow port and the second air opening, the second air opening being surrounded by a substantially planar and substantially rectangular sealing surface of the water container that aligns with a substantially rectangular portion of the peripheral seal when the water container is received in the base to create a substantially sealed air path between the peripheral seal and the second air opening without the need to establish tubular interconnection between the base and the water container. The water container and the base include complementary configurations that facilitate alignment of the water container with respect to the base to ensure alignment between the first air opening and the first gas flow port. The water container is removable from the base and then refillable with water without requiring disengagement of the air delivery tube from the outlet pipe. The first air opening, t