BMC Water Chamber For Luna devices


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The Water Chamber is a replacement chamber for the BMC GII Luna Integrated Heated Humidifier

Please Note: The water chamber is not filled from the top. To refill the water, locate the small dial located on the front corner on the bottom of the chamber.

This water chamber is only compatible with the GII BMC Luna CPAP and Auto machines. It is not designed to fit any other BMC CPAP machines models.



Important Tips

How to fill the water chamber:

Lift the humidifier lid to withdraw the chamber from the device. 

Please Note: After turning the machine and humidifier OFF, please allow approximately 15 minutes for the heater plate & water to cool down before removing the chamber. Then, complete the following steps:
  • DO NOT fill the hole on the top of the chamber with water. Turn to the bottom of the water chamber to locate the small dial on the front left side of the chamber.
  • With the bottom facing upward, grip and turn the water inlet cap in a counterclockwise direction until the arrow on the cap is facing the triangular mark by the opening.
  • Release any residual water still sitting in the chamber to ensure all of the water is fresh.
  • Add approximately 350mL of water into the water inlet.
  • DO NOT exceed the maximum water level. (marked on the water chamber)
  • Place the water inlet cap over the opening and turn it in a clockwise direction to lock the cap in place. The arrow on the cap will be locked once it is directly across from the circular symbol.
  • Empty the water chamber when the humidifier is not in use. 


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  • 5
    Water Tank/ Humidifier

    Posted by Paul on 15th Aug 2019

    No problems, replaced old one, perfect fit.
    Location suited me, easy to pickup.