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Humidifier apparatus for a respiratory apparatus includes a housing providing a gas flow path, a heater apparatus, and a water supply distribution member configured and arranged to deliver water vapor to the gas flow path. The water distribution member is provided to the housing and in thermal commu

Humidifier apparatus for a respiratory apparatus includes a housing providing a gas flow path, a heater apparatus, and a water supply distribution member configured and arranged to deliver water vapor to the gas flow path. The water distribution member is provided to the housing and in thermal communication with the heater apparatus.

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1. Humidifier apparatus for a respiratory apparatus, comprising: a housing having a gas inlet and a gas outlet on either side of a substantially-flat center section;a base plate supported by an internal shoulder of said housing and forming a bottom wall of said housing, wherein a gas flow path is de

1. Humidifier apparatus for a respiratory apparatus, comprising: a housing having a gas inlet and a gas outlet on either side of a substantially-flat center section;a base plate supported by an internal shoulder of said housing and forming a bottom wall of said housing, wherein a gas flow path is defined in said housing between said gas inlet and said gas outlet;a heater apparatus; anda water supply distribution member configured and arranged to deliver water vapour to the gas flow path, said water distribution member comprising an envelope formed by a first compartment wall and a second compartment wall joined together, and a water inlet into the envelope; wherein the water distribution member is supported within said housing by said base plate and said internal shoulder, and in thermal communication with the heater apparatus which is supported on the base plate, in a space between the base plate and the water distribution member, and further wherein said gas flow path is substantially parallel to the base plate and the water supply distribution member. 2. Humidifier apparatus according to claim 1, where the water distribution member is adapted to be a removable and replaceable fitting to the housing. 3. Humidifier apparatus according to claim 1, wherein the envelope defines a thin water layer having a thickness of less than about 10 mm. 4. Humidifier apparatus according to claim 1, wherein the envelope defines a thin water layer having a thickness of less than about 5 mm. 5. Humidifier apparatus according to claim 1, wherein the envelope has a volume of less than about 150 ml. 6. Humidifier apparatus according to claim 1, wherein the envelope has a volume of less than about 100 ml. 7. Humidifier apparatus according to claim 1, wherein the water distribution member is adapted for production of water vapour within the envelope. 8. Humidifier apparatus according to claim 1, wherein the first compartment wall is at least in part a semi-permeable membrane structured to allow water vapour to pass therethrough into the gas flow path. 9. Humidifier apparatus according to claim 8, wherein the semipermeable membrane comprises a finely perforated material. 10. Humidifier apparatus according to claim 8, wherein the semipermeable membrane comprises a hydrophobic material. 11. Humidifier apparatus according to claim 1, wherein the water distribution member is a removable and replaceable fitting to the base plate of the housing. 12. Humidifier apparatus according to claim 1, wherein the heater apparatus comprises a heater element and the second compartment wall includes a thermally conductive wall in thermal contact with the heater element. 13. Humidifier apparatus according to claim 12, wherein the heater element comprises a heater plate. 14. Humidifier apparatus according to claim 1, wherein the heater apparatus comprises an induction heater and the second compartment wall includes a thermally conductive wall in thermal contact with an induction receiving element. 15. Humidifier apparatus according to claim 14, wherein the induction receiving element is incorporated in the second compartment wall. 16. Humidifier apparatus according to claim 1, wherein at least a portion of the heater apparatus is a removable and replaceable fitting to said base plate of the housing. 17. Humidifier apparatus according to claim 1, wherein said gas flow path has a thickness of less than about 5 mm in said center section. 18. Humidifier apparatus according to claim 1, further including a plate configured and arranged to divide the gas flow path into two gas streams such that only one gas stream receives water vapour from the water distribution member and one or more devices control the amount of gas flow into one or both gas streams. 19. Humidifier apparatus according to claim 1, further including one or more variable apertures placed between the water supply distribution member and the gas flow path. 20. Humidifier apparatus according to claim 19, wherein the one or more variable apertures are structured to regulate the amount of water vapour transferred to the gas flow path. 21. Humidifier apparatus according to claim 1, wherein the water distribution member water inlet communicates with a water inlet passage of the housing. 22. Humidifier apparatus according to claim 21, further comprising a water reservoir adapted for communication with the water inlet passage. 23. Humidifier apparatus according to claim 21, further including a water filter in communication with the water inlet or the water inlet passage. 24. A CPAP device, comprising: a positive airway pressure device; anda humidifier apparatus according to claim 1.