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A humidifier heater base assembly has a heater plate with a thermally conductive portion and a perimeter portion around a perimeter of the heater plate. A resilient member has an inner part attached to the perimeter portion and an outer part adapted to provide a resilient perimeter flange around at

A humidifier heater base assembly has a heater plate with a thermally conductive portion and a perimeter portion around a perimeter of the heater plate. A resilient member has an inner part attached to the perimeter portion and an outer part adapted to provide a resilient perimeter flange around at least part and preferably the whole of the perimeter portion. The resilient member fixes the heater base to the humidifier by the resilient perimeter flange such that the heater plate and the inner part can move relative to the humidifier in a direction substantially transverse to the general plane of the heater plate. At least a portion of the resilient perimeter flange remains stationary relative to the humidifier.

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1. A respiratory humidification system which humidifies a flow of respiratory gases supplied to a user, the respiratory humidification system configured to heat the contents of a removably attachable humidifier chamber, the respiratory humidification system comprising: a base unit configured to rece

1. A respiratory humidification system which humidifies a flow of respiratory gases supplied to a user, the respiratory humidification system configured to heat the contents of a removably attachable humidifier chamber, the respiratory humidification system comprising: a base unit configured to receive the humidifier chamber;a heater plate mounted to the base unit and positioned to contact the humidifier chamber and transfer heat to the humidifier chamber; anda resilient support member with an outer portion extending outward from a periphery of the heater plate, the outer portion defining a resilient perimeter flange,wherein the resilient support member and the heater plate are mounted to the base unit such that the heater plate is movable relative to the base unit, the base unit supporting the resilient perimeter flange. 2. The respiratory humidification system of claim 1, further comprising a heating element configured to provide heat to the heater plate. 3. The respiratory humidification system of claim 2, wherein the resilient support member provides a fluid barrier between the heater plate and the base unit. 4. The respiratory humidification system of claim 1, wherein the resilient support member comprises a narrow section between the heater plate and the base unit, the narrow section providing an area in which the resilient support member elastically deflects when the heater plate is displaced relative to the base unit in a direction substantially transverse to a general plane of the heater plate in use. 5. The respiratory humidification system of claim 1, wherein the resilient support member comprises a skirt section formed in the resilient support member between the heater plate and the base unit, the skirt section configured to elastically deflect when the heater plate is displaced relative to the base unit in a direction substantially transverse to a general plane of the heater plate. 6. The respiratory humidification system of claim 1, wherein a gap is included between the base unit and a bottom surface of the resilient support member or heater plate or both, the gap being sized to allow the humidifier chamber to displace the heater plate downwardly from a neutral position. 7. The respiratory humidification system of claim 1, wherein the resilient support member comprises an inner portion coupled to the heater plate, the heater plate fixed to the base unit by the outer portion in such a manner that the heater plate and the inner portion can move relative to the base unit. 8. The respiratory humidification system of claim 7, wherein the heater plate and the inner portion can move relative to the base unit in a direction substantially transverse to a general plane of the heater plate. 9. The respiratory humidification system of claim 1, wherein the resilient support member comprises a flexible gasket or diaphragm that is adapted to resiliently fix the heater plate to the base unit of the humidifier. 10. The respiratory humidification system of claim 1, wherein the resilient support member is attached to a perimeter portion of the heater plate. 11. The respiratory humidification system of claim 1, wherein the base unit further comprises two humidifier components and the resilient support member is clamped between the two humidifier components to secure the heater plate to the base unit with at least a portion of the resilient support member being at least slightly compressed between the two humidifier components. 12. The respiratory humidification system of claim 1, wherein the outer portion mounts on the base unit. 13. The respiratory humidification system of claim 1, comprising electrical wires associated with the heating element, wherein the electrical wires are routed away from the heater plate via at least one channel formed in the resilient support member. 14. The respiratory humidification system of claim 13, wherein the electrical wires extend from an inner part of the resilient member to an outer part of the resilient member. 15. The respiratory humidification system of claim 1, wherein the heater plate comprises a thermally conductive portion and a perimeter portion, the thermally conductive portion being configured to contact the humidifier chamber to heat the contents of the humidifier chamber. 16. The respiratory humidification system of claim 15, wherein at least part of the perimeter portion is formed out of plane with the thermally conductive portion. 17. The respiratory humidification system of claim 15, wherein in use, the perimeter portion is below the thermally conductive portion. 18. The respiratory humidification system of claim 15, wherein the heater plate is formed to the desired size and shape at least partially by stamping and/or pressing from a sheet material. 19. The respiratory humidification system of claim 15, wherein the thermally conductive portion is planar and wherein the perimeter portion defines an out-of-plane portion, the out of plane portion being below the thermally conductive portion in use. 20. The respiratory humidification system of claim 1, wherein the resilient support member is formed from a resilient material. 21. The respiratory humidification system of claim 20, wherein the resilient material is silicone. 22. The respiratory humidification system of claim 1, wherein the base unit further comprises a first humidifier component and a second humidifier component, and the resilient support member is clamped between the first humidifier component and the second humidifier component. 23. The respiratory humidification system of claim 22, wherein the first humidifier component defines an opening, and at least a portion of the heater plate is disposed within the opening. 24. The respiratory humidification system of claim 22, wherein the second humidifier component is connected to the first humidifier component by screw fasteners, and wherein the first humidifier component and the second humidifier component are assembled so that there is a fixed vertical distance between a horizontal portion of the first humidifier component and the second humidifier component. 25. The respiratory humidification system of claim 22, wherein compression of the resilient perimeter flange between the first humidifier component and the second humidifier component provides a fluid barrier between the resilient perimeter flange and the second humidifier component. 26. The respiratory humidification system of claim 25, wherein the fluid barrier comprises a water tight barrier. 27. The respiratory humidification system of claim 22, wherein the first humidifier component comprises a downwardly extending projection configured to contact the resilient support member, and the second humidifier component comprises an upwardly extending projection configured to contact the resilient support member, wherein the resilient perimeter flange is sandwiched between the downwardly extending projection and the upwardly extending projection, a sandwiched portion of the resilient perimeter flange being compressed, and the portion of the resilient support member between the heater plate and the sandwiched portion being un-compressed in the assembled respiratory humidification system. 28. The respiratory humidification system of claim 27, wherein the upwardly extending projection extends continuously around a perimeter of the second humidifier component. 29. The respiratory humidification system of claim 1, further comprising a humidifier compartment configured to receive the humidifier chamber, wherein the heater plate forms at least part of a base of the humidifier compartment, and wherein the humidifier compartment is configured to partially enclose the humidifier chamber when the humidifier chamber is received therein. 30. The respiratory humidification system of claim 1, wherein the resilient perimeter flange comprises a flange upper surface, an inner part of the resilient support member comprising an inner part upper surface, wherein the flange upper surface is vertically offset from the inner part upper surface. 31. The respiratory humidification system of claim 1, further comprising the humidifier chamber. 32. The respiratory humidification system of claim 31, wherein the humidifier chamber comprises a conductive chamber base and a base perimeter portion, the conductive chamber base extending proud of the base perimeter portion. 33. The respiratory humidification system of claim 1, wherein the resilient support member comprises a first groove in an upper surface of the resilient support member, the first groove extending continuously around the resilient support member. 34. The respiratory humidification system of claim 33, wherein the first groove is located at a position intermediate of the outer perimeter of the resilient support member and an outer perimeter of the heater plate. 35. The respiratory humidification system of claim 33, wherein the resilient support member comprises a second groove formed in the lower surface of the resilient support member. 36. The respiratory humidification system of claim 33, wherein the second groove is located at a position intermediate of the outer perimeter portion of the resilient support member and an outer perimeter of the heater plate. 37. The respiratory humidification system of claim 33, wherein the first groove and the second groove are aligned in a vertical direction. 38. The respiratory humidification system of claim 1, wherein a gap is provided between a bottom surface of the resilient support member and an upper surface of the base unit, the gap being present when the resilient member is un-deflected. 39. The respiratory humidification system of claim 38, wherein the resilient member is un-deflected when the humidifier chamber is not installed within the humidifier compartment, and the resilient support member is deflectable from an un-deflected state to a deflected state when the humidifier chamber is received in the humidifier compartment, the resilient support member providing an upwards bias on the heater plate in the deflected state. 40. The respiratory humidification system of claim 38, wherein the deflection of the resilient support member results in downward displacement of the heater plate when the humidifier chamber is inserted into the humidifier compartment. 41. A method of suspending a heater plate in a respiratory humidification system, the method comprising: providing a base unit configured to receive a humidifier chamber, a heater plate positioned to contact a bottom of the humidifier chamber and transfer heat to the humidifier chamber; and a resilient support member with an outer portion extending outward from a periphery of the heater plate, the outer portion defining a resilient perimeter flange, wherein the resilient support member and the heater plate are mounted to the base unit such that the heater plate is movable relative to the base unit, the base unit supporting the resilient perimeter flange;inserting the humidifier chamber into the base unit by displacing the heater plate and resilient support member;locking the humidifier chamber in place such that the heater plate and resilient support member are displaced relative to a neutral position. 42. The method of claim 41, wherein the resilient support member provides a force configured to push the heater plate against the bottom of the humidifier chamber when the humidifier chamber is installed.