A respiratory humidification system for providing humidification to gases that pass through a gas passage way before being provided to an airway of a patient is disclosed. The respiratory humidification system may include a liquid flow controller providing a controlled flow of liquid, a heating system including a heating surface configured to be located in a gases passage way and provide humidification to gases passing through the passage way, wherein the heating system receives the controlled flow of liquid, and one or more hardware processors providing deterministic control of a humidity level of gases passing through the gas passage way by instructing the liquid flow controller to adjust the controlled flow of liquid received at the heating system.揭露了一種用於在提供至病人氣道之前將增濕提供給通過氣體通路的氣體的呼吸增濕系統。呼吸增濕系統可包括提供經控制液體流的液體流控制器、加熱系統以及一或更多個硬體處理器，加熱系統包括配置用以位在氣體通路中並提供增濕給通過通路的氣體的加熱表面，其中加熱系統接收經控制液體流，且一或更多個硬體處理器藉由指示液體流控制器以調整加熱系統接收的經控制液體流，來提供通過氣體通路的氣體的濕度位準確定性控制。
