Modulating gas orifice

A gas delivery system for controlling a target gas input rate of a fluid heating device comprising:

• a sensor in communication with a gas flowing in a gas flow path, the sensor configured to measure a temperature of the gas;
• an electronic valve is fluid communication with the gas flow path;
• and
• a controller in communication with the sensor and the electronic valve, the controller configured to:
• receive, from the sensor, temperature data indicative of the temperature of the gas;
• determine a target cross-sectional area of an orifice of the electronic valve based at least in part on the target gas input rate and the temperature data;
• and
• output a signal to the electronic valve to transition the orifice from a first position having a first cross-sectional area to a second position having the target cross-sectional area.

A non-transitory, computer-readable medium storing instructions, that when executed by one or more processors, cause a controller of a gas delivery system to:

• receive, from a sensor, temperature data indicative of a temperature of a gas;
• determine a target cross-sectional area of a modulating orifice based at least in part on a target gas input rate and the temperature data;
• and
• output a signal to a motor to transition the modulating orifice from a first position having a first cross-sectional area to a second position having the target cross-sectional area.