Final answer:
All FVIR water heaters include a Thermocouple, Gas Control Valve, and Thermal Switch, which are critical safety components designed to detect pilot light status and regulate gas flow or shut down the heater in case of high temperatures or flammable vapors.
Step-by-step explanation:
All FVIR (Flammable Vapor Ignition Resistant) water heaters have components in common, including the Thermocouple, Gas Control Valve, and Thermal Switch.
These components work together to prevent the ignition of flammable vapors outside the water heater.
The Thermocouple is a safety device that detects if the pilot light is lit and will shut off the gas if the pilot flame goes out.
The Gas Control Valve regulates the flow of gas to the burner and pilot light. Meanwhile, the Thermal Switch is a safety device that will shut down the heater in the event that it detects excessively high temperatures or flammable vapor incidents.