Product: Gas fireplace heater temperature sensor (thermopile) Why you need it Restores reliable flame sensing and pilot operation for gas appliances that use a thermopile to generate control voltage. Prevents intermittent shutdowns and poor pilot response by returning the thermopile to proper sensitivity and output. Durable construction reduces the need for frequent replacements under normal use. Key features and performance Broad compatibility: Designed for use with fireplaces, water heaters, and fryers that use a pilot assembly and thermopile-based flame sensing. Required operating conditions: Minimum output voltage 750 mV. The thermopile should be heated to at least 700 °C and then allowed to stabilize and increase to the desired operating voltage during normal operation. Functional replacement: May differ in external appearance from original parts but is functionally equivalent to previous components for seamless replacement and performance compatibility. Rugged construction: Built with a sturdy body to withstand routine thermal cycling and mechanical handling while maintaining sensitivity and accuracy over time. What it solves Restores proper control voltage to keep pilot-operated gas valves open and appliances running reliably. Eliminates false shutdowns caused by worn or underperforming thermopiles. Provides a drop-in functional replacement when the original sensor is no longer producing sufficient voltage. Practical applications and use scenarios Home gas fireplace: Replace a worn thermopile in a pilot assembly to restore steady pilot flame sensing and prevent unexpected shutoffs. Residential gas water heater: Install as a compatible replacement to ensure reliable pilot-operated ignition and continuous hot water supply. Commercial or kitchen fryer: Use in pilot-equipped fryers where consistent flame detection and stable control voltage are required for safe operation. Installation and operation notes Install with the appliance pilot as intended; ensure the sensor reaches the recommended temperature for proper voltage generation. Allow the sensor to heat to at least 700 °C and stabilize so output rises to and exceeds the 750 mV minimum. Appearance may vary from original parts, but functionality and electrical performance are matched to the prior component. Compatibility and reliability Suited for appliances employing thermopile flame sensing and pilot assemblies. Engineered for long service life under normal operating conditions while preserving sensitivity and measurement accuracy. If replacing a faulty thermopile, confirm your appliance uses a pilot-equipped thermopile sensor and follow manufacturer instructions for safe installation and testing.