Monitors heater startup sequence for reliable ignition
Continuously tracks heat exchanger temperature to prevent damage
Functions as both a flame sensor and overheat protection device
Direct OEM replacement with no modifications required
Compatible with Espar Airtronic D2, D4, and B4 models
Summarized by Shop
Flame/Overheat Sensor (Combi-Sensor) for Espar D2, D4 & B4 Heaters
Keep your Espar heater running safely and efficiently with this OEM-quality Flame/Overheat Sensor — also known as the combi-sensor. Designed specifically for Espar Airtronic D2, D4, and B4 heaters, this sensor plays a critical role in monitoring startup and regulating