If your gas fireplace, stove, or heater isn't working properly, chances are you need a new thermopile! This Freecat 36-inch replacement is exactly what you're looking for. It puts out 750mv and works with natural gas or propane systems. The compatibility list is huge - it replaces part numbers 60125501, h5882, 60J79, 60J7901, R942, 2103-512 and many more. The construction is solid with aluminum, brass, and glass components that can handle working temperatures up to 700-750°C. It generates 4000 British Thermal Units, which is exactly what most gas appliances need to operate properly. The 36-inch length gives you plenty of wire to work with during installation. Here's an important note - it needs to heat up gradually to reach that 750mv output, so don't expect instant results. The inner resistance is around 3500-4000mΩ, which is completely normal for these types of thermopiles. The aluminum glass fiber cover ensures long-term reliability and performance. Whether you're fixing a Heat & Glo fireplace, Heatilator stove, gas oven, water heater, or even a gas fryer, this thermopile has you covered. Installation is pretty straightforward if you're comfortable working with gas appliances - just make sure to turn off the gas first! Much cheaper than calling a repair technician, and you'll have your fireplace or heater working again in no time. Keep your family warm and cozy with this reliable replacement part!