NIECO, 10291, Hot Surface Ignitor, 24 Volt
A hot surface ignitor is an electrical device used in gas furnaces to ignite the gas that powers the system. It typically consists of a silicon carbide element that heats up when electricity is applied, reaching temperatures high enough to ignite the gas. This process ensures that no additional flame sources are required for ignition, reducing wear and tear on mechanical parts and improving safety and efficiency compared to older systems like pilot lights.
The hot surface ignitor works by converting electrical energy into heat energy. Once it reaches the appropriate temperature, it opens the gas valve and allows gas to flow into the combustion chamber, where it is ignited by the hot surface.
Hot surface ignitors are preferred over pilot lights because they are safer, easier to maintain, and do not require relighting.
They are also less expensive and more reliable in many cases.
However, they can be prone to failure due to factors such as contamination, overfiring, and exposure to higher voltages than they are designed to handle.
These ignitors are commonly used in modern gas furnaces and can last about five to ten years, though some newer models made with silicon nitride are more durable and can last longer.