What is a hot surface ignitor?

A hot surface ignitor (HSI) is an electronic device used to ignite gas in heating systems, such as furnaces and boilers. It operates by becoming extremely hot when an electric current passes through it, reaching temperatures high enough to ignite the gas. Here’s a detailed explanation of how it works and its applications:

How It Works:

Material: HSIs are typically made from silicon carbide or silicon nitride, materials known for their ability to withstand high temperatures.

Electrical Current: When the furnace or boiler receives a signal to start heating, an electrical current flows through the ignitor.

Heating: The current heats the ignitor to a very high temperature, usually between 1200 to 1800 degrees Fahrenheit (650 to 980 degrees Celsius), causing it to glow red hot.

Ignition: Once the ignitor reaches the necessary temperature, it is placed near the gas flow. The heat from the ignitor ignites the gas, starting the combustion process.

Safety: Modern systems use sensors to ensure that the ignitor is functioning correctly and that the gas has been ignited, preventing gas buildup and potential explosions.

A hot surface ignitor is a crucial component in modern gas-fired heating appliances, providing efficient and reliable ignition of gas through the application of high temperatures generated by an electric current.