What's the difference between silicon carbide and silicon nitride?
Silicon carbide is a glass like material which composes the element of the hot surface igniter. Silicon nitride is a very rigid material which in may cases can be substituted for silicon carbide. There are two main differences between nitride and carbide: Silicon carbide igniters are very fragile, whereas silicon nitride igniters are virtually unbreakable. And, silicon carbide igniters can be used in direct sense applications, whereas silicon nitride igniters cannot.

What's the difference between round and flat igniters?
Round and flat igniters do essentially the same job. They are both 120 volts and function the same way. It is mainly a matter of preference.

Many of your hot surface igniters seem to overlap in applications - is there more than one part that can do the job?
Yes! - this is why we have the universal kits, such as the ANP1090, ANPSN5090 and ANPFC-055.

Calculate Square Footage
Measure how many square feet of space you need to heat in your home by measuring the dimensions of each room and hallway. Multiply the length and width of each room to find its square footage, and add them all together for your house's total square footage.

Calculate Furnace Size
Multiply the square footage of your home by a number between 30 and 60 to find the required number of BTUs to heat your home. The exact number you use depends on your climate. Multiply by 30 if you live in an area that rarely gets frost during the winter, multiply by 60 if winter temperatures rarely rise above freezing during the day and choose a number in between for moderate climates