Red Seal Plumbing Practice Exam

A, B, and C are all too low as these temperatures range from 1600 to 2400 degrees Fahrenheit. Hot surface igniters are designed to be able to reach high temperatures in order to ignite the gas or fuel in appliances such as furnace and ovens. A temperature of 2600 degrees Fahrenheit is needed in order to provide a spark and light the gas, making option D the most accurate answer.