2025 NATE Gas Heating Exam Prep: Study Guide & Practice Questions for Success

1|Page


NATE Gas Heating Exam (NEW UPDATED VERSION) LATEST ACTUAL EXAM
QUESTIONS AND CORRECT ANSWERS (VERIFIED QUESTIONS AND ANSWERS)-
GUARANTEED PASS A+ UPDATED 2026




Since 1992, the United States Department of Energy has required that all furnaces sold and
installed from that date on must have an AFUE of no less than:


A: 70%


B: 75%


C: 78%



D: 80% - CORRECT ANSWER C: 78%



QUESTION : Many pre-1992 furnaces have efficiencies around _______.


A: 10%


B: 40%


C: 60%



D: 80% - CORRECT ANSWER C: 60%



QUESTION : Today, furnaces with AFUE ratings greater than _____ are available.



2026 2027 GRADED A+

,2|Page




A: 85%


B: 90%


C: 100%



D: 110% - CORRECT ANSWER B: 90%



QUESTION : A thermocouple is used with:


A: Intermittent pilot systems


B: Direct spark ignition systems


C: Glow coil ignition systems



D: Standing pilot ignition systems - CORRECT ANSWER D: Standing pilot ignition
systems


QUESTION : The purpose of the gas pressure regulator is to:


A: Keep the color of the flame constant


B: Keep the high limit switch from tripping


C: Maintain a constant gas pressure at the burner



2026 2027 GRADED A+

, 3|Page




D: Allow the gas valve to operate smoothly and accurately - CORRECT ANSWER C:
Maintain a constant gas pressure at the burner


QUESTION : The instrument used to measure outlet gas pressure is the:


A: Velometer


B: Anemometer


C: Monometer



D: Draft gauge - CORRECT ANSWER C: Monometer



QUESTION : The regulator on a natural gas furnace should be adjusted to supply _____ inches
of pressure at the burners.


A: 11"


B: 10"


C: 3.5"



D: 2" - CORRECT ANSWER C: 3.5"



QUESTION : Burning one cubic foot of natural gas releases approximately _____ btu.




2026 2027 GRADED A+