NATE Gas Heating Exam Questions and Answers 2026/2027 – Verified Edition, A+ Grade|NATE Gas Heating Exam Prep – Verified Edition

NATE Gas Heating Exam questions and answers
2026\2027 A+ Grade

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%



Many pre-1992 furnaces have efficiencies around _______.



A: 10%



B: 40%



C: 60%



D: 80%
- correct answer C: 60%



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

,A: 85%



B: 90%



C: 100%



D: 110%
- correct answer B: 90%



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



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

, D: Allow the gas valve to operate smoothly and accurately
- correct answer C: Maintain a constant gas pressure at the burner



The instrument used to measure outlet gas pressure is the:



A: Velometer



B: Anemometer



C: Monometer



D: Draft gauge
- correct answer C: Monometer



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"



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



A: 800