NATE GAS HEATING EXAM QUESTIONS WITH CORRECT ANSWERS 2026

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NATE GAS HEATING EXAM QUESTIONS
WITH CORRECT ANSWERS 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%




Many pre-1992 furnaces have efficiencies around _______.


A: 10%


B: 40%


C: 60%

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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

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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

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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


B: 1,050


C: 12,000