NATE Gas & Heat Exam 2025 – HVAC Gas Heating
Professional Certification Guide|| GRADED A+||
LATEST UPDATE 2025/26
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% -CORRECTANSWER C: 78%
Many pre-1992 furnaces have efficiencies around .
A: 10%
B: 40%
C: 60%
D: 80% -CORRECTANSWER C: 60%
,Today, furnaces with AFUE ratings greater than are available.
A: 85%
B: 90%
C: 100%
D: 110% -CORRECTANSWER 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 -CORRECTANSWER 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 -CORRECTANSWER 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 -CORRECTANSWER C: Monometer
The regulator on a natural gas furnace should be adjusted to supply inches of
pressure at the burners.
Professional Certification Guide|| GRADED A+||
LATEST UPDATE 2025/26
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% -CORRECTANSWER C: 78%
Many pre-1992 furnaces have efficiencies around .
A: 10%
B: 40%
C: 60%
D: 80% -CORRECTANSWER C: 60%
,Today, furnaces with AFUE ratings greater than are available.
A: 85%
B: 90%
C: 100%
D: 110% -CORRECTANSWER 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 -CORRECTANSWER 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 -CORRECTANSWER 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 -CORRECTANSWER C: Monometer
The regulator on a natural gas furnace should be adjusted to supply inches of
pressure at the burners.
