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NATE Gas Heating Exam Questions With Complete Solution | Verified | Latest Version (2025/2026) Graded A+
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NATE Gas Heating Exam Questions With Complete Solution | Verified | Latest Version (2025/2026) Graded A+ 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% - answer-C: 78% Many pre-1992 furnaces have efficiencies around _______. A: 10% B: 40% C: 60% D: 80% - answer-C: 60%Today, furnaces with AFUE ratings greater than _____ are available. A: 85% B: 90% C: 100% D: 110% - 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 - answer-D: Standing pilot ignition systems
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