ESCO GAS HEATING EXAM 2026 WITH
100 QUESTIONS AND WELL-VERIFIED
CORRECT ANSWERS | ALREADY
GRADED A+ GUARANTEED PASS | ESCO
GAS HEATING LATEST EXAM 2026
Flashback describes - ANSWER-The flames moving from the burner outlets,
upstream of the gas flow, to burn at the office.
Flashback is a symptom of - ANSWER-Gas velocity, which is slower than the rate
of the flame advancing
When a residential furnace experiences flashback, it is typically caused by -
ANSWER-Low gas pressure at the manifold
An ignition module is installed on a rooftop unit. Because it is exposed to weather,
the pilot on the unit sometimes blows out. The unit must be available to heat, as the
building has plumbing that could freeze if heating fails overnight while it's
unoccupied. What type of ignition module is to be installed here? - ANSWER-
None 100% shut off
If an ignition system is 100% shut off then when it senses flame failure, gas flow is
shut off to both the - ANSWER-Burner and pilot
, In the past, it was believed that if an LP furnace had a non-100% shut off control,
the propane would pull near the ignition source, creating an explosive hazard. Why
is it that LP furnaces are not necessarily required to use 100% shut off controls
anymore? - ANSWER-Newer, ignition modules, use soft, lockouts, or continuous
retry to repeatedly attempt to relight the pilot without creating a continuous
buildup of gas
Which which must operate before a furnace with a draft inducer will ignite -
ANSWER-Differential air pressure
Combustion of one cubic foot of liquefied fuel releases approximately how much
energy? - ANSWER-2500 BTU
The vent stack temperature for a natural draft furnace is typically - ANSWER-
350°F to 450°F
The vent stack temperature for a mid efficiency furnace is typically - ANSWER-
350°F to 450°F
The vent stack temperature for a high efficiency furnace is typically - ANSWER-
110°F to 120°F
That is a double wall flue pipe. What materials are used for the two layers? -
ANSWER-The inner wall is aluminum and the outer wall is steel
Which three things are required for combustion - ANSWER-Oxygen, fuel, heat
100 QUESTIONS AND WELL-VERIFIED
CORRECT ANSWERS | ALREADY
GRADED A+ GUARANTEED PASS | ESCO
GAS HEATING LATEST EXAM 2026
Flashback describes - ANSWER-The flames moving from the burner outlets,
upstream of the gas flow, to burn at the office.
Flashback is a symptom of - ANSWER-Gas velocity, which is slower than the rate
of the flame advancing
When a residential furnace experiences flashback, it is typically caused by -
ANSWER-Low gas pressure at the manifold
An ignition module is installed on a rooftop unit. Because it is exposed to weather,
the pilot on the unit sometimes blows out. The unit must be available to heat, as the
building has plumbing that could freeze if heating fails overnight while it's
unoccupied. What type of ignition module is to be installed here? - ANSWER-
None 100% shut off
If an ignition system is 100% shut off then when it senses flame failure, gas flow is
shut off to both the - ANSWER-Burner and pilot
, In the past, it was believed that if an LP furnace had a non-100% shut off control,
the propane would pull near the ignition source, creating an explosive hazard. Why
is it that LP furnaces are not necessarily required to use 100% shut off controls
anymore? - ANSWER-Newer, ignition modules, use soft, lockouts, or continuous
retry to repeatedly attempt to relight the pilot without creating a continuous
buildup of gas
Which which must operate before a furnace with a draft inducer will ignite -
ANSWER-Differential air pressure
Combustion of one cubic foot of liquefied fuel releases approximately how much
energy? - ANSWER-2500 BTU
The vent stack temperature for a natural draft furnace is typically - ANSWER-
350°F to 450°F
The vent stack temperature for a mid efficiency furnace is typically - ANSWER-
350°F to 450°F
The vent stack temperature for a high efficiency furnace is typically - ANSWER-
110°F to 120°F
That is a double wall flue pipe. What materials are used for the two layers? -
ANSWER-The inner wall is aluminum and the outer wall is steel
Which three things are required for combustion - ANSWER-Oxygen, fuel, heat
