Gas Fitter 2 Practice Test – 2025/2026
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A room heater installed in either a sleeping area or public area shall be:
A. direct vent only
B. equipped with a regulator
C. equipped with a fan
D. equipped with an on / off switch on the wall - correct answerB
What type of vent must be used when the vent of a wall furnace will be concealed in a
partition wall?
A. B vent
B. L vent
C. BH vent
D. BW vent - correct answerD
Single wall vent connectors:
A. may pass through floors, ceilings or roofs provided a metal thimble is used
B. may pass through floors, ceilings or roofs provided the required minimum distance
from combustible material is maintained
C. may pass through floors, ceilings or roofs provided they are insulated
D. shall not pass through floors, ceilings or roofs - correct answerD
BW vent shall be used only with an approved:
A. decorative appliance
B. down flow furnace
C. revertible flue boiler
D. recessed wall furnace - correct answerD
What must be done during the installation of a gas log fireplace?
A. Make sure there is a metal mesh screen in front of the fireplace
B. Secure the chimney damper in the open position
C. Install a pressure regulator
D. Install a metal chimney liner - correct answerB
When can a certified hose be used to connect a construction heater to temporary
piping?
A. Only if a lever handle shut off valve is installed upstream of the hose
B. Only if the hose is 15 feet long
,C. Never - correct answerA
Which of the following is acceptable when a fireplace insert is installed?
A. A metal chimney linear
B. The existing fireplace flue
C. BW vent
D. A tile lined fireplace flue? - correct answerA
An unvented infra-red heater can be installed in ________ application
A. A warehouse
B. A commercial building
C. An industrial building
D. All of the above - correct answerD
Dirt pockets are required on:
A. Decorative appliances
B. Gas logs
C. Room heaters
D. None of the available choices - correct answerD
What diameter and length of a dirt pocket is required when a drop line is 3-inch
diameter?
A. 3 inch diameter by 3 inches long
B. 1 inch diameter by 3 inches long
C. 3/4 inch diameter by 3 inches long
D. 2 inch diameter by 3 inches long - correct answerD
What type of room heater maybe installed in a bathroom?
A. Natural draft
B. Direct fired
C. Forced draft
D. Direct vent - correct answerD
What safety control protects a steam boiler if the condensate pump fails to return water
to the boiler?
A. High pressure limit control
B. Low pressure limit control
C. Flame safeguard control
D. Low water cut off - correct answerD
The relief valve for a residential low-pressure hot water boiler system should be?
A. 14.7 psia
B. 15 psia
C. 30 psig
D. 30 psia - correct answerC
,A backflow prevent used in a boiler system should be located in the:
A. Over flow line connected to the drain
B. Return line close to the boiler
C. 1/4" line connecting the boiler and cushion tank
D. Make up water line to the system - correct answerB
Automatic chlorinators must be installed:
A. upstream of the heater
B. downstream of the heater
C. upstream of the filter
D. downstream of the filter - correct answerB
On seasonal start up, a pool heater should run:
A. intermittently
B. continuously for 24 hours
C. continuously until the thermostat is satisfied
D. one hour on and one hour off until the thermostat is satisfied - correct answerC
Before lighting a burner in a steam boiler, ensure that:
A. there is water in the boiler
B. the temperature controller is set properly
C. the main burner test firing valve is turned on
D. the safety valves are open - correct answerA
The recommended water temperature setting from a mixing valve to the domestic water
system in combination heating systems that employ oil-fired water heaters for heating
potable water and for space heating is:
A. 43°C (110°F)
B. 49°C to 54°C (120°F to 130°F)
C. 60°C to 66°C (140°F to 150°F)
D. 83°C (180°F) - correct answerB
An inverted sensor (measures water level) can be found operating what type of
appliance?
A. Hot water boiler
B. Steam water boiler
C. Domestic hot water storage tank
D. Domestic potable hot water tank - correct answerD
A backflow prevent used in a hydronic heating system is used to:
A. Keep hot water from entering the cold water system
B. Hold the pressure on the system during a temporary shutdown to prevent the entry of
air
C. Prevent the heating water from circulating the wrong way in the system
D. Keep non-combustible water from entering the drinking water system - correct
answerD
, A low water cut off device on an automatically fired hot water heating boiler rated at
350,000 Btuh (102 kW) is:
A. Not required if a limit control is installed
B. Not required if it is installed in the industrial application
C. Required when any portion of the circulating system is located below the boiler
D. Required only in commercial applications - correct answerC
A pressure reducing valve
A. Relieves system pressure in excess of the set pressure
B. Reduces the city main pressure to a safe working pressure
C. Reduces the working pressure to the city main pressure
D. Prevents hot water gravity circulation - correct answerB
The maximum operating pressure of a low pressure steam boiler is
A. 5 psig (35kPa)
B. 15 psig (100 kPa)
C. 100 psig (690 kPa)
D. 150 psig (1035 kPa) - correct answerB
A scotch marine boiler is what type of boiler?
A. Two pass boiler
B. Copper tube boiler
C. Fire tube boiler
D. Four pass water tube boiler - correct answerC
A fire tube boiler has:
A. Water outside the tube and flue gases outside
B. Water inside the tubes and flue gasses outside
C. Water inside the tubes and water outside
D. Water outside the tubes and flue gases inside - correct answerD
Why is a pressure relief valve installed on a pool heater system?
A. To maintain the pool water level
B. To prevent over pressurizing the filter
C. To prevent damage to the system
D. To relieve excess water pressure caused by solar gun - correct answerC
When does an electrically operated automatic vent damper on a mid-efficiency furnace
open?
A. Before the ignition cycle
B. When the furnace is hot
C. At the same time as the gas comes on
D. When the main switch is turned on - correct answerA
Updated Study Guide & Exam Prep | 100%
Pass Guarantee
A room heater installed in either a sleeping area or public area shall be:
A. direct vent only
B. equipped with a regulator
C. equipped with a fan
D. equipped with an on / off switch on the wall - correct answerB
What type of vent must be used when the vent of a wall furnace will be concealed in a
partition wall?
A. B vent
B. L vent
C. BH vent
D. BW vent - correct answerD
Single wall vent connectors:
A. may pass through floors, ceilings or roofs provided a metal thimble is used
B. may pass through floors, ceilings or roofs provided the required minimum distance
from combustible material is maintained
C. may pass through floors, ceilings or roofs provided they are insulated
D. shall not pass through floors, ceilings or roofs - correct answerD
BW vent shall be used only with an approved:
A. decorative appliance
B. down flow furnace
C. revertible flue boiler
D. recessed wall furnace - correct answerD
What must be done during the installation of a gas log fireplace?
A. Make sure there is a metal mesh screen in front of the fireplace
B. Secure the chimney damper in the open position
C. Install a pressure regulator
D. Install a metal chimney liner - correct answerB
When can a certified hose be used to connect a construction heater to temporary
piping?
A. Only if a lever handle shut off valve is installed upstream of the hose
B. Only if the hose is 15 feet long
,C. Never - correct answerA
Which of the following is acceptable when a fireplace insert is installed?
A. A metal chimney linear
B. The existing fireplace flue
C. BW vent
D. A tile lined fireplace flue? - correct answerA
An unvented infra-red heater can be installed in ________ application
A. A warehouse
B. A commercial building
C. An industrial building
D. All of the above - correct answerD
Dirt pockets are required on:
A. Decorative appliances
B. Gas logs
C. Room heaters
D. None of the available choices - correct answerD
What diameter and length of a dirt pocket is required when a drop line is 3-inch
diameter?
A. 3 inch diameter by 3 inches long
B. 1 inch diameter by 3 inches long
C. 3/4 inch diameter by 3 inches long
D. 2 inch diameter by 3 inches long - correct answerD
What type of room heater maybe installed in a bathroom?
A. Natural draft
B. Direct fired
C. Forced draft
D. Direct vent - correct answerD
What safety control protects a steam boiler if the condensate pump fails to return water
to the boiler?
A. High pressure limit control
B. Low pressure limit control
C. Flame safeguard control
D. Low water cut off - correct answerD
The relief valve for a residential low-pressure hot water boiler system should be?
A. 14.7 psia
B. 15 psia
C. 30 psig
D. 30 psia - correct answerC
,A backflow prevent used in a boiler system should be located in the:
A. Over flow line connected to the drain
B. Return line close to the boiler
C. 1/4" line connecting the boiler and cushion tank
D. Make up water line to the system - correct answerB
Automatic chlorinators must be installed:
A. upstream of the heater
B. downstream of the heater
C. upstream of the filter
D. downstream of the filter - correct answerB
On seasonal start up, a pool heater should run:
A. intermittently
B. continuously for 24 hours
C. continuously until the thermostat is satisfied
D. one hour on and one hour off until the thermostat is satisfied - correct answerC
Before lighting a burner in a steam boiler, ensure that:
A. there is water in the boiler
B. the temperature controller is set properly
C. the main burner test firing valve is turned on
D. the safety valves are open - correct answerA
The recommended water temperature setting from a mixing valve to the domestic water
system in combination heating systems that employ oil-fired water heaters for heating
potable water and for space heating is:
A. 43°C (110°F)
B. 49°C to 54°C (120°F to 130°F)
C. 60°C to 66°C (140°F to 150°F)
D. 83°C (180°F) - correct answerB
An inverted sensor (measures water level) can be found operating what type of
appliance?
A. Hot water boiler
B. Steam water boiler
C. Domestic hot water storage tank
D. Domestic potable hot water tank - correct answerD
A backflow prevent used in a hydronic heating system is used to:
A. Keep hot water from entering the cold water system
B. Hold the pressure on the system during a temporary shutdown to prevent the entry of
air
C. Prevent the heating water from circulating the wrong way in the system
D. Keep non-combustible water from entering the drinking water system - correct
answerD
, A low water cut off device on an automatically fired hot water heating boiler rated at
350,000 Btuh (102 kW) is:
A. Not required if a limit control is installed
B. Not required if it is installed in the industrial application
C. Required when any portion of the circulating system is located below the boiler
D. Required only in commercial applications - correct answerC
A pressure reducing valve
A. Relieves system pressure in excess of the set pressure
B. Reduces the city main pressure to a safe working pressure
C. Reduces the working pressure to the city main pressure
D. Prevents hot water gravity circulation - correct answerB
The maximum operating pressure of a low pressure steam boiler is
A. 5 psig (35kPa)
B. 15 psig (100 kPa)
C. 100 psig (690 kPa)
D. 150 psig (1035 kPa) - correct answerB
A scotch marine boiler is what type of boiler?
A. Two pass boiler
B. Copper tube boiler
C. Fire tube boiler
D. Four pass water tube boiler - correct answerC
A fire tube boiler has:
A. Water outside the tube and flue gases outside
B. Water inside the tubes and flue gasses outside
C. Water inside the tubes and water outside
D. Water outside the tubes and flue gases inside - correct answerD
Why is a pressure relief valve installed on a pool heater system?
A. To maintain the pool water level
B. To prevent over pressurizing the filter
C. To prevent damage to the system
D. To relieve excess water pressure caused by solar gun - correct answerC
When does an electrically operated automatic vent damper on a mid-efficiency furnace
open?
A. Before the ignition cycle
B. When the furnace is hot
C. At the same time as the gas comes on
D. When the main switch is turned on - correct answerA
