Michigan Hydronic and Process Piping Test / Boiler Code /
boiler installer & repairer licensing rules
Comprehensive Resource To Help You Ace 2026-2027
Exams Includes Frequently Tested Questions With
ELABORATED 100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. MAWP refers to:
a) minimum allowable working pressure, the lowest gage pressure
permissible for a boiler to operate
b) maximum allowable working pressure, the maximum gage pressure
permissible for a boiler to operate
c) mean average working pressure over a boiler's operational lifetime
d) maximum ambient working pressure at sea level - Correct Answer: b
2. Hot Water Heating and Hot Water Supply Boilers are classified as:
a) a boiler that operates at pressures not over 160 psi or temperatures not
over 250°F
b) a boiler that operates at pressures not over 300 psi or temperatures not
over 210°F
c) a boiler that operates at pressures over 160 psi only
d) a boiler used exclusively for steam generation - Correct Answer: a
3. A Miniature Boiler is defined as:
a) a power boiler not over 24" inside shell diameter with no pressure limit
b) a power boiler that is not over 16" inside shell diameter, has a working
pressure of no more than 100 psig, has a gross volume of no more than 5
cu. ft, and has no more than 20 sq. ft of heating surface
c) any boiler with a gross volume under 10 cu. ft regardless of diameter
d) a hobby locomotive boiler only - Correct Answer: b
,4. A "New Boiler" is defined as a boiler constructed, installed, placed in
operation, or contracted after what date?
a) January 1st, 1960
b) July 1st, 1966
c) July 1st, 1976
d) January 1st, 1966 - Correct Answer: b
5. A Water Heater is defined as what?
a) a heater supplying potable hot water at pressures not exceeding 160 psi
or temperatures not exceeding 210°F, not exceeding 200,000 BTU/hr or a
capacity of more than 120 gallons
b) a heater supplying potable hot water at any pressure with no BTU limit
c) a heater supplying non-potable water only, used for industrial processes
d) a boiler exceeding 250°F used for supply purposes - Correct Answer:
a
6. May a single manually-operated remote shutdown switch be used in a
multiple boiler installation that shares a common boiler room?
a) No, each boiler requires its own dedicated switch
b) Yes
c) Only if the boilers are under 100 psig
d) Only for hot water heaters, not steam boilers - Correct Answer: b
7. True or False: if multiple contractors are performing separate work on the
same boiler, only one contractor is required to be licensed and obtain a
permit.
a) True
b) False, all contractors must be licensed and obtain a permit for the work
to be performed - Correct Answer: b
,8. Boiler installer license class 1B allows for:
a) installation of a low-pressure boiler or group of modular boilers not to
exceed 1,000,000 BTU/hr
b) installation of a low-pressure boiler of any capacity
c) installation of a power boiler up to 5,000 pounds of steam/hr
d) installation of a nuclear heat source boiler - Correct Answer: a
9. Boiler installer license class 2B allows for:
a) installation of only modular boilers under 1,000,000 BTU/hr
b) installation of a low-pressure boiler of any capacity or firing rate and any
class 1B work
c) installation of high-pressure boilers exclusively
d) installation of nuclear heat source boilers - Correct Answer: b
10.Boiler installer license class 3B allows for:
a) installation of a power boiler with a capacity of no more than 5,000
pounds of steam/hr and installation of non-boiler external piping as defined
by ASME B31.1
b) installation of a low-pressure boiler only
c) installation of a boiler of any capacity excluding nuclear
d) installation of nuclear heat source boiler components - Correct
Answer: a
11.Boiler installer license class 4B allows for:
a) installation of a boiler with a capacity of no more than 300,000 pounds of
steam/hr and installation of non-boiler external piping as defined by ASME
B31.1
b) installation of a boiler with a capacity of no more than 5,000 pounds of
steam/hr
c) installation of a low-pressure boiler or modular group only
d) installation of nuclear heat source boilers - Correct Answer: a
, 12.Boiler installer license class 5B allows for:
a) installation of a boiler of any capacity or firing rate excluding nuclear heat
source boilers
b) installation of a boiler of any capacity, including nuclear heat source
boilers
c) installation of low-pressure boilers only
d) installation limited to non-boiler external piping - Correct Answer: a
13.Boiler installer license class 6B allows for:
a) installation of low-pressure boilers up to 1,000,000 BTU/hr
b) installation of a boiler that utilizes a nuclear heat source or its parts,
appurtenances, or system components
c) installation of non-boiler external piping only
d) installation of power boilers up to 5,000 pounds of steam/hr -
Correct Answer: b
14.Boiler installer license class P allows for:
a) installation or replacement of non-boiler external piping as defined by
ASME B31.1
b) installation of nuclear heat source boilers
c) installation of low-pressure boilers of any capacity
d) installation of power boilers up to 300,000 pounds of steam/hr -
Correct Answer: a
15.A Boiler repairer license class I allows for:
a) repair of high-pressure boilers by welding
b) repair of a boiler by means other than welding, riveting, or other
fabrication process
c) repair of nuclear heat source boilers
d) repair and replacement of non-boiler external piping - Correct
Answer: b
boiler installer & repairer licensing rules
Comprehensive Resource To Help You Ace 2026-2027
Exams Includes Frequently Tested Questions With
ELABORATED 100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. MAWP refers to:
a) minimum allowable working pressure, the lowest gage pressure
permissible for a boiler to operate
b) maximum allowable working pressure, the maximum gage pressure
permissible for a boiler to operate
c) mean average working pressure over a boiler's operational lifetime
d) maximum ambient working pressure at sea level - Correct Answer: b
2. Hot Water Heating and Hot Water Supply Boilers are classified as:
a) a boiler that operates at pressures not over 160 psi or temperatures not
over 250°F
b) a boiler that operates at pressures not over 300 psi or temperatures not
over 210°F
c) a boiler that operates at pressures over 160 psi only
d) a boiler used exclusively for steam generation - Correct Answer: a
3. A Miniature Boiler is defined as:
a) a power boiler not over 24" inside shell diameter with no pressure limit
b) a power boiler that is not over 16" inside shell diameter, has a working
pressure of no more than 100 psig, has a gross volume of no more than 5
cu. ft, and has no more than 20 sq. ft of heating surface
c) any boiler with a gross volume under 10 cu. ft regardless of diameter
d) a hobby locomotive boiler only - Correct Answer: b
,4. A "New Boiler" is defined as a boiler constructed, installed, placed in
operation, or contracted after what date?
a) January 1st, 1960
b) July 1st, 1966
c) July 1st, 1976
d) January 1st, 1966 - Correct Answer: b
5. A Water Heater is defined as what?
a) a heater supplying potable hot water at pressures not exceeding 160 psi
or temperatures not exceeding 210°F, not exceeding 200,000 BTU/hr or a
capacity of more than 120 gallons
b) a heater supplying potable hot water at any pressure with no BTU limit
c) a heater supplying non-potable water only, used for industrial processes
d) a boiler exceeding 250°F used for supply purposes - Correct Answer:
a
6. May a single manually-operated remote shutdown switch be used in a
multiple boiler installation that shares a common boiler room?
a) No, each boiler requires its own dedicated switch
b) Yes
c) Only if the boilers are under 100 psig
d) Only for hot water heaters, not steam boilers - Correct Answer: b
7. True or False: if multiple contractors are performing separate work on the
same boiler, only one contractor is required to be licensed and obtain a
permit.
a) True
b) False, all contractors must be licensed and obtain a permit for the work
to be performed - Correct Answer: b
,8. Boiler installer license class 1B allows for:
a) installation of a low-pressure boiler or group of modular boilers not to
exceed 1,000,000 BTU/hr
b) installation of a low-pressure boiler of any capacity
c) installation of a power boiler up to 5,000 pounds of steam/hr
d) installation of a nuclear heat source boiler - Correct Answer: a
9. Boiler installer license class 2B allows for:
a) installation of only modular boilers under 1,000,000 BTU/hr
b) installation of a low-pressure boiler of any capacity or firing rate and any
class 1B work
c) installation of high-pressure boilers exclusively
d) installation of nuclear heat source boilers - Correct Answer: b
10.Boiler installer license class 3B allows for:
a) installation of a power boiler with a capacity of no more than 5,000
pounds of steam/hr and installation of non-boiler external piping as defined
by ASME B31.1
b) installation of a low-pressure boiler only
c) installation of a boiler of any capacity excluding nuclear
d) installation of nuclear heat source boiler components - Correct
Answer: a
11.Boiler installer license class 4B allows for:
a) installation of a boiler with a capacity of no more than 300,000 pounds of
steam/hr and installation of non-boiler external piping as defined by ASME
B31.1
b) installation of a boiler with a capacity of no more than 5,000 pounds of
steam/hr
c) installation of a low-pressure boiler or modular group only
d) installation of nuclear heat source boilers - Correct Answer: a
, 12.Boiler installer license class 5B allows for:
a) installation of a boiler of any capacity or firing rate excluding nuclear heat
source boilers
b) installation of a boiler of any capacity, including nuclear heat source
boilers
c) installation of low-pressure boilers only
d) installation limited to non-boiler external piping - Correct Answer: a
13.Boiler installer license class 6B allows for:
a) installation of low-pressure boilers up to 1,000,000 BTU/hr
b) installation of a boiler that utilizes a nuclear heat source or its parts,
appurtenances, or system components
c) installation of non-boiler external piping only
d) installation of power boilers up to 5,000 pounds of steam/hr -
Correct Answer: b
14.Boiler installer license class P allows for:
a) installation or replacement of non-boiler external piping as defined by
ASME B31.1
b) installation of nuclear heat source boilers
c) installation of low-pressure boilers of any capacity
d) installation of power boilers up to 300,000 pounds of steam/hr -
Correct Answer: a
15.A Boiler repairer license class I allows for:
a) repair of high-pressure boilers by welding
b) repair of a boiler by means other than welding, riveting, or other
fabrication process
c) repair of nuclear heat source boilers
d) repair and replacement of non-boiler external piping - Correct
Answer: b
