OHIO HYDRONICS CONTRACTOR
EXAMINATION STUDY SHEET 2026 VERIFIED
QUESTION–ANSWER COLLECTION
◉ Low temperature heating
Answer: Which type of hydronic system would use gravity?
◉ Heating and cooling system that uses water or HTF as a heat
transfer medium
Answer: Describe a hydronic system:
◉ HTF (Heat Transfer Fluid)
Answer: Brine or glycol mixture is commonly referred to
as___________?
◉ 1907
Answer: In which year did Willis Carrier patent the dew point
control system?
◉ 180 BTU
,Answer: How many BTUs are required to heat one pound of water
from 32°F to 212°F?
◉ Heat loss of the building
Answer: In order to provide accurate indoor temperatures, the heat
supply to the building must be equal to ____________?
◉ Conduction, convection, radiation, evaporation
Answer: What are the four types of heat transfer?
◉ 8 GPM
Answer: Calculate the GPM for an 80 MBH heat load using water as
the HTF with a change in temp of 20°F
◉ Measure longest circuit and add 50% for fittings and terminal
units
Answer: How is TEL (total equivalent length) measured and
calculated?
◉ Latent heat
Answer: Which type of heat, when added or removed from a
substance, creates a change of state?
, ◉ The amount of moisture in the air
Answer: Define humidity:
◉ Temperature of air taken with a standard thermometer
Answer: What is the dry bulb temperature?
◉ Sling Psychrometer
Answer: Which tool is used to determine relative humidity?
◉ Gallons per minute
Answer: How is rate of flow measured?
◉ Radiation, convection, conduction
Answer: Three types of heat transfer
◉ Radiation
Answer: Which heat transfer describes the condition when a body
loses heat to cooler surfaces?
◉ 0.433 psig/ft
Answer: What is the pressure of 1ft of water (vertical)?
EXAMINATION STUDY SHEET 2026 VERIFIED
QUESTION–ANSWER COLLECTION
◉ Low temperature heating
Answer: Which type of hydronic system would use gravity?
◉ Heating and cooling system that uses water or HTF as a heat
transfer medium
Answer: Describe a hydronic system:
◉ HTF (Heat Transfer Fluid)
Answer: Brine or glycol mixture is commonly referred to
as___________?
◉ 1907
Answer: In which year did Willis Carrier patent the dew point
control system?
◉ 180 BTU
,Answer: How many BTUs are required to heat one pound of water
from 32°F to 212°F?
◉ Heat loss of the building
Answer: In order to provide accurate indoor temperatures, the heat
supply to the building must be equal to ____________?
◉ Conduction, convection, radiation, evaporation
Answer: What are the four types of heat transfer?
◉ 8 GPM
Answer: Calculate the GPM for an 80 MBH heat load using water as
the HTF with a change in temp of 20°F
◉ Measure longest circuit and add 50% for fittings and terminal
units
Answer: How is TEL (total equivalent length) measured and
calculated?
◉ Latent heat
Answer: Which type of heat, when added or removed from a
substance, creates a change of state?
, ◉ The amount of moisture in the air
Answer: Define humidity:
◉ Temperature of air taken with a standard thermometer
Answer: What is the dry bulb temperature?
◉ Sling Psychrometer
Answer: Which tool is used to determine relative humidity?
◉ Gallons per minute
Answer: How is rate of flow measured?
◉ Radiation, convection, conduction
Answer: Three types of heat transfer
◉ Radiation
Answer: Which heat transfer describes the condition when a body
loses heat to cooler surfaces?
◉ 0.433 psig/ft
Answer: What is the pressure of 1ft of water (vertical)?
