FREE Journeyman Plumbers Water Heaters and Boilers Questions and Answers

Question 1

A homeowner reports that their gas-fired storage water heater is producing lukewarm water and the pilot light frequently goes out.
The thermocouple has been replaced, but the issue persists.
What is the MOST likely cause of this problem?

Accepted Answer

A clogged flue vent leading to improper combustion.

Answer

A faulty pressure relief valve causing water to escape.

Answer

Insufficient gas pressure at the appliance regulator.

Answer

Sediment buildup at the bottom of the tank.

Question 2

Which of the following is a primary safety device designed to prevent excessive temperature and pressure in a storage-type water heater?

Accepted Answer

Temperature and Pressure Relief (T&P) valve

Answer

Vacuum breaker

Answer

Expansion tank

Answer

Backflow preventer

Question 3

A plumber is inspecting a residential hydronic heating system with a cast iron boiler. The homeowner complains of frequent boiler short-cycling and inconsistent heating. The pressure gauge reads 10 PSI when cold and 25 PSI when hot. What is the MOST probable cause of these symptoms?

Accepted Answer

An undersized expansion tank or one that has lost its air charge.

Answer

A faulty circulator pump causing poor water circulation.

Answer

Excessive sediment buildup within the boiler heat exchanger.

Answer

A clogged condensate drain line.

Question 4

When installing an electric storage water heater, what is the purpose of the sacrificial anode rod?

Accepted Answer

To protect the tank lining from corrosion.

Answer

To regulate the water temperature within the tank.

Answer

To prevent mineral buildup on the heating elements.

Answer

To increase the efficiency of the heating process.

Question 5

A commercial building requires a continuous supply of hot water for multiple fixtures. Which type of water heater would generally be most suitable for this application, offering high recovery rates and consistent temperature?

Accepted Answer

Tankless (on-demand) water heater

Answer

Point-of-use electric water heater

Answer

Small capacity storage water heater

Answer

Solar thermal water heater (passive system)

Question 6

During routine maintenance, a plumber notices a significant amount of white, chalky residue on the heating elements of an electric water heater. This indicates a problem related to:

Accepted Answer

Hard water conditions.

Answer

Excessive water pressure.

Answer

High levels of sediment in the municipal water supply.

Answer

A malfunctioning anode rod.

A homeowner reports that their gas-fired storage water heater is producing lukewarm water and the pilot light frequently goes out.The thermocouple has been replaced, but the issue persists.What is the MOST likely cause of this problem?

A homeowner reports that their gas-fired storage water heater is producing lukewarm water and the pilot light frequently goes out.
The thermocouple has been replaced, but the issue persists.
What is the MOST likely cause of this problem?