Master Plumber Exam Water Heaters and Hot Water Systems 2

Question 1

What type of anode rod is recommended for a water heater connected to a water softener system?

Accepted Answer

Aluminum-zinc combination anode rod

Answer

Aluminum-zinc anode rods are preferred for softened water because magnesium rods corrode too rapidly in the elevated-conductivity environment created by salt-based softeners.

Question 2

Per the International Plumbing Code, what is the maximum hot water temperature permitted at bathing fixtures in healthcare facilities?

Accepted Answer

110°F

Answer

The IPC limits hot water at healthcare bathing fixtures to 110°F to protect patients who may have reduced sensation, mobility, or reaction time from scalding injuries.

Question 3

A tankless water heater must deliver 2.5 GPM with a 70°F temperature rise. Approximately how many BTU/hr must it produce?

Accepted Answer

87,500 BTU/hr

Answer

BTU/hr = GPM × 60 min × 8.33 lb/gal × ΔT = 2.5 × 60 × 8.33 × 70 ≈ 87,465 BTU/hr.

Question 4

According to the Uniform Plumbing Code, what is the maximum height above the floor or flood-level rim of a floor drain at which a T&P relief valve discharge pipe may terminate?

Accepted Answer

6 inches

Answer

The UPC requires the T&P discharge pipe to terminate no more than 6 inches above the floor or drain flood-level rim so hot water discharges safely without risk of scalding nearby occupants.

Question 5

What does the Energy Factor (EF) rating measure for a water heater?

Accepted Answer

The overall energy efficiency based on a simulated 24-hour use cycle

Answer

The EF rating compares the energy content of hot water delivered to total energy consumed over a standardized 24-hour test cycle, representing overall efficiency.

Master Plumber Exam Practice Test

Master Plumber Exam Practice Test

Master Plumber Exam Water Heaters and Hot Water Systems 2