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

Magnesium anode rod

Answer

Copper anode rod

Answer

Titanium anode rod

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

100°F

Answer

120°F

Answer

130°F

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

52,500 BTU/hr

Answer

105,000 BTU/hr

Answer

140,000 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

2 inches

Answer

4 inches

Answer

12 inches

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 maximum water temperature the heater can reach

Answer

The recovery rate in gallons per hour at a 100°F rise

Answer

The standby heat loss in BTU per hour

Question 6

Which venting material is NOT approved for use as a connector on a Category I atmospheric gas water heater?

Accepted Answer

Flexible aluminum dryer duct

Answer

Type B double-wall vent pipe

Answer

Single-wall galvanized steel connector

Answer

Listed stainless steel flue liner

Question 7

What is the minimum required slope for a T&P relief valve discharge pipe to ensure complete self-drainage?

Accepted Answer

1/4 inch per foot

Answer

1/8 inch per foot

Answer

1/2 inch per foot

Answer

1 inch per foot