CSLB Class B General Contractor's License Practice Exam

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Prepare for the CSLB Class B General Contractor's License Test with interactive flashcards and multiple choice questions. Each question offers hints and explanations to enhance your understanding and readiness for the exam.

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In order to protect a water heater from damage, what is the minimum height it should be from the floor of a garage?

24 inches
18 inches
12 inches
36 inches

The correct answer is: 18 inches

The minimum height a water heater should be installed above the floor in a garage is 18 inches to comply with safety regulations. This requirement is primarily designed to prevent the ignition of flammable vapors that may accumulate on the ground, especially in enclosed spaces such as garages. Many garages are places where fuel-powered vehicles are parked or where fuel-based equipment is stored, which can lead to the presence of gasoline vapors. By positioning the water heater at least 18 inches above the floor, you significantly reduce the risk of these vapors igniting if there is a spark or flame present, as the heat source (the burner) will be high enough to avoid direct exposure to these potentially dangerous fumes. This height requirement is part of various local building codes and safety standards to ensure the safe operation of gas appliances in environments where flammable liquids are commonly found.