Final answer:
The question pertains to minimum temperature requirements for hot water in shampoo bowls, which relate to health and safety standards in the hair industry. A 30,000 Btu/hr water heater is equivalent to 8,800 watts, and the heating time depends on the water volume and temperature rise needed.
Step-by-step explanation:
The student is asking about the minimum temperature requirements for hot water in shampoo bowls. In the hair industry, there are health and safety standards that dictate how hot water should be to ensure comfort and safety for clients. The conversion of energy from Btu/hr to Watts and the time it takes to heat water are relevant to understanding water heaters and their capacity to provide hot water.
A 30,000 Btu/hr water heater is equivalent to 8,800 W (watts). To determine how long it would take to heat a shower's worth of water, two calculations would be needed. One calculation would be based on the volume of water needed and the temperature increase required, while the other calculation would take into account the power of the water heater in watts.