Concept explainers
The amount of oil and money, a family of four will save per year by replacing the standard shower heads by the low-flow ones.

Explanation of Solution
Given:
The initial volume of the low-flow shower head
The final volume of the low-flow shower head
The time
The number person in family
The density of water
The specific heat of water
The initial temperature of the low-flow shower head
The final temperature of the low-flow shower head
The efficiency of the fuel in the low-flow shower head
The heating value of fuel
The unit cost of fuel is
Calculation:
Calculate the rate of water saved volume of the low-flow shower head a family of four will save per year.
Calculate the mass flow rate of water of the low-flow shower head.
Calculate the amount of energy saved in the low-flow shower head.
Calculate the amount fuel saved in the low-flow shower head.
Thus, the amount of oil, a family of four will save per year by replacing the standard shower heads by the low-flow ones is
Calculate the amount of money saved in the low-flow shower head.
Thus, the amount of money, a family of four will save per year by replacing the standard shower heads by the low-flow ones is
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