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Hot Water Recirculation Water Savings

Scroll to Detailed Water Savings by State
Estimate the Amount of Water Wasted in Your Home Each Year
Pipe Type
Hot Water Supply Length, ft
Pipe Volume, gallons
# of Times Water is Used Daily
Daily Water Volume Wasted, gallons
Annual Water Volume Wasted
1/2″ Copper, Type “L”
100
2.7
10
27.0
9855.0
1/2″ Copper, Type “L”
150
3.4
10
34.0
12410.0
1/2″ Copper, Type “L”
200
4.5
10
45.3
16534.5
1/2″ Copper, Type “L”
250
5.7
10
56.6
20659.0
1/2″ Copper, Type “L”
300
6.8
10
67.9
24783.5
3/4″ Copper, Type “L”
100
5.0
10
50.3
18359.5
3/4″ Copper, Type “L”
150
7.5
10
75.4
27521.0
3/4″ Copper, Type “L”
200
10.5
10
105.0
38325.0
3/4″ Copper, Type “L”
250
12.6
10
126.0
45990.0
3/4″ Copper, Type “L”
300
15.1
10
151.0
55115.0
Detailed Water Savings by State

Arizona
In Arizona, the average household consumes 126,632 gallons of water per year at an annual cost of $236.49*. With new housing starts estimated to reach 54,903 per year by 2000, annual water consumption by new houses alone will total nearly 7 billion gallons at a cost of approximately $13 million per year. Were all new houses built in Arizona to include a Grundfos hot water recirculation system (with an average 200 foot supply line), water saved would total 16,534** gallons per year per household. The corresponding annual water bill would be reduced by approximately $32 and the energy bill by approximately $44. In total, hot water recirculation could save the state of Arizona nearly 950 million gallons of water per year and save new home owners nearly $1.8 million in annual water charges.
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California
In California, the average household consumes 174,701 gallons of water per year at an annual cost of $314.90*. With new housing starts estimated to reach 171,800 per year by 2000, annual water consumption by new houses alone will total more than 30 billion gallons at a cost of nearly $54 million per year. Were all new houses built in California to include a Grundfos hot water recirculation system (with an average 200 foot supply line), water saved would total 16,534** gallons per year per household. The corresponding annual water bill would be reduced by approximately $31 and the energy bill approximately $44. In total, hot water recirculation could save the state of California nearly 3 billion gallons of water per year and save homeowners more than $5 million in annual water charges.
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Florida
In Florida, the average household consumes 85,822 gallons of water per year at an annual cost of $214.14*. With new housing starts estimated to reach 130,774 per year by 2000, annual water consumption by new houses alone will total more than 11 billion gallons at a cost of nearly $28 million per year. Were all new houses built in Florida to include a Grundfos hot water recirculation system (with an average 200 foot supply line), water saved would total 16,534** gallons per year per household. The corresponding annual water bill would be reduced by more than $40 and the energy bill by approximately $83. In total, hot water recirculation could save the state of Florida more than 2 billion gallons of water per year and save new homeowners more than $5 million in annual water charges.
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Nevada
In Nevada, the average household consumes 262,645 gallons of water per year at an annual cost of $369.82*. With new housing starts estimated to reach 21,000 per year by 2000, annual water consumption by new houses alone will total more than 5.5 billion gallons at a cost of nearly $8 million per year. Were all new houses built in Nevada to include a Grundfos hot water recirculation system (with an average 200 foot supply line), water saved would total 16,534** gallons per year per household. The corresponding annual water bill would be reduced by approximately $23 and the energy bill by approximately $45 ***. In total, hot water recirculation could save the state of Nevada more than 350 million gallons of water per year and save new homeowners nearly $500,000 in annual water charges.
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North Carolina
In North Carolina, the average household consumes 70,743 gallons of water per year at an annual cost of $176.81*. With new housing starts estimated to reach 14,500 per year by 2000, annual water consumption by new houses alone will total more than one billion gallons at a cost of nearly $2.5 million per year. Were all new houses built in North Carolina to include a Grundfos hot water recirculation system (with an average 200 foot supply line), water saved would total 16,534** gallons per year per household. The corresponding annual water bill would be reduced by approximately $42 and the energy bill by approximately $47. In total, hot water recirculation could save the state of North Carolina more than 200 million gallons of water per year and save new homeowners more than $600,000 in annual water charges.
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South Carolina
In South Carolina, the average household consumes 80,812 gallons of water per year at an annual cost of $193.82*. With new housing starts estimated to reach 27,475 per year by 2000, annual water consumption by new houses alone will total more than two billion gallons at a cost of nearly $5 million per year. Were all new houses built in South Carolina to include a Grundfos hot water recirculation system (with an average 200 foot supply line), water saved would total 16,534** gallons per year per household. The corresponding annual water bill would be reduced by approximately $41 and the energy bill by approximately $55. In total, hot water recirculation could save the state of South Carolina more than 450 million gallons of water per year and save new homeowners more than $1.1 million in annual water charges.
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*
Based on 1996 AWWA survey, the most recent data available.
**
Based on calculations for a ½’ Copper Type L Pipe with a pipe volume from hot water heater of 4.5 gallons.
***
Including water use and energy cost savings calculated based on the cost/Therm for the largest city in the state.