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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.