Hot Water Recirculation Water Savings

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 re-circulation 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 re-circulation 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.

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 re-circulation 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.

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 re-circulation 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 re-circulation 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.

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 re-circulation 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 re-circulation 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.

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 re-circulation 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 re-circulation 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.

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 re-circulation 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 re-circulation 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.

* 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.