SAVE MONEY

pumpSave Money With Hot Water Recirculation

The Wait is Over – Hot Water in an Instant

The Basic Concept: Every homeowner gets frustrated waiting for hot water — but how many stop to think what happens to the 2-3 gallons of water that runs down the drain during the wait?

Those gallons of water are wasted, and in an average household that takes four showers per day, that can add up to thousands of gallons per year. Multiplied over a subdivision of 300 homes, a community can have millions of gallons of water go down the drain and into the wastewater system every single year (see state-by-state water consumption and costs).

In a region where water conservation issues are rising in importance with a rapidly expanding population, and a record economic expansion that has consumers looking for comfort, Hot Water Recirculation (HWR) pumps — such as those manufactured by Grundfos Pumps Corporation — are a good solution to this problem.

In typical plumbing, water is pumped from the water heater through the pipes to the tap. Once the tap is shut off, the water remaining in the pipes cools — hence the familiar wait for hot water the next time the tap is opened.

Grundfos HWR pumps offer a solution to the problem by attaching to the water heater through the hot water pipe. By constantly circulating hot water through the pipes from the heater to the furthest fixture, the water in the pipes is always hot, and no water is wasted during the wait. In an average new home, HWR systems typically cost less than $1,000, including parts and installation.

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

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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*
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.