Everythin You Could Possibly Want to Know About High-Efficiency Toilets and Other
Water Saving Devices.

High-Efficiency Toilet

What is a high-efficiency toilet, or HET?

Under federal law, no toilets may be sold that use more than 1.6 gallons of water per flush (gpf). These are called low-flow toilets. High-efficiency toilets are designed to use even less. Most use about 1.28 gallons per flush, but a few impressive models are as stingy as 1.1 or even 0.8 gallons.

Can I receive a rebate on a high-efficiency dual flush toilet?

Yes, but there are restrictions. WaterSense® dual flush toilets must also use 1.28 gallons per flush or less for both flush options. In other words, the flush rate for both liquids and solids must not exceed 1.28 gallons of water. Be sure that you verify that neither flush option uses more than 1.28 gallons per flush on the toilet that you purchase.

How do I calculate how much water my toilet uses?

To get a good idea of just how much water an older toilet can use, take a look at our Water Use Calculator or use the information below.

How to Determine Your Toilet’s Flush Volume
The flush volume of a toilet simply means how much water is released when it is flushed. To qualify for this rebate program you must be replacing a toilet currently using more than 1.6 gallons per flush. So, that means you need to know your toilet’s flush volume.

If you see a year stamped on the inside of the tank, that information may help us determine the tank’s flush volume, as well.

A marking or label may is typically located near the toilet seat hinge on the bowl that can provide you with that information. Please note that the markings and labels are often in liters as opposed to gallons. Here’s a quick reference to help determine your toilet’s flush volume if it is listed in liters.

Gallons Per Flush Equals This Many Liters Per Flush
5 to 7                               18.92 to 26.49
3.5                                      13.24
1.6 to 3.5                          6.05 to 13.24
1.6                                    6.0 to 6.05
1.28                                       4.84

(Note: If your toilet has a large black cylinder inside of it instead of the standard flushing mechanism, your toilet is using 1.6 gallons per flush and does not qualify for this program.)
If you cannot locate any markings or labels near the seat hinge, check the underside of the tank lid or the tank’s back inside wall for a date stamped in the porcelain.

Still can’t find any markings or labels? Then you can perform an easy test to determine how much water your toilet uses by following these simple steps.
1. Turn the water supply to your toilet off. (Note: if you cannot turn the valve or do not have access to the valve simply prevent the toilet from refilling by holding up the float device in your tank.
2. Measure the length of the tank in inches.
3. Measure the width of the tank in inches.
4. Measure the full water level in the toilet tank in inches (depth 1).
5. Flush the toilet and measure the drop at the lowest level (depth 2).
6. Subtract depth 2 from depth 1. This will give you the “drop” measurement.
7. Multiply the length times the width times the “drop” measurement number you noted for Step No. 6 to determine the volume of cubic inches of water used per flush.
8. Divide the volume by 231 to get the number of gallons per flush.

Here’s an example to use to help you calculate your gallons per flush.
Step 2 – Length: 17.5
Step 3 – Width: 7
Step 4 – Full level: 6
Step 5 – Low level: 3.5
Step 6 – 6 minus 3.5 = 2.5
Step 7 – 17.5 x 7 x 2.5 = 306.25
Step 8 – 306.25 divided by 231 = 1.32

How do HETs compare to older toilets?

Some toilets made before 1980 used as much as 5 to 7 gallons of water per flush (gpf). If you swap one of those antiques for a high-efficiency toilet (HET), you could save as much as 5.7 gallons per flush. One person using one HET five times a day would save almost 30 gallons of water. A family of four, 120 gallons a day. In a year, that family could save almost 44,000 gallons of water by switching from a 7 gpf toilet to a 1.28 gpf high-efficiency model.

Not all older toilets use 5 to 7 gallons per flush. What are some of the others?

That’s right. Toilets sold between 1980 and1994 used 3.5 gallons per flush (gpf). By swapping one of these for a high-efficiency toilet, you would save 2.2 gpf. Five flushes a day equal a savings of 11 gallons per person. For a family of four, that’s 44 gallons saved every single day.

And that saves money too, right?

You bet! As much as $2,000 on your utility bills over the life of the toilet, depending on your local rates. That’s a great deal more than the cost of the toilet, so they more than pay for themselves. And, the cost of water isn’t expected to decrease.

But do high-efficiency toilets work well enough to clear the bowl and leave it clean on just one flush? How likely are they to clog up?

HETs are designed by computers to combine high efficiency and high performance and actually work better than standard toilets. That’s also why we require WaterSense®-approved toilets only for our rebate program. If you are concerned about the strength of the flush, we recommend a MaP rating of 800 grams per flush.

When you see the WaterSense® label on toilets it means that they are certified by independent laboratory testing to meet rigorous criteria for both performance and efficiency. Click here to learn more about WaterSense® toilets.

You may also read about some HET Myths here

Are HETs noisy like those older power-flush toilets?

No. They are designed to flush quietly without loss of flushing efficiency.

How much are the rebates?

Up to $100, or the cost of the toilet, whichever is less. Please remember that sales tax may not be included as part of the rebate.

How many rebates may I receive?

Single-family, townhouse and condo owners who reside in the home at which they are replacing the toilet(s) may receive up to two rebates per qualifying accountholder.

Property owners and managers authorized by the property owner of multi-family housing units, not-for-profit agencies, commercial buildings and institutional facilities may receive up to five rebates or can submit a request to receive more.

How do I get a rebate application?

You may apply online or download an application from the website; pick up an application at your participating local water utility’s customer service office, or request that one be mailed to you by calling 1-800-270-9794.

How does the rebate program work?

The simply answer is this: Determine if your community is offering rebates. If you qualify under the Program’s Terms and Conditions and funding is still available, complete and submit an application. After your application is approved you will receive an email or a letter with all the instructions on how to receive your rebate. Read that, then buy and install your toilet. After installation, you submit the required documentation and your rebate will be mailed to you.

Please remember that you must be pre-approved before you purchase and install your toilet. Toilets purchased before your approval date will not qualify for a rebate.


Which communities are offering toilet rebates?

They include the utility service areas of the cities of Coconut Creek, Coral Springs, Dania Beach, Deerfield Beach, Fort Lauderdale, Hallandale Beach, Lauderhill, Margate, Pembroke Pines, Plantation and Sunrise/Weston, and the towns of Davie and Hillsboro Beach.

However, there may be rebates being offered by other entities that are not participating in this program. Contact your local water utility provider to determine what is available in your service area.

Check Eligibility

Who makes HETs?

Most major toilet manufacturers make HETs. However, only WaterSense®-approved HETs that use 1.28 gallons per flush or less are eligible for a rebate. That means that even WaterSense®-approved dual flush HETs must use 1.28 gallons per flush or less for each of the toilet’s flush options. Note: Many high-efficiency toilets are sold in two parts, with the tank and bowl sold separately. When components combine to make a WaterSense® labeled product, tanks should include the words “When used in combination with [bowl model number/name]” in close proximity to the label, and similarly with bowl labeling.

Only the combinations provided on the WaterSense Website (http://www.epa.gov/WaterSense/product_search.html) have been certified under the WaterSense® label.

How can I find out which of the HETs perform best?

Look for a green-and-white sticker that says WaterSense® on the toilets. These are certified to meet rigorous standards for performance and efficiency that are recognized by the U.S. Environmental Protection Agency. And note that toilet manufacturers offer ordinary toilets and HETs with similar names. The sticker is your best assurance you are buying an HET model. Although not required, it is recommended that the Maximum Performance rating of the toilet for solids removal is at least 800 grams – typically written as MaP 800g on the toilet specifications

Should I know anything else about the program?

Yes. Qualifying accountholders may also be able to get, absolutely free, new high-efficiency, low-flow faucet aerators and showerheads from their local water utilities. Click here to learn more about getting your free devices. Businesses may qualify for new pre-rinse spray valves to power rinse dishes before washing. Business owners may click here to learn more about getting your free pre-rinse spray valve.

Can I install an HET myself?

You sure can. Click here to watch a quick step-by-step video that explains how to remove and install a toilet yourself.

Water-Efficient Showerhead

What is a water-efficient showerhead?

Well, just like high-efficiency toilets save water, so do water-efficient showerheads. Standard showerheads use 2.5 gallons of water per minute (gpm). Water-efficient showerheads use no more than 2.0 gpm. Look for the WaterSense® certified label to ensure that your new showerhead is a water-efficient model.

How much water will I save with a water-efficient showerhead?

The average household could save more than 2,300 gallons per year by installing WaterSense® labeled showerheads. Since these water savings will reduce demands on water heaters, households will also save energy. In fact, a household could save 300-kilowatt hours of electricity annually, enough to power its television use for about a year. Save water, energy AND money? Now that’a a good deal.

Does my community offer free, water-efficient showerheads?

The following communities are offering their residents free, water-efficient showerheads. Click your city or town for more information.

If your community is not listed, click here to see if there are other water-conserving appliances available to you.

Pre-Rinse Spray Valve

How much water will I save my business by installing low-flow pre-rinse spray valves?

Restaurants that use the pre-rinse operation typically consume about 30 percent of all water used in the establishment. Low-flow models use 1.6 gallons of water per min (gpm) or less. The best models use around 0.64 gpm.

Depending on use, a low-flow pre-rinse spray valve can save up to $1,000 throughout the course of a year. On average, a restaurant that uses a low-flow pre-rinse spray valve for 3 hours saves 80 gallons of water, which is $975 annually.

Does my community offer free, low-flow pre-rinse spray valves for business owners?

The following communities are offering business owners free, low-flow pre-rinse spray valves. Click your city or town for more information.

If your community is not listed, click here to see if there are other water-conserving appliances available to you.

Can I install a low-flow pre-rinse spray valve myself?


What is a low-flow faucet aerator?

How do I install a low-flow faucet aerator?

Does my community offer free, low-flow faucet aerators?