1.28 VS 1.6 GPF Toilets Features Comparison 2022

1.28 VS 1.6 GPF

Should I buy a 1.28 GPF toilet or a 1.6 GPF toilet? This is one of the questions that linger on buyers’ minds when looking for an efficient and reliable best toilet for their bathroom. With water becoming scarce, toilet manufacturers have resorted to creating water-efficient toilets in a bid to reduce the rate of water used during flushing. Read this 1.28 VS 1.6 GPF toilets comparison article to know more about the difference between them.

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Among the various home fixtures, the toilet uses a whopping 30% of water. This is high when compared to other bathroom fixtures. As a result, the federal government came up with a law that requires all toilets to be installed to use 1.6 GPF or less. Today, toilets that are installed in the USA must consume 1.6 GPF or less. In some states like California and Colorado, the water usage rate is even lower at 1.28 GPF.

1.28 VS 1.6 GPF Toilets Comparison

Here is a full comparison of the 1.28 GPF and 1.6 GPF toilets:


1.6 GPF

1.28 GPF

Water Consumption: 1.6 Gallons Per Flush 1.28 Gallons Per Flush
Water-Saving: No Yes
Powerful Flush: Yes No
1 Flush Enough? 1 Flush is Enough Some time may need two flush
Sound Quiet Quieter
Eco-Friendly: No Yes
Bowl: Larger Smaller
Space Saving: No Yes
Laws: A few USA States Don’t Allow USA all States Allow
Popularity: Decreasing Increasing
Bowl After Flush: Marginally Cleaner Clean
Price: 1.28 VS 1.6 GPF ToiletsCheck Price 1.6 VS 1.28 GPF ToiletCheck Price

Details of the 1.28 and 1.6 GPF toilets

So, as you debate about which toilet to choose between the 1.28 GPF and 1.6 GPF, you should be aware of the country and state regulations on water usage.

1.28 GPF toilet

With the improvement in technology, you should no longer worry about your toilet failing to be effective when it comes to clear waste. Toilet manufacturers have come up with advanced technologies that allow toilets to use less water but clear waste very efficiently. That’s what you get with most 1.28 GPF. These toilets help you to save water, and you may even get rebates in some states.

Related: Best Low Flow Toilets Reviews [10 Water-Saving Toilet]

Additionally, 1.28 GPF toilets meet the EPA WaterSense guideline; thus, they can be installed anywhere in the country.
1.28 GPF toiletsCheck Today’s Price On Amazon

  • It is EPA WaterSense certified
  • It saves water as it uses less than 1.28 GPF
  • 1.28 gpf toilet is compact with a space-saving design
  • It can be installed anywhere in the country


  • Users may have to flush more than once
  • The flush is not very powerful

1.6 GPF toilet

Before 1.28 GPF toilets become popular, 1.6 GPF toilets were the real deal. But at the moment, 1.28 GPF are trending, and the sales for 1.6 GPF toilet is slowly coming down. However, some people still prefer them over 1.28 GPF toilets as they have a more powerful flush.
1.6 GPF toiletCheck Today’s Price On Amazon

  • It has a powerful flush
  • Normally flushes quietly
  • It conserves water as it uses 1.6 GPF
  • No need to flush twice as it is effective


  • It is not EPA WaterSense certified
  • The toilet cannot be installed in all states in the country
  • Similarities and differences between 1.28 GPF and 1.6 GPF toilets

Features Comparison: 1.28 VS 1.6 GPF Toilets

Flushing efficiency

Many people use the toilet even without thinking about the amount of water they push down the drain. Over the years, the amount of water used to flush the toilet has reduced. In the 1980s, toilets used more than 7 GPF; then, it came down to 3.5 GPF. In 1994, the Energy Policy Act was implemented, and it required toilets to use less than 1.6 GPF. Today, that amount has even become lower as they are pushing for 1.28 GPF.

However, there is a difference in flushing efficiency between the 1.28 GPF and 1.6 GPF toilets. Toilets that use 1.6 GPF are more powerful and typically don’t require the user to flush the toilet twice. On the other hand, most of the 1.28 GPF toilets don’t feature a very powerful flush, but they are efficient in water usage.

Size of the toilet

Most 1.28 GPF toilets are usually compact with a smaller bowl when compared to 1.6 GPF toilets. So, if the size is of importance to you, then you should consider selecting a 1.6 GPF unit.

Ease of maintenance

Maintaining 1.28 GPF toilets might be challenging as most of them tend to clog. This is not the case with most 1.6 GPF toilets. So, find out if the toilet you’re buying has an efficient flushing system or not. Also, such toilets will tend to leave behind marks that can force you to clean the toilet after every use.

EPA WaterSense certified

When it comes to saving water, the 1.28 gallons per flush toilet is the best option hands down. That’s why it is referred to as a high-water-efficiency toilet. In some states like Georgia, you will get rebates for installing this type of toilet.

However, states like California, Texas, and Colorado require all toilets to be installed to be high-efficiency. This is because water is scarce in these states.


Even though 1.6 GPF toilets feature a more powerful flushing system, the 1.28 GPF toilet is more expensive. When you look at it from a different perspective, it is worth the price. After all, you will save water and receive a lower water bill. Also, you may get rebates in some states for installing it.

Which is better? 1.6 or 1.28 GPF?

If you want to conserve water and get rebates, then you’re better off with the 1.28 GPF toilet. But if you want an efficient flushing system, then you should consider picking the 1.6 GPF toilet. Both of these toilets will help you to save water and be efficient in performance.

For those who live in the states of California, Colorado, and Texas, you have no option but to choose the 1.28 GPF toilets. All the best as you try to save water and install a comfortable and reliable toilet in your bathroom. Still, have questions after reading this 1.28 VS 1.6 GPF toilets article? Comment below.


Hi, I am Jose S. Franz. Currently, I am working as a professional plumber, and our team offers various plumbing services at an affordable price. After my college education, I completed a vocational certification course in plumbing systems and worked with several construction companies. Since then, I have fixed lots of different toilet models, from older to the latest versions. So I have more than 22 years of experience installing plumbing systems and toilets in both residential and commercial buildings.


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