What is a GPF Toilet?

Gallons Per Flush (GPF) simply refers to how much water is needed for a toilet to flush and dispose of the water and waste left in the toilet bowl.

GPF toilet

So, what is a GPF toilet? A GPF toilet is generally a new toilet made with efficiency in mind and will let you know the GPF number when it is sold. If you lift the toilet tank’s lid and look inside, it will show how many gallons per flush the model uses to do its job.

Also, if they have a WaterSense toilet label, odds are the WaterSense toilets have been certified for their performance and energy efficiency. However, if the toilet was made before 1992, it probably is not a GPF toilet and likely uses copious gallons of water for each flush. A lower GPF toilet is simply a more water-efficient toilet.

Read on for more useful information about GPF toilets and what you can expect.

What Is a Good GPF for a Toilet?

The average toilet needs about 1.6 gallons per flush, equating to about 9.1 gallons a day for the average person’s bathroom use. This may seem like an excessive waste of water, but it is a vast improvement on former toilet models. The current toilet standards came about in 1992 with the passing of the Energy Care Act, which abolished toilets that use more than 3.6 GPF.

If you go back even further to before 1980, most toilets used about 5-8 gallons per flush which meant that the average person was using about 48 gallons a day on the throne. However, there are now more energy-efficient solutions than the 1.6 GPF toilets, namely the newest 1.28 GPF models.


What Does a 1.28 GPF Toilet Mean?

From the outside, a 1.28 GPF toilet looks the same as a 1.6 GPF toilet or any other toilet for that matter. The differences are all in the internal mechanics, and you will only really notice the differences in your overall water usage. As one can tell by the number, a 1.28 GPF toilet uses around 33.3333% of a gallon less than the classic 1.6 GPF toilet.

You may wonder how much water this will end up saving per day? Well, if the average American flushes about five times a day, accounting for roughly 25% of their daily water usage, then you will see that a 1.28 GPF toilet will save you a mean of close to 2 gallons of water per day.In and of itself, this is highly impressive.

However, if you account for the number of people using your toilet per day at your home, the amount of water you conserve per day only comes up.

A 1.28 GPF toilet will save you 10 gallons more per day in a family of five than a 1.6 GPF toilet can. Per annum, this adds up to approximately 3650 gallons of water. This is both environmentally friendly and cheaper on the wallet. Additionally, the 1.28 toilets are also often nice and quiet, which can be a huge benefit if you want to use the bathroom at night without waking up the entire household.

Is a 1.6 or 1.28 Toilet Better?

Although the 1.28 GPF toilets is a high-efficiency flushing toilet when it comes to water conservation, it is not so simple as one being better than the other. While the 1.28 GPF toilet will save you a lot of water per flush, there are a few drawbacks.

Firstly, the low-volume flushes using less water may cause some problems when it comes to fully cleaning the bowl. Sometimes, when less water is used for flushing down the waste, some waste stains might not wash down with the flush. This is especially an issue when it comes to solid waste and toilet paper. Often, you may need to flush multiple times to fully bring all the waste down and perhaps get rid of any waste skid marks that cannot wash out with limited water.

While this problem is easily solved by flushing more than once, this does sort of negate the added value of conserving more water per flush. If you must flush twice, you end up using 2.56 gallons which is more than you would need with one flush with a 1.6 GPF toilet.

On the plus side, though, many 1.28 GPF toilet makers have sought to address this problem with new power flushes that can cleanse the bowl with the same low-volume flush. This helps quite a bit but still does not always fully get rid of all the skid marks.

On the other hand, if you use a 1.6 GPF toilet, you will likely have a more powerful flush. While they use nearly 2 gallons more water consumption per day than a 1.28 GPF toilet, they are more efficient with their flushes. The 1.6 GPF toilets rarely need more than one powerful flush to fully cleanse the toilet bowl each time, which means you will not have to spend too much time every week cleaning out those nasty skid marks.

However, unlike the 1.28 GPF toilets, these high efficiency toilet models are often quite loud, and this can be a nuisance for other members of the household who may wake up at night every time someone flushes the toilet.

Frequently Asked Questions (FAQ)

What toilet is best for not clogging?

As a rule, the more powerful the flush, the less likely it is to clog. By that logic, a 1.6 GPF toilet will likely be less likely to cause clogging. However, clogging usually occurs because of what you put in the toilet, not just the flush power.

What is the best toilet to save water?

One of the best toilets to save water is Mansfield toilets, which are highly efficient and perform better than the average commercial toilet. They also have an elongated toilet seat for more comfortable seating.

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