Gravity Flush vs. Siphon Jet: Which One is More Powerful?

Are you making a new home or planning to renovate your house? Then I know you want a new bathroom with an utterly modern element and a stylish look. But now you are stuck with a simple flush system. Which one, gravity or siphon, will be the ideal match for your new bathroom? You are confused about this. Everyone passes through this confusion. But both flushes are now very popular for their many pros and cons.

Compare TermsSiphon FlushGravity Flush
Water Usage:1.6 GPF1.28 GPF
Clogging issue:CommonRare
Flushing Power:More powerfulStandard
Flush Type:ModernTraditional
Odor control:BestGood
Leave Skid Marks:NoYes
Required Installation Space:MoreLess
Stick Particles on the surface:NoYes

What is siphon flush?

Siphon Toilet Price

In this century, most people use siphon flushes in their toilets. Every person uses the washroom at the start of their day. But many people don’t know how water is used to clean their waste. Where did it come from? How does it work? This is a great invention of modern science. You have to accept it. Siphon system flushes are widely used all over the world.

It uses a vacuum system to pull human waste from the toilet bowl to the drainage pipe. There is an S-shaped trap attached to the bottom of the toilet. The front end is connected to the toilet bowl’s inlet portion, and the other is associated with the wastage pipe. This shape mainly creates siphons and clears the waste from the bowl. That’s why it’s called “siphon jet flush.”

How does a siphon jet flush work?

I think you noticed a lever-type flush attached to your toilet’s water tank. This liver is used to open the flush valve and let the tank flow water from the water tank attached to the toilet seat. In the siphon toilet, a vacuum is used to clear the waste from the bowl. At first, when you pull the lever, you notice the water rising into the bowl and then rapidly sinking into the bowl inlet pipe. Here, water is used to create a force on the waste to exit the bowl immediately.How Do Siphon Jet Action Toilets Work

After that, water also goes through the trapway at the bottom of the toilet, and it creates a vacuum by emptying the air inside it. When water flows over the trap way, the siphon starts its work. And then you notice the up-and-down situation of the water in the bowl. A swirl of water just washed away the wastage in a minute.

And in this siphon toilet, you need a minimum push to open the valve of water, which creates enough force to take away all the waste from the toilet bowl. If you end up with heavy debris in the toilet, don’t worry. This siphon can easily wash away everything from the bowl with a bubbly sound and in one flush. That’s how a siphon jet flush works.

Pros and Cons of Siphon Jet Flushing System

Most people worldwide use this siphon toilet flush in their restrooms. So there are many advantages to the face; that’s why this type of flush is popular. Let’s check some of their benefits and make your decision easier:


  • Bowl Clear: This type of flush efficiently clears your toilet bowl in one flush. 
  • Low maintenance: This type of washroom is designed with a versatile style. Many people can clean it without facing any problems. And the flush quality is also rugged enough to use for years without any worry.
  • Large water surface: This flus system contains a large water surface; that’s why you need one flush to clean up all mess, whether significant or not.
  • Silent system: Believe it or not, this siphon flush is the most silent flush system among all toilets. It just makes a minimum sound of flushing everything away from the bowl to the drainage pipe.
  • Less odor: It just washes away almost all smells with one push. There is a large amount of water used to flush the toilet. That’s why it just keeps your bathroom nearly wrong order-free immediately.
  • Easy to clean: Siphon flush is easy to keep clean and use. No complex element attaches to the toilet bowl or tank. So you can easily clean this every day.

When attaching a siphon jet flush in your washroom, these are the advantages you get. But you also face some problems when you start to use it regularly. Like:Are siphon Jet toilets better?


  • Use lots of water,
  • It has rim holes in the bottom of the toilet, which sometimes clogs there.
  • You can often face the runny water problem attached to the siphon flush with the water tank.
  • From another design flush, this siphon jet needs extra space to install. If your washroom is small, this is not the perfect choice for you.

There are a few problems you face using this siphon flush. But with a tremendous advantage, I think you can compromise this problem easily.

Top Siphon Jet Flush Toilets:

What is a Gravity Flush toilet?

From the name of this flush, I think you can guess that the flush system of this toilet is related to gravity. Yes, you are right. This gravity flush uses the force of gravity to clean up the bathroom. Surprisingly, no other mechanism is used. A few moving parts with a simple design make this prevalent flush day by day. And that’s why the repair process and expense are very high if it’s broken by any chance. This type of model is bare-bones rather than another pressure-assisted toilet. This type of toilet is getting popular because it uses less water per flush. And now almost everyone is careful about their environment—that’s why they try to use those great items for the earth.How a Standard Gravity-Flush Toilet Works

How Does A Gravity Flush work?

Now consider how gravity is used for flushing waste from your toilet bowl. It starts when you pull the flush of the toilet. There is a flapper that is raised off the toilet to open up the valve. With the help of gravity, the water from the tank came quickly and with great force. This force creates a rush into the bowl and washes away every waste from the bowl to the drainage pipe. After that, the water levels get low enough that the float ball starts working. It allows the pump to fill up the water tank to the brim. When the ball floats into the water, it automatically switches off to take any water from the pump. And that’s how the flush cleans the toilet bowl and again fills up the water tank without any external power, like electricity.

Benefits and Drawbacks of Gravity Flush Toilet

Using the gravity flush, you can face some benefits with some minor types of problems. And I think before choosing the most suitable toilet for your washroom, you need to know about this. It just helps to make the right decision.

Gravity Flush Toilet Price


  • Save water: the most fantastic part of this toilet is its less water usage. A gravity flush toilet uses 1.28 gallons of water per flush. On the other hand, a regular toilet uses 1.6 gallons of water per flush. And you know the difference between these two numbers. 
  • Minor clogs issue: The gravity system uses the direct flush method. There is no proneness in the middle of this. But the siphon is prone in its bowl. So the clogging problem is also sporadic in this type of flush. The trap pipe is also narrow, so sometimes, this also creates a clog. But the siphon uses lots of water with great force to clean the bowl. This power of water mainly prevents clogging.
  • Space Saver: A gravity flush system needs minimum space in your restroom. So you can easily fit this into your limited space.
  • Easy maintenance: A gravity toilet has a useless mechanism. So cleaning is effortless. When you can easily clean this, it doesn’t face any problems in the future. That’s why it’s very easy to maintain.
  • Budget-friendly: There are many kinds of gravity toilets available on the market. So it doesn’t matter if your budget is low or high.
  • Easy mechanism: This gravity toilet is not as complex as other toilets. Suppose you face any problems while using it. You can easily open this up and repair it yourself, saving water from waste and some money from your repair budget.

These are the advantages you get when installing a gravity-fed flush in your restroom. But don’t think you won’t face problems while using it. You meet some problems if you use it daily. Like:Pons and Cons Gravity flush toilet


  • This flush uses gravity with a great force of water. When you flush it, it creates loud noise in every color. That’s why it’s not a silent flush system.
  • This flush uses minimum water. That’s why you often notice the skid mark in your toilet bowl. And I know no one likes a spotted toilet.

These are the benefits and drawbacks of this gravity flush. No product came with the perfect solution. So if you want to use this type of flush, you also accept this problem.

Top Gravity Flush Toilets:

Siphon Vs. Gravity flush: What are the differences?

Let’s talk about their differences so that you can easily choose the right one for you.Different between Siphon and gravity flush Toilet

  • Water usage: The first and foremost fact about these two toilets is how much water is used per flush. As I told you before, a siphon uses 1.6-gallon water; on the other hand, a gravity flush uses 1.28 gallons per flush. So a gravity flush toilet uses less water than a siphon, saving the environment like this.
  •  Clogging issue: if you see the structure of this toilet, you can notice the drainage pipe of gravity flush is wider in the siphon. That is why the clog percentage is lower than the siphon. The little drainage pipe is prone to clog into your toilet many times. But it’s not most often the case. If you use the flush properly, I think you can overcome this problem.
  • Bad odor: this is the main difference between these two types of toilets. Gravity flush uses less water than siphon. That’s why it leaves a bad smell in the restroom. On the other hand, siphon flush uses more water with a great force, which flushes the waste and drains almost all ad smell from the place. 
  • Noise: gravity flush creates a loud sound after every flush. But from this side, the siphon remains silent. So if you don’t like this flush sound, go with the siphon.
  • Space: A siphon flush toilet needs more space than a gravity flush toilet. If you run out of room in your washroom, gravity is the best solution.
  • Maintaining: both flush cane with a simple design. So maintaining them is very easy. But the siphon uses more water with great force. That flushes away the wastage and also cleans the bowl. But Gravity uses less water, and sometimes it leaves a skid mark. From this side, the siphon is better than gravity.

Final Thought

Nowadays, siphon and gravity, both flushes, are very popular for some excellent reasons. If you want to save some money and there is little room for your toilet in the restroom, the gravity flush is perfect. But it would help if you accepted this flush’s loud noise and foul odor. If you don’t want this and have plenty of space in your restroom, you can easily pick the siphon one. But it uses more water than gravity. And both types of toilets are available on every budget, so it doesn’t matter if you are low or high on your sanitary budget. If it doesn’t bother you, feel free to choose your favorite one. Just learn the details about both flushes before buying one. Otherwise, it just doesn’t fulfill your highest demand.

Hi, this is Robert Crossan, the owner of this website, has 17 years of experience in the installation, maintenance, and repair of toilets and plumbing systems. After completing the Level 2 Basic Plumbing course in 2005, I started working in both domestic and commercial buildings as a professional plumber. So I can figure out the core difference between different toilet models and brands. It also helped me monitor their work performance and setbacks.

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