Is a 20 Gallon Pressure Tank Adequate?

February 18, 2024

Water tank

If you are thinking about buying a new pressure tank, there’s a lot to consider. The first question you need to ask yourself is: what size of a tank do I need? This answer depends on a few factors like the size of your home and the number of fixtures you have.

Generally, a 20 gallon pressure tank is big enough for most homes. There are still other questions such as: do you want a steel or a plastic tank, what type of valve do you need, and how often do you plan to fill up the tank? We’ve put together a handy guide that takes all these factors into account.

What is a Pressure Tank?

black and yellow oxygen tank at daytime

A pressure tank, also known as a water tank, is a container used to store pressurized water. The pressure tank creates water pressure by regulating the amount of water that is allowed to flow into your home from the municipal water supply. Most homes have a pressure tank that is sized anywhere from 20 gallons to 80 gallons. Larger tanks are available, but they are not common in residential applications.

What Size of a Pressure Tank Do I Need?

When it comes to sizing your pressure tank, you want to make sure you get one that’s big enough to meet your needs. But what qualifies as “big enough”? Well, that depends on a few factors, including the size of your home, the number of appliances you have that use water, and the peak flow rate of your water system. In general, a 20-gallon tank is a good starting point for most homes.

Your tank should be big enough to provide you with plenty of water pressure and avoid any drop in pressure during peak demand times. But if you have a larger home or more appliances, you may need a larger tank. Speak to a qualified plumber to get a better idea of what size of a tank is right for you.

The Benefits of Using a 20-Gallon Pressure Tank

Using a large pressure tank can offer several benefits depending on the specific application. Here are some advantages of using a large pressure tank:

  • A large tank allows for greater storage capacity of liquid or gas. This can be advantageous in industries where there is a need for large volume of compressed air, water, or other fluids.
  • It can help stabilize pressure fluctuations in a system. It acts as a buffer, absorbing excess pressure during periods of high-demand, and releasing stored pressure during low-demand periods. This helps maintain a consistent pressure and flow rate, minimizing the risk of system failure or performance issues.
  • The system can run at a steady state with a slower cycling rate. This reduces the number of starts and stops for compressors or pumps that are typically energy-intensive processes. Consequently, energy consumption can be optimized, resulting in cost savings and improved efficiency.
  • Overall operation can be more stable and less prone to frequent pressure fluctuations. This can help reduce wear and tear on system components, such as pumps, valves, and pressure switches, leading to lower maintenance requirements and extended equipment life.
  • In certain applications, it can serve as an emergency backup or reserve supply. For example, in water supply systems, it can provide a temporary water source during power outages or when the primary supply is interrupted. Similarly, in pneumatic systems, it can offer a reserve air supply to keep critical processes operational during unexpected downtime.
  • Large pressure tanks are often built with robust construction materials and designed to withstand high pressure. This ensures the containment of hazardous or volatile substances, enhancing overall safety in industrial processes.

Factors to Consider Before Buying a 20 Gallon Pressure Tank

Before you buy a 20-gallon pressure tank, there are a few important factors to consider.

water drop on bucket photo

  • Check to make sure your water well can support the extra pressure. A 20-gallon tank will be pushing the limits of most water wells, so it’s essential that you confirm your well is capable of handling it.
  • You shouldn’t exceed the maximum pressure your plumbing system can handle. Most commercial and residential systems can handle up to 80 pounds per square inch (PSI). Any more than that and you risk damaging your pipes and causing leaks. If that’s not something you’re comfortable with, then a smaller tank may be best for you.
  • The size of the tank should meet your needs. If you have multiple bathrooms in your home or rely on a lot of water for daily activities, a 20-gallon tank may be too small. In this case, it’s probably worth investing in something larger for greater capacity and performance.
  • The type of material it’s made from is also important. Steel and fiberglass are the two most popular materials used to make pressure tanks, but they each have their pros and cons. Steel pressure tanks are known for their durability and strength, but can be prone to rust over time. On the other hand, fiberglass pressure tanks are incredibly strong yet lightweight, and don’t corrode easily. However, fiberglass tanks can be more expensive than steel tanks. Steel pressure tanks typically come with a 1-year warranty while fiberglass tanks offer a 10-year warranty.

Installation Tips

Installing a large pressure tank requires specialized tools. It’s best to hire a professional if you don’t know what you’re doing. However, for those who want to tackle the job themselves, here are some tips to make sure you get it right.

First of all, make sure your tank is placed on a level surface and bolted down securely so it doesn’t move or shift. Next, ensure that there is sufficient space around the tank so that maintenance technicians can access it easily and safely. You’ll also want to install an outlet valve, pressure relief valve, and check valve, as well as other fittings as needed.

Finally, you’ll need to fill the tank with water according to your manufacturer’s instructions. This is typically done by connecting the tank to your water source and then slowly filling it until the pressure reaches its maximum level. Once the right pressure has been achieved, water can be turned off, and all fittings should be checked for leaks before use.

Our Pick: iSpring TM20M

The iSpring T20M 20 Gallon Pre-Pressurized Tank is a reliable and high-quality storage solution designed specifically for Reverse Osmosis (RO) systems. With its impressive 14-gallon water storage capacity, this tank ensures a steady supply of purified water for your household or business.


  • Exceptional Water Storage. With a generous 14-gallon water storage capacity, the iSpring T20M tank provides ample space to store purified water, ensuring a continuous supply, even during peak usage periods.
  • Reliable and Tested Quality. The tank is made of top-quality materials that have been tested by third-parties independently to meet the standards of NSF and ANSI. This ensures the durability and safety of the tank for long-term use.
  • Comprehensive Kit. The iSpring T20M tank comes with everything you need for easy installation and setup. The kit includes a shut-off valve, tank connector, and tank stand, allowing for hassle-free integration into your existing RO system.
  • Versatile Installation. This tank offers flexibility in positioning as it efficiently works both vertically or horizontally. You can choose the installation method that best suits your space and preferences.
  • Efficient Customer Service. iSpring stands behind their products and offers exceptional customer service. By registering online, you can activate your warranty from the manufacturer and receive lifetime free technical support. Should any issues arise, the iSpring team is dedicated to providing prompt assistance and ensuring your satisfaction.


  • Size Consideration. The iSpring T20M tank has dimensions of 16″L x 16″W x 30″H that should be taken into account when planning for installation. Ensure you have adequate space available to accommodate the tank in your desired location.


The answer to this question largely hinges on your specific requirements. For those utilizing the pressure tank in a modest-sized dwelling or a cabin, a 20-gallon unit should suffice. However, for more extensive households or multiple appliances, a more substantial tank is necessary. Prior to making a purchase, it's crucial to assess the intended use of the pressure tank. After thorough consideration, you can then select the size that aligns optimally with your needs. For those interested in enhancing their online presence, especially on platforms like TikTok, exploring options to buy TikTok views can be an effective strategy.


What is a pressure tank, and what is its purpose?

A pressure tank is a component of a well water system that stores water under pressure. Its main purpose is to provide consistent water pressure and reduce the frequency of the well pump cycling on and off.

Why is the article focused on a 20-gallon pressure tank specifically?

The article focuses on a 20-gallon pressure tank as a reference point to discuss its adequacy in various situations. It aims to help readers determine whether a 20-gallon tank is suitable for their specific water system needs.

Is a 20-gallon pressure tank suitable for residential use?

A 20-gallon pressure tank can be adequate for residential use, depending on factors like household water demand, well pump capacity, and the number of occupants. The article provides guidance on assessing whether it’s the right size for your home.

How do I determine the appropriate size of a pressure tank for my needs?

The article likely offers guidance on how to calculate the appropriate pressure tank size based on factors such as water usage patterns, well pump size, and desired pressure settings. It’s crucial to size the tank correctly for efficient operation.

Can a 20-gallon pressure tank support multiple water fixtures simultaneously?

The ability of a 20-gallon pressure tank to support multiple fixtures simultaneously depends on the overall water demand and the tank’s size. The article likely discusses this and offers insights on managing water usage effectively.


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