· tanks and amp reservoirs · 13 min read
Best Water Heater Expansion Tanks: Top 5 Picks for 2024
Discover the best expansion tanks for water heaters, carefully evaluated and reviewed to ensure reliable performance. Our top picks guarantee durability, sustained pressure levels, and safeguard your water systems.
In the realm of plumbing systems, expansion tanks play a pivotal role in safeguarding water heaters from pressure fluctuations. These crucial components absorb excess pressure created by expanding water, preventing tank damage. Our team has meticulously analyzed the market's offerings to present the top 5 water heater expansion tanks for 2024. These expertly curated choices guarantee卓越 performance and longevity, ensuring your water heating system operates effortlessly.
Overview

PROS
- Protects against thermal expansion and pressure buildup, preventing premature water heater failure and floods
- Made with durable, corrosion-resistant materials for a long-lasting solution
- Pre-charged at 75 psi for easy installation and hassle-free maintenance
CONS
- May require professional assistance for installation
- Requires periodic inspection and maintenance to ensure optimal performance
Introducing the PH5 FLEX2PRO Thermal Expansion Tank, an essential safeguard for your water heater. This 2.1-gallon tank effectively absorbs thermal expansion, protecting your heater from potentially catastrophic ruptures and floods. Constructed with durable, corrosion-resistant materials, it ensures long-lasting performance. Pre-charged at 75 psi, installation is a breeze, allowing for immediate use.
The FLEX2PRO Tank proactively combats thermal expansion, a natural process that occurs as water heats up. By absorbing this excess pressure, it prevents stress on your water heater and subsequent damage. Moreover, its robust construction withstands harsh water conditions, ensuring years of reliable service. However, it's worth noting that installation may require professional assistance, and periodic inspection and maintenance are crucial for optimal results.

PROS
- Maintains optimal water pressure in closed loop systems, preventing system damage due to thermal expansion.
- Pre-pressurized at 12 psi, reducing installation time and complexity.
CONS
- May require periodic maintenance to check pressure and ensure proper functionality.
- In rare cases, the diaphragm may fail, leading to pressure loss.
The Amtrol T-5 THERM-X-SPAN Expansion Tank is an indispensable component for closed-loop water heating systems, safeguarding against potential hazards caused by thermal expansion. Its pre-pressurized design of 12 psi streamlines the installation process, eliminating the need for manual pressurization. Furthermore, the tank's sturdy construction ensures longevity and resistance to corrosion, guaranteeing years of reliable performance.
As a crucial aspect of water heater maintenance, the Amtrol T-5 Expansion Tank proactively addresses pressure fluctuations, preventing system failures and extending the lifespan of your water heater. By accommodating the expansion of heated water, it safeguards against leaks and property damage, providing peace of mind and uninterrupted hot water availability.

PROS
- Effectively absorbs pressure surges within plumbing systems, preventing pipe bursts and leaks.
- Rugged construction ensures durability and longevity, offering reliable performance over time.
CONS
- May require professional installation for optimal functionality.
- Available in limited sizes, which may not suit all plumbing configurations.

PROS
- Pre-assembled kit for easy installation
- Durable construction for longevity
- Protects water heater from thermal expansion and reduces strain
- Corrosion-resistant materials prevent premature failure
- Compact design fits in tight spaces
CONS
- May require professional installation
- Limited warranty coverage
The Apollo FSBTANKKIT Water Heater Expansion Tank Kit is a comprehensive solution for safeguarding your water heater system against thermal expansion. This pre-assembled kit includes everything you need for a quick and hassle-free installation, ensuring your water heater operates optimally for years to come.
Constructed from robust materials, the expansion tank withstands high pressures and temperatures, guaranteeing long-lasting performance. Its primary function is to absorb excess water volume created by heating, protecting your water heater from potential damage caused by excessive pressure buildup. Additionally, the tank minimizes strain on the heater, extending its lifespan significantly.

PROS
- Provides enough potable water capacity for up to 50-gallon water heaters
- Crafted from durable materials for extended lifespan, ensuring clean drinking water
CONS
- Installation may require additional fittings or accessories
- May not be suitable for high water pressure systems
Ensure a steady supply of clean, potable water with CMI's Expansion Tank. Specifically designed for water heaters up to 50 gallons, this tank provides crucial expansion capacity, safeguarding your water system. Constructed from durable materials, it effectively withstands the rigors of daily use and ensures the longevity of clean drinking water in your home.
The compact design of this water heater expansion tank allows for easy installation, fitting seamlessly into various water heater setups. Its versatility makes it an ideal choice for residential or commercial applications where clean and reliable drinking water is paramount. Upgrade your water system with the CMI Expansion Tank and experience the peace of mind that comes with accessing safe and clean drinking water.

PROS
- Extended water heater lifespan by absorbing expansion pressure
- Corrosion-resistant stainless steel construction ensures longevity
CONS
- May require professional installation for optimal functionality
The Easyflex EF-TET is an exceptional thermal expansion tank designed to protect your water heater from excess pressure buildup. Elegantly crafted from durable stainless steel, this tank resists corrosion, guaranteeing a reliable performance for years to come. Its 3/4″ MIP connection simplifies installation, making it compatible with most water heater systems.
With a generous 2-gallon capacity, the Easyflex expansion tank effectively manages thermal expansion caused by temperature fluctuations in your water heater. By absorbing excess pressure, it safeguards your heater from potential damage and extends its life. Whether you're a seasoned plumber or a DIY enthusiast, the Easyflex EF-TET is an ideal choice for upgrading your water heating system. Its robust construction, coupled with its compact design, makes it an excellent investment for homeowners looking to enhance the efficiency and longevity of their water heaters.

PROS
- Ensures optimal plumbing system performance by safeguarding against thermal expansion
- Generously sized 4.5-gallon capacity accommodates high-volume water systems
- Meets NSF/ANSI 61 standards, ensuring potable water safety for your family
- Durable steel construction ensures longevity and resists corrosion
- Pre-installed fittings simplify installation and save time
CONS
- May require additional space for installation due to its larger size
- Some users have reported minor leaks at the fittings, requiring extra sealing
The Watts Water Technologies 67371 PLT-12 4.5-Gallon Potable Water Expansion Tank is an essential component for safeguarding your plumbing system and ensuring its seamless functioning. Its generous 4.5-gallon capacity makes it ideal for high-volume water systems, while its durable steel construction guarantees longevity and corrosion resistance. The pre-installed fittings streamline the installation process, saving you time and effort.
This expansion tank conforms to NSF/ANSI 61 standards, ensuring that the water remains safe for consumption. By accommodating thermal expansion, the Watts water expansion tank prevents pressure buildup, protecting your pipes and fixtures from damage. Its larger size may require additional installation space, and some users have encountered minor leaks at the fittings, necessitating additional sealing measures. Overall, the Watts 67371 PLT-12 is a reliable and effective solution for safeguarding your plumbing system, ensuring years of trouble-free operation.

PROS
- Effectively handles thermal expansion in potable water lines, preventing excessive pressure buildup.
- Reliable and durable construction ensures long-lasting performance and optimal water system functionality.
- Compact design (12 gallons) fits conveniently in tight spaces, making it suitable for various installations.
CONS
- Installation requires plumbing expertise and may necessitate additional components.
- Regular maintenance checks are recommended to ensure optimal functionality and longevity.
The Watts DET-12-M1 Potable Water Expansion Tank is an essential solution for effectively managing thermal expansion in potable water heating systems. Its durable construction and compact design make it a reliable choice for residential and commercial applications. The 12-gallon capacity ensures adequate expansion control, preventing excessive pressure buildup that can damage water lines and appliances. Installation is straightforward, requiring plumbing expertise, but additional components may be necessary depending on the specific setup. Regular maintenance checks are recommended to uphold optimal performance and extend the lifespan of the expansion tank. Overall, the Watts DET-12-M1 is a highly recommended water heater expansion tank that provides peace of mind and ensures the longevity of your water heating system.
By choosing the Watts DET-12-M1 water heater expansion tank, you not only safeguard your plumbing system but also make a wise investment in protecting your water heater and appliances. Its compact size allows for easy installation, even in limited spaces, making it an ideal solution for various residential and commercial applications. With its reliable performance and durable construction, the Watts expansion tank will provide years of worry-free operation, ensuring the smooth functioning of your water heating system.

PROS
- Ensures optimal water heater performance by compensating for thermal expansion.
- Prevents excessive pressure buildup, safeguarding your water heater from potential damage or leaks.
- Boosts system efficiency, leading to reduced energy consumption and lower heating costs.
- Durable construction guarantees longevity and unwavering performance.
- Easy installation and maintenance, making it a convenient choice for DIY enthusiasts.
CONS
- Regular pressure checks are necessary to maintain optimal functionality.
Introducing the Permaspan PSC-2X 2 Gallon Potable Water Expansion Tank, an essential safety measure for the efficient operation of your water heater. This tank is designed to accommodate the natural expansion of heated water, preventing excessive pressure buildup that can lead to catastrophic failures or costly repairs. Crafted from durable materials, the Permaspan PSC-2X ensures可靠性and longevity, delivering peace of mind and safeguarding your household's water system. Its compact size and simple installation make it an ideal solution for both residential and commercial applications.
By absorbing excess water pressure, the Permaspan PSC-2X plays a crucial role in maintaining the integrity of your water heater. It efficiently compensates for thermal expansion, preventing stress on tank seams and connections, which can compromise the system's performance and safety. Furthermore, it minimizes energy consumption by ensuring optimal operating conditions, helping reduce utility bills while contributing to environmental sustainability.

PROS
- NSF Certified for safety and reliability
- 4 Gallon capacity provides ample storage for most reverse osmosis systems
- Compact design seamlessly fits into tight spaces
- 1/4" Tank Ball Valve for effortless maintenance
CONS
- No additional accessories or fittings included
- May require specialized knowledge or tools for installation
Introducing the tankRo RO132-TNK RO Water Filtration System Expansion Tank, your trusted partner for exceptional water storage in reverse osmosis systems. This NSF Certified tank ensures the highest standards of purity and safety, safeguarding your family's health. Its 4 Gallon capacity offers ample storage, effortlessly accommodating most reverse osmosis systems. The compact design makes it an ideal solution for space-constrained areas, seamlessly fitting into tight corners or under-the-sink installations. The 1/4" Tank Ball Valve allows for straightforward maintenance and ensures effortless discharge when necessary.
Whether you're a seasoned plumber or a DIY enthusiast, the tankRo RO132-TNK is designed for ease of use. Its straightforward installation process minimizes hassle, allowing you to integrate it seamlessly into your existing water filtration system. Experience the unparalleled quality of tankRo, where innovation meets reliability. Upgrade your water storage solution today with the tankRo RO132-TNK and enjoy the benefits of pure, refreshing water for years to come.
For impeccable performance, the PH5 FLEX2PRO Thermal Expansion Tank reigns supreme. Its robust construction and unique design provide unwavering pressure management, guaranteeing extended service life. If space constraints pose a challenge, the compact brilliance of the Watts DET-12-M1 Potable Water Expansion Tank makes it an ideal choice. With its exceptional build quality, this tank safeguards your water heater from excessive pressure, ensuring continuous hot water availability. The Amtrol T-5 THERM-X-SPAN Expansion Tank is a compelling option for larger water heaters, skillfully handling pressure fluctuations and delivering unparalleled durability. For those seeking a value-driven choice, the CMI Inc 2.1 G Potable Expansion 50 Gallon Heater Tanks-Safe & Clean Drinking Water stands out. Its affordable price and reliable performance make it a smart investment for budget-conscious homeowners. Finally, the Easyflex EF-TET-2 Stainless Steel Thermal Expansion Tank's innovative design and corrosion-resistant construction provide exceptional longevity, ensuring trouble-free operation for years. No matter your specific requirements, our curated list will guide you to the perfect expansion tank for your water heater, ensuring optimal performance and peace of mind.
Frequently Asked Questions
What is the purpose of a water heater expansion tank?
A water heater expansion tank is designed to absorb excess pressure created by expanding water, preventing damage to the water heater tank.
How do I choose the right size expansion tank for my water heater?
The appropriate size of an expansion tank depends on the capacity of the water heater. A general rule of thumb is to select a tank that is approximately 10% of the water heater's capacity.
What are the benefits of using a water heater expansion tank?
Installing an expansion tank safeguards your water heater from excessive pressure, extending its lifespan, minimizing the risk of leaks, and ensuring a reliable supply of hot water.
How often should I inspect my water heater expansion tank?
Regular inspections every few months are recommended to ensure the tank is functioning correctly. Checking for leaks, proper pressure levels, and any visible damage helps maintain optimal performance.
Can I install a water heater expansion tank myself?
While installing an expansion tank is generally straightforward, it's advisable to consult a qualified plumber to ensure it is fitted correctly and meets local building codes.