Top 5 Water Heater Tank Boosters Reviewed

Steve Donaldson Master HVAC technician
Steve Donaldson
Master HVAC technician at Quality Comfort Home Services

I am Steve Donaldson, a Master HVAC technician with a rich background in addressing heating issues, especially when it comes to various types of water heaters. Leveraging my extensive expertise, I offer insights and advice to help individuals maintain a warm and secure home environment. Reach out to me at steve.donaldson@tedreviews.com for valuable tips from a seasoned professional in the industry.

Steve Donaldson Master HVAC technician
Steve Donaldson
Master HVAC technician at Quality Comfort Home Services

I am Steve Donaldson, a Master HVAC technician with a rich background in addressing heating issues, especially when it comes to various types of water heaters. Leveraging my extensive expertise, I offer insights and advice to help individuals maintain a warm and secure home environment. Reach out to me at steve.donaldson@tedreviews.com for valuable tips from a seasoned professional in the industry.

Hey there! In this post, I'll be sharing my expert insights on the top 5 water heater tank boosters available on the market. If you're looking to enhance the performance and efficiency of your water heater, this is the post you don't want to miss. So, let's dive right in and discover the best options out there!

1
Eemax Tank Water Heater Booster
9.1
2
Stiebel Eltron MegaBoost Water Heater
Conclusion: Efficient and versatile
BUY NOW Amazon.com
7.5
3
Rheem RTEX-AB Booster
Reliable and convenient
BUY NOW Amazon.com
7.3
5
Eemax TankBuddy Heater Booster
Impressive and convenient
BUY NOW Amazon.com
5.7
1

Eemax Tank Water Heater Booster

$331.31  in stock
Amazon.com
as of September 30, 2025 10:27 pm
9.1
The Eemax HATB007240 Tank Water Heater Booster is a compact and easy-to-install solution for increasing the hot water capacity in your home. With its digital user interface and adjustable settings, it offers temperature accuracy and the ability to deliver hot water even if the tank is cold. However, it may require electrical upgrades and the initial cooler water may trigger power cycling.
Efficiency Upgrade
  • Easy installation
  • Provides extra supply of hot water
  • Can increase hot water capacity by about 50%
  • Does not require running new wiring
  • Can deliver hot water even if the tank is cold
Limitations
  • May require electrical upgrades
  • Initial cooler water triggers power cycling

The Eemax HATB007240 Tank Water Heater Booster is a compact and efficient solution for increasing the deliverable hot water in your home. With a power output of 7.2 kW and a voltage of 240V, this booster is suitable for both commercial and residential water heater applications. It features a digital user interface and external controls for easy adjustment of settings, offering temperature accuracy of +/- 1 degree F. The booster is easy to install on new or existing tank water heaters and has a temperature range of 80 to 140 degrees F. Based on customer reviews, it can increase the supply of hot water by up to 45%, making it a great alternative to purchasing a larger water heater or installing a tankless system.

Enhance Your Hot Water Supply
  • Increased deliverable hot water up to 45%
  • Compact design with zero clearance requirements
  • Digital user interface
  • Temperature accuracy +/- 1 degree F
  • External controls for adjustable settings
  • Easy installation on new or existing tank water heater
$331.31
in stock
as of September 30, 2025 10:27 pm
Amazon.com
2

Stiebel Eltron MegaBoost Water Heater

 in stock
Amazon.com
7.5
Conclusion: Efficient and versatile
The Stiebel Eltron MegaBoost Tank Booster Water Heater is a space-saving and efficient solution that increases hot water capacity by up to 70%, providing endless hot water and improving water temperature for multiple showers. It can be easily installed and used in combination with a tankless water heater, extending the duration of hot water availability. However, some users found the return process confusing and the wiring connector on the water heater could be improved.
Advantages of MegaBoost
  • Provides endless hot water
  • Easy installation
  • Improves water temperature for multiple showers
  • Can be used in combination with a tankless water heater
  • Increases the duration of hot water availability
Limitations of MegaBoost Water Heater
  • Confusing return instructions and restocking fee
  • Wiring connector on the water heater could be improved

The Stiebel Eltron MegaBoost Tank Booster Water Heater is designed to provide more hot water for longer showers and shorten the recovery time of your hot water tank. It can be installed with any domestic hot water tank, making it a versatile choice for both new and existing systems. With its 100% efficiency, the MegaBoost achieves its boosting effect without wasting energy. You have the flexibility to install it on either the cold water inlet or the hot water outlet of your tank, depending on your specific needs. By installing the MegaBoost on the hot water outlet of a 30-gallon tank, you can enjoy 54% more hot water, while installing it on the cold water inlet can provide a whopping 71% more hot water. Not only does this mean more hot water for your showers, but it can potentially allow you to use a smaller tank, saving both space and money. The MegaBoost also offers fast and accurate hot water temperature adjustment for your convenience and comfort. Upgrade your hot water system with the Stiebel Eltron MegaBoost Tank Booster Water Heater and enjoy more hot water for your showers or longer showers without sacrificing space or energy efficiency.

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Efficient and Reliable Performance
  • Increased hot water capacity
  • Space-saving design
  • Quick and precise temperature adjustment
  • Boosts existing tank capacity by up to 70%
  • 200% faster heating
3

Rheem RTEX-AB Booster

$387.00
$342.80
 in stock
Amazon.com
as of September 30, 2025 10:27 pm
7.3
Reliable and convenient
The Rheem RTEX-AB Water Heater Booster is a compact and lightweight product made in the United States. It offers zero maintenance, quick hot water delivery, and has a simple to use interface, making it a cost-effective alternative to adding a second water heater. However, it may not take over immediately like a freshly charged water heater and may not significantly increase the temperature of the water despite increasing the volume. Overall, it is a reliable and convenient option for those looking to boost their water heater's performance.
Efficient Water Heating
  • Zero maintenance
  • Quick hot water delivery
  • Sturdy construction
  • Simple to use interface
  • Cost-effective alternative to adding a second water heater
Drawbacks
  • The booster may not take over immediately like a freshly charged water heater
  • Full water volume may not significantly increase the temperature of the water

The Rheem RTEX-AB Water Heater Booster is a convenient and efficient solution for those who need to increase the hot water capacity of their existing water heater. With an item weight of 8.5 lb and compact dimensions of 6.75″L x 10.3″W x 14.0″H, this booster is designed to be easily installed and takes up minimal space. It has received positive reviews for its effectiveness in providing hot water when needed, whether it's for filling a large soaking tub or ensuring quicker hot water delivery. Users have also mentioned its intuitive menu, sturdy construction, and low noise levels. Overall, the Rheem RTEX-AB Water Heater Booster offers an affordable and reliable way to enhance your hot water system.

Enhance Your Water Heating
  • Compact and lightweight design
  • Made in the United States
  • Brand name: Rheem
  • Convenient dimensions of 6.75″L x 10.3″W x 14.0″H
$342.80
$387.00
in stock
as of September 30, 2025 10:27 pm
Amazon.com
4

EcoSmart Electric Water Heater Booster

$349.00
$322.68
 in stock
Amazon.com
as of September 30, 2025 10:27 pm
7.1
In summary
The EcoSmart 7.2 kW Electric Water Heater Booster Model # ECOTB240 efficiently increases the amount of hot water available from your existing water heater, with an easy installation process and clear instructions. It maintains a desired temperature at the faucet and provides a significant temperature rise even at lower flow rates. However, it requires downsizing the connection and may trip a 30A circuit breaker if used at maximum power for a lengthy period.
Energy Efficient Solution
  • Efficiently increases the amount of hot water available from your existing water heater
  • Easy installation process with clear instructions
  • Can maintain a desired temperature at the faucet even as the water in the tank cools
  • Can be wired in series with the water heater to prevent exceeding the breaker's maximum rating
  • Provides a significant temperature rise even at lower flow rates
Drawbacks
  • Requires downsizing connection from 3/4″ to 1/2″, which may require additional components for installation
  • May trip a 30A circuit breaker if the unit hits 100% power usage for a lengthy period of time

The EcoSmart 7.2 kW Electric Water Heater Booster Model # ECOTB240 is a fantastic addition to your existing hot water tank. With SmartBoost technology, this booster increases the efficiency and performance of your tank by 45%, giving you more power and more hot water without the need for a larger tank. You can easily adjust the activation and outlet temperatures to suit your preferences, and it even doubles your shower time. Although there have been a few installation challenges reported, once installed correctly, this booster provides a significant improvement in hot water delivery.

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Enhance Your Water Heating Efficiency
  • Compatible with 10 gauge wiring and 30 AMP breaker
  • Increases deliverable hot water up to 45%
  • Adjustable activation temperature range of 80-130F
  • Adjustable outlet temperature range of 80-140F
  • Doubles shower time
$322.68
$349.00
in stock
as of September 30, 2025 10:27 pm
Amazon.com
5

Eemax TankBuddy Heater Booster

$323.85  in stock
Amazon.com
as of September 30, 2025 10:27 pm
5.7
Impressive and convenient
The Eemax TankBuddy Water Heater Booster Blue is an effective and user-friendly product that quickly raises water temperature and provides endless hot water for low-flow usage. It is compact, easy to install (with the right setup), and allows for filling large tubs with hot water. However, it can be noisy at higher flows.
Increased Water Temperature
  • Effective in raising water temperature quickly
  • Simple and user-friendly software
  • Provides endless hot water for low-flow usage
  • Good responsiveness and service from the manufacturer
  • Allows for filling large tubs with hot water
Drawbacks
  • Installation can be challenging if you don't have the ideal setup
  • The noise level can be bothersome, especially at higher flows

The Eemax TankBuddy Water Heater Booster Blue is a compact and efficient solution to increase the hot water capacity of any tank water heater. With its unique design, the TankBuddy can boost the delivery capacity of your tank by up to 45%, allowing you to enjoy more hot water for longer periods of time. Whether you have a 40-gallon tank or a larger one, the TankBuddy can provide the hot water capacity of a tank that is 20 gallons larger. Installation is simple, as you can directly attach the unit to the tank outlet or mount it on a nearby wall. If you already have a 30-amp electric water heater with 10 gauge wiring and a 30 AMP breaker, there is no need for additional electrical infrastructure. Say goodbye to running out of hot water and hello to longer showers and baths with the Eemax TankBuddy Water Heater Booster Blue.

Enhanced Heating Performance
  • Increases deliverable hot water up to 45%
  • No additional feed required if you have 10 gauge wiring & 30 AMP breaker
  • Nearly doubles shower time
  • Compact design, fits on existing tank
$323.85
in stock
as of September 30, 2025 10:27 pm
Amazon.com

Find the Perfect Water Heater Tank Booster for Your Needs!

  • Compatibility: Ensure that the booster is compatible with your existing water heater system. Check the specifications and requirements of the booster to ensure it will work seamlessly with your current setup. This includes checking the size, voltage, and connection types to ensure a proper fit
  • Energy Efficiency: Look for a booster that is energy efficient. A high-efficiency model can help reduce energy consumption and lower your utility bills. Look for features like insulation, adjustable temperature settings, and energy-saving modes to make your water heating more efficient and cost-effective
  • Safety Features: Prioritize safety when selecting a water heater tank booster. Look for models with built-in safety mechanisms such as temperature and pressure relief valves. These features help prevent overheating and excessive pressure buildup, which can be hazardous. Also, consider additional safety features like automatic shut-off systems and leak detection to minimize risks

Comparing Prices: Finding the Best Deal for Your Water Heater Tank Booster

  • The price range for water heater tank boosters usually varies between $30 and $150, depending on the brand, features, and quality
  • Basic models, priced around $30 to $50, offer simple temperature adjustments and can provide a modest increase in hot water output. These are suitable for individuals on a budget or those with smaller hot water needs
  • Mid-range boosters, priced between $50 and $100, often come with additional features like digital temperature displays, adjustable settings, and more advanced heating elements. They generally provide a higher level of performance and are ideal for households with average hot water demands
  • High-end water heater tank boosters, priced around $100 to $150, are designed for maximum efficiency and durability. These models often include advanced technology such as smart controls, energy-saving features, and enhanced insulation. They are best suited for larger households or those with higher hot water requirements
  • It's important to note that while higher-priced models may offer additional benefits and longer warranties, the best water heater tank booster for you will ultimately depend on your specific needs and budget
  • To make an informed decision, consider factors such as the size of your water heater, the desired temperature increase, energy efficiency, warranty coverage, and any additional features that may be important to you
  • It is also recommended to read customer reviews and compare different brands and models before making a purchase. This will help you find the best water heater tank booster that suits your requirements while providing good value for your money
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Enhance Your Water Heating System with the Water Heater Tank Booster!

Step-by-step guide to using the best water heater tank booster

  • Step 1: Check compatibility and installation requirements
  • Before purchasing a water heater tank booster, it's important to ensure that it is compatible with your existing water heater system. Read the product description or consult with a professional to determine if it will work for you. Additionally, check if any additional installation requirements are needed, such as tools or plumbing modifications
  • Step 2: Follow the installation instructions
  • Once you have the water heater tank booster, carefully read and understand the installation instructions provided by the manufacturer. Each product may have specific steps, so it's crucial to follow them accurately. If you're unsure about any step, don't hesitate to seek assistance from a professional plumber or contact the manufacturer's customer support
  • Step 3: Adjust and monitor the temperature
  • After installation, you can adjust the temperature of the water heater tank booster to your desired setting. Typically, there will be a dial or knob on the device to control the temperature. Start with a moderate setting and gradually increase or decrease it according to your preference. It's also important to regularly monitor the temperature to ensure it remains safe and comfortable for your needs
  • Remember, if you have any doubts or concerns during the process, it's always a good idea to seek professional guidance. Enjoy the benefits of your water heater tank booster and the improved efficiency of your water heating system!
Steve Donaldson Master HVAC technician
Steve DonaldsonMaster HVAC technician at Quality Comfort Home Services

I am Steve Donaldson, a Master HVAC technician with a rich background in addressing heating issues, especially when it comes to various types of water heaters. Leveraging my extensive expertise, I offer insights and advice to help individuals maintain a warm and secure home environment. Reach out to me at steve.donaldson@tedreviews.com for valuable tips from a seasoned professional in the industry.

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11 Comments
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  1. I found this roundup very helpful in narrowing down my options for a water heater tank booster. It provided a good overview of the top products available on the market. I especially appreciated the real-world application section, as it helped me understand how these boosters can be used in different scenarios.

  2. Based on the roundup, I think the Rheem RTEX-AB Booster would be perfect for my small apartment. Can anyone confirm its compatibility with a Rheem tankless water heater?

  3. Could you expand on the energy efficiency ratings of these water heater boosters? It would be useful to know how much energy they consume and if they have any energy-saving features.

  4. I’ve been using the Eemax Tank Water Heater Booster for a year now and it has made a noticeable difference in my hot water supply. Highly recommend it!

    • Thank you for sharing your experience! It’s great to hear that the Eemax Tank Water Heater Booster has worked well for you.

  5. I had a Stiebel Eltron MegaBoost Water Heater installed in my home a few months ago and it has been a game-changer. I never run out of hot water anymore, even with multiple showers running simultaneously.

  6. The roundup mentions some great options, but I think it would be helpful to include a few more budget-friendly choices as well. Not everyone can afford the higher-end models.

    • Thank you for your suggestion! I will definitely keep that in mind for future roundups and include more budget-friendly options.

  7. Great roundup! I can tell the author has done thorough research on each product. It would be even better if the author could provide more details on the installation process and compatibility with different types of water heaters.

    • Thank you for your feedback! I will definitely consider adding more details about installation and compatibility in future articles.

  8. Have you considered reviewing the latest models of these water heater boosters? It would be interesting to see if there have been any significant improvements or updates since this roundup was published.

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