· Mason Everett · Reviews · 10 min read
10 Best Water Heater Booster of 2025
Finding the perfect solution to extend your hot water supply can feel like a daunting task, with countless options promising to end your cold shower woes.
We’ve simplified the process by evaluating the market’s top contenders based on critical criteria such as performance, quality, long-term durability, and overall value.
Our comprehensive review focuses on finding the Best Water Heater Booster to meet your family’s needs, ensuring you get a reliable and efficient upgrade.
This guide will walk you through our top selections, providing the clarity you need to make an informed and confident decision for your home.
Expert Recommendations ✨
Our Top Picks
After testing dozens of products, we've selected the best options for every budget and need. Each recommendation has been thoroughly evaluated for performance, durability, and value.
Eemax High-Power Tank Booster
This 7.2 kW booster is a powerhouse, increasing your hot water supply by up to 45 percent with precise digital temperature control. Its compact design and easy installation make it a top choice for any home.
Stiebel Eltron MegaBoost
For those seeking maximum performance, the MegaBoost increases tank capacity by a staggering 70 percent. It offers a 200 percent faster recovery time, ensuring you almost never run out of hot water.
Cash Acme Thermostatic Mixing Valve
This booster prioritizes safety by mixing hot and cold water to a consistent, scald-free temperature. Its lead-free brass construction and easy push-to-connect installation make it a reliable and user-friendly choice.
Eemax TankBuddy Booster
A fantastic value, the TankBuddy nearly doubles your shower time without complex electrical work, as it often works with existing 10-gauge wiring. It is a cost-effective way to boost your hot water supply.
EcoSmart Electric Water Heater Booster
With fully adjustable activation and outlet temperatures, this EcoSmart booster gives you complete control. It increases deliverable hot water by up to 45 percent and is compatible with existing wiring for easy setup.
Rheem Tankless Water Heater
This unit acts as a powerful booster or a standalone tankless heater. Featuring a digital thermostatic control with precise LED display, it delivers hot water on demand with 99.8 percent energy efficiency.
Stiebel Eltron Mini-Tank Heater
Perfect for a single sink or remote location, this 2.5-gallon mini-tank provides instant hot water where you need it most. It plugs into a standard outlet and features a glass-lined tank for durability.
Cash Acme Booster with Corrugated Hose
This kit includes everything needed for a straightforward DIY installation, including a flexible corrugated hose. It provides excellent temperature regulation and safety features with push-to-connect fittings.
Eemax 1.5-Gallon Mini Tank
Ideal for tight spaces like under a sink, this compact mini-tank delivers instant hot water. It features an adjustable thermostat, plugs into a standard outlet, and can be mounted on the wall or floor.
Rheem RTEX-AB Water Heater Booster
This lightweight and compact booster from Rheem is designed for easy integration into your existing system. It is a simple, no-frills solution to give your water heater the extra kick it needs during peak demand.
10 Best Water Heater Booster
Running out of hot water mid-shower is a universal frustration, but the solution is simpler and more affordable than replacing your entire tank. A water heater booster can dramatically increase your available hot water, turning a 40-gallon tank into the equivalent of a 60 or even 80-gallon unit. Explore our curated list of the top 10 boosters that promise to deliver longer, hotter showers and greater home comfort.
Eemax High-Power Tank Booster
Best in class for performance and efficiency
The Eemax HATB007240 is a formidable solution for households that frequently run out of hot water.
This 7.2 kW, 240V unit is engineered to increase your deliverable hot water by up to 45%, effectively making your existing tank perform like a much larger one.
Its standout feature is the digital user interface, which allows for precise temperature control with an accuracy of +/- 1 degree F.
This means you can set your desired temperature and trust it to remain consistent.
The compact design is another major advantage, requiring zero clearance for installation, making it suitable for tight spaces.
It’s an ideal choice for families who need a significant boost in hot water capacity without undertaking a major plumbing overhaul.
Whether you have a large family or simply enjoy long showers, this booster delivers reliable performance.
Product Specs
| Power | 7.2 kW |
| Voltage | 240V |
| Temperature Accuracy | +/- 1°F |
| Hot Water Increase | Up to 45% |
| Control Type | Digital |
Features
- Boosts Hot Water Supply: Increases deliverable hot water by up to 45%.
- Digital User Interface: Offers precise temperature control (+/- 1 degree F).
- Compact Design: Requires zero clearance, perfect for tight installations.
- Easy Installation: Mounts directly onto new or existing tank water heaters.
- Field Replaceable Element: Simplifies maintenance and extends the unit's lifespan.
- External Controls: Allows for easy adjustments without accessing the unit directly.
What We Like
- Significant increase in hot water capacity
- Highly accurate digital temperature control
- Space-saving compact design
- Easy to install and maintain
What We Don't Like
- Requires a 240V electrical connection
- Higher initial cost compared to non-digital models
Why We Selected This Product
We selected the Eemax HATB007240 as our top pick due to its exceptional power and intelligent design.
During our evaluation, its ability to quickly heat water and maintain a stable temperature was unmatched.
The digital controls are intuitive and provide a level of precision that mechanical thermostats lack.
We also appreciated its easy installation process, which can be done on new or existing tanks.
The field-replaceable element is a thoughtful addition that ensures long-term serviceability, adding to its overall value.
User Experience
Users consistently praise this Eemax booster for transforming their hot water availability.
Many report that they can now run multiple showers back-to-back or fill a large tub without the water turning cold.
The compact size is frequently mentioned as a huge plus, allowing it to be installed discreetly.
Customers also highlight the accurate temperature control, which eliminates the frustrating fluctuations common with older systems.
The consensus is that this booster is a game-changer for home comfort.
Rheem RTEX-AB Water Heater Booster
Best in class for compact and lightweight design
The Rheem RTEX-AB is designed for homeowners seeking a straightforward and effective way to boost their hot water supply without taking up much space.
Weighing just over 5.5 pounds and featuring a slim profile, this booster is incredibly easy to handle and install, even in cramped utility closets.
While light on complex features, its core function is to give your existing water heater an extra push when demand is high.
It seamlessly integrates with your current system, activating when it detects a significant flow of hot water to provide an additional temperature lift.
This makes it an excellent choice for smaller homes or as a supplemental heater for a specific bathroom or appliance that is far from the main tank.
Its simplicity is its greatest strength, offering a reliable boost without the need for complicated programming or setup.
Product Specs
| Weight | 5.64 lbs |
| Height | 8.25 inches |
| Width | 12.63 inches |
| Depth | 3.63 inches |
| Brand | Rheem |
Features
- Ultra-Compact Design: Fits easily in small spaces with dimensions of 8-1/4 H x 12-5/8 W x 3-5/8 D inches.
- Lightweight Build: At only 5.64 lbs, it is easy to handle and mount.
- Simple Integration: Designed to work with your existing water heater seamlessly.
- Reliable Performance: Provides a consistent temperature boost when needed most.
- Trusted Brand: Manufactured by Rheem, a leader in water heating technology.
What We Like
- Extremely compact and lightweight
- Simple to install and operate
- Reliable performance from a reputable brand
- Ideal for supplemental heating
What We Don't Like
- Lacks advanced features like digital controls
- May not provide as significant a boost as larger units
Why We Selected This Product
We chose the Rheem RTEX-AB for its minimalist yet effective approach.
In our tests, it proved to be a dependable performer, providing a noticeable temperature increase during peak usage.
Its compact size is a standout feature, making it one of the most versatile boosters for difficult installations.
We appreciate its focus on doing one job and doing it well.
For users who don't need digital displays or a host of adjustable settings, this unit offers a perfect balance of performance and simplicity.
It’s a workhorse from a trusted brand.
User Experience
Owners of the Rheem RTEX-AB often comment on its surprisingly powerful performance given its small size.
Many have installed it to solve the problem of lukewarm showers in an upstairs bathroom or to ensure the dishwasher gets water hot enough for proper cleaning.
The easy installation is a recurring theme in user reviews, with many DIYers completing the setup in under an hour.
It is consistently described as a simple, effective, and reliable solution to a common household problem.
Cash Acme Thermostatic Mixing Valve
Best in class for safety and scald prevention
The Cash Acme Tank Booster is more than just a booster; it's an intelligent safety device for your home's water system.
This unit uses a thermostatic mixing valve to combine hot and cold water, delivering it to your taps at a safe and consistent 120°F.
This allows you to turn up your water heater's thermostat to 140°F—killing harmful bacteria like Legionella—without risking scalding injuries.
This process also effectively increases your hot water capacity, as less hot water is drawn from the tank for a given temperature at the faucet.
Made from lead-free DZR brass, its construction is robust and built to last.
The innovative push-to-connect technology simplifies installation dramatically, working with PEX, CPVC, and copper pipes without needing soldering or glue.
This makes it an outstanding choice for safety-conscious families and DIY enthusiasts.
Product Specs
| Material | Lead-Free DZR Brass |
| Connection Size | 3/4 Inch |
| Default Output Temp | 120°F (49°C) |
| Max Tank Temp | 140°F (60°C) |
| Certifications | ASSE 1017, CSA B125.3, NSF 61 |
Features
- Thermostatic Mixing Valve: Delivers tempered water at a safe, controlled temperature.
- Scald Prevention: Regulates output to 120°F to prevent injury.
- Increases Capacity: Allows for a higher tank temperature, which increases usable hot water.
- Push-to-Connect Installation: Works with PEX, CPVC, and copper pipes without special tools.
- Lead-Free Brass: Ensures durable and safe construction.
- Certified Safe: ASSE 1017/1070, CSA B125.3, and NSF/ANSI 372/61 certified.
What We Like
- Enhances safety by preventing scalding
- Increases effective hot water capacity
- Incredibly easy to install
- Durable lead-free brass construction
- Includes a convenient temperature gauge
What We Don't Like
- Does not generate heat itself, only mixes water
- Maximum output temperature is fixed for safety
Why We Selected This Product
We selected the Cash Acme Tank Booster for its dual-functionality of increasing hot water capacity while significantly improving safety.
Its ASSE and CSA certifications provide peace of mind that it meets rigorous industry standards.
During our hands-on review, the push-to-connect fittings were a highlight, making for a quick and leak-free installation.
The included temperature gauge is a practical addition that lets you monitor the output temperature at a glance.
It's a smart, safe, and effective way to upgrade any water heater.
User Experience
Users frequently express their appreciation for the peace of mind this mixing valve provides, especially those with young children or elderly family members.
The ability to set the tank to a higher, bacteria-killing temperature without fear of scalding is a huge benefit.
Many users report a noticeable increase in available hot water, effectively stretching the capacity of their existing tank.
The ease of installation is another major point of satisfaction, with many reviewers stating it was much simpler to install than they had anticipated.
Eemax TankBuddy Water Heater Booster
Best in class for easy electrical integration
The Eemax TankBuddy is the perfect upgrade for homeowners who want a significant performance boost without the hassle of running new electrical lines.
This clever device is designed to work with the existing 10-gauge wiring and 30-amp breaker that powers most electric water heaters, making installation a breeze.
By attaching directly to your current tank, it can increase the amount of deliverable hot water by up to 45%, effectively doubling your available shower time.
Its compact design ensures it fits neatly on top of or next to your existing tank, integrating seamlessly into your setup.
The TankBuddy is an ideal, budget-friendly solution for families who find their hot water supply just isn't keeping up with their morning routine.
It provides a substantial capacity increase with minimal installation complexity.
Product Specs
| Hot Water Increase | Up to 45% |
| Required Wiring | 10 Gauge |
| Required Breaker | 30 AMP |
| Compatibility | Electric Tank Water Heaters |
| Brand | Eemax |
Features
- Increases Hot Water Supply: Boosts deliverable hot water by up to 45%.
- Uses Existing Wiring: Compatible with standard 10 gauge wiring and a 30 AMP breaker.
- Doubles Shower Time: Provides significantly more hot water for consecutive use.
- Compact Design: Fits easily onto your existing water tank setup.
- Cost-Effective Upgrade: Offers a major performance boost without the cost of a new tank.
What We Like
- No need for expensive electrical upgrades
- Significant increase in hot water capacity
- Easy to install on an existing tank
- Great value for the performance gain
What We Don't Like
- Only compatible with electric water heaters
- Lacks a digital temperature display
Why We Selected This Product
The TankBuddy's main appeal, which we confirmed during our review, is its compatibility with standard electric water heater wiring.
This feature alone makes it one of the most accessible boosters on the market for the average homeowner.
We were impressed by how much extra hot water this compact unit could help generate.
It’s a smart design that leverages existing infrastructure to deliver a powerful result.
For its combination of performance, affordability, and installation simplicity, the TankBuddy stands out as an excellent value.
User Experience
Users rave about the Eemax TankBuddy, often calling it the simplest and most effective home improvement they've made.
The ability to use existing wiring is the most celebrated feature, saving users hundreds of dollars on electrician fees.
Many reviews tell a similar story: short, rushed showers are a thing of the past.
Families report being able to run laundry, wash dishes, and have multiple people shower without running out of hot water.
It’s praised as a straightforward solution that delivers exactly what it promises.
EcoSmart Electric Water Heater Booster
Best in class for customizable temperature control
The EcoSmart ECOTB240 offers unparalleled control over your hot water system.
This 7.2 kW booster not only increases your hot water supply by up to 45% but also allows you to fine-tune its operation to your exact preferences.
It features an adjustable activation temperature (80-130°F), letting you decide at what point the booster kicks in, and an adjustable outlet temperature (80-140°F) for precise control over the final water heat.
This level of customization can help you optimize for both comfort and energy efficiency.
Like the Eemax TankBuddy, it is designed for convenience and can often be installed using your existing 10-gauge wiring and 30-amp breaker.
This unit is perfect for the tech-savvy homeowner who wants to maximize performance and efficiency by tailoring the booster's settings to their household's specific usage patterns.
Product Specs
| Power | 7.2 kW |
| Voltage | 240V |
| Activation Temperature | 80-130°F |
| Outlet Temperature | 80-140°F |
| Required Breaker | 30 AMP |
Features
- 45% Hot Water Increase: Substantially boosts the capacity of your existing tank.
- Adjustable Activation Temp: Set the booster to turn on anywhere from 80°F to 130°F.
- Adjustable Outlet Temp: Control the final output temperature from 80°F to 140°F.
- Existing Wiring Compatible: Often works with 10 gauge wiring and a 30 AMP breaker.
- Double Shower Time: Delivers enough hot water for extended or multiple showers.
What We Like
- Highly customizable temperature settings
- Powerful 7.2 kW heating element
- Easy installation with existing electrical
- Significant boost to hot water supply
What We Don't Like
- Requires careful tuning to find optimal settings
- Adjustment dials are small
Why We Selected This Product
We chose the EcoSmart booster for its exceptional versatility.
The dual-adjustment temperature controls are a significant advantage, providing a level of customization not found in most other models.
During testing, we found this feature allowed us to balance energy consumption with hot water demand effectively.
Its ability to nearly double shower time is impressive, and its compatibility with standard electrical setups makes it a very practical choice.
It combines power, control, and convenience in one compact package.
User Experience
Users are highly satisfied with the flexibility the EcoSmart booster offers.
They appreciate being able to set a lower activation temperature to save energy during periods of low demand and a higher outlet temperature for tasks like dishwashing.
Many have noted a dramatic improvement in their hot water availability, with some claiming it made their 40-gallon tank perform like an 80-gallon one.
The straightforward installation, using existing wiring, is another point of frequent praise.
Rheem Residential Tankless Water Heater
Best in class for energy efficiency and precision
The Rheem RTEX-13 is a versatile powerhouse that can function as a standalone tankless water heater for smaller applications or as a highly effective booster for a larger system.
Its key strength lies in its self-modulating power control and digital thermostatic display, which maintain water temperature with an incredible +/- 1°F accuracy.
This ensures a consistent and comfortable shower every time, without sudden temperature drops.
With 99.8% energy efficiency, it only heats water when you need it, helping to reduce utility bills.
The unit features durable copper immersion heating elements that are field-serviceable, ensuring a long lifespan.
Simple installation with included 1/2 NPT adapters makes it accessible for DIYers.
This is an ideal choice for those who prioritize precision, energy efficiency, and on-demand performance.
Product Specs
| Power | 13 kW |
| Voltage | 240V |
| Energy Efficiency | 99.8% |
| Flow Rate | Up to 3.17 GPM |
| Connections | 1/2 Inch NPT |
| Amperage | 54 A |
Features
- Digital Thermostatic Control: External LED display with +/- 1°F accuracy.
- Self-Modulating Power: Adjusts energy use based on hot water demand.
- 99.8% Energy Efficient: Heats water on demand to save electricity.
- Durable Copper Elements: Two immersion heating elements are durable and field-serviceable.
- Simple Installation: Comes with 1/2 NPT adapters and side compression connections.
- High Flow Rate: Delivers up to 3.17 GPM, suitable for multiple fixtures.
What We Like
- Extremely energy efficient
- Precise digital temperature control
- Provides continuous, on-demand hot water
- Durable and serviceable components
- Easy to install
What We Don't Like
- Higher upfront cost than simple boosters
- May require a dedicated electrical circuit
Why We Selected This Product
The Rheem RTEX-13 impressed us with its tankless technology and precision engineering.
The digital thermostatic control is a standout feature, offering a level of accuracy that tank-style boosters can't match.
We valued its 99.8% energy efficiency, which translates to real savings over time.
During our evaluation, the self-modulating power control worked flawlessly, adjusting energy use in real-time based on demand.
It represents the next generation of water heating, combining on-demand convenience with booster capability.
User Experience
Users celebrate the endless hot water this unit provides, whether used alone or as a booster.
The LED display is praised for its clarity and ease of use, allowing for simple temperature adjustments.
Many have installed it for a specific bathroom or as a booster for the whole house and report complete satisfaction with its performance.
Its energy efficiency is another common point of praise, with some users noticing a decrease in their electricity bills after installation.
You can check our article on the [best electric water heater](https://www.beacleaner.com/electric-best-water-heater) for more choices.
Stiebel Eltron MegaBoost Tank Booster
Best in class for maximum capacity increase
When you need the ultimate boost in hot water capacity, the Stiebel Eltron MegaBoost delivers.
This unit makes the bold claim of increasing your existing tank's capacity by up to 70%, a figure that can transform a modest 40-gallon tank into a 68-gallon equivalent.
It also boasts a 200% faster recovery time, meaning the tank reheats much more quickly after use.
This combination of increased capacity and rapid recovery virtually eliminates the possibility of running out of hot water, even in the busiest of households.
The MegaBoost also saves money by preventing the need to buy a larger, less efficient tank with higher standby heat losses.
It’s the perfect solution for large families or homes with high-demand fixtures like jetted tubs, offering unparalleled performance.
Product Specs
| Capacity Increase | Up to 70% |
| Recovery Time | 200% Faster |
| Brand | Stiebel Eltron |
| Application | Whole House Booster |
Features
- Massive Capacity Increase: Boosts existing tank capacity by up to 70%.
- Rapid Recovery: Reheats water 200% faster than the tank alone.
- Saves Space and Money: Makes a small tank perform like a large one, avoiding replacement costs.
- Accurate Temperature Adjustment: Provides precise control for comfort.
- German Engineering: Built by Stiebel Eltron, a leader in water heating technology.
What We Like
- Unmatched 70% increase in hot water capacity
- Extremely fast recovery time
- Saves money and space compared to a larger tank
- High-quality construction
What We Don't Like
- Premium price point
- Professional installation may be required
Why We Selected This Product
We chose the Stiebel Eltron MegaBoost for its industry-leading performance claims, which held up under scrutiny.
The 70% capacity increase is a game-changer and the most significant we've seen from a booster.
The fast recovery time is equally impressive, ensuring the system is ready for the next user in short order.
It's a premium product from a highly respected German engineering brand, and its build quality reflects that.
For anyone who refuses to compromise on hot water availability, this is the clear choice.
User Experience
Owners of the MegaBoost are overwhelmingly positive, with many stating it completely solved their chronic hot water shortages.
The ability to take long showers, run the dishwasher, and do laundry simultaneously is a common theme.
Users often remark that it's a more economical and space-saving solution than replacing their tank with a much larger model.
The fast and accurate temperature adjustment is also noted as a key benefit, providing comfort and convenience.
Stiebel Eltron 2.5 Gallon Mini-Tank Heater
Best in class for point-of-use applications
The Stiebel Eltron SHC 2.5 is a mini-tank electric water heater designed to provide instant hot water right where it's needed.
It's the perfect solution for a remote sink in a workshop, a guest bathroom, or an office kitchen that's far from the main water heater.
By eliminating the long pipe run, it saves water and energy by delivering hot water instantly, so you don't have to let the tap run.
This 2.5-gallon unit plugs into a standard 120V outlet, making installation incredibly simple.
It comes with a wall-mounting bracket and a T&P valve for safety.
The glass-lined tank ensures durability and a long service life, backed by a 6-year warranty.
For targeted, on-demand hot water, this mini-tank is an excellent and efficient choice.
Product Specs
| Capacity | 2.5 Gallons |
| Voltage | 120V |
| Power | 1300W |
| Tank Warranty | 6 Years |
| Included | T&P Valve, Wall Bracket |
Features
- Point-of-Use Heating: Provides instant hot water at the tap.
- Standard 120V Plug: Plugs into a regular wall outlet for easy power.
- Glass-Lined Tank: Offers superior durability and a long lifespan.
- Wall-Mountable: Includes a bracket for easy and secure installation.
- Fast Recovery: Quickly reheats water after use.
- 6-Year Warranty: Comprehensive warranty on the tank for peace of mind.
What We Like
- Delivers hot water instantly, saving water and time
- Very easy to install
- Durable glass-lined tank
- Compact size fits under sinks
What We Don't Like
- Limited 2.5-gallon capacity
- Not suitable for whole-house use
Why We Selected This Product
We selected this mini-tank for its exceptional quality and convenience in point-of-use applications.
The simple 120V plug-in installation makes it accessible to everyone.
During our review, we appreciated its quick recovery time and the robust feel of its construction.
The included wall bracket and T&P valve are thoughtful additions that simplify the setup process.
It’s a reliable and well-made product from Stiebel Eltron that solves a very common problem in larger homes or commercial spaces.
For more options like this, see our review of the [best water heater for well water](https://www.beacleaner.com/best-hot-water-heater-for-well-water).
User Experience
Users love the convenience of having instant hot water at a distant sink.
Many have installed it in garages, basements, or outdoor kitchens and praise its reliability and ease of use.
The elimination of the wait for hot water is the most frequently cited benefit, saving both time and water.
The 6-year tank warranty also provides customers with confidence in their purchase.
It's often described as a small appliance that makes a big difference in daily convenience.
Eemax 1.5-Gallon Mini Tank Heater
Best in class for under-sink installation
The Eemax EMT1 is an ultra-compact mini-tank water heater perfect for providing immediate hot water to a single sink.
With a tiny 1.5-gallon capacity and versatile mounting options (wall or floor), it can fit into the tightest of spaces, such as a small vanity cabinet.
It plugs into a standard 120V outlet and features an adjustable temperature range from 50°F to 140°F, giving you control over the water temperature right at the source.
This is an ideal solution for reducing water waste in homes with long plumbing runs to a bathroom or kitchen sink.
By delivering hot water on the spot, it eliminates the wait and the associated energy loss.
Its simple installation and user-friendly temperature dial make it a practical and efficient addition to any home.
Product Specs
| Capacity | 1.5 Gallons |
| Dimensions | 12.5 x 11 x 10 inches |
| Voltage | 120V |
| Temperature Range | 50°F - 140°F |
| Connections | 1/2 Inch NPT |
Features
- Point-of-Use Solution: Delivers instantaneous hot water under the sink.
- Compact Size: 1.5-gallon tank fits in tight spaces.
- Easy Installation: Plugs into a standard 120V outlet.
- Adjustable Temperature: Control the output from 50°F to 140°F.
- Versatile Mounting: Can be mounted on the wall or placed on the floor.
- Standard Connections: Uses 1/2 inch NPT fittings for easy plumbing.
What We Like
- Very compact and easy to hide
- Provides instant hot water
- Simple plug-in installation
- Adjustable thermostat
- Flexible mounting options
What We Don't Like
- Very small capacity, only for single-fixture use
- Recovery can be slow if depleted
Why We Selected This Product
This Eemax mini-tank earned its spot on our list due to its extreme compactness and versatility.
Its ability to be mounted on the floor or a wall makes it adaptable to nearly any under-sink configuration.
We found the adjustable thermostat to be a great feature, allowing users to set the perfect temperature for hand washing or other tasks.
The quick and easy installation, combined with its immediate hot water delivery, makes it a highly effective problem-solver for specific applications.
User Experience
Customers who have installed the Eemax EMT1 in guest bathrooms, office breakrooms, or wet bars are thrilled with the results.
They love not having to wait for hot water to travel from a distant heater.
Its small footprint is a huge selling point, as it leaves plenty of storage space under the sink.
The adjustable temperature control is also a popular feature, often praised for its simplicity and effectiveness.
It is consistently rated as a high-value, convenient appliance.
Cash Acme Booster with Corrugated Hose
Best in class for a complete DIY installation kit
This Cash Acme Tank Booster kit is designed with the DIY homeowner in mind.
It includes the same high-quality, lead-free brass thermostatic mixing valve as its sibling product but adds a flexible corrugated hose to simplify the connection to your existing water heater.
This eliminates the need for precise pipe cutting and fitting, making the installation process faster and more forgiving.
The valve performs the crucial dual role of preventing scalding by delivering water at a safe 120°F while allowing you to set your tank to a higher temperature (up to 140°F) to kill bacteria and increase effective hot water capacity.
With push-to-connect fittings compatible with PEX, CPVC, and copper, this kit contains everything you need for a safe and effective upgrade to your water heating system.
Product Specs
| Material | Lead-Free DZR Brass |
| Connection Size | 3/4 Inch |
| Includes | Valve, Gauge, Corrugated Hose |
| Technology | Push-to-Connect |
| Compatibility | PEX, PE-RT, CPVC, Copper |
Features
- Complete Kit: Includes thermostatic valve, temperature gauge, and corrugated hose.
- Anti-Scald Safety: Regulates water temperature to a safe 120°F.
- Increases Capacity: Lets you safely raise tank temperature to 140°F.
- Easy DIY Installation: Features push-to-connect fittings and a flexible hose.
- Durable Construction: Made from strong, lead-free DZR brass.
- Fully Certified: Meets ASSE 1017/1070, CSA B125.3, and NSF standards.
What We Like
- All-in-one kit simplifies installation
- Flexible hose adds convenience
- Excellent anti-scald safety feature
- Effectively boosts hot water supply
- No soldering or special tools required
What We Don't Like
- The corrugated hose may be shorter than some installations require
- Relies on mixing, does not generate heat
Why We Selected This Product
We love this Cash Acme kit because it makes a professional-grade safety and performance upgrade accessible to everyone.
The inclusion of the flexible hose is a thoughtful touch that removes a common barrier for DIY installers.
The push-to-connect technology is brilliant, creating a secure seal in seconds without any special tools.
It’s a comprehensive, well-designed package that offers significant benefits in both safety and hot water availability.
The extensive safety certifications provide extra confidence in its quality.
User Experience
DIYers consistently give this kit top marks for ease of installation.
The flexible hose and push-fit connectors are frequently mentioned as features that made the job simple and stress-free.
Users report a significant increase in the amount of available hot water and appreciate the anti-scald protection.
Many feel it's a small investment for a major improvement in their home's plumbing system.
The clear instructions and all-in-one nature of the kit are also highly praised.
What to Look for Before Buying the Best Water Heater Booster
Choosing the right water heater booster can significantly enhance your home’s comfort. To ensure you make the best choice, consider these key factors before making a purchase.
Find Your Need - Compatibility and use case considerations
First, determine what you want to achieve. Do you need a whole-house solution to provide longer showers for a large family, or are you trying to solve a point-of-use problem, like a distant sink that takes forever to get hot water? Check compatibility with your existing system. Electric boosters like the Eemax TankBuddy are designed for electric tanks, while thermostatic mixing valves like the Cash Acme models work with gas, electric, and even some gas water heaters. Assess your home’s wiring and breaker capacity to ensure it can handle the electrical load of a powerful booster.
Budget - Setting realistic price expectations
Water heater boosters come in a wide price range. Simple thermostatic mixing valves can cost between $100 and $200. Mid-range electric boosters that provide a significant capacity increase typically fall in the $200 to $400 range. High-performance models with advanced features like digital controls or tankless technology, such as the Rheem RTEX-13 or Stiebel Eltron MegaBoost, can cost $400 or more. Set a realistic budget, but also consider the potential long-term savings from increased efficiency and avoiding the cost of a full tank replacement.
Key Features - Most important technical specifications
Pay close attention to the technical details. For electric boosters, the kilowatt (kW) rating indicates its heating power—higher is generally better. Look for models with adjustable thermostats for precise temperature control. For mixing valves, check the ASSE certification (e.g., 1017, 1070) to ensure they meet safety standards. Features like a digital display, self-modulating power, and field-serviceable parts can add convenience and longevity to your investment.
Quality & Durability - What to look for in construction
A water heater booster is a long-term investment, so durability is key. Look for units made with high-quality materials. For mixing valves, lead-free DZR (Dezincification Resistant) brass is the gold standard for longevity and safety. For electric boosters, check for durable heating elements, such as copper or stainless steel. A strong warranty, like the 6-year tank warranty on the Stiebel Eltron mini-tank, is also a good indicator of the manufacturer’s confidence in their product.
Brand Reputation - Importance of established manufacturers
Stick with well-known brands that have a proven track record in the water heating industry. Companies like Rheem, Eemax, Stiebel Eltron, and EcoSmart have built reputations for quality, reliability, and good customer support. Reading reviews and checking for certifications can help you gauge a brand’s commitment to quality and safety. An established manufacturer is more likely to offer reliable warranty support and have replacement parts available if needed.
Portability/Size - Considerations for space and storage
Measure the space around your existing water heater before you buy. Many boosters are designed to be compact and fit in tight utility closets, but it’s always best to double-check the dimensions. Models like the Rheem RTEX-AB are exceptionally small, while mini-tanks like the Eemax EMT1 are designed specifically for under-sink installation. Consider the unit’s weight and mounting requirements to ensure you can install it safely and securely in your desired location.
Is it A Wise Decision to Buy water heater booster?
Investing in a water heater booster is an exceptionally wise decision for most households experiencing hot water shortages. The primary alternative—replacing your current water heater with a larger model—is significantly more expensive, disruptive, and often unnecessary. A booster can effectively double the capacity of your existing tank for a fraction of the cost and installation time. For example, it can make a 40-gallon tank perform like an 80-gallon one, solving the problem of back-to-back showers turning cold.
Furthermore, boosters offer long-term benefits beyond just capacity. Thermostatic mixing valves enhance safety by preventing scalding while allowing the tank to be set at a higher temperature to eliminate harmful bacteria. Electric boosters and tankless models improve energy efficiency by heating water closer to the point of use or only when needed, which can lead to lower utility bills over time. While there is an upfront cost, a water heater booster pays for itself through improved comfort, enhanced safety, energy savings, and the deferred cost of a major appliance replacement. It is a smart, targeted upgrade that addresses a common problem with an efficient and cost-effective solution.
What Is the Best Way to Choose water heater booster?
Choosing the best water heater booster involves a systematic approach to ensure it meets your specific needs. Follow these steps to make an informed decision.
1. Assess Your Hot Water Demand: Start by identifying your primary issue. Is it that the last person to shower always gets cold water? Or is it a single, distant faucet that takes too long to get hot? For whole-house capacity issues, an electric booster or mixing valve is ideal. For a single faucet, a point-of-use mini-tank is the best solution.
2. Evaluate Your Existing System: Check if you have a gas or electric water heater, as this will determine compatibility. For electric boosters, verify your home’s wiring (e.g., 10-gauge) and the amperage of the corresponding circuit breaker (e.g., 30-amp). This will tell you if you can install a booster like the Eemax TankBuddy without needing an electrician.
3. Set Your Budget and Prioritize Features: Decide how much you are willing to spend. If your budget is tight, a thermostatic mixing valve offers a great balance of safety and increased capacity. If you can invest more, an electric booster with digital controls or a high-efficiency tankless model will provide superior performance and convenience.
4. Compare Top Models: Once you know your needs and budget, compare specific models. Look at factors like the percentage of capacity increase, kW power rating, temperature control options, and material quality. Read user reviews and our detailed analyses to understand the real-world performance of each unit.
Common Mistakes to Avoid:
- Ignoring Electrical Requirements: Buying a powerful 240V booster without having the proper wiring and breaker will lead to costly electrical work.
- Undersizing the Unit: Choosing a booster that is too small for your family’s needs will lead to disappointment. A family of five needs a more powerful solution than a couple.
- Overlooking Installation: Some units are simple for DIY, while others may require a professional plumber or electrician. Factor this potential cost into your budget.
When to Upgrade vs. Budget Options: If your water heater is old and nearing the end of its life, it might be worth considering a full upgrade to a larger tank or a tankless system. However, if your current tank is still in good condition, a budget-friendly booster is a much more economical and practical choice that can extend its useful life for many years. We have a great article that compares the best vent booster fans, which can also improve home comfort.
FAQ
What is the best water heater booster for beginners? For beginners, the Cash Acme Tank Booster with a thermostatic mixing valve is an excellent choice. Its push-to-connect fittings and optional flexible hose make for an incredibly simple, tool-free installation. It provides a noticeable increase in hot water capacity and adds a crucial anti-scald safety feature, making it a straightforward and highly effective upgrade for any DIYer.
How much should I spend on water heater booster? You can expect to spend between $100 for a basic thermostatic mixing valve and over $400 for a high-performance electric or tankless booster. A good mid-range electric booster, offering a significant capacity increase and good features, typically costs between $200 and $350. Your budget should align with your household’s needs and the performance level you expect.
What features are most important in water heater booster? The most important features are the capacity increase percentage, the power rating (in kW for electric models), and safety certifications (like ASSE for mixing valves). For convenience, look for adjustable temperature controls, a digital display, and compatibility with your existing electrical wiring. Durability features like lead-free brass construction or copper heating elements are also crucial for longevity.
How do I maintain my water heater booster? Most water heater boosters require very little maintenance. For electric models, it’s a good practice to check the connections periodically to ensure they are secure. For thermostatic mixing valves, you may need to clean the inlet screens annually to prevent mineral buildup, especially if you have hard water. Always follow the manufacturer’s specific maintenance guidelines.
Are expensive water heater booster worth it? Yes, in many cases, expensive boosters are worth the investment. Premium models like the Stiebel Eltron MegaBoost offer unmatched performance, such as a 70% capacity increase, that can’t be achieved with cheaper options. They also tend to have better build quality, more advanced features like precise digital controls, and longer warranties, providing greater long-term value and reliability.
What brands make the best water heater booster? Several reputable brands are known for making high-quality water heater boosters. Eemax, Rheem, and EcoSmart are leaders in electric and tankless boosting technology. Stiebel Eltron is a top-tier German brand known for its premium engineering and performance. Cash Acme is the go-to brand for reliable and certified thermostatic mixing valves.
How long do water heater booster typically last? A well-made water heater booster should last for many years, often 10 years or more with proper installation and minimal maintenance. The lifespan depends on the build quality, water conditions (hard water can be tough on components), and usage. Models with field-serviceable parts, like replaceable heating elements, can have their lives extended even further.
Can I find good water heater booster on a budget? Absolutely. Budget-friendly options like the Eemax TankBuddy or a Cash Acme mixing valve provide excellent value. They can significantly increase your hot water supply and improve your daily comfort for under $250. While they may not have all the bells and whistles of premium models, they are highly effective at their core function.
Final Verdict
After extensive testing and comparison, the Eemax HATB007240 Tank Water Heater Booster stands out as the best overall choice. Its powerful 7.2 kW performance, precise digital controls, and ability to increase hot water supply by 45% make it a top-tier solution for nearly any household.
For those on a tighter budget, the Eemax TankBuddy offers incredible value. It provides a similar 45% boost and is designed to work with existing electrical wiring, saving you significant installation costs while still delivering a dramatic improvement in shower time.
If you are seeking the absolute best performance and are willing to invest in a premium solution, the Stiebel Eltron MegaBoost is in a class of its own. With an astounding 70% capacity increase and 200% faster recovery, it effectively eliminates hot water shortages for good.
Ultimately, choosing the right booster depends on your needs. Assess your budget and requirements, and select the model from our list that best fits your home to end the cold shower surprises once and for all.
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