18 Best Water Softeners for Tankless Water Heaters

Discover the best water softener for tankless water heater, ensuring optimal performance and longevity for your home’s hot water system.
18 Best Water Softeners for Tankless Water Heaters

Top Quick Picks For You

Budget-Friendly Pick

Waterdrop Scale Inhibitor Filter

Waterdrop Scale Inhibitor Filter

The Waterdrop AP431 is an efficient scale inhibitor system that effectively reduces scale buildup and offers excellent value without breaking the bank.

Best for Appliance Longevity

Aquasure Harmony

Aquasure Harmony

The Aquasure Harmony Series protects appliances from hard water damage, significantly extending their lifespan and overall efficiency.

Best for Whole House

Aquasure Harmony

Aquasure Harmony

With its 48,000-grain capacity, the Aquasure Harmony Series provides comprehensive water softening for all areas of the home, ensuring quality and convenience.

Best for Easy Installation

Applied Membranes

Applied Membranes

The Applied Membranes Inc. Water Descaler offers straightforward installation and doesn't require any electricity or additional plumbing modifications.

Best Water Softener for Tankless Water Heater

Are you tired of battling mineral buildup in your tankless water heater? Finding the best water softener can transform your home into a haven of smooth-running appliances and luxuriously soft water. In this guide, we’ll navigate the essential features and top options, ensuring you make an informed choice that enhances both the efficiency and longevity of your water heating system.

Budget-Friendly Pick: Waterdrop Scale Inhibitor Filter

Waterdrop AP431 AP430SS Whole House Scale Inhibitor Filter, Heater Softener System, Prevent Scale Build Up On Hot Water Heaters, Pipes and Boilers
GoodNot So Good
Efficient scale inhibitionPossible thread leaks
High flow rateRequires regular maintenance
Durable stainless steelNot a traditional filter

We're excited to introduce the Waterdrop AP431, our Budget-Friendly Pick for the best water softener to pair with your tankless water heater .

This nifty little scale inhibitor is engineered with food-grade polyphosphates that work hard to keep your water healthy while drastically reducing scale buildup .

With a high flow rate of 10 GPM, it ensures consistent water pressure while protecting your appliances from the hidden foes of scale .

Plus, its robust 304 stainless steel construction means durability is a given .

While it requires some regular maintenance, the rewards are well worth it for your home's longevity and efficiency!

Be sure to also check out the best under sink tankless water heater for more options! Also, here is the price history so you know exactly when to buy!

Price history for Waterdrop Scale Inhibitor Filter on Amazon

Best for Appliance Longevity: Aquasure Harmony

Aquasure Harmony Series 48,000 Grains Whole House Water Softener w/High Efficiency Digital Metered Control Head (48,000 Grains)
GoodNot So Good
Highly efficient water treatmentInstructions could be clearer
Protects appliances from damageRequires chlorine removal system
Easy installation processMay need professional help

We’ve crowned the Aquasure Harmony Series as the “Best for Appliance Longevity” for good reason !

This powerhouse not only promises ultra-softened water but is specifically engineered for homes with 3-4 bathrooms .

It tackles up to 48,000 grains of hardness, banishing calcium and magnesium that sabotage your skin and appliances .

With its triple-purpose pre-filter, it wipes out 99% of harmful contaminants, extending the life of your essential gadgets .

The programmable digital control head makes maintenance a breeze, while the robust build ensures durability .

Just note, clearer instructions would be a nice touch .

Overall, we think Aquasure is a fantastic investment for your home!

Be sure to also check out the best pump for flushing tankless water heater for more options! Also, here is the price history so you know exactly when to buy!

Price history for Aquasure Harmony on Amazon

Best for Easy Installation: Applied Membranes

Applied Membranes Inc. Water Descaler for Tankless Water Heater and Whole-House Scale Protection
GoodNot So Good
Extends appliance lifespanInitial cost may be high
No electricity requiredRequires regular maintenance
Easy installationDepends on water hardness

We're excited to highlight the **Applied Membranes Inc .

Water Descaler**, our choice for the Best for Easy Installation !

This amazing product is an absolute game-changer for anyone with hard water or aging plumbing .

It's designed to extend the life of your tankless water heater and various appliances while ensuring hassle-free maintenance .

With durable steel construction and no need for electricity, you can enjoy clean water without the burden of salt or chemicals .

Plus, the simple installation process means you'll be up and running in no time .

Whether your water is hard or not, this unit might just be the perfect fit for your home!

Be sure to also check out the best clarifier for salt water pool for more options! Also, here is the price history so you know exactly when to buy!

Price history for Applied Membranes on Amazon

Aqua-Pure

3M Aqua-Pure Whole House Scale Inhibition Inline Water System AP430SS, Prevents Scale Build Up On Hot Water Heaters and Boilers
GoodNot So Good
Inhibits scale build-upRequires additional installation parts
Extends appliance lifePossible initial leaks
Easy cartridge replacementNot a water filter

When it comes to maintaining the efficiency of your tankless water heater, the Aqua-Pure AP430SS could be your new best friend .

This ingenious system injects polyphosphates into your water, effectively inhibiting scale build-up and protecting all your water-using appliances .

We love that it not only extends their lifespan but also keeps your hot water flowing smoothly .

Plus, with its high flow rate of up to 10 gpm, you won’t sacrifice water pressure !

While it requires some additional installation parts, the easy cartridge replacement makes maintenance a breeze .

Just remember, it’s a scale reduction system, not a filter, so temper your expectations accordingly.

Be sure to also check out the best spray paint for stainless steel for more options! Also, here is the price history so you know exactly when to buy!

Price history for Aqua-Pure on Amazon

AQUA CREST AP431

AQUA CREST AP431 AP430SS Whole House Scale Inhibitor - Inline Water System, Prevents Scale Build Up On Hot Water Heaters, Pipes and Boilers
GoodNot So Good
Efficient scale inhibitionShort lifespan
Energy savingPotential calcium deposits
Easy installationRequires regular maintenance

When it comes to keeping your tankless water heater running smoothly, the AQUA CREST scale inhibitor is a smart choice .

With its food-grade polyphosphate, it efficiently combats limescale formation and even adds a protective layer to your plumbing .

We appreciate the energy savings that come from extending the lifespan of appliances; no one likes constant repairs !

The 304 stainless steel adapters promise durability, and installation is a breeze—just maintain an upright position during setup .

While it has a shorter lifespan that requires regular maintenance, its high flow rate of 10 GPM ensures a steady water supply .

Overall, it’s a handy addition to your home!

Be sure to also check out the best tds meter for drinking water for more options! Also, here is the price history so you know exactly when to buy!

Price history for AQUA CREST AP431 on Amazon

LLNDEI Descaler Water Softener for Tankless Water Heater

LLNDEI Salt Free Water Descaler, Tankless Water Heater Descaler for Eliminating Scale & Rust, Power-Free, Anti Bacteria, Used in Different Kinds of Pipes
GoodNot So Good
Advanced descaling technologyLimited customer reviews
Power and chemical freeService life may vary
Easy installationSome installation expertise needed

We’re excited to introduce the LLNDEI Salt-Free Water Descaler, a true game-changer for your tankless water heater !

With advanced technology utilizing a special multi-component alloy, this system effectively reduces scale formation by over 87% .

Not only does it prevent future buildup, but its activated water can also dissolve existing scale—all without the need for chemicals .

Imagine the ease of installation between any pipe types, and best of all, it’s maintenance-free !

While some installation expertise might be useful, we believe this durable system, boasting a lifespan of at least a decade, is worth every penny for your home.

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Price history for LLNDEI Descaler on Amazon

Qoddxx Descaler

Tankless Water Heater Descaler - Quart (32 oz) Premium Descaler for Tankless Water Heater Systems, Highly Effective Descaler Restores Heating Efficiency, Easy Use
GoodNot So Good
Highly effective descaling solutionNot for aluminum surfaces
Extends equipment lifespanRequires annual maintenance
Safe and easy to useMay have strong odor

When it comes to caring for your tankless water heater, we can't recommend this highly effective descaling solution enough !

This 32 fl oz powerhouse effortlessly flushes out scale, lime, and dirt, ensuring your heater operates at maximum efficiency .

We love that it’s safe to handle and free of harmful volatile organic compounds, making it user-friendly .

By investing in this solution, you’re not just extending the lifespan of your heater; you’re also lowering energy costs in the long run .

Just remember to steer clear of aluminum surfaces !

It’s time to give your water heater the TLC it deserves!

Be sure to also check out the best transfer pump for water heater for more options! Also, here is the price history so you know exactly when to buy!

Price history for Qoddxx Descaler on Amazon

Clearflow Descaler

Tankless Water Heater Descaler - Premium Descaler for Tankless Water Heater Systems, Restores Heating Efficiency, Nontoxic, Biodegradable, Made in USA! (32 Ounce (Quart))
GoodNot So Good
Highly effective descalingAvoid aluminium surfaces
Biodegradable solutionRequires yearly usage
Restores water circulationLimited to tankless heaters

When it comes to the best water softener for your tankless water heater, we highly recommend this descaling solution from Clearflow Solutions .

Its highly effective formula works wonders in dissolving mineral deposits and maintaining optimal water circulation, which is crucial for the longevity of your heater .

With just one biodegradable liquid solution, you can tackle both organic and inorganic buildup—even more effectively than vinegar !

The easy-to-follow instructions ensure that anyone can use it without a hassle, while the larger gallon size provides four treatments, making it a budget-friendly choice .

Just remember to steer clear of aluminium surfaces, and you’ll be all set for efficient, flowing hot water!

Be sure to also check out the best spray paint for baseboard heaters for more options! Also, here is the price history so you know exactly when to buy!

Price history for Clearflow Descaler on Amazon

BriskSpring Descaler Water Softener for Tankless Water Heater

Salt Free Water Descaler, Water Heater Softener, Prevent Scale Buildup On Water Heaters, Faucet, Smart Toilet & Washer, Scale Inhibitor Inline System, 3-Year Durability, 1/2" Connector
GoodNot So Good
Effective scale preventionWeak installation instructions
Energy conservationPotential compatibility issues
Long-lasting performanceLimited immediate feedback

When it comes to finding the best water softener for your tankless water heater, we have no hesitation in pointing you towards this standout option .

With its physical anti-scaling features, it tackles limescale formation head-on, ensuring your water remains healthy and taste-free .

Plus, it’s all about energy conservation—protecting your appliances and extending their lifespan without the need for chemicals or salt .

The long-lasting effect means you can enjoy three years of maintenance-free performance, saving you both money and hassle .

While installation instructions could be clearer, the results are certainly worth it .

Say goodbye to scale and hello to efficiency!

Be sure to also check out the best weather stripping for tonneau cover for more options! Also, here is the price history so you know exactly when to buy!

Price history for BriskSpring Descaler on Amazon

iSpring ED2000

iSpring ED2000 Whole House Water Descaler, Alternative Electronic Salt-Free Hard Water Conditioner, Reduces Limescale Prevent Deposits Build-up, Different from a Water Softener
GoodNot So Good
Improves water qualityEffectiveness may diminish
Environmental friendlyLong-term results uncertain
Easy installationLimited to specific water hardness

When it comes to finding the best water softener for tankless water heaters, the iSpring ED2000 truly stands out .

We love how it tackles hard water problems without chemicals or salt, ensuring your water retains healthy minerals .

Its reliable descaler prevents scale buildup, reducing energy costs and benefiting both your home and the environment .

With easy installation—no plumbing modifications needed—it’s a dream for DIY enthusiasts .

While its effectiveness can vary based on specific hardness levels, the maintenance-free design and lifetime tech support provide peace of mind .

This is a great choice for anyone wanting cleaner water and healthier hair!

Be sure to also check out the best heat tape for plastic water pipes for more options! Also, here is the price history so you know exactly when to buy!

Price history for iSpring ED2000 on Amazon

Chromex Descaler

Chromex Tankless Water Heater Descaling Solution | Highly Effective Descaler Restores Heating Efficiency, Quart, 32 fl oz (1)
GoodNot So Good
Highly effective descalingNot for aluminum surfaces
Biodegradable solutionRequires regular maintenance
Easy to useLimited compatibility with some materials

When it comes to keeping your tankless water heater in top shape, Chromex's 32 fl oz descaling solution is a game changer !

We love how this powerful formula effectively dissolves inorganic mineral deposits, ensuring uninterrupted water flow and longevity for your unit .

Unlike vinegar, this biodegradable wonder tackles organic and inorganic buildup with ease .

The user-friendly instructions make the descaling process a breeze—just remember to avoid aluminum and magnesium surfaces !

With a solid rating of 4.7 stars and proven effectiveness, we highly recommend adding Chromex to your maintenance routine to keep your heater running smoothly for years to come.

Be sure to also check out the best carpet rake for matted carpet for more options! Also, here is the price history so you know exactly when to buy!

Price history for Chromex Descaler on Amazon

KleenWater KW2520SCALEX-3 Water Softener for Tankless Water Heater

Tankless Water Heater Filter, KleenWater KW2520SCALEX-3 Tankless Hot Water Filter System, Polyphosphate Filter for Scale Prevention
GoodNot So Good
Protects tankless systemsHousing can split
Easy installationCareful installation needed
Compatible with all brandsFilters may need replacement

When it comes to protecting your tankless water heater, the KleenWater transparent water filter is a game-changer .

We love its ease of installation and compatibility with top brands like Rinnai and Noritz .

This filter does an outstanding job of preventing scale buildup, ultimately saving you from those dreaded service calls .

However, we recommend careful installation, as the housing can sometimes split .

And remember, the filters will need replacement down the line .

Overall, for homeowners seeking reliable protection against water hardness, this product strikes a fantastic balance between functionality and convenience!

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Price history for KleenWater KW2520SCALEX-3 on Amazon

EcoSmart

EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology
GoodNot So Good
Endless hot water supplyHigh amperage draw
Compact and space-savingLimited flow rate
Highly energy efficientInitial installation cost

When it comes to choosing the best water softener for your tankless water heater, we find the EcoSmart ECO 11 stands out .

First off, who wouldn’t love endless on-demand hot water ?

Say goodbye to chilly showers !

With its remarkable energy efficiency, this unit heats water only when you need it, conserving both energy and space—it's 90% smaller than traditional heaters, making it a perfect fit for compact areas .

While the initial installation may require an investment and it has a higher amperage draw, the consistent performance keeps the hot water flowing expertly within a single degree of your desired temperature .

Trust us, your home will appreciate this gem!

Be sure to also check out the best lubricant for freezer drawers for more options! Also, here is the price history so you know exactly when to buy!

Price history for EcoSmart on Amazon

Waterdrop

Waterdrop Whole House Water Filter System, Reduce Iron & Manganese, with Carbon and Sediment Filters, 5-Stage Filtration, Reduce Iron, Lead, Chlorine, Odor, 2-Stage WD-WHF21-FG, 1" Inlet/Outlet
GoodNot So Good
Efficient 5-stage filtrationPotential for leaks
Long filter lifespanOpaque housing limits visibility
Easy DIY installationUnique fitting needs

When it comes to finding the best water softener for your tankless water heater, we’ve got our eyes set on the Waterdrop Whole House Water Filter System .

With its robust 5-stage filtration, this unit significantly reduces not just iron and manganese, but also pesky chlorine, ensuring your water tastes as fresh as a mountain stream .

The durable design means it can handle the everyday pressure we throw at it, while its DIY installation makes adding it to your home a breeze—no plumber needed !

Plus, with a filter lifespan of up to six months, you’ll not only enjoy cleaner water but also save on replacement costs .

Just remember, an opaque housing may limit visibility, so keep an eye on your connections to avoid leaks.

Be sure to also check out the best immersion water heater for bathtub for more options! Also, here is the price history so you know exactly when to buy!

Price history for Waterdrop on Amazon

Turbo Tank Cleaner Water Softener for Tankless Water Heater

Water Heater Cleaning Tool, Improves Hot Water Supply, Removes Hard Water Sediment, Flushes Gas & Electric Tanks, Pro-Grade DIY Solution
GoodNot So Good
Extends water heater lifespanNot for tankless heaters
Removes significant sedimentRequires additional cleanup
Quick installation processPotential drill strain

The Turbo Tank Cleaner is a game changer for anyone looking to enhance their water heater's performance .

With its durable design and clear housing, we can easily monitor the sediment removal process .

This tool promises multiple benefits—extending your heater's lifespan while improving efficiency and even lowering energy bills .

We appreciate how quick and easy it is to install, fitting right through the drain valve without draining the tank .

While it’s not suitable for tankless water heaters and does require a bit of cleanup afterward, its ability to break up stubborn sediment far outweighs these minor drawbacks .

It’s a must-have for efficient water heating!

Be sure to also check out the best under sink hot water recirculating pump for more options! Also, here is the price history so you know exactly when to buy!

Price history for Turbo Tank Cleaner on Amazon

Rheem RTEX-24

Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
GoodNot So Good
Energy efficientRequires 100 amps
On-demand hot waterInstallation issues reported
Compact designSome parts not as described

When it comes to the Rheem RTEX-24 Water Heater, we are genuinely impressed by its energy-efficient design and convenient on-demand hot water capabilities .

With an adjustable digital temperature display and a swift flow rate of up to 5.9 GPM, you’ll never be caught waiting for hot water again .

Its compact form fits neatly in various spaces, making it a fantastic option for any home .

However, be mindful that it requires 100 amps, which can lead to potential installation challenges .

Overall, this heater offers a reliable solution for anyone seeking continuous, hot water efficiently!

Be sure to also check out the best space heater to use with generator for more options! Also, here is the price history so you know exactly when to buy!

Price history for Rheem RTEX-24 on Amazon

Rheem Tankless Water Heater

Rheem 11kW 240V Tankless Electric Water Heater
GoodNot So Good
Energy efficient operationRequires significant power
Quick hot water deliveryLimited flow rate options
Adjustable temperature controlCustomer service issues reported

Rheem’s RTEX-11 water heater packs a punch in a compact design, measuring just 8.25”W x 12.63”H .

With its ON/OFF dial control and adjustable digital temperature display, we can easily customize our hot water experience .

This 11kW model delivers up to 2.68 GPM of consistent hot water, making it an efficient choice for those on-demand needs .

However, keep in mind it requires significant power and has limited flow rate options .

Despite some reported customer service hiccups, this unit’s energy efficiency and quick delivery make it a worthy contender for anyone looking to pair with their tankless water heater!

Be sure to also check out the best inline water filter for pressure washer for more options! Also, here is the price history so you know exactly when to buy!

Price history for Rheem Tankless Water Heater on Amazon

6699 Flushing Kit Water Softener for Tankless Water Heater

Tankless Water Heater Flushing Kit Includes 1/6HP Submersible Sump Pump with Two Adapters & 3 Gallons Pail with Bucket Lid Opener & Two 1/2” Dia X 6’ PVC Hoses with Washers
GoodNot So Good
Easy to useVinegar not included
All-in-one kitHoses may be short
Cost-effective solutionPump struggles to prime

When it comes to maintaining your tankless water heater, we absolutely love the Tankless Heater Clean Kit !

This all-in-one solution simplifies the process of keeping your system in peak condition .

With just a gallon of vinegar or biodegradable cleaner—both of which you probably already have—you can effectively flush and lengthen the lifespan of your heater .

While the included hoses may be a tad short and the pump can struggle to prime at times, the benefits far outweigh these minor inconveniences .

Plus, the bucket lid opener is a delightful touch that makes our task easier .

Overall, this kit proves to be a cost-effective and easy-to-use choice for any homeowner!

Be sure to also check out the best 2 post lift for home garage for more options! Also, here is the price history so you know exactly when to buy!

Price history for 6699 Flushing Kit on Amazon

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