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11 Best Tankless Hot Water Heater of 2020

Shower cabin and water heater in a bathroom. Running water of shower faucet.

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Do you dread cold showers and hate winters just because of it? Then buying the ideal tankless hot water heater may be exactly what you need!

It will provide you with hot water at all hours of the day and reduce electricity bills to a great extent. Being slimmer than traditional versions that come with a tank, we could easily fit one into our bathroom space.

While tankless water heaters are becoming more popular by the day, there is a vast list of options to choose from, and that can be quite challenging. But don’t worry, we have got you covered.

To rescue you from a nerve-wracking expedition, this comprehensive and unbiased list of 11 exceptional options has been curated. Also, we have included a buyer’s guide that will help you choose the right one for your needs.

So, without further ado, let’s dive in!

Top Tankless Hot Water Heater

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IMAGE PRODUCT DETAILS
Our Top PickOur Top Pickhstcstbl-table__imageRheem RTEX 13 Electric Tankless Water Heater
  • Durable copper immersion
  • Adjustable digital thermostatic control
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hstcstbl-table__imageStiebel Eltron Tempra Plus 24 kW
  • Digital temperature control
  • Silent operation
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hstcstbl-table__imageEcosmart ECO 27 Tankless Water Heater
  • Digital temperature control
  • Made of copper and stainless steel
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hstcstbl-table__imageRinnai RUC98iN Ultra Series, Concentric/Twin Pipe Water Heater
  • Concentric or PVC venting option
  • Ultra-low NOx emissions
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hstcstbl-table__imageRheem RTGH-95DVLN Direct Vent Tankless Water Heater
  • Stainless-steel condensing heat exchanger
  • Low Nox emission
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hstcstbl-table__imageAtmor AT-D18TP-AZ Instant Tankless Water Heater
  • Digital temperature control
  • Smart flow technology
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hstcstbl-table__imageEccotemp FVI-12-LP Propane Tankless Water Heater
  • Gas-powered heater
  • Safe and efficient power ventilation
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hstcstbl-table__imageTakagi T-KJr2-IN-NG Indoor Tankless Natural Gas Water Heater
  • A maximum flow rate of 6.6 GPM
  • Includes a remote control
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hstcstbl-table__imageEcosmart ECO 18 Electric Tankless Water Heater
  • Digital temperature control
  • Advanced self-modulating technology
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hstcstbl-table__imageCamplux CA528 5.28 GPM Tankless Propane Water Heater
  • High thermal efficiency
  • Corrosion resistance technology
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hstcstbl-table__imageEccotemp L5 Portable Tankless Water Heater and Outdoor Shower
  • Runs on liquid propane fuel
  • Showerhead and garden hose adapter included
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Person in bathroom is adjusting the temperature in the water heater

  1. Rheem RTEX 13 Electric Tankless Water Heater

The product which tops the list for its brilliant heating capacities, along with a very affordable price, is the Rheem RTEX 13 Electric Tankless Water Heater. With self-modulating power control features, it truly stands out. Read on to know all about its bells and whistles.

Rheem 240V Heating Chamber RTEX-13 Residential Tankless...
  • External adjustable digital thermostatic control with LED...
  • Durable Copper immersion two heating elements, field...
  • Simple installation – 1/2 NPT adapters included; side 1/2...
  • 99.8% energy efficient. External controls to adjust...

Why Did We Like It?

We will begin with the most praiseworthy feature, which is the flow rate. The heater boasts of a flow rate of 4 gallons per minute, allowing it to supply hot water through a shower at a constant rate. You can even have running hot water through two taps continuously with no fluctuation in temperature.

Further, to help you read the temperature, an LED display is included, which is pretty wide and makes the temperature visible from a distance. Flaunting a high degree of accuracy, we were able to maintain the exact level of warmth we needed.

Long story short, it functions very efficiently, and is also known for its easy installation. We did not require professional help and were able to do the job ourselves. Mount it wherever it fits the best and follow the installation guide carefully for a foolproof experience.

What Could’ve Been Better?

While this product works very well for studio apartments and small families, it is not suited for larger families or houses. You will not be able to have two showers working at the same time. In case you are purchasing it for a large home, get more than one unit to provide for everybody.

Pros
  • Self-modulating power control
  • Installation is effortless
  • 99.8% energy efficient
  • Perfect for studio apartments
  • Affordable
Cons
  • Not for large households
  1. Stiebel Eltron Tempra Plus 24 kW

Next up is a product that has upped the ante with its unique self-modulating technology. The Stiebel Eltron Tempra Plus 24 kW will let you unwind after a long day at work without any sounds disrupting the silence. Enjoy a long hot bath every day while you save up on your electricity bill. Read on to know how!

Stiebel Eltron 224199 240V, 1 Phase, 50/60 Hz, 24 kW Tempra...
  • Digital temperature control. Voltage : 240 Volt or 208 Volt
  • Proven reliability
  • No venting required
  • Sleek design fits anywhere

Why Did We Like It?

The product is indeed known to be very energy efficient. With the capacity to control the water’s temperature, you can decrease up to 15-20% of your electricity bills. Since it is tankless, you will also be saving up on heating water unnecessarily, which would otherwise be stored in the tank.

While water is not stored, you will still be able to get a continuous flow of water at your desired temperature with advanced flow control. The shower stays warm, no matter how long you spend under it.

Adding to the benefits, you will love the silent operation. Loud sounds can be disturbing while you are in the shower and trying to relax. But with high-grade parts and a reliable cover, we found that there are no vibrations, leading to a lack of noise.

That’s not all! The gadget is also sleek and compact, and you can easily fit it into tight spaces.

What Could’ve Been Better?

While it functions perfectly well and comes with a three-year warranty, there is a small clause you should be careful about. The warranty will only be valid if you get one of the company’s personnel to install it. Consider this before going forward with the installation process.

Pros
  • Very sleek and can fit in all spaces
  • Energy efficient
  • No venting is needed
  • No temperature fluctuations
Cons
  • Warranty is only valid if installed by a licensed professional
  1. Ecosmart ECO 27 Tankless Water Heater

Ranking third in this list is the Ecosmart ECO 27 Tankless Water Heater, which is known to provide the best value for money. With a set of brilliant features, it comes at a very reasonable cost making it affordable for almost anybody.

Sale
EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240...
  • Savings of up to 50% on water heating costs. Dimensions :17H...
  • Digital temperature control in 1-degree increments allows...
  • Copper and stainless components designed for efficiency,...
  • Compact size saves valuable storage space, while the stylish...

Why Did We Like It?

We will have to begin with the feature that stands out and that is the flow rate. Even when outside temperatures are very low at around 37 degrees Fahrenheit, it can still produce warm water at 3 GPM. The moment temperature rises, the flow rate jumps to 6 GPM giving you greater efficiency.

A higher flow rate does not mean higher consumption of energy. It is equipped with a self-modulating system, making sure that the product uses energy only when needed. The supply gets shut off when you turn off the faucets and showers, reducing 50% of your electricity bills.

Also, it is made with stainless steel and copper, which are good conductors of heat. This will keep the heat rate constant and make sure it uses a limited amount of energy.

What Could’ve Been Better?

We felt that the company could improve when it comes to the interior parts and materials. Though copper works well in saving energy, it gets corroded easily, and we saw it happening after a year of usage. This made it less durable than other options on the list.

Pros
  • Sleek and saves storage space
  • Reduces 50% of the electricity bill
  • Parts can be easily replaced
  • Provides continuous hot water
Cons
  • Corrodes with time
  • cons
  1. Rinnai RUC98iN Ultra Series, Concentric/Twin Pipe Water Heater

Are you searching for a machine that functions on natural gas? Look no further as the Rinnai RUC98iN Ultra Series; Concentric/Twin Pipe Water Heater is one of the most energy-efficient choices in this list. We were delighted to have running hot water whenever required without wasting any amount of energy.

Rinnai RUC98iN Ultra Series Indoor Natural Gas Tankless...
  • INDOOR installation only. Fuel Type: NATURAL GAS.
  • Concentric or PVC venting option
  • Up to 0.96 Energy Factor/Up to 0.92 Uniform Energy Factor
  • The space-saving design allows Indoor Installation type

Why Did We Like It?

One of the common problems that most water heaters face is with the venting system. Rinnai has taken a stand against it by providing its device with a dual venting option. You can choose between concentric and twin pipes, depending on the ease of installation.

Another issue that it has attended to is the ability to provide hot water to larger households. This product will supply continuous hot water to multiple faucets and showers simultaneously.

If you are wondering about the flow rate, the unit can provide water at a rate of 9.8 GPM when powered by natural gas.

Overall, we found the gadget to be functioning smoothly while being energy efficient. It has a 0.95 efficiency rate, and you can rest assured that it is not pumping huge amounts of carbon into the air. This makes it environmentally-friendly, and you will not be adding on to the already high pollution levels.

What Could’ve Been Better?

We felt that although the product is known to feature a space-saving design, it is still heavy and bulky. This made it slightly difficult for us to install, but we did not have any further issues once it is in place. You could opt for professional help if needed.

Pros
  • Known for its space-saving design
  • Energy efficient with a rating of 0.95
  • High hot water flow rate
  • Can supply hot water to multiple taps
Cons
  • Very bulky
  1. Rheem RTGH-95DVLN Direct Vent Tankless Water Heater

If you are looking for a huge water flow to support multiple faucets at one time, the Rheem RTGH-95DVLN Direct Vent Tankless Water Heater will give you just that. With no temperature fluctuations, you will love the outstanding capacity of this product. Read on to know all about them.

Sale
Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless...
  • 94-Percent Energy efficient with stainless-steel condensing...
  • Intelligent electronic controls designed to increase energy...
  • Third party efficiency listed by AHRI
  • Up to 38-Feet of 3-Inch PVC Pipe or 5-Feet of 2-Inch PVC...

Why Did We Like It?

To begin with, this is a brilliant device to use at higher altitudes. Most products would fail to work in cold temperatures, but this works efficiently even as high as 9,800 feet and in 30 degrees Fahrenheit. So, if you do live in areas at a higher altitude, this will suit you well.

As for the energy output level, it is energy efficient and has a 94% energy rating. The heating stops as soon as you turn off the faucets and makes sure no amount of energy is wasted.

Adding to the benefits, the product has a self-diagnostic system making it very easy to install. You can do it without professional help. Just ensure that you pay attention to the instructions in the guide book.

Combined with low nitrogen oxide emission levels, it is also environmentally friendly. Overall, the brilliant attributes of this product gave us nothing to complain about.

What Could’ve Been Better?

With remarkable features comes a higher price tag. It is pretty expensive and may not be affordable for the ordinary householder. But if you are willing to spend a little extra, we would totally recommend this heater.

Pros
  • 94% energy efficient
  • Self-diagnostic system for easier installation
  • Digital remote control
  • Built-in electric blower
Cons
  • Very expensive
  1. Atmor AT-D18TP-AZ Instant Tankless Water Heater

Do you stay in a city with a freezing climate? The Atmor AT-D18TP-AZ Instant Tankless Water Heater will serve you exceptionally well with its capacity to maintain a water flow rate of 1.9 GPM even at 37F. You can engage in a warm shower whenever you wish to with this in the house.

18kW / 240V Electric Tankless Water Heater, 3.7 GPM, 75...
  • Digital temperature control allows you to set your...
  • Electricial requirements: 3 x 30a single-phase DP breakers,...
  • Specially equipped to heat incoming water as low as 37F at...
  • Stainless steel interior is durable and corrosion resistant...

Why Did We Like It?

We will begin with the incredible qualities of the water sensor. While many devices that are far more expensive do not have this attribute, the sensor ensures that every time you turn off the tap, the heat is turned off simultaneously. This brings down the electricity bills to a great extent. We saw a 50% fall in our bills after shifting to this excellent option.

Adding to this, the unit is known to be very user-friendly. Equipped with only the essential features, it has just one knob below its digital thermostat to control the temperature. Kids can also operate it easily and change the temperature when required.

Besides this, it is known for its durability. The gadget has a stainless steel interior that is not prone to rust or corrosion, and hence, ensures that it lasts long. With a low price tag and a host of such attributes, this is an excellent deal to make.

What Could’ve Been Better?

While this product works well with one shower or a faucet, it will not work for more than one shower at one time. This may be perfect for you if you live alone, but otherwise, it could be a source of hindrance. So, make sure that you consider this before purchasing one.

Pros
  • Requires no venting
  • Corrosion-resistant interiors
  • Energy efficient
  • Advanced self-modulating system
  • Can provide water flow as 37F at 1.9 GPM
Cons
  • Cannot provide water for two showers at once
  1. Eccotemp FVI-12-LP Propane Tankless Water Heater

In the seventh position, we have the smallest product of all! The Eccotemp FVI-12-LP Propane Tankless Water Heater weighs only 20 lbs and stands out as one of the lightest options on this list. It can fit into the tightest of space, thanks to its sleek built.

Eccotemp FVI12-LP Liquid Propane Gas Tankless Water Heaters,...
  • Whole home indoor, gas powered tankless water heater, rated...
  • For indoor installation with safe, efficient power...
  • Easy to read digital temperature display, on a compact and...
  • Safe electronic ignition system; plugs into standard 120v...

Why Did We Like It?

First of all, we will mention the internal sensors which are very efficient in detecting cold water rushing into the pipes. Live burners heat the water immediately, and you will get a flow rate of 4.8 GPM.

We found that the product could easily provide for two bathrooms with multiple demands. You can also use it for your dishwasher and laundry along with a shower simultaneously.

We should tell you that constant usage would not lead to the consumption of excess energy. You will be saving up to 50% of your bills because of its high level of energy efficiency.

Along with this, a digital control panel is placed on the body of the heater to provide for a clear display. This helps in adjusting the temperature with separate knobs to control the water and gas.

Overall, we found this to be an incredible propane and natural gas heater with a price that did not burn a hole in our pockets.

What Could’ve Been Better?

Although it is compact and will not take up space, it cannot be installed indoors or in confined spaces. The vents have to be ported outside to ensure the safe functioning of this device. This may be an issue for those who live in an area facing extreme weather conditions throughout the year.

Pros
  • Minimal noise output
  • Safe electronic ignition system
  • Flaunts a space-saving design
  • For smaller houses and cabins
Cons
  • Cannot be installed indoors
  1. Takagi T-H3-DV-N Indoor Tankless Water Heater

Are you looking for a budget-friendly water heater? Made with high-quality materials, the Takagi T-H3-DV-N Water Heater makes for a great choice. It is specially designed for smaller homes and can run up to two faucets at once. What’s more? It will fit into any tiny space that you can spare.

Takagi T-H3-DV-N Condensing High Efficiency Natural Gas...
  • Endless hot water, On-demand usage, Compact, Space saving,...
  • Computerized safety features, No pilot light to have to...
  • Safety features include freeze, overheat, surge protection,...
  • Satisfies the 2012 SCAQMD Rule 1146.2 for Ultra-Low NOx...

Why Did We Like It?

One of the greatest advantages is that this product does not depend on electricity to run. It completely functions on natural gas and has a flow rate of 6.6 GPM. You can adjust the flow easily and set it according to your preference.

In addition to this, the remote control will help you operate the heater and set your desired temperature. There are advanced switches (DIP) provided for greater efficiency while trying to control the heat level.

And guess what! You can get hot water equally fast at higher altitudes when the temperature is very cold. With freeze protection technology, it is absolutely protected when exposed to lower temperatures.

Along with this, the gadget comes with surge protection. This prevents sudden electrical spikes from causing any damage.

Lastly, if you face any kind of inconsistency with the product, there are diagnostic codes that will help in troubleshooting.

What Could’ve Been Better?

The only issue is with the warranty. It has a ten-year warranty, but you can only claim this if you get a Takagi professional to install it. If you plan to install the device yourself, the warranty becomes invalid. So, be careful about this and get a professional’s help to keep it valid.

Pros
  • Perfect for small residences
  • Small and light
  • Protected from freezing and overheating
  • Powered by gas
Cons
  • Warranty is invalid if not installed by Takagi professional
  1. Ecosmart ECO 18 Electric Tankless Water Heater

Next up is the perfect mid-range heater sporting a set of the most advanced features. The Ecosmart ECO 18 Electric Tankless Water Heater will ensure you do not have to deal with freezing cold water ever again. Paired with a compact and durable body, it is a great option indeed.

Sale
Ecosmart ECO 18 Electric Tankless Water Heater, 18 KW at 240...
  • The product is highly durable
  • The product is easy to use
  • Manufactured in China
  • Copper and stainless components

Why Did We Like It?

First of all, this is the perfect choice for mid-sized houses. The gadget is capable of heating two sinks and two showers simultaneously. Hence, if you have two washrooms, both will be taken care of.

To easily adjust the temperature, it has digital temperature control like many of its peers. This allows one to set the temperature and shift between 80F and 140F.

Coming to the body, it is very compact and sleek. You will be able to mount it up on a wall and save storage space. This is a crucial consideration for those living in small houses.

Lastly, it has a very advanced self-modulating technology, which only uses energy when needed. We were able to bring down the electricity bills to a huge extent after shifting to this from the traditional heaters with a tank.

What Could’ve Been Better?

Since a large part of the inner elements are made of copper, they are prone to corrosion. This can be detrimental to the product, but we have a solution. Take out the inner elements and soak it in vinegar water every six months to remove mineral buildup. This will help you prevent any kind of corrosion.

Pros
  • Sleek wall-mounted design
  • Elements can be easily replaced
  • Easy to install
  • Limited lifetime warranty
Cons
  • Copper elements corrode easily
  1. Camplux CA528 5.28 GPM Tankless Propane Water Heater

If you want an endless supply of hot water for your household, the Camplux CA528 5.28 GPM Tankless Propane Water Heater will be the perfect choice. With intelligent controls and adjustment features, you will know you are in safe hands.

Camplux CA528 5.28 GPM Indoor Tankless Propane Water Heater
  • 【Enjoy & Comfortable Constant Hot Water】This residential...
  • 【Advanced Safety Features】 CSA certified balanced...
  • 【Smart& Energy Saving】PCB frequency conversion...
  • 【High Thermal Efficiency & High-Rise Wind...

Why Did We Like It?

This product has a unique feature that sets it apart. With high-rise wind resistance, it can resist up to grade 8 wind speed and 240Pa high anti-wind pressure.

Also, it has a wind pressure sensor which will detect high wind force and adjust the flame and fan accordingly. So, the combustion is not affected regardless of the weather conditions outside.

This makes it a great choice to be used at higher altitudes or in top floors of high-rise buildings.

Besides this, the heater has a safe electronic ignition system with anti-freezing protection too. Hence, we can say it is absolutely protected from all external calamities and has got a CSA certification for it.

To top it all, the gadget is energy-efficient and has a 92% thermal efficiency rate. The temperature will be adjusted according to the external temperature, and you will get hot water at all times.

What Could’ve Been Better?

Although we have no issues with the functioning, it took us days to finally mount this heater because the exhaust piping was not included. So, we had to order it separately and wait till it arrived. This also raised the total expenditure making it slightly expensive.

Pros
  • Features high-rise wind resistance
  • Great customer service
  • Safe electronic ignition system
  • CSA certified balanced combustion design
Cons
  • Exhaust piping is not included
  1. Eccotemp L5 Portable Tankless Water Heater and Outdoor Shower

Imagine getting hot water while you are out camping in a forest or by a lake. With the Eccotemp L5 Portable Tankless Water Heater, this is possible. Take a warm shower after a dip in the pool, thanks to the hand shower that comes along with this heater. You could also use it for bathing your farm animals.

Sale
Eccotemp L5 Portable Outdoor Tankless Water Heater
  • Being Designed and developed in Summerville SC USA, The...
  • Lightweight, easy to carry, and compact, makes using it for...
  • Runs on a standard 20 lb. liquid propane tank and is...
  • Real, appointment based dedicated support available M-F,...

Why Did We Like It?

This is the best portable tankless water heater that you will get. All you require is a water source and a propane tank, and you will enjoy the luxury of warm water anywhere. You can also use 2 ‘D’ cell batteries to run the electric ignition wherever electric supply is not available. We loved the convenience that is offered.

Adding to the benefits, this product has a safety shut-off feature that will shut off the engine if it runs for 20 minutes at a stretch. It will stop functioning even if you tip it more than 45 degrees in any direction. This is very beneficial, especially while using outdoors on uneven ground.

Further, to make it easier to take around, the product is very light and compact. It will not take up too much space and can easily be carried in any vehicle.

What Could’ve Been Better?

The only drawback here is that it does not function at higher altitudes. We tried using it at 6000 feet, and it did not function at all while it works perfectly well at lower altitudes. So, take this into consideration before making a choice.

Pros
  • Simple temperature controls
  • Compact and easy to carry
  • Low-pressure activation of 20 PSI
  • A flow rate of 1.5 GPM
Cons
  • Does not work in higher altitudes

Boiler water heater with plastic tubes on green empty wall background. Home bathroom appliance for comfort life. Modern household central heating system equipment Realistic 3d vector illustration

Tankless Water Heater Buyer’s Guide

By now, you must have gone through our best picks and realized that it is indeed difficult to decide on one. There are multiple factors at play, and one has to evaluate based on flow rate, energy efficiency, and other features that may be essential.

To help you make a choice, we have detailed down the critical points that need to be kept in mind. We hope this guides you towards buying the one that fits the best.

Flow Rate

How much water is needed by you at once? This is a crucial question that needs to be answered before choosing a heater. If you stay alone in a small flat or a cabin, a 2.5 GPM should be enough. It provides water for one shower at a time and maybe a small faucet. This is a cheaper option to pick considering you will not need to operate multiple faucets at once.

On the other hand, if you want to run two showers or multiple faucets, you will need a flow rate of at least 5 GPM. This would mean choosing a more powerful and expensive water heater.

Energy Efficiency

While heating water already consumes a lot of energy, you must choose a product that has a self-regulating system. Such a system will switch off the heat as soon as you turn the faucet or shower off, and this, in turn, will save you from wasting any amount of this resource.

Placement and Size

If you have a small house or cabin, make sure that you choose a sleek and compact product. This will ensure that it can fit in tight spaces too.

Now, coming to the placement, check if it can be placed indoors. Some gadgets cannot be placed inside the house and will need to have their venting outlets placed outside.

In such cases, if you have adverse weather conditions, the body may face damage and you will need to opt for one that can be kept indoors.

a modern turbofan boiler with the 3D rendering

Verdict

Gone are the days when you would have to take a bath in cold water because a traditional water heater with a tank would be too space-consuming to keep. With tankless options, you can fit in your water heater into the tight spaces with ease.

With this, we come to the end of our comprehensive guide of the best tankless hot water heaters of 2020. We sincerely hope that you found the perfect choice. But in case you are still in a dilemma, we can guide you a bit more before signing off.

So, allow us to tell you our favorites. The Rheem RTEX 13 Tankless Water Heater is the best overall because of its brilliant set of attributes and self-regulating system.

Our most valued pick would be the Ecosmart ECO 27 Tankless Water Heater. And the one which makes the least amount of noise has to be the Stiebel Eltron Tempra Plus.

With this, we will take our leave. Happy shopping!

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