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Tankless Water Heater

W hen a household isn’t supplied with hot water, a prompt and lasting solution is in demand. This is when a heater becomes mandatory and since it will imply a great long-term investment, the decision should be made after thorough research. A convenient option would be a tankless boiler. As its name suggests, it doesn’t include a storage tank, being more compact, and a better version for small spaces. Since it heats the water directly as it comes through the pipes and there is no reservoir to maintain hot, it represents a more cost-reducing alternative.

Whether it’s an electric model or a gas-powered one, it will be powerful enough to deliver water for either one faucet or the entire house.
Although the initial cost is greater, it will eventually limit your expenses by dropping the electrical or gas bill. You can learn more about their benefits and drawbacks, as well as other useful information from the following lines, so keep reading and find out if they are really worth the investment.

Top 12 Tankless Water Heaters Compared

Photo
Product
Power Source
Power
Temperature Range (°F)
Maximum Flow Rate (GPM)
Warranty
Price

Best Overall
Electric
27 kW
80-140
6
Lifetime warranty on parts

Best Commercial Tankless Water Heater
Electric
24 kW
86-140
6
7-year against leakage 3-year on parts

Best Gas Heater
Propane
28,000 BTUs
46.4-114.8
1.32
1-year

Our Choice
Electric
13 kW
86-140
4.8
5-year on heating chamber1-year on parts
Propabe
80.000 BTUs
80-140
4
2-year on parts
Propane
41,000 BTUs
60-160
1.58
1-year
Electric
6 kW
30-160
1.5
2-year
Electric
24 kW
90-135
4.6
2-year
Natural Gas
79,228 BTUs
33-100
3.1
5-year
Electric
12 kW
80-131
2.3
5-year on heating element1-year on parts

Best for Radiant Floor Heat
Natural Gas
11,000 – 190,000 BTUs
80-165
8
15-year on heat exchanger5-year on parts
Natural Gas
10,300 – 199,000 BTUs
98 – 140
9.8
12-year heat exchanger 5-year on parts5-year on parts 1-year warranty on labor

1. EcoSmart ECO 27

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Specifications:

  • Type: Indoor
  • Power Source: Electric
  • Power: 27 kW
  • Temperature Range: 80-140 F
  • Max Amperage: 112.5 amp.
  • Maximum Flow Rate: 6.0 GPM
  • Water Connections: 3/4″ NPT
  • Certifications: 1-UL Listed, CSA Listed, ETL Listed


This one is a very energy-saving model that gives you immediate hot water thanks to the electrical powering that uses 27 kW to increase the temperature. Since it’s so low-consuming, it won’t affect your electricity bill. The interior components are made of copper and steel to maximize efficiency and minimize upkeep. It was crafted using the innovative self-modulating technology so it calculates how much energy it will take to reach the established temperature so that it will capitalize every kW.

The overall size is very compact so it saves up to 12 cubic feet of storage space, compared to similar units. This doesn’t mean that it won’t yield as expected, on the contrary. It only takes 0.3 GPM of water to start and it will deliver an impressive stream of 8 gallons every minute, which is more than the majority of its competitors. Moreover, it covers 2 faucets and 1 shower without experiencing pressure fluctuations. The heat level is adjustable between 80 and 140F but the manufacturer suggests you keep it to a 110F level for most of your household chores.

All the important technical data will be shown on the generous digital screen. As for the warranty, the parts are warranted for life, while the labor isn’t covered by any warranty, which is somehow a drawback.

Pros

  • Lightweight and slim
  • Features a self-temperature setting
  • Impressive parts warranty
  • Widely-adjustable temperature

Cons

  • No labor warranty


Verdict

With a slim and lightweight design, it will yield great in medium or small size houses. Because it’s electric, it requires little maintenance, being at the same time a greener alternative. We also like the digital screen, the simple temperature adjustment, and the lifetime parts warranty.



2. Stiebel Eltron Tempra 24 Plus

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Specifications:

  • Type: Indoor
  • Power Source: Electric
  • Power: 24 kW
  • Temperature Range: 86-140 F
  • Max Amperage: 100 amp.
  • Maximum Flow Rate: 4.0 GPM
  • Water Connections: 3/4″ NPT
  • Certifications: 4-UL Listed, CSA Listed, ETL Listed


This boiler was crafted using industry-leading technology to provide an uninterrupted stream of boiling water. It is an electric type that uses 24 kW and it can bring the water between 86 and 140 degrees Fahrenheit. To make it more intuitive, the manufacturer put a drawing on the housing to exemplify the ideal level of warmth for the kitchen faucet, a shower, or appliances like the dishwasher.

We should also mention that it requires two 60-amp circuits, which is quite a lot of power, so check if the electrical system can safely handle the electrical requests. With a full stream reaching 5 gallons each minute, it is enough to cover 2 bathrooms and one kitchen, so it’s perfect for average-size homes. Moreover, it has a variable flow so you can use several faucets at the same time without facing a poor water stream.

Another great particularity is the self-setting control of the temperature that guides it in achieving the chosen temperature. As for peace of mind, the manufacturer comes to your assistance with a 7-year warranty against any possible leakage and a 3-year warranty on components, but it must be mounted by licensed personnel in order to be covered by the warranty.

Pros

  • Self-modulating temperature
  • Lightweight
  • Intuitive digital controller
  • Variable stream
  • High water stream

Cons

  • Additional wiring involved


Verdict

Conditional to the outside temperatures, you can benefit from its efficiency in 2 bathrooms and a kitchen, meaning it is powerful enough to cover a regular-size home. It is energy-saving and uses all the power to the fullest so it won’t increase your bills. Since it’s so small, it can fit nearly anywhere without additional plumbing and it is very simple to set and use, aspects that contribute to its popularity.



3. Camplux AY132

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Specifications:

  • Type: Indoor/Outdoor
  • Power Source: Propane
  • Power: 28,000 BTUs
  • Temperature Range: 46.4-114.8 F
  • Maximum Flow Rate: 1.32 GPM
  • Water Pressure Range: 3.0-110.0 PSI
  • Certifications: CSA Listed


This boiler is designed for both indoor and outdoor use, so it’s highly versatile, and it brings plenty of safety settings. It is perfect for camping, family trips, or mountain cabins since it measures only 20.28 inches long, 11.42 inches wide, and 4.33 in tall. It comes with a showerhead and a 5 feet hose so that the entire family can take outdoor showers during the summer.

What stands out about it is the low starting pressure, only 3 PSI. It heats the water very fast and delivers a satisfying stream – 1.32 GPM. It works with propane and the ignition is with batteries in case there’s no electricity. The 2D batteries are included and they last for long. To prevent any incidents, the heater is protected against overheating, anti-freezing, flame failure, dry combustion, high water pressure valve, and low water stream detection. It is very slim and has an incorporated handle that lets you transport it with ease.

Pros

  • Suitable for exterior and interior use
  • Slim shape with built-in handle
  • Minimal startup pressure– 3 PSI
  • The multiple safety features provide a safe operation
  • Provides instant boiling water

Cons

  • The showerhead with the hose is cheap quality
  • The valve may crack if left outside in freezing cold


Verdict

What we most liked about it is the ability to use it outside as well, so you can benefit from hot water at home or if you go on a camping trip. It is very simple to use by the entire family and very efficient at well.



4. Rheem RTEX-13

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Specifications:

  • Type: Indoor
  • Power Source: Electric
  • Power: 13 kW
  • Temperature Range: 86-140 F
  • Max Amperage: 54 amp.
  • Maximum Flow Rate: 4.8 GPM
  • Water Connections: 1/2″ NPT
  • Certifications: CSA Listed, ETL Listed


This model is the upgraded version of the Rheem RTE 13 and uses electrical power. It best suits household use and it perfectly fits small homes with 2 bathrooms or one bathroom and a kitchen. It is wall-mountable and you can only use it inside the house. Thanks to the slim shape, it will perfectly fit beneath cabinets or sinks. It is approximately 12 inches tall, 8.25 inches wide, and 3.62 inches deep and it weighs around 7 pounds.

It operates within a temperature choice of 80 and 140 F and a pressure between 25 and 150 PSI, delivering a maximum stream of 4.8 gallons each minute. It is NSF/ANSI certified for lead-free and is ETL and CSA listed. This unit lets you set the preferred temperature with 1-degree additions, so it will be incredibly accurate. You can read the settings on the large LCD screen.

Additionally, it features copper heating components. The mounting part is quite straightforward because it includes all the electric cables and adapters. It is 99.8% efficient, so it will help you limit the energy expenses. The heat exchanger is covered by the warranty for 5 years while the parts only for 1 year.

Pros

  • External temperature adjustment
  • The upkeep on the heating components is simple
  • Lead-free certified
  • The multiple safety features provide a safe operation
  • Provides instant boiling water

Cons

  • Not a good choice for large places
  • Not suitable for cold areas


Verdict

We chose it as one of the top options for small houses or apartments. It is less expensive than most units although not as powerful. The power usage is minimal while the flow rate is very impressive for a model of this size. Maintenance is also very simple, with easily-accessible components and a satisfying warranty. However, it’s not the most appropriate for cold areas.



5. Eccotemp FVI-12-LP

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Specifications:

  • Type: Indoor
  • Power Source: Propane
  • Power: 80,000 BTUs
  • Temperature Range: 80-140 F
  • Maximum Flow Rate: 4.0 GPM
  • Water Connections: 1/2″ NPT
  • Certifications: UL Listed


Chances are you will go for this unit once you learn that it will help you lower your energy usage by 50%, in comparison to a traditional boiler, so it will be of great support if you want to start a greener life. Take into consideration that it works on liquid propane so make sure you can supply it with a gas tank. Due to the sleek and slim design, it will easily fit anywhere, even underneath a sink. The maximum stream level per minute is 4.0 gallons while the heat can reach temperatures between 80 and 140F, making it strong enough to handle 1-2 bathrooms with multiple appliances, although it’s not the most powerful model out there.

Although this model doesn’t come with innovative features, you will surely be impressed by its popularity among many customers and the reasonable price that makes it among the first choices for those who want to receive good results at reasonable costs. However, one of its disadvantages is the fact that the warranty covers the components only for 2 years, which is less than all the other models reviewed. However, this shouldn’t worry you too much, because according to the general opinion, it is hard-wearing and unfailing, so it should provide great results.

Pros

  • Available in multiple colors
  • Separate controllers for gas and water
  • Accessible acquisition

Cons

  • Lower energy factor value
  • Short warranty


Verdict

This model works on liquid propane and is fit for 1 or 2 bathrooms. The unit is medium-sized and comes in two color options, white, and silver. It boasts an intuitive digital screen and independent controls for water, gas, and stream. Unfortunately, the 0.79 energy factor makes it less efficient than competitors and the short warranty is definitely a drawback.



6. Gasland BS158

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Specifications:

  • Type: Outdoor
  • Power Source: Propane
  • Power: 41,000 BTUs
  • Temperature Range: 60-160 F
  • Maximum Flow Rate: 1.58 GPM
  • Water Connections: 1/2″ NPT


With multiple safety features and a quick installation process, this is the optimal choice if you want to use it both indoors and outdoors. It’s slim and light and the top handle makes it easy to be carried and moved around. It is 17.3 inches tall, 11.8 inches wide and 6.1 inches long. It’s a propane-powered unit crafted with a forward-thinking combustion technology that will cut the expenses on gas.

The output resulted is 41,000 BTU per hour and it can offer around 1.58 gallons of boiling water every minute so it’s enough for regular use. A useful detail is that it only requires 2.5 PSI of water force to start, so it’s great for any source of water. You can also adjust the heat and stream according to your likings.
Since it’s an outdoor-compatible unit, it comes with a series of safety features that prevent any sort of incidents, and we mention the flame failure, the over-heat, the anti-freeze, and the dry combustion protection. It also self-regulates the heat and pressure so it will always work under the optimal parameters.

Pros

  • Multiple safety features for a risk-free operation
  • Needs only 2.5 PSI of pressure
  • Adaptable stream and heat
  • Small and lightweight
  • Simple installation

Cons

  • Poor instructions
  • The accessories are cheap quality


Verdict

We liked it because it can be used in medium houses or outdoors, and in extreme safety conditions. It’s very stress-free to set up and use and it is driven by propane, so no electrical connection is required. Also, it needs a low pressure to operate but it delivers a satisfying water stream.



7. Sio Green IR260 POU

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Specifications:

  • Type: Indoor
  • Power Source: Electric
  • Power: 6 kW
  • Temperature Range: 30-60 F
  • Max Amperage: 30 amp.
  • Maximum Flow Rate: 1.5 GPM
  • Water Connections: 1/2″ NPT


This model differentiates from the others as it doesn’t use a metallic heating tube. Instead, it is paired with a quartz infrared heating component that is highly resilient to erosion, calcium deposits, and scaling. In general, quartz heating tubes are known for their durability and fast thermal properties. As a result, it requires less maintenance and lasts for a longer timer. Also, since the heating part doesn’t come into contact with the water, there are fewer chances to develop bacteria or a metallic taste. It measures 13.5 x 8.5 x 3 inches, so it’s small enough to fit underneath most cabinets. At approximately 7 pounds, it is extremely lightweight.

It is intended with plenty of safety features like overheat thermal cut-off or high limit temperature safety cut off. Also, it includes a residual leakage current detection. The manual mode features 4 levels of power, from 1 to 4. The temperature is displayed on the LCD screen. This model also features a self-cleaning design for no-hassle maintenance. Additionally, you will benefit from a period of 2 years of warranty.

Pros

  • Quartz infrared heating element prevents rust, calcium deposits, and scaling
  • Light and slim design
  • Includes a thermostatic controller
  • Features a self-cleaning design for low maintenance
  • Multiple built-in protection features

Cons

  • No automatic restart in case there’s a power outage
  • Poor instruction guidebook


Verdict

Features an innovative quartz infrared heating element that requires little maintenance and lasts for up to 20 years. Also, the heating elements promote cleaner water. This unit comes with many features that increase its value and it’s pretty easy to mount although the included instructions are rather poor. A major flaw is the fact that in case the power gets off, it won’t restart automatically.



8. Atmor ThermoPro

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Specifications:

  • Type: Indoor
  • Power Source: Electric
  • Power: 24 kW
  • Temperature Range: 90-135 F
  • Max Amperage: 100 amp.
  • Maximum Flow Rate: 4.6 GPM
  • Water Connections: 0.75″ NPT
  • Certifications: ETL Listed


This is one of the smallest we have reviewed, so it’s ideal for limited mounting places. It is constructed of hard-wearing materials and it complies with the IP54 criteria so it can be safely fitted near water outlets. Additionally, it is lead-free. The design is simple, somehow futuristic, with a matte gray finish and a digital screen, with only one adjustment knob.

The 4.6 GPM capacity makes it great for 4 simultaneous applications. It is ideal for moderate to warm areas and is cheaper than most competitors. The simple design and setup make it among the most user-friendly models out here. Once you set it to the preferred temperature, there aren’t too many things to do. The digital switch increases the heat in 1-degree augmentations and it also features a self-modulating technology so it basically sets itself under the right parameters. It activates and shuts off automatically every time it notices water leaks or when it stops. There is little upkeep involved and the most important component, namely the heat exchanger, is accompanied by a 2-year warranty.

Pros

  • Self-modulating system
  • Packed with a safe overheat protection
  • Suitable for wall mounting
  • User-friendly digital panel
  • Rated IP54

Cons

  • You must get a separate pressure relief valve


Verdict

This is an ideal option at a smaller purchase price and it brings some of the essential features seen in more expensive competitors. We consider it a real bargain as it is simple to mount, includes a digital screen for intuitive handling, and operates at low energy charges. Just make sure you have a pressure relief valve, otherwise, it will not work.



9. Marey Power Gas

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Specifications:

  • Type: Indoor
  • Power Source: Natural Gas
  • Power: 79,228 BTUs
  • Temperature Range: 33-100 F
  • Maximum Flow Rate: 3.1 GPM
  • Water Connections: 1/2″ NPT


This practical tank-free boiler is very economical and efficient as it doesn’t need electricity to work. It’s highly versatile because it can be used with either natural gas or liquid propane, contingent to your residential supply. It is turned on by an electric pulse ignition that requires 2 D-cell batteries. It’s 100% rust proof so any water leaks due to damage to the reservoir are excluded.

The compact housing that measures 24′′ x 14′′ x 7′′ and weighs just 21 lbs. lets you install it even in small corners. The gas level and the heat can be selected with the variable knob. Plus, you can regulate its operation depending on the season so it will run more in winter and less in summer.
For increased safety, it has anti-combustion and gas pressure protection and it can function even when the pressure drops to 3.6 psi so you shouldn’t worry about these details. It releases 3.1 gallons of boiling water every minute and it is certified to operate perfectly at an 87% performance during its entire lifespan.

Pros

  • Separate controllers for the temperature and the gas usage
  • Lightweight
  • Electric pulse ignition start
  • Features an anti-combustion and pressure protection
  • Activates by water pressure

Cons

  • Installation seems a little heavy
  • Higher heat-up time


Verdict

This model is great for average-sized homes that are supplied either with natural gas or liquid propane. It’s so compressed that you can squeeze it anywhere. Despite the small size, it delivers a generous 3-gall stream per minute and it is among the most reasonably priced we reviewed.



10. Bosch Tronic 3000

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Specifications:

  • Type: Indoor
  • Power Source: Electric
  • Power: 12 kW
  • Temperature Range: 0-131 F
  • Max Amperage: 50 amp.
  • Maximum Flow Rate: 2.3 GPM
  • Water Connections: 1/2″ NPT
  • Certifications: 1-UL Listed, CSA Listed


With a thermal efficiency of 98% and a built-in thermostatic control, this heater is definitely worth considering. It is available in four sizes to meet your needs. The one we selected measures 12.75 x 6.5 x 3 inches and it weighs 5 pounds. This makes it ideal for tight spaces, but you can also install it in a visible place as it features a very simple design.
The heating components are made of high-grade copper that is guaranteed to provide superior heat conduction. If it rises the temperature with 45f, it will provide an output of 1.8 GPM while at 75F it has a 1.1 GPM output.

Furthermore, it’s very simple to adjust the heat to your liking due to the intuitive thermostatic controller. To support your purchase, the producer warrants the heating component for a period of 5 years and the other components for a period of 1 year.

Pros

  • Allows you to set the chosen temperature
  • The heat exchanger is made of cooper
  • Electric pulse ignition start
  • Doesn’t require a temperature or pressure release valve
  • Energy-efficient

Cons

  • Installation is quite cumbersome
  • Low water stream


Verdict

All in all, this model features a small footprint and it is very versatile– you can use it for a series of common applications. As for the price, it’s among the most reasonably priced options to go with. You might find it a bit difficult to install but reading the instructions carefully will get you out of trouble.



11. Takagi T-K4-IN-NG

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Specifications:

  • Type: Indoor
  • Power Source: Natural Gas
  • Power: 11,000 – 190,000 BTUs
  • Max Temperature: 165 F
  • Maximum Flow Rate: 8.0 GPM
  • Water Connections: 3/4″ NPT
  • Certifications: Energy Star


This unit is built to last and because it’s so small, it can effortlessly be mounted wherever you want inside the house. This particular model can deliver water for 2-3 baths and it ensures great power and stream for basically any activity, the full flow rate per minute being 8.00 gallons. Moreover, you can select a heat level between 98F-167F or you can use the preset temperatures. Another great thing is the fact that in case there’s a problem, it will announce you through a blinking red LED or through an error code on the screen of the remote.

It is packed with safety features such as freeze, overheat, or surge protection, so you won’t be bothered by any temperature oscillations while you shower. To help you enjoy it for a longer period of time, the manufacturer offers a very long warranty, namely 15 years on the heat exchanger, and 5 years on components for residential installation.

Pros

  • Can be converted to Direct-vent
  • Multiple safety features
  • Comes with a remote temperature controller
  • Features preset temperatures
  • Compact design

Cons

  • No warranty for labor


Verdict

All in all, this model features a small footprint and it is very versatile– you can use it for a series of common applications. As for the price, it’s among the most reasonably priced options to go with. You might find it a bit difficult to install but reading the instructions carefully will get you out of trouble.



12. Rinnai RL94iN

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Specifications:

  • Type: Indoor
  • Power Source: Natural Gas
  • Power: 10,300 – 199,000 BTUs
  • Temperature Range: 98 – 140 F
  • Maximum Flow Rate: 9.8 GPM
  • Water Connections: 1/2″ NPT


Although it costs more money than competitor models, RL94iN made by Rinnai is an exceptional investment over the years as it does what it promises: delivers boiling water to homes or business places. The impressive capacity of 9.4 GPM makes sit powerful enough to be installed on multiple plumbing appliances without its efficiency being affected. It is powered by natural gas, so there is no need to worry about it increasing your electrical bills – the 0.82 energy factor guarantees that it meets the energy-saving requirements established by the EPA.

It can produce a maximum amount of heat of up to 199000 BTU while at the lower setting it can produce 99000 BTU, which is enough for an unbroken stream of boiling water for up to 5 plumbing outlets. The heat level ranges from 98F – 140F but it can reach 185F if you buy an additional commercial controller. With the digital controller, you can set each plumbing appliance to a different temperature. Moreover, this state-of-the-art unit is compatible with Wi-Fi connections.
The housing comes in an elegant silver finish and is very slim, so it will be easy to mount nearly anywhere. Anyway, it is a little bit heavy but this is mainly because it is made of quality materials. This makes it very solid and durable. The setting buttons are placed at hand on the front, along with a small display that reveals the temperature.

The setup is pretty easy, but considering the fact that it requires attaching to a gas tank, it’s recommended that you hire an expert plumber. It uses a threaded connection type and it comprises all the valves and other necessary parts. The noise produced is similar to a bathroom exhaust fan, so it is relatively silent.

Pros

  • An impressive 9.4-gall water stream
  • Energy-saving
  • Equipped with digital control and digital monitoring and troubleshooting
  • Slim and easy to mount
  • Impressive power

Cons

  • High price


Verdict

Great for larger houses. It works on natural gas but it can be easily converted to propane. It has been built according to multiple certifications and it features an 0.82 energy factor. Even though is a little bit heavier, it manages to stay quite compact. Additionally, it comes with some helpful features and a long warranty.



What’s Behind Our Ratings


When we created the chart, we looked at a series of aspects that we believed to be essential in finding the heater that best yields. Here is how we rated each model :

  • Capacity: since every heater has a different capacity, it’s very important to know this aspect about every one of them. Normally, an average-size home should be fine with a model that can handle two water outlets, but bigger residences could need a more powerful unit that can provide boiling water for 3 bathrooms, let’s say. The products we selected are whole-house, destined for all household sizes.
    However, you should know that you can always link more tanks together if the model you want is not capable of handling more bathrooms.
  • Power source: in terms of alimentation, you have two options available, electric or gas that can be natural or liquid propane. Both are equally rendering, but there are some differences to mention: the electric ones come at a lower price and are cheaper to maintain over the years while being more environmentally-conscious. Gas ones are more expensive to buy and maintain, but the monthly costs are smaller.
  • Temperature range: this represents the limits between which you can set the boiler. Normally, for warm water, a 90-110F range will be more than enough, while for receiving boiling water you will need a 140-150F range in most cases.
  • Maximum stream rate: it represents the maximum amount of water heated within a minute, measured in gallons or GPM. To determine this, run simultaneously more fixtures you normally use and see how long it takes each fixture to fill a gallon container. In general, a showerhead, a dishwasher, and a clothes washer will need a stream rate between 3.5 and 7.5 GPM.
  • Energy factor: this depicts the energy efficiency of home appliances or equipment, such as heaters, clothes washers and dryers, or refrigerators. The higher the energy factor, the lower the consumption.
  • Additional specifications: they show you important particularities of every model presented in our evaluation chart. They are mostly features or other technical specifications that differentiate one product from another.
  • Warranty: this detail is highly significant because it lets you know for how long the manufacturer is willing to protect their product and which are the parts and defects they cover.



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Differences Between a Traditional and a Tankless Heater

Although they do the same thing, which is heating water, the entire process is slightly different in what regards the operating mode and the construction. Both types are commonly seen in households worldwide and each was selected for a good reason, based on the owner’s requirements and possibilities.

  • Traditional heaters: they can hold in a reservoir a certain amount of previously-heated water. Therefore, they will be using power continuously to prevent the water from getting cold and requiring to be heated again. This adds to the long term costs and even though this type is more inexpensive to purchase, the money loss will be noticed with time. The reservoir has a certain capacity and when it gets empty, it will take some time to refill, and you will run out of water in the meantime. Such a model can only be electric and it is high-consuming because of the large capacity.The setup part might be simpler but the lifespan is shorter. Also, you must have enough room to fit it because the housing is very large.
  • Tankless heaters: from the operating point of view, they tend to be more practical because there is no reservoir involved, just water heated instantly. The compact size makes it easy to fit even underneath the sink. Also, you are not at risk of dealing with an empty tank while you shower. Unlike the previous model, this one doesn’t rely on electricity solely, as you can opt for one powered by gas if it seems more convenient to you.The model is more durable, with a lifespan of over 20 years, and a simpler operating mode that prevents energy waste. Their main drawback is they cost more to purchase and install.

The Pluses of a Tankless Model…


When you need an appliance that will deliver hot water on demand, a tankless boiler scores some extra points from many perspectives. Buying this type brings a series of welfares like follows:

  • Eco-friendly: while reducing your once-a-month bills, you will also minimize the impact on nature. Since it only starts when needed, there is no power usage in the meantime, so no carbon footprint.
  • Convenient: a tankless boiler offers great convenience to its users because it can deliver a continuous stream for the entire family. Therefore, you won’t be forced to schedule your chores or bathing times because the appropriate model will successfully deliver great performance.
  • Durable: without question, the tank-free heater is more durable and less prone to damage. With an average 20-years lifespan compared to the tank model that has short 10-year durability, they represent a long-term investment. This is because they don’t corrode.
  • Fewer bacteria growth: since water is not stored in a container, the bacteria growth will be significantly reduced. Therefore, the chances to get an infection will be significantly reduced, so your entire family won’t be exposed to all sorts of health risks.
  • Safe: this type is a safe choice for many reasons, one of which being the fact that it only uses power when the water is turned on, so it doesn’t represent a fire hazard. At the same time, there is no tank to leak or cause a flood.
  • Space Saving: these models are slim and can be easily mounted wherever you want in the house. Therefore, having one of these and not a bulky tank will save space and it will also look much better from the aesthetic point of view.

…and the Minuses

Although they seem like heaven’s sent, it’s not all about advantages; they have their downsides as well. Before making a decision, it’s best to know both sides and decide only after a thorough analysis

  • Expensive: besides being money-saving and more convenient to use, they also require a large investment that is not always fit in the budget.
  • The electrical system might require an upgrade: not every home can handle tankless boilers because the electrical system might require an upgrade that can only be performed by a professional electrician. Rewiring your house can imply high costs which are added to the initial buying cost.

Buying Guide

As it happens with every item you buy, you want to make sure you will only receive positive results from it. Therefore, you will have to spare no time and effort while doing some research regarding the specs that differentiate the available models. In case you’ve decided to buy one and you want to discover which important aspects to consider, read the lines below and see what differentiates the best-value models.

  • See what size you need:this involves two aspects: the housing’s size and how mnay fixtures it can cover. The first one is simple to clarify because each model has the measurements labeled, so you can quickly determine which one you have room for. The second aspect is based on how many water outlets you have. Most models can cover around 3 faucets or two faucets and a shower.
  • Determine the flow rate you need: to determine this, you need to count the number of kitchens and bathrooms you have, the family members, and your schedule. Turn on every faucet and calculate how much time each one takes to fill a 1-gallon container, then divide 60 seconds by the actual number of seconds it took to fill it and that will be the flow rate of each fixture.
  • Decide on the fuel: this is usually among the first things to analyze before making the payment. The choices are either electric or gas, depending on your house’s supply. The gas and propane ones will offer you a higher stream and they are less expensive, while the electric models are more durable and more costly to purchase.
  • Measure the temperature rise: The arriving temperature usually relies on the outside temperatures that may vary from one area to another. So, turn on a cold water spout, wait several minutes, and then measure the temperature. If the temperature is, let’s say, 80F and you usually shower with water 105F hot, the difference is the rise you need to achieve from your boiler.
  • Choose a reliable brand: this is also very important because since there are numerous models available, you have to invest in a reliable brand. To do so, do some research on the company, the materials, and technology they use, the warranty they offer, how committed they are to helping their clients, and so on. A good brand usually receives good reviews from customers, so see what other buyers have to say about a specific model before deciding to buy it.

Top Brands On the Market


In the majority of the cases, a renowned brand is an insurance that the offered product is qualitative, useful, designed to last over the years, and will bring multiple benefits on many levels. If we speak about items that cost hundreds of dollars, a reputable producer is in demand as it reinforces the idea of a well-protected investment. Not only will the product come with a higher satisfaction degree, but it will also offer the certainty that your money is well spent. As such, here are the top manufacturing brands on the market.

  • Rinnai

    A reliable brand is a guarantee of remarkable products that offer great results and performance to all its users. Such is the case with the Rinnai company specialized in manufacturing and selling domestic and commercial tankless boilers and heating solutions all over the world. It has been committed to developing high-efficient products for almost 100 years and is present in 13 countries, being among the world’s top leaders in this industry.

  • Takagi

    Another trustful brand in this industry is Takagi and they are so popular for various reasons. First of all, the company is present in the niche since 1952 and its excellent products are proof of commitment and innovation. It offers energy-efficient tankless water heating systems, being constantly concerned about the protection of the environment. Although the main office is based in Canada, they have subsidiaries in California, New Jersey, and Tennessee, and the units are sold only by contractors and plumbing wholesalers.

  • Stiebel Eltron

    Many things can be said about the Stiebel Eltron company, but in some simple lines, we will tell you that it was established in 1924 and is now one of the biggest manufacturers in the renewable energy industry. The brand has gained more and more experience over the years and we can truly say that it’s among the most trustworthy when it comes to delivering high-quality products

  • Eccotemp Systems

    The Eccotem Systems company is relatively new, being founded in 2004, but ever since then, it was truly committed to manufacturing practical heaters at reasonable prices. The employees are always researching and developing state of art products destined for a wide range of people in need of hot water for their homes.


Frequently Asked Questions



?Where Should I Place the Heater
In the manual, you will learn that they need to be placed near the water pipe. Basically, you can mount the presented models wherever you want. Most users prefer to hide the unit, so they prefer the space under the kitchen basin, in a cabinet in the bathroom, in the basement, or any other hidden place. As long as you strictly follow all the instructions, you can put it anywhere.
?How do I Determine what Size I Need
This may seem difficult but in fact, it isn’t. In order to properly size it for your house, you simply have to pay attention to its specifications. Check the capacity and see how many water outlets it can handle. Some units are appropriate for 1 or 2 bathrooms while others can easily handle 5 bathrooms
?Is this Boiler Type Expensive?
The price depends on many aspects, including the fuel, capacity, brand, and so on. Some units can cost up to $1500 while others are much less expensive. However, the most expensive models usually include the most features or are designed for larger houses, so the price is justified.


Conclusion

Finding the most reliable and trustworthy model wasn’t an easy task, because the offer is generous and variate. However, we’ve managed to pull out 12 exceptional models that meet the highest standards of efficiency and safety. The choice is up to you now, based on the information we have provided.

Best Tankless Water Heater Overall: EcoSmart ECO 27 Electric

Houses located in low-temperature areas are best suited with this powerful model that can turn 37-degree cold water into 140-degree without overexerting the electricity bill. Designed to deliver 3 gallons every minute, it is suitable for households with multiple bathrooms and is packed with every feature you could possibly need. Moreover, the parts are covered by a life-long warranty, so you won’t have to deal with repair costs.

Editor’s Choice: Rheem RTEX-13

From every point of view, it turned out to be highly efficient and advantageous. Since it’s slim, it easily fits tight hard-reachable areas and it boasts a generous display that lets you see your selections. The stream and heat are reasonable and can be easily adjusted and you won’t have to break your budget to get it.

Best Tankless Water Heater for Radiant Floor Heat: Takagi T-K4-IN-NG

Homes with a floor heating system can be paired with this boiler powered with propane that is incredibly powerful, at 190,000 BTUs, being able to create a maximum heat level of 165F. Moreover, it provides a high flow level of 8 gallons so it can handle several water outlets.

Best Commercial Tankless Water Heater: Stiebel Eltron Tempra 24 Plus

This high-grade unit is designed to handle large homes or business places such as small motels or accommodation suppliers. It can deliver boiling water of 140F to high-demand bathrooms. The advanced flow adjustment ensures there will be enough water stream for multiple fixtures at a time. In addition, it’s energy-saving with a 0.99 energy factor.

Best Gas Tankless Water Heater: Camplux AY132

For times when you don’t rely on electricity or natural gas, this heater can deliver hot water instantly. Since it’s so small and portable, it can be taken on trips because it was crafted to resist low outdoor temperatures. Plus, you can install it indoors if you wish, as it comes with oxygen depletion sensor protection. Just make sure you place it in a well-ventilated area.