Best Tankless Water Heater Reviews 2018 and Comprehensive Buying Guide

best tankless water heater reviews 2017
best tankless water heater reviews 2017

Tankless water heaters are compact, and easy to install.

If you’re in the market something to heat your water —whether you’re looking to upgrade your storage tank heater or simply in need of a new water heater for your home—then you’ve come to the right place.

Tankless water heaters both save on space and create a source of convenient hot water without significant installation disruption and cost.

But, buying a one of these units may well seem a daunting task. To help you our, we’ve saved you the hassle of browsing through hundreds of options by compiling this list of some of the most useful storage tank free units on the market today.

Whether you need an electric device, or one powered with natural gas, we have looked at the models on the market today and compiled a list of what we believe are the best models available.​

Our Top 10 Heater Comparison Table

In order to help you narrow down the options when purchasing a heater we provide below a table showing our pick of the top 10 water-heaters which do not require a tank together with a link to the relevant review. 

We recommend you spend some time looking at the table and checking out the reviews, we are confident you will find a model that suits your needs.​


Heater Name




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Stiebel Eltron Tempra 24 Plus Electric Tankless Whole House Water Heater

Best Whole House Tankless Water Heater



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Takagi T-KJr2-IN-NG Indoor Tankless Heater



electric water heaters with no tank

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Bosch T 2.7-Gallon Electric Mini-Tank Under Sink Water Heating Unit



best water heater requiring no tank

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EcoSmart ECO 27 Electric Heater



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EcoSmart ECO 11 Electric Water Heater



tankless gas water heaters

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Ecosmart ECO 18 Electric Water-Heater



tankless electric water heater reviews

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Rinnai RUC98iN Ultra Series Natural Gas Tankless Heater



rheem heater reviews

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Eccotemp L5 Portable Heater and Outdoor Shower



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Rheem RTEX-08 240V Heating Chamber Residential Water-Heater



best chamberless hot water heater

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Rheem RTEX-13 240V Heating Chamber Residential Water Heater - No Tank



No Tank Water Heater Reviews

Stiebel Eltron Tempra 24 Plus Electric Tankless Whole House Water Heater

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  • Designed with Advanced Flow Technology which ensures consistency in temperature output.
  • Energy efficient.
  • Requires no to little maintenance.
  • Very easy to install.
  • Designed with digital temperature control
  • A bit expensive.
  • May not work well in cold temperatures.

Lauded as one of the most technologically advanced tank less appliance, the Stiebel Eltron Tempra is a German made electric whole on demand heater. It is a redesigned model from the Tempra series that comes with upgraded single flow sensors, easily accessible hinged cover and heavy duty electronics.

Product Features

The electric powered model has many advantages over other similar models. For instance, it is easier to install and cheaper than its gas counterparts. However for it to function optimally, the heater requires 2.60 amp circuits and a 208/240 volts power.

With these prerequisites in place, you can enjoy an endless supply of clean and warm water with the Tempra 24. Customer who have this installed all note it saves between 20-30% on their bills. They also note that Stiebel customer service is first class and very helpful.  As a warning, it is worth noting that the machines only allows users to run 2 hot water fixtures simultaneously.

It has a flow rate of 4 gallons/minute which means using two hot showers at the same time may be pushing it too far. Also depending on the initial temperature of the water, the heater can warm water up to 120 degrees F.

Bottom Line

The Tempra 24 plus will serve any low usage requirements very well. It is an ideal option if you are looking for an on demand heater that maintains the water temperature at the specified flow rates.

Takagi T-KJr2-IN-NG Indoor Tankless Natural Gas Water Heating Unit Review

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  • Equipped with Water and Exhaust Temperature control and AFR (Air Fuel Ratio Sensor) for optimal performance.
  • Can deliver up to 6.6 gallons per minute.
  • Requires maintenance only once in a year.
  • Works well even in cold climates
  • Requires a venting system

Takagi is a reputable firm known for its feature rich and sleek design products. The Takagi T-KJr2-IN-NG Indoor Tankless Heater does not defy this tradition either. It is one of the most compact water heating model in their range. It is also a bit larger than most electric heaters.

Product Features

The indoor natural gas heater can comfortably meet the needs of an average home with up to three bathrooms. The appliance delivers up to 6.6 gallons per minute and it is designed with both outlet and inlet thermostats for constant heat monitoring.

It is also more energy efficient than traditional tank style heaters and uses gas only when there demand for hot water. What’s more is that it is architected with an energy saving factor of 81 to 83 percent.


Although the Takagi T-KJr2-IN-NG requires special venting and is a bit expensive, it is a cost effective option in the long term. The unit is ideal for small to average sized families and works well in both chilly and mild weather conditions. It also comes with a 5 year warranty on the parts and a 10 year limited warranty on its heat exchanger.

Bosch T 2.7-Gallon Electric Mini-Tank Under Sink Water Heater Review

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  • Clean and safe.
  • Long lifespan.
  • Eco-friendly.
  • Consistent.
  • Eco-friendly.
  • High upfront cost.

Bosch is another good example of high quality German Engineering. It is the leading manufacturer of home appliances in central Europe and one of the largest firms in the industry globally. The company has been in the game for a while now and they have perfected the art of manufacturing genuine high quality home appliances. And the Bosch T.27 Gallon Electric Mini Tank Under Sink Heater is no exception.

Product Features

The Bosch T.27 is a powerful yet compact electric mini-tank heater with over 95 percent efficiency.It has a modulating control and flow sensor unit that ensures constant temperature output and counters unpleasant temperature fluctuations.

Nonetheless one main concern with the machine is that it is a bit lacking in terms of gallons produced per minute. While many electric models deliver up to 9 gallons per minute,the Bosch 7.27 can only deliver 2.7 gallons per minute.

Wrap Up

While there are many good heaters on the market, none can beat or even come close to the Bosch 2.7. It also has a very fast recovery rate that eliminates long waits for hot water and many other handy features that other similar appliances cannot match. It can also provide a constant and endless stream of water whenever you need it.

EcoSmart ECO 27 Electric Heater Review

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  • Lifetime warranty.
  • Reliable customer support.
  • Great energy savings.
  • Digital Temperature control
  • Some owners say it the temperature is not consistent

This appliance from EcoSmart is one of the most reliable tank-less water heating system in the world. And although it only works well with propane systems, it can help a user save up to 65 percent on heating bills. The unit also comes with a limited lifetime warranty for a buyer who uses it in a residential setting.

Product Features

You will need a double pole breaker (60 amps), AWG wire and an electrical panel of 125 amps to install this unit. This typically means that the heater will work optimally but will not overheat your electrical connections. In addition, one big problem that many consumers experience with many tank less heaters is lack of a tank which limits the amount of water they can use. But this one was designed to provide you with as much water as you need every time.

Bottom Line

One of this machine’s main advantage is that it is manufactured by a transparent firm that is known for disclosing everything about their products. Many consumers appreciate this because they precisely know what they are buying. In addition Ecosmart provides reliable and proven technology in a sleek and an appealing package with this unit. Performance wise this heater also comes second to none!

EcoSmart ECO 11 Electric Water Heater Review

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  • Easy to install.
  • Designed with self-modulating technology which helps in conserving energy.
  • Comes with a lifetime warranty on parts.
  • Compact and small in size
  • High demand for power both when running and at installation

The Ecosmart 27 electric tank less heater is one of Ecosmart’s most powerful appliances. It is very reliable and it is architected to handle all types of hot water demands even in cold climates. It is an excellent option for both large and small households in moderate and cold spots respectively.

Product Features

One outstanding feature about this machine is that it excels even in the coldest climates.

It delivers 3 gallons per minute even at 37 degree inlet temps which is the coldest you can get without your pipes freezing. It is also very useful in warmer settings.

It can provide up to 6 gallons per minutes which is more than enough to run 2 showers simultaneously in low flow fixtures.


With the ability to run even in cold temperatures and a pocket friendly price tag, the ECO 27 is a great option for small to midsized families. It is also a good option if you want a machine with more power and flow than other similar appliances without spending a significant amount more.

EcoSmart ECO 18KW Electric Electric Water-Heater Review

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  • Solidly built.
  • Energy-saver.
  • Compact, space-saving design
  • Costly installation.
  • Parts are difficult to find.

Capable of supporting up to two showers with water running at no more than 1.5 gallons per minute, the 18KW EcoSmart ECO Tankless Water Heater is a more than decent option for small to medium-sized homes. With an optimum water temperature of 62 degrees Fahrenheit, you can expect about 2.5 gallons of heated water per minute.

Product Features

The control panel is pretty straightforward: a digital temperature control knob that lets you change the temperature settings in 1-degree increments. As for electrical requirements, you will need to have at least a 150-ampere electrical panel and two 40 amp breakers before you install the heater.

Aesthetically, the design is modern yet simple and quite attractive. Its compact build is an absolute space-saver too.

One particular downside to this unit is that installation by licensed professionals costs almost as much as the unit. Furthermore, its parts are surprisingly hard to source so keeping it in tip-top shape might leave you a little worse for wear.


Overall, the EcoSmart ECO version is a solid unit for small to medium households. In terms of energy efficiency, the heater practically pays for itself after a few years. For people using hard water, a scale inhibitor will be necessary if you want to keep the unit from breaking down before its time.

Rinnai RUC98iN Ultra Series Concentric Natural Gas Water Heater Review

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  • Energy efficient.
  • Nice, compact size.
  • Precise temperature controls.
  • Great customer service.
  • Results in a slight drop in water pressure.
  • Takes a bit longer to heat water.

Although heating your water is considerably more energy efficient without a tank than with, nitrogen oxide emissions are usually a great concern for most households. This is not something to worry about with the Rinnai RUC98iN heater, however, as it produces ultra-low nitrogen oxide emissions. This sleekly designed model is small and easy to install; perfect for small and medium households.

Product Features

On the score of energy efficiency, this unit is rated 95% thermally efficient. It can run two showers at the same time, although with a notable drop in water temperature.

Nevertheless, it's pretty consistent and can produce fairly hot water even at cool temperatures.

Worth mentioning also is that the unit is superbly quiet; no humming or annoying buzzing sounds are emitted when it is working. If you’re looking to buy this unit for commercial purposes, you will have to fork out a few extra dollars for a commercial temperature range controller. Otherwise, it is quite a good deal for residential buildings.

Installation is not as straightforward as it should be although it should take about a day if done right. It can heat your water to a maximum temperature of 140 degrees Fahrenheit, which is more than adequate for most.

Eccotemp L5 Portable Heater and Outdoor Shower Review

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  • Easy and simple setup.
  • Lightweight and highly portable.
  • Comes with all the necessary adapters.
  • Will not work in a steamy environment.
  • Plastic shower hose is leaky.

Killing two birds with one stone is much easier with the Eccotemp L5 water-heater and portable shower. Not only do you get an endless supply of hot water in your home, you also get to take it with you wherever you go. At home, your heater can be powered by a propane tank while two D-cell batteries allow you to enjoy hot showers on the go.

Product Features

Its top feature is its compact, 13-pound body which is as easy to install as it is to carry around. This unit operates at pressures between 20 and 80 PSI and is compatible with modifications such as the 12-volt pump.

Its detachable nozzle comes with different spray settings and can emit water at a flow rate of 1.4 gallons per minute. The heater itself can heat water to temperatures of up to 80 degrees Fahrenheit.

It comes with an automatic shut-off feature that is activated after 20 minutes of dormancy. All the required fittings and adapters are included in the purchase.

A couple of downsides include the fact that the heater shuts down completely in a steamy room so it is best not to use it in confined spaces. Also, if you mind the smell of propane gas while you shower, this may not be the best option for you.

Rheem RTEX-08 240V Heating Chamber Residential Water Heater Review

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  • Easy-to-use temperature control panel.
  • Compact design.
  • Highly efficient.
  • Installation might be tricky.

The Rheem RTEX-06 is a solid tankless water heater with a compactly designed body that can fit virtually anywhere. One of the things to love about this particular heater is its easy installation, which only requires about 3 feet of standard electric cabling and a few adapters and connectors.

Product Features

This model has been rated with 99.8% energy efficiency. It utilizes two field-serviceable copper immersions to heat water quite fast. It works well in cooler areas and maintains the water pressure as well.

You will have to minimize your usage to two running showers at once, or one shower and one faucet. It comes with a temperature control panel that features thermostatic control with an LED display panel that lets you adjust the temperature in 1 degree increments.

The display also displays the current temperature of the water.

Wrapping Up

There is not a lot that’s wrong with the Rheem RTEX-06, except the slightly difficult installation process. Otherwise, you should buy this heater if it is your first time shopping for a tankless one since it is quite user-friendly.

Rheem RTEX-13 240V Heating Chamber Residential Water Heater - No Tank Review

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  • Solidly built.
  • Larger water heating capacity.
  • Energy efficient.
  • Cumbersome installation

The RTEX-13 is a bigger version of the previous heater. Perks of owning it include the ability to run more than two showers at once at a comfortable water pressure. However, the energy consumption will be a bit higher than you may find reasonable.

Product Features

A digital thermostatic control lets you adjust the temperature easily by 1 degree increments with impressive accuracy.

An LED display lets you view the current temperature of the water and to make adjustments easily.

The unit is 99.8% energy efficient and installs pretty easily using a few electric cables and the necessary connectors.

To Conclude

The only value this model adds is size, which translates to running multiple water sources at the same time without having to compromise on water pressure or temperature. Quick heat-up times ensure you don’t have to wait for long to enjoy a hot shower.

Tank-Free Water Heater Buying Guide

What is Different About these Heaters

We are all use to seeing the big round white tank in the basement or hideaway closet used to heat and store water for whenever we need it. They are part of the panoply of mechanical devices that make modern living tolerable. Without a hot water tank, we’d be boiling water over a stove to take a hot bath. The alternative is of course a cold shower.

The "hot water" heater was invented in a time when energy was abundant and cheap. Finding ways to reduce the impact of this limited resource was the inspiration for discovering the process used today in tankless versions. Instead of keeping 40, 50 or even 100 gallons of water at a temperature of 125˚ F, these instant units raise the temperature of tap water as needed – on demand. The savings in energy is obvious.

The units themselves take up far less space than a conventional hot water tank. In most cases only about 1/8th the space required for a standard hot water burner. It turns on only when needed. They don't experience the same wear and tear either.

Traditional storage heaters will maintain the water at a sustained temperature far above ambient and this causes elements to burn out or in common cases, the tank begins to leak from metal fatigue or too much heat. Installation of a tankless gas powered unit requires the services of a licensed plumber in most states. It is a similar process but the units themselves are more expensive than the traditional tank.

Instant Hot Water

This term, of course, is a misnomer. Just like a traditional storage model, the gas or electric versions takes time for the water to get from the unit to the faucet or shower head. If it takes 30 seconds for a standard water boiler, it may take 40 seconds for the tankless version. The difference is that the cold water coming through the system starts out cold rather than hot as in a standard tank. To solve the instant hot water problem, adding units closer to the user means that the water has a shorter distance to travel and thus allows it to heat up faster.

Essential Maintenance

Like everything mechanical, water heaters do have a limited functional life. Standard water heaters range from about 6 to 10 years depending upon the quality of the unit, the manufacturer and the use. Instant water heaters, on the other hand, last more than twice as long and rarely does anything go wrong with them. The amount of money saved in the cost of energy over the same period more than makes up for the higher purchase price and installation cost.

Inline Water Heating

Essentially the same as a conventional unit, the inline system heats hot water very close to the outlet. They are often used as a booster to commercial dishwashers or other areas that require very hot water. Hospitals, schools, restaurants, manufacturing plants, bottlers and other commercial applications often use a variety of inline water heaters. However, the homeowner can also use these for many uses through the property from dishwashing to cleaning the car. Units vary in price, but begin under $200.

There are both pros and cons to everything, but in the long run, the tankless unit will be far more cost effective.

Uses for these Specialized Devices

Hot water is something we take for granted. Whether using it for a morning shower or cleaning an old grease laden engine part, hot water is indispensable. But draining a 50 gallon hot water heater and waiting for it to re-heat is cause enough to look into replacement with either a larger tank or an continuous flow inline heater.

Consistent Hot Water

Any unit that interrupts the flow of ambient water by heating it on the run is considered an inline water heater. They are more often referred to as either gas or electric tank-less water heaters. One of the advantages over a tank-type unit is that a tankless system never runs out of hot water. When the faucet is turned on water flows through the small tankless system, either a gas burner or an electric element heats the water to a consistent high temperature. It stays on until the faucet is turned off. So even if you have 5 people in a row taking hot showers, using about 20 gallons of water each, a tankless version of your heater never runs cold.


Using an inline water heater in the bathroom means that there will never be a shortage of hot water. The units can be set up in parallel for simultaneous demands. Different size units are available depending upon the size of the family and specific use.


Besides having hot water available for cooking, an automatic dishwasher is the most common appliance to use an tank free heater. In many cases, it is used to boost the temperature for the dishwasher. A gas unit, when gas or LP is available, is very efficient in most warm weather climates


Heating a pool would be impossible for a tank-type system. Pools require a large amount of hot water to circulate throughout the night when the outside temperatures drop as the sun goes down. Using an inline heater is the only way to be guaranteed that hot water will be available when needed.

Commercial Uses

Inline water heaters have found acceptance in many commercial applications that require a large supply of continuous hot water. Among the applications are restaurants, schools, hospitals and laboratories. These units are often set up with thermostatic device that boost the temperature for long runs between the source and the function such as a commercial dishwasher. A thermostatic heater controls the precise temperature of the water.

Whole House Units

If the entire house or cabin needs to be heated for use at multiple points such as a kitchen and bathroom, then many smaller homes can get by with just a single unit or multiple units that are run together.

Among the better-known companies that manufacturer tankless heaters are Bosch, Rheem, Stiebel, Eemax, Rinnai, Paloma and Chronomite.

Since these inline models last 3 to 5 times longer than a tank type system, choosing the right unit to fit today’s particular needs is economical and efficient. In addition, they do add value to the home for the energy savings accrued over the life of the units.

Difference Between a Tankless Model and a Traditional Storage Tank Version

What is the main difference between a tankless hot water-heater and a traditional storage tank heater? Clearly, the obvious answer is that one has a storage tank and the other does not. But that's by no means all, that can be said, when it comes to comparing tank and tankless models. The absence of tank logically leads to mentioning the benefits arising from this feature.


First of all, tankless hot units are very efficient. They don't have a tank, and, therefore, do not need to constantly maintain the temperature of the heated water, ready for call off.

This means there is little heat loss and lower energy bills.

Environmental Credentials

The energy efficiency of these tank free devices mean they are viewed as being more environmentally friendly, saving energy and natural resources over their storage tanked cousins.

Space Requirements

Due to the absence of a storage tank, which may be very large in some households, these units can be installed in much smaller and more convenient locations.

Models Available

There are two main types of heater:


In this type of system, an electric element heats the water.


In this type of system, a gas burner heats the water. The gas used is usually propane, supplied from a tank.

Gas models generally create higher flow rates than electric systems.

Both systems have their respective merits, but when researching tankless water systems, you’ll find some units and brands more effective and energy efficient, therefore cost friendly, than others.

Most units deliver an instant supply of hot water, but some are easier to use and provide larger supplies of hot water than others. All units are different but, most units provide between 2 – 5 gallons of hot water per minute.

We recommend you read the reviews here in this article to help you determine which one is better for your home or use.

Frequently Asked Questions

How much does a tank free gas heater installation cost?

How much propane do does a gas heater burn?

Can I use one in line with a current boiler to maximize hot water output?

Do electric models save money on electric bills?

Are they suitable for northern climes?

How does hard water influence these particular heaters?

Can a one be placed on an easement?

Why are they called green?

How much hot water can you get with from these heaters?

What size unit is suitable for my needs?

How do you size the right heater for your needs?

Should I actually consider buying a one of these heaters?

Are they better than the storage tank equivalent?

Are they really energy-efficient?

Would using both a current boiler and tankless heaters in line increase efficiency of heating?

Why do they call them eco-friendly?

How do they actually work?

Can I use one and a reservoir style one at the same time?

Why is my water heater constantly moaning after use?

When using cold water only, does this still use installed heater?

Is it possible to transform a gas tankless hot model into an electric one by replacing some parts?

Comparing A Gas Vs Electric Equivalent

The choice between the two is simple. In many cases, however, the decision to go with a gas vs. electric unit is determined by circumstances beyond mere economic motivations. When it comes to either or, the benefits and disadvantages need to be considered.

Gas vs. Electric

Always go with the gas if it is available. The cost is less than electricity when measured on a per BTU (British Thermal Units) scale and they have higher flow rates and therefore more applicable uses. Electric powered versions on the other hand, require less space and lower operating costs then conventional tank-type heaters.

Energy Requirements

The gas requirements for a tankless gas water heater are about 4 times the amount for a tank-type unit when measured in BTUs because the tankless system use more energy to heat a smaller amount of water for a shorter period of time. The gas lines feeding the system usually need to be larger to accommodate the higher gas flow.

The same applies for a tankless electric option. Far more wattage is necessary to heat the water for a shorter period of time. In some older homes, the electric service and wiring leading to the heater also needs to be upgraded.

Ignition Systems

Whether you have a standard tank or a tankless system in place, the gas needs to be ignited whenever there is a need for hot water. Some have a standing pilot light that continuously burns gas. The burning of the pilot light generally means that the cost of operating gas tankless systems is higher then the electric equivalent.

As a result gas tankless heaters are generally used in high use applications, like restaurants or hotels. If the pilot goes out, the gas is automatically shut off to prevent leakage. Some models may overcome this drawback by using an electric ignition that creates a spark to ignite the gas.

Energy Factors

This is a term used to determine the efficiency of either a tankless gas or electric water heater. How much energy is need to heat a certain amount of water under normal circumstances. It also takes into account heat loss through the wiring, venting, combustion and the walls of the unit itself. Higher energy factor means a more efficient usage. Energy factors for tankless systems are always higher than for conventional tank-type heaters.

So although the costs to operate a gas or electric tankless heater are less over the long run, the cost of installation and possible upgrades needs to be taken into consideration when choosing between gas vs. electric water heaters.

Point-of-Use vs. Whole House Model

Tankless hot water heaters are available in two options. Point-of-use models and the whole house kind. They are different and will be ideal for different purposes.

Point of Use Tankless Water Heater

Point of use tankless models are inexpensive and very compact. Install a point of use heater right at the point where you require hot running water. This is usually below sinks and near showers. You may also use it to supply with water other key appliances, such as washing machines and dishwashers.

Points of use tankless devices are ideal if you only need hot water for specific reasons or individual appliances. If you need a larger volume of water. Or you need greater distribution. Say, for the whole household or a large family, on a daily basis, you would be better off with a whole house heater.

Whole House Tankless Heating

Whole house heaters are ideal when you want to supply the whole house with hot water. They heat water instantly, but, only when you actually need it. This is what makes tankless hot model so energy efficient, there is no energy loss.

The whole house heater is comparatively more expensive than the point of use option. However, they should not be directly compared to a point of use tankless water heater. You should compare a whole house tank-free heater against its tanked equivalent. If you do this then the costs are far more comparable.

Where You Might Need a Tankless Water Heater

The symptoms are easy to detect. A hot shower never gets really hot, but lukewarm instead. Or in some cases, the dishes aren’t clean when you remove them from the automatic dishwater. That’s usually the first sign of trouble of a heating problem.

But before you replace the unit, first determine where the problem lies. You may not really have such a problem with a typical tank-type water heater, and even less so with a tankless gas or electric water-heater. There are items to check before you spend a lot of money.

Energy Source

In all cases of electric water heater, the unit is on a separate electric circuit. A typical tank-type unit requires about 7000 watts of energy while a tankless electric water heater requires about 38,000 for an average household. If the breaker has been trip for whatever reason, resetting the breaker would be the very first item to check.

In the case of a gas heater, the most common problem is not that it runs out of gas, although in the case of propane that could easily be the culprit, but the pilot light mechanism could be inoperable. Either the pilot light could be out or the electric ignition may need to be cleaned or reset, or in the worst case replaced.


Tank-type water heaters have heating elements that burn out from constantly being turned on and turned off. Replacing the elements in an electric water heater is a simple step. They are designed for easy repair. Of course, don’t try to change it if you are in the dark as to where it is located on the tank itself. And by all means turn off the electricity to the unit before you start.

Tankless electric hot water heaters have sealed elements that last 3 to 4 times the standard elements, so there is less of a problem.


These can occur in a variety of different locations on the tank-type units. The outtake, drain faucet, around heating elements and any other connectors to the tank itself are just a sampling of the areas a leak can occur. When they do occur, it’s generally time to replace the tank.

With an electric or gas tankless unit these types of water heater problems rarely exist.

So before you decide to replace your water heater, check the alternatives to the water heater problems and save yourself some money.

Benefits of the These Heaters – Plumbers Advice

A tankless water heater is not only convenient, it is reliable and efficient also. Any plumber would advise you to buy a tankless heater in your house.

These chamberless water heaters, also known as inline, instantaneous or continuous flow, have every reason to be called a good option. Despite widespread scepticism, conventional water heaters do not compete with tankless ones in many household environments.

It goes without saying, they have no reservoir or tank to store the hot water. The process of heating takes a few seconds. That is the reason why they are called instantaneous. Having no tank has many benefits. For example, tankless water heaters don't have to keep heating previously heater water over and over again in order to maintain temperature. This advantage alone will reduce your energy bill.

Electric water heaters use energy to heat up water. They need a lot of energy while heating, and this is to be taken into account. Electric models are very good, when it comes to energy conservative. Indeed, they are associated with efficiency ratings at nearly 99%.

Tankless Heaters are Available for Specific Uses

Tank-less water heaters usually supply hot water to all appliances and for the whole house. However, there are smaller models that are designed to heat water for limited area. Point-of-use tankless device are very convenient to locate, for example one might place them under a sink.

The advantage of the point-of-use tankless hot water heater is their size. They are used to heat water for a specific area, which is cheaper then installing and using centralized tankless heater. Quite often point-of-use units are used in combination with a conventional centralized water heater with small reservoir.

They are convenient, efficient and reliable.

Compact Size

They can be placed almost everywhere. They don't have any reservoir, so their size is much smaller than that of conventional ones. The smaller size gives you options that are convenient to your circumstances. These options are not always available for whole house tanked water heaters.

If you have insufficient space in your home then a one of these heaters is the ideal solution.

Instant Heating

Continuous flow of hot water is an advantage that make people like this thing. Those who don't want to wait enjoy instant heating.

Hot water is always available on demand with these heaters.

Environmentally Friendly

To operate tankless heaters use only energy and gas, which makes them environmentally friendly. In contrast, conventional water heaters waste a lot of resources.

The energy efficiency of these units makes them many peoples’ preferred water heating option.

No Reservoir Corrosion

As there is no reservoir, they are not as susceptible to long term corrosion. It greatly contributes to the durability of your system. Corrosion is not totally avoided; however corrosion of pipes cannot be compared with the corrosion of a reservoir.

Other Factors to Consider

An important investigation you should carry before buying a unit is to go through the above reviews. This is essential, since it allows you to know first-hand truthful information from those utilizing this or that kind of device. Following are some guidelines on how to make proper and quick decision based on reviews.

Geographic Location and Weather

First thing to bear in mind is that water conditions vary depending on weather and geographic location. In different locations flow rate is also different. So, comparing reviews, make sure that people who wrote them are from similar geographic conditions at least.

Costs of Operation

In a study undertaken in 2010, researchers compared the cost of running a gas version against their tanked equivalents. The research showed that the savings obtained by using a heater not requiring a tank were 37% over their tank equivalents.

At that time, it should also be noted that the cost of the tankless heaters was also considered to be too high to make this payback worthwhile. Of course, as we have examined in this article, cost is not always the only reason to consider buying one. It should also be noted that the researchers did not look at electric powered heaters in the study.

Installation costs

Installation costs depend on whether your unit uses gas (tankless gas water heaters) or electricity (tankless electric water heater). Although it's considerably cheaper to install electricity operated heater, gas operated one is more efficient.

Installing A Direct Vent Water Heater

It is important to note that a direct vent water heater is used for gas water heaters in areas that make it difficult to vent through the roof. In fact it is ideal for homes or apartments that have difficult angles. The unit has it’s own built-in venting system that consists of a dual pipe that brings in fresh air from the outside and exhausts it through an adjacent wall. The system itself provides an airtight chamber for combustion of the gas that prevents back drafting, in which gas fumes foul up the air surrounding the water heater.

Installing this system will depend largely upon the layout and architecture of the dwelling. Switching to a tankless gas water heater will eliminate many of the problems associated with a tank-type heater. However, since it is still gas that is being used to heat the exchanger, fumes will come into play and using a direct vent system to exhaust them through the side of the building.

Since gas needs oxygen to burn properly, getting air into the unit is just a critical as removing the fumes. Fortunately, the smaller size of the tankless gas water heaters means that they can be installed in places that would normally not be used for a tank-type heater. One of the better aspects of this type of hot water heater is that the unit’s cover is sealed and does not use any air from the surrounding area.

Venting and installation of the units does require the use of a licensed plumber in almost all states. It is always recommended and highly encouraged to seek professionals for proper installation and safety.

The advantage of using a direct vent water heater is that it does not compete for air from within the home. In cold climates, non-direct vent installations can be affected by non-combustible air entering the home and causing negative pressure, thereby freezing the unit and causing an expensive repair bill. Since the tankless gas water heaters can be place anywhere with a direct vent and fan assisted, there usage and value cannot be underestimated.

Electricity or Gas Costs in your Local Area

The cost of gas and electricity locally will influence you decision over which tankless water heating system is most appropriate for your home.

Requirement for Water

You need to consider the need for hot water, whether it is for the whole household or specific appliances. Also, if it is for the whole household how many that household normally is and therefore the volume of water you need.

Safety features

Any household appliance that uses gas or electricity has potential risks. Ensure you purchase and install the right product for your home. Ensure the water heater you intend to buy has a carbon monoxide detector and a heat exchanger (to prevent the unit overheating).

Your preferred option should also be UL or ETL listed.

You should consider the reputation of the company selling the heater. Look online for any reviews and pay close attention to dissatisfied customers.

Warranty provided

You should ensure you get a manufacturers warranty, the longer the better and the more it covers the better too.


For whatever reason, the first thing that comes to everybody's mind is that tankless water heating units are more attractive because they don't have a water tank. Physical appearance, however, is not the only advantage of not having a tank. Tankless units are more lasting. The absence of water tanks means that there's no space for corrosion, and fewer parts of the units require less maintenance. So, one of these heaters serve up to twenty years and more against traditional units with its 5-10 year life expectancy. The abscence of geysers, which sometimes burst, means extended warranty from your insurance company.

Returning to the aesthetic aspect, it's worth saying that a tank less water-heater is of huge value for those who cares for good appearance of their home. These units are very compact and can be either mounted on the wall or build in the structure of your home.

Green Product and Government Rebate

These models consist of fewer parts, as compared to traditional units. They use less resource and, therefore, produce less pollution. These heaters well deserve the status of a green product, which has also been approved by government. Seeing the benefits of employing tankless units in household, many governments promote the purchase of these products, by giving rebates up to 30% on your tax for your purchase.

Our View

​Tankless water heaters are an energy efficient, space saving alternative to the traditional storage tank water heating system. They add flexibility and convenience to the process of heating water with the option of whole house systems, or just point of use systems.

That said, tankless water heaters are generally more expensive both to purchase and install and these factors should definitely be taken into account when making your water heating decision. We like tankless water heaters. We believe that they will become more and more popular and that prices will fall accordingly.

Read the tankless water heater reviews. We hope the information contained within will assist you in making the best tankless water heater buying choice.​