Best Tankless Water Heater Reviews – Buyer’s Guide | 2018


I recently went out to check the best tankless water heater reviews and all i got was poor reviews from everyone even some favourite sites for my gadgets reviews.

When searching for the residential tankless water heaters, also called on-demand and instant hot water heaters, it is important to know that the tankless system and heating process is different from the tank-type systems.

There is a lot to read about tankless… so if you would like to know about the best models and check the reviews – read this article. If you would like to buy Rinnai, Noritz, Rheem, Navien, Stiebel Eltron, Eemax, Rheem or any other of the top models and are often on sale, check out the

If you’re already looking into tankless water heaters, you’ve probably heard about many of the benefits. You know these units will save you a significant amount of money on your utility bills over the long term -saving most buyers an average of 1/3 their fuel costs!

You also know that they have the potential to provide unlimited, continuous hot water. They’re not limited by their tank size, which means you won’t have any limits on the amount of hot water you can access!

If any of these benefits are new to you, you can read more on the pros and cons of tankless water heaters here! To make a long story short, they’re one of the best investments a homeowner can make right now.

The downside of having such an exciting new product is that many companies jump on the bandwagon. Tankless water heaters are incredibly popular, and many companies have cranked out their own versions without taking the time to engineer or build them properly.

Best Tankless Water Heater Reviews

We present to you the Best Tankless Water Heater Reviews

Takagi Indoor Tankless Water Heater

If you are a nuclear family or an empty nester, this is just the right choice for your home! Compact enough to fit anywhere, it gives you the hot water you need for a shower, washing, laundry and running the dishwasher.

You can use a few water outlets at once and get the right amount of warm water sufficient enough for a small family.

It comes with a good warranty but it is only applicable if you employ the services of a company certified technician. However, if you wish to install the same by yourself, you may do so with the least effort involved on your part too. Just make sure you go through the complete manual and directions before attempting to install the unit.

We hope this review for the best gas tankless water heater gives you the right directions to buy the best one to suit your family’s needs.

Rheem RTG-95XLN Outdoor NG Tankless Water Heater

Are you looking for a non-stop hot water supply for your home? Here’s the ultimate product for you.

Easy enough to be installed by anyone who has a basic knowledge of the technicalities a tankless gas water heater involves, it is one safe and energy efficient model.

You can easily set it up anywhere outside the house, in a ventilated area and save your indoors’ space for something else.

It comes with a remote controller for temperature adjustments and for turning the unit off/on without having to step out of the convenience of your house.

Enjoy the same level of warmth throughout the day and night with this best tankless water heater.

Bosch Therm 520 HN

A great tankless gas water heater which can be installed anywhere inside the house. It includes separate controls for setting the temperature as well as the right gas pressure.

Running entirely on gas, it is the best one to go for if you live in an area where there are frequent power outages or if you are simply looking for a unit which cuts down your electricity bills.

Very energy efficient, the overall operational costs are very low and it brings a significant reduction in your gas and electricity consumption pattern.

The burner starts up automatically; the unit converts the hydropower to help in the ignition and provides warm water at the most comfortable level for the entire house.

Small and compact it is great enough to provide hot water supply comfortably to two bathrooms at a time.

Eccotemp L10 High Capacity Outdoor Tankless Water Heater

Are you looking for a small, compact and low-cost version of these tankless water heaters? The Eccotemp L10 is designed to provide sufficient warm water for a small cottage or cabin.

Very simple and easy to be installed outside; it also comes with a ‘rain cap’ to shield it against water or rain.

This unit runs on batteries, so saves considerably on you electricity as well as gas bills. It is very pocket-friendly as compared to the rest and perfectly suits a small condo or apartment. Also, includes certain safety features as part of its design. It turns off by itself after 20 minutes to avoid overheating and restarts when required on its own.

The after sales support is excellent and all queries and complaints are handled timely by their expert technicians.

Ecosmart ECO 27 Electric Tankless Water Heater

3If you are living in a normal sized apartment or house and have a small family of say five or six individuals, this is the perfect water heater to bring home.  Running entirely on electricity, it is a very energy efficient unit and can help you save up to 50% in your overall costs.

Made to last you for a very long time, even if any part gets damaged, you needn’t worry. It can easily be replaced.

If you plan to install it indoors, it is designed to look aesthetically very pleasant and appealing, unlike other brands.

Small but good enough to serve an entire household, this unit is very easy to set up; however, you just need to ensure its compatibility with your current electrical system. Very smart in terms of usage and saving money, this is the best electric tankless water heater for review and employment in your home.

Stiebel Eltron Tempra 29 Plus Electric Tankless Water Heater

A very efficient electric tankless water heater, which makes use of three internal heating units to provide you with the same level of warm water all the time.

It may lower the quantity of water it provides if the demand ever increases too high for it to handle, but the temperature is retained to give you the same comfortable warm water whenever you require.

You can set up a precise temperature through its digital display controller.

It also includes a three-year warranty for its parts and a seven-year warranty against any leakages, only if you let a certified professional do the installation.

It is a very reliable model and can be fixed anywhere at your convenience; this one never runs cold on you!

Rinnai RL75eN Natural Gas Tankless Water Heater

This type comes with a twelve year warranty period, which is good enough for any water heater.

The Rinnai RL75eN Natural Gas Tankless Water Heater should, however, only be installed by a certified expert. It involves certain technicalities to do the job and failing to install it right, could cause damage or affect its performance.

It may take a minute for the warm water to reach the faucet but, it is great to be placed anywhere in the house or outside as long as there’s a vent.

Chronomite SR-20L/240 HTR

One of the very best electric tankless water heaters, this is a small sized, light weight and  compact unit, small enough to be fixed even under the sink. Yet, it has the strength to provide warm water to the farthest water faucet or shower in the house.

Very simple and convenient to install, it just requires a simple mounting up on the wall and connection to the electricity outlet and water supply pipe.

It works on small quantities of water at a time and yields a high level of efficiency.

You can immerse yourself in the most comfortable warm water bath just within seconds of turning on the water faucet or shower. The temperature remains consistent throughout, at your desired level of comfort.

Noritz NRC661-DV-NG

Fit for smaller family setups, this is one compact, water heater. Works on natural gas for giving you your required hot water as per your needs, but also makes use of electricity for ignition and avoiding freezing of its components during the winters.

You can control temperature with ease using its remote control or the easy to use temperature controller fixed on the unit. Very efficient and provides economical usage of both electricity as well as gas.

You can avail a 12-year warranty with this unit along with several built-in safety measures like heating sensors, temperature lock and freezing and flame protection mechanisms.

Easy to be installed indoors, this unit will not disappoint you and give you the warm water bath you so deserve, anytime you want.

Best Tankless Water Heaters Buying Guide

These water heaters work as per the demand and heat the water quickly as it goes through the heat exchange. It is not just quick, but also conserves gas and electricity that others continuously make use of as they keep heating and reheating the water as the temperature drops below the defined level.

This way it saves up to 35% in your bills and also takes care of the environment and resources.

Before you set out to buy your new water heater, always conduct a certain market research and get to know about the available options and the specifications of each. This will help you in later on deciding upon the right one for your family.

There are several essential points to note before setting out in the markets, such as:


Almost all water heaters are priced and sold based on their capacity. They are classified for family sizes according to their holding capacities too.

For instance, a smaller family may not have much needs, whereas a larger family may require a lot of warm water for showers, dishwashing, clothes washing, etc. they will, therefore, need a larger tank to get more hot water to last them through the day.

However, for the tankless water heaters, you need to consider the GPM: Gallons per Minute to know the amount of water they can heat and provide in the first one hour. The best tankless hot water heaters provide a non-stop flow of hot water, unless, you open up many faucets all over the house.

If you are a large family and require hot water at different places at the same time, you may install two or three units of the same to keep the water going warm to meet your requirement.

Water heater types

The next thing to consider is the type of water heater to choose. There are various types available in the markets today, like:

Water heater with the storage tank

The most commonly found in all homes is the storage tank water heater. This has a tank in which the water is heated and stored and refilled when used up.

These are often run by gas and cost almost half as much in running than the electric water heaters. However, their buying price is higher than the other options.

Hybrid water heaters

These are quite energy efficient too, they work by catching heat from the air and using it to heat the water.

However, these have one flaw; they are not that great in terms of performing in extremely cold climates.

They also need a lot of vertical space to stand and a great open space to catch heat easily.

Solar heater

These types of water heaters convert the heat taken from the sun to a fluid; this fluid goes through the loops and keeps the water warm in the tank. These are more suited for the summers or hot climates, where the sun is out most of the times.

However, during the cold days when the sun isn’t out much, they work rather slowly.

Condensing heaters

These are great as a gas heater and if you have a larger family and hence, need more hot water.

These too have a tank like the conventional water heaters but are more energy efficient as compared to them.

Anti-scaling and warranty period

Many models are available with the benefit that they do not let any minerals settle at the bottom. This helps is increasing the lifespan of a unit. However, if a particular water heater comes with a good warranty (Typically over 10 years) you should buy that.

There are good water heaters available in the market which come with a warranty of about 3 years or 5 years, etc. but could vary in their costs as the warranty period increases. If you plan on the long run, buy the ones which are covered over longer lengths to ensure a greater durability.

The drain valves

Fitted at the base, these are made for drainage purposes. There are two types in this category; plastic and brass. It is best to go for the brass ones for a greater durability of the model.


With technology digitizing everything, newer models are being manufactured with digital displays. These help you in more customization and conservation of energy and gas while the hot water is not in use.


Different models are available at different prices. The ones which enable a more flow of warm water are more powerful and hence more costly. Then, the electric and gas types, are priced differently. However as discussed above on average it may cost you around $500 to $600, more or less depending on your needs.

The source of fuel

Your home may have either an electric, gas or a hybrid fuel source. You need to consider the source you have in place, for ease of installation of a new water heater. The electric type involves the use of a single or dual elements for heating the water, whereas the gas types use a burner for heating.


The best thing about these tankless water heaters is that they occupy a much smaller space than the conventional ones.

Temperature control

The latest models allow a greater temperature control and other features to operate it as per your requirements. This further increases their efficiency in terms of energy as well as operational costs.


Another latest feature of these water heaters is the wireless connectivity. It allows you to control them from a larger distance. It helps you to match your schedule with the water heating and save on your electrical/gas bill.

Just like the traditional water heaters, the tankless heaters are available in different sizes to cater to individual needs or a large house.

You need to see the number of people in the house, the number of water outlets, including taps, showers, washing machine, dishwashers, etc. you will use and compare that to the total gallons or amount of water the water heater supplies.

There is another option for buying two units too, this way the total load is divided for the house and you can place the two units on different ends to ensure an optimal supply of warm water for all the household needs.

Once you go through these essential considerations, it will be much easier for you to make the right decision. There are a few more key points to take note of before deciding on the one best choice for your home; a few of these are discussed below:

Hot water requirement

Consider the amount of hot water required in your house. You may use various charts available to calculate the GPM (Gallons Per Minute) for each water outlet in the house and find the total for the house. This way, you can find just the right tankless water heater for your home.

Calculate the water temperature

To know the exact temperature you need, you have to make a certain calculation. The difference between the groundwater temperature and the water temperature you require determines the temperature you should look for in a water heater.

A few additional tips regarding the installation of a typical tankless water heater include:

  • Install your unit where there is sufficient ventilation for the system.
  • The best place to fix the tankless unit is near the gas supply as well as water supply, for the gas heaters, whereas for the electrical heaters the best place for installation is near an electrical power outlet.

This enables a safer installation and a lesser wiring or gas pipes are required for the water heater.

  • For increased safety, employ professionals for installation of your unit.
  • The tankless water heater should not touch the ground or sides. Ideally, it should be at, at least about half an inch distance from the wall and have a foot space at the front and a foot and a half above the ground.

So, which one is an ideal water heater for your home?

The most common water heaters these days are the tankless heaters. It gives you multiple benefits including the following:It is very energy efficient. It heats up the water that is used only and doesn’t have to work for hours heating and reheating the gallons of water, like the tank heaters do, over and over again.

There are two types of these; one runs on the electricity whereas the other type uses gas for heating water. So you can select the best one for your needs.

Although water heaters are not a cheap product, but you can select one according to your needs and price. The considerably lower priced models may have a shorter warranty period or ability to provide hot water if you use a single or two faucets only, at a time.

However, over the long run, these prove to cost you much lower than the conventional heaters.

  1. The best thing about this heater is that the water doesn’t run out. There’s plenty for everyone all the time. It is best suited for large families as well as businesses, where time is the key resource and there is a far greater requirement for hot water.
  2. These heaters are safe against electricity or gas fluctuations, and consistent in their work.
  3. They require much lesser space as compared to the conventional tanks and can be fixed anywhere you like.
  4. Since there is no water storage, it greatly reduces the dangers of rust and spills.

To get the most out of your installed unit, check out a few tips here. Just ensure you take periodic care of the unit to make it last longer and perform better.

Gas Tankless Water Heater VS Electric Tankless Water Heater?

The best bet would be to replace your existing tank water heater with the same source of the tankless one. i.e. if you have a gas water heater and you need to replace it with a tankless one,it is better to buy a gas tankless water heater.

Even if you buy the best electric tankless water heater for your house, it will require some additional expenses in the form of added lines for its installation and so, it raises the overall costs.

However, still is the cost is not a concern, you may buy either of the two.

Tankless Water Heater Efficiency?

These tankless units are surprisingly great conserves of electricity and gas. If you already have a larger water heater with the storage tank fitted in your house, it may be costing you much more than you really require. Just have a look at your daily requirements.

Typically warm water is required for:

  1. Bath which takes 10 to 20 minutes on average
  2. Washing a few minutes
  3. Dishwasher which takes 30 minutes, just to keep a safer margin,
  4. And if you desire any laundry with the ‘hot’ mode on.

If you analyze the above, you will see that the actual time you need the water accounts for a few hours only of an entire day. But the water tank has to have a full tank of warm water, all through the 24 hours!

This actually takes up a lot of energy, which may be put to some other productive use if not wasted here. With the tankless water heaters, there is no such wastage. It works just to fulfill your demand for the hot water and yet, never disappoints.

Hence, the operational cost of these tankless water heaters is much less than the water heaters which come with a storage tank. They cost about 40% less in operation as compared to an electric tank water heater and about 30% less than a gas water heater with tank storage.

As for the cost, it is about 2-3 times more than the conventional ones, but they come with lesser issues of corrosion and seepage. Plus, the overall operational costs, conserve much more energy and lower your bills; this way you can recover the cost much sooner.

Tankless Water Heater Installation?

Yes, it is quite easy to install the unit if you have a basic knowledge about these water heaters. However, keep in mind that the installation affects the warranty of the unit.

To be on a safer side, we recommend letting a professional do the job for you, however, if you feel no such need of employing one, you need to thoroughly study the manual that comes with your unit.

If the unit is installed right, it can help you achieve optimal efficiency.

To ensure a proper installation of the unit, keep the usual weather, safety concerns, and the fuel type into consideration to avoid any issues from arising later on.

If you wish to employ the services of an external contractor to assist in the installation, you can always check for the references of the seller, check for his background company and see if the company abides by the building laws and understands other legal codes about the local buildings.


As discussed above, there are various benefits of the tankless water heater. This is the best tankless water heater review for your convenience and to give you a fair idea about the market prices and features of these heaters.

Make a wise choice and invest in an efficient, best tankless water heater for your home today and pamper yourself with a warm water bath, whenever you want!

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