Best Tankless Water Heaters of 2019 Complete Reviews with Comparison

Best Tankless Water Heater Reviews

It happens most of the time that you run out of hot water while taking a shower, but this would not be the case if you have a tankless water heater at your place, as there can be nothing worse than stepping into the bath in cold weather with freezing water. A good quality hot water tank would solve this problem for your family, as it gives you hot water all the time and you would never run out of hot water ever again. Not only this it saves money as well in the long run by lessening the electricity bill of your house.

The best tankless water heaters provide hot water round the clock by taking care of your electricity bills as well. The best thing about them is they are very sleek and slim as compared to the conventional heaters; the best-rated tankless heater needs a small amount of space. Therefore, the convenient part of these heaters is that you would not have to shamble your house here and there to shelter it.

Well, the best tankless hot water heater is made to make our lives and daily routine easier and more convenient. Everyone has one question in mind while they buy a tankless water heater and that is what is the best tankless water heater? Which is the best-rated tankless water heater? Which one would suit their requirements? and many more questions like this.

Top 5 Tankless Water Heater Comparison Chart


Rinnai RUC98iN Ultra Series Natural Gas Tank less Water Heater
It runs on gas and has an efficient emission system. It provides hot water at a very high rate. It is ideally suited for big houses. It is easy to install and two venting options.

Thermo flow Elex 3.5 Point-of-Use Tank less Water Heater Electric for Sinks
Efficient heating mechanism and longer life span. It is small in size and hence portable. Has a wall mounted design?

Eco Smart ECO 27 Electric Tank less Water Heater
It features good water flow rate. Saves energy and has very negligible running costs. Made of copper and steel and does not rust easily.

Stiebel Eltron 36 Plus Tempra Tank less Water Heater
Advance flow control technology. Does not produce any noise and works silently. It consumes less energy.

Titan SCR2 N-120 Electric Tank less Water Heater 220 Volts
It is lightweight and simple design. It comes with 10-year warranty. It is effective for hardware usage. It features up to 60 % energy savings.

Tankless Water Heater Reviews

Here are the best 5 tankless water heaters which would help you understand the features, brands, pros, and cons of each.

1. Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater

This tanker is said to be one of the most energy saving tankers. It is said to be the sole manufacturer to provide PVC and concentric venting options that provide you with the option to install it in the way you would like to.

Product Highlights

It is made up of new technology which out turns less CO2 discharge, on the other hand, the emission of Nox is also pretty low which means it is good for the health and environment too. Usually, people face issue with the natural gas heaters of venting but this would not be the case if you opt for Rinnai RUC98iN Ultra Series tankless heater. It is equipped with 2 venting options which are twin pipe and concentric- PVC. You can choose anyone from the two which you find convenient and simple to install and you would start getting hot water from it.

If we see quantitatively this tankless water heater provides hot water at a rate of 9.8GPM which is quite high. The flow rate comes from the natural gas intake that ranges from 15,200- 199,000 BTU. The condition is that if you are able to provide the needs gas it would also give you the required water flow rate. This is also beneficial if you own a big house or have a large family, you can be rest-assured that without a break this water tanker would give you boiling water.

Usually, people have an issue with this type of water heaters that they have an adverse effect on the environment. As they think that these heaters out turns an ample amount of carbon in the atmosphere and pollute it. But this heater has changed this perception in people’s mind by providing.95% efficiency rating. As compared to the other heaters in the market this is one of the best and effective one.

What We Like About Rinnai RUC98iN Ultra Series Natural Gas Tank less Water Heater

Majority of the tank less heaters blench in front of this heater because of the water flow rate that it offers. Rinnai also offers 12 months warranty on heat ex-changer. This heater is very much in demand because of the features that it does not affect the environment, is very easy to install and it provides 2 venting options as well.

What We Do not Like About Rinnai RUC98iN Ultra Series Natural Gas Tank less Water Heater

The major drawback that has been observed about that it is comparatively difficult to install and if you want to install it yourself then it requires a lot of research.

Rinnai Natural Gas Tankless Water Heater

2. Thermo Flow Elex 3.5 Point-of-Use Tankless Water Heater Electric for Sinks

This water heater is well known for saving energy and money. With the help of this water heater, you can get limitless hot water. There is absolutely no need to preheat this water heater prior using it. Whenever you open the tap you would get hot water. You can also set the temperature according to your requirements.

Product Highlights

It is said to be a highly efficient and cost-effective water heater. When we compare it to the other water heaters they are even better as they have a very compact design. This water heater is said to be very small in size that it can fit anywhere in the kitchen and can be easily hidden as well. It has a wall mounted design which gives more space in the kitchen for extra storage. The best part about it is that it can be easily installed in washbasin and or any other place.

If you are someone who wants to save a lot of electricity then this is the product you should opt for as it saves up to 60% of the energy as compared to the other electric water heaters. It is made up of advanced technology which eliminates storage and circulation losses. This heater requires less maintenance because of the free bare wire and the heating system. It is made up of superior quality.

What We Like About Thermo Flow Elex 3.5 Point-of-Use Tankless Water Heater

It comes with a longer lifespan and it has acid resistance as well. It has instant heating efficiency which is said to be around 99%. This product is a must buy because of the excellent features that it provides.

What We Do Not Like About Thermo Flow Elex 3.5 Point-of-Use Tankless Water Heater Electric for Sinks

There are very few things which are not so good about this product one of them is that it is comparatively expensive as compared to the other options available in the same range and also it requires regular maintenance which becomes really hectic in today’s busy schedule.

 Thermo Flow Tankless Water Heater Electric

3. Eco Smart ECO 27 Electric Tankless Water Heater

The name of this tankless water heater comes on the top when discussing the features and price, as this brand offers durable and best water heaters. The features provided by this water heater forces us to put this heater on the top list. This product provides complete value for money and is mostly recommended for all and is always in demand.

Product Highlights

This heater provides an excellent water flow rate of 3GPM. The best part about this heater is that can very easily run 2 showers at the same time. It saves a lot of energy and has a negligible running cost and it takes energy only when needed that is the only reason your electricity bills would be low. It is made up of copper and stainless steel elements as part of the heater. The superlative thing about the product is that it does not rust easily and is very durable.

What We Like About Eco Smart ECO 27 Electric Tankless Water Heater

It can withstand high temperature easily while transferring the heat from one corner to another because of the material used to make this product, this heater is very robust and easy to use and install. Not to say, above all this heater is very durable, value for money provides all the features required in a good water heater.

What We Do Not Like About Eco Smart ECO 27 Electric Tankless Water Heater

They say that they provide a lifetime warranty but there are many customers who claim that there are so many clauses in it that it is almost impossible to claim that.

4. Stiebel Eltron 36 Plus Tempra Tank Less Water Heater

This product’s manufacturer is Stiebel Eltron which is a leader and pioneer in tankless heating technology from over 85 years. Many people have started shifting towards this technology; the major reason behind the shift towards tankless water heaters is because of their low noise. Though not all of them work quietly the Stiebel Eltron 36 plus Tempra tankless water heater does work silently as it has no mechanical switches and it does not allow the high-grade electronic parts to vibrate.

Product Highlights

This tankless water heater is equipped with advanced flow control technology. This technology is just like the backbone of this heater as which keeps the water temperature constant no matter how much you keep experimenting with the flow rate. This geyser is very good looking and stylish which comes in white color. It gives a three years parts and 7 years leakage warranty if only purchased from a legitimate website or distributor. It also warns you that if this product is bought from an unauthorized dealer, the warranty could also get void.

What We Like About Stiebel Eltron 36 Plus Tempra Tank Less Water Heater

Due to its reliable cover and inner electronic parts, this geyser is silent. Also, it is endowed with self-modulating technology, which makes it energy efficient and consumes less energy as compared to other geysers. It is extra sleek which makes it compatible to fit anywhere.

What We Don’t Like About Stiebel Eltron 36 plus Tempra Tank Less Water Heater

One major drawback of these types of geysers is that they are not able to maintain the temperature on much higher flow rates. They are unable to keep the temperature of the water stable only when the output of water is increased.

5. Titan SCR2 N-120 Electric Tank Less Water Heater

It is one of the most advanced tankless water heaters which is created by Niagra Industries. This geyser uses technology to enhance the performance with accurate and much faster temperature control. It features the water and air differential analyzing system for the prevention of dry start while the digital microprocessor which is integrated checks the output and input water temperature 21 times per second.

Product Highlights

They don’t have any exquisite design but much lighter in weight and smaller in size. It provides a 10-year warranty on all the components of this product. It is equipped with shielded Nicolay heating elements coated with brass and copper. This proves helpful for you when your plumbing system throws out hard water as it reduces the effect of that water and makes it a bit soft.

What We Like About Titan SCR2 N-120 Electric Tankless Water Heater

This tankless water heating technology saves 60% of the energy which even has a quick water heating capacity. The system to function is very simple for the users; the customers don’t even need to read the buyers guide. It keeps the water temperature stable as it’s the outer body is made up of a material which does not let the heat comes out. It is also loaded with a fully automatic control system.

What We Don’t Like About Titan SCR2 N-120 Electric Tankless Water Heater

It is also not suitable for extreme places where the cold water temperature is more than 69 F as you may not get the desired results. If the user does not switch off the switch after the use, overheating could take place.

Titan Electric Tank Less Water Heater

Tankless Water Heater Buyer’s Guide

While thinking of buying a Tankless water heater, look out for the below features.

  • What is the source of fuel? You need to also look out for energy star ratings.
  • Usage: Will the heater be used for single use or for the whole household?
  • The capacity of the tankless water heater. In general, it ranges between 2 -11 gallons per minute.
  • Price of the water heater. You need to also factor in the running costs. Few of the heaters come at less price but their running costs are higher. Check for options that would provide you savings in the longer run.
  • Size. Depending on the availability of the space, the size of the heater can be determined. There can be a trade-off between the size and the capacity of the heater.

Tankless Water Heater FAQs

In This Model of Rinnai Natural Gas Tank Less Water Heater Twin Pipe, what Does The Twin Pipe Mean? And Please Let us Know About The Flush Kit, is it Included?

It means it can be used as a dual or concentric pipe. No, the flush kit is not included; if you need it you have to purchase it separately.

Can Thermo Flow Elex Tankless Water Heater be Used For a Shower?

It can be used for a sink but not for a shower.

Can you Supplement Eco-smart Electric Tank Less Water Heater Along With a Standard Tank And Assuring You Never Run Out of Hot Water?

Absolutely, you can. The warmer the temperature of the water is becoming in the unit, its capacity to handle keeps on increasing. It will work when you run this product on the backside of the traditional tank.

Can The Titan 120 Electric Tank Less Water Heaters be Installed Indoors and Outdoors?

Yes, it can be installed indoors. In fact, the closer you keep it to the point of use, the better results it will give. Just need to make sure the air vents are not blocking and the geyser have adequate space around it. No, it cannot be installed outdoors.

Can Stiebel Eltron 36 Plus Tempra Tank Less Water Heater be Used to Supplement The 50 Gallon Electric Water Heater, Fixing it in The Bathroom?

Yes, it can be used for the whole house (1200 sq ft area) indeed. It can be used even in the kitchen, washing area and bathrooms.

Final Verdict

Choosing the best tankless water heater can become a bit convoluted but now, after knowing about all these tankless water heaters the problem of selecting one of them is not that intricate. Besides testing the pros and cons of different kinds of tankless water heaters, being enlightened about divergent tankless heater brands was very crucial before the perfect and best buy but according to us Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater is the best. As per the technical and market research, we have gathered the information on all the water heaters so that you could effortlessly go for the option suitable as per your needs and desire.

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