If you are the one who wants to switch from the traditional water heater to the tankless water heater then you are at the right place!
What if i tell you that choosing the best tankless water heater online shouldn't be so confusing?
There are many options to choose from, but how would you know which one is good for you?
There are a few excellent companies out there which make durable and efficient tankless water heaters, also, there are some of the new companies which are not famous but they do make awesome water heaters.
To help you out, we have researched and compiled a list of reviews of the very best tankless water heaters on the market in 2018 which are on demand water heater as well!
This guide will help you no matter your budget, we have budget friendly options as well as high end products.
These instantaneous water heaters are really good for home use as well as any other places.
If you are someone who's in hurry and want to make quick decision then here are the 2 best electric and natural gas tankless water heater!
Have a look!
- 1 Best Tankless Water Heater Review - on demand
- 1.1 Best Electric tankless water heater reviews
- 1.1.1 Atmor Electric water heater review – Compact electric tankless water heater
- 1.1.2 Stiebel Eltron Tempra Plus 36 electric water heater review – Best rated on amazon
- 1.1.3 Rheem RTEX-13 Tankless Water Heater review – cheap electric water heater
- 1.1.4 Eccotemp FVI-12 Electric Tankless water heater review – cheapest electric water heater on the list
- 1.1.5 Ecosmart ECO 27 electric tankless water heater – Editor's choice
- 1.1.6 Stiebel Eltron Tempra 24 plus Electric tankless water heater review- Rated 4.5 by more than 500 customers
- 1.2 Natural gas & Liquid propane tankless water heater reviews
- 1.2.1 Takagi T-K4-OS-NG Tankless water heater review – Highly rated Natural gas tankless water heater
- 1.2.2 Rheem RTG-84XLN Natural gas tankless water heater review – High volume tankless water heater
- 1.2.3 Rinnai RUR98iN Ultra series natural gas tankless water heater – High end tankless water heater
- 1.2.4 Rheem RTGH-95DVLN & RTGH-95XLN tankless water heater – Top Direct Vent Water heater
- 1.2.5 Takagi T-KJr2-IN-NG Natural gas tankless water heater review – Cheap and high-volume water heater
- 1.2.6 Eccotemp L10 Outdoor tankless water heater – Best for camping and Portable
- 1.3 Wrapping it up!
- 1.1 Best Electric tankless water heater reviews
Best Tankless Water Heater - Buyer's guide
Obviously the most important factor for most people would be the price of the tankless water heater. We have always suggested customers to try and go for higher end products because they are much more durable and efficient. But sometimes cheap products also do make good investments (in which case we will point you out for the best cheap ones)
This solely depends on the number of people using the water heater, if you have a family then you would want to buy a big tankless water heater to accommodate hot water for everyone, whereas, if you live alone then a smaller would be good.
Sometimes the home builder give you a specific corner or cut out to put your water heater, in which case you should check it the tankless water heater will fit inside it along with all its cables and pipes.
Energy star ratings:
Checkout what kind of energy rating the tankless water has got, you will find many water heaters which are rated to save a lot of power.
Some tankless water heaters require a professional to install it, whereas some of them can be installed by any person. Checkout with the manufacturer if they will send a technician to install your tankless water heater.
This can be anything like: Wi-Fi control, automatic shutdown and many other things. Checkout what kind of extra features do you get when purchasing the best tankless water heater.
Rate of flow:
You would see GPA (gallons per minute) term everywhere when you checkout products. This simply means the amount of hot water a tankless water heater can provide you with. If you have got 2 or 3 hot water taps in your house running simultaneously then you should opt for a product which has a higher GPM.
Last but not the least, you can get different types of water heaters. It can be electric, natural gas heater and liquid propane heaters. Depending on the availability of the fuel in your area, you should buy the one which costs you minimum.
So, those were the basic features that you should look out for when buying the best tankless water heater in 2018.
So, let's have a look at the quick comparison table of the best tankless water heater!
Best Tankless Water Heater Review - on demand
Flow Rate GPM
7 on leakage and 2 on parts
7 on leakage and 3 on parts
5 on heater chamber and 1 on parts
7 on leakage and 3 on parts
15 on heat exchanger and 5 on residential use
Alright, so let’s start with the reviews now!
We have made two sections for different buyers, one for electric tankless water heaters and another one contains the reviews of natural gas & liquid propane tankless water heaters.
Best Electric tankless water heater reviews
So Now, Let's have a look at the Best Electric tankless water heater reviews!
Atmor Electric water heater review – Compact electric tankless water heater
This is one of the best electric water heaters on the market in 2018. It has also received very good reviews on amazon by many customers.
If you do not have access to liquid propane or natural gas then this is the water heater you should go for.
This electric tankless water heater will provide you with an unlimited supply of hot water on demand. You don’t have to wait for the boiler to get started anymore, you will get instant hot water with this best tankless water heater.
This water heater also saves energy!
This electric water heater has advanced Thermopro self-modulating system that will control the amount of energy required to heat up the water which in turn will save electricity.
Isn’t that cool?
The interior of this water heater is made with stainless steel which makes it corrosion resistant and durable.
The compact size, space saving design and no need for venting makes it a very good choice for anyone.
Perfect for installing in you home or garage, this best electric tankless water heater will provide you with a GPM of 3.7, which is enough for running 3 taps at once.
You also get an easy to use digital control unit along with an IP54 certification for being splash proof. This certification will allow you to install this electric heater inside your bathroom as well.
The overall dimensions of this electric tankless water heater are 17.375 X 13.375 X 5.25 and the weight of the water heater is 17 pounds.
you will get a 7 year warranty against leakage and 2 year warranty on parts with this electric tankless water heater.
This is a really nice compact electric water heater which comes with a long warranty as well. You get high rate of hot water flow along with good quality and durable construction.
Buy it from amazon today if you are looking for a very good electric heater on the market.
Stiebel Eltron Tempra Plus 36 electric water heater review – Best rated on amazon
This German made best rated electric water heater is the perfect choice for any home.
It is compact, does not need venting, runs very silently and can provide instant hot water on demand.
According to us, this is the best electric water heater in the market tight now!
With 90 years of water heater manufacturing experience, Stiebel Eltron has become a pro when it comes to giving the customers excellent products.
With this electric water heater, you no longer need to has standby losses and waiting times. You get unlimited supply of hot water as long as you want!
One of the features that we love in this electric water heater is that when the hot water demand increases, the water heater automatically adjusts itself to provide you the same temperature water without any fluctuations.
Isn’t that really intelligent?
See the picture below which shows you the inner construction and precision of this Water heater. They work hard to provide you with the best quality possible.
The self-modulating technology in this water heater makes it 99% energy efficient. It will use the least amount of energy so you can save up on bills.
We can definitely say that this best rated electric tankless water heater will give you more comfort and reliability than any other brand on the market. You will get a flow rate of about 0.77 gallons per minute with this water heater.
With the simple to use digital temperature control unit, it is very easy to get you desired water temperature.
The weight and the dimension of this best electric water heater are 19 pounds and 21.7 X 20.1 X 9.6 inches respectively.
You get a 7 year warranty on the leakage and 3 year warranty on the parts as well.
This is the best rated electric tankless water heater that we recommend to everyone. As it works on electricity, it can be used everywhere you like, no need of finding propane of natural gas source anymore.
With a company that has 90 years of experience with water heater, we would say you are in good hands. You get a very highly rated water heater along with a very long warranty.
We are totally sure that you will love it!
Rheem RTEX-13 Tankless Water Heater review – cheap electric water heater
This is a classic professional electric water heater manufactured by Rheem company.
Foremost talking about its ratings, it has god, very good ratings on amazon by the customers who purchased it.
It is a very easily installable electric water heater. You can even replace your old ones and other parts very easily because of its simple constructions.
You get a display with LED screen on which you can adjust the water temperature by 1 degree Fahrenheit accuracy.
This electric tankless water heater also features self modulating technology which will decide and control the electricity input for water heating. Thereby saving you on electric bills.
The construction of this water heater is done with durable steel. The 2 heating elements are made out of cooper to make it last long and field serviceable.
You get a 99.8% energy efficient rating on this tankless water heater along with easily controllable external controls.
Talking about the flow rate, you will get approximately 1.5 gallon per minute of hot water, which is more than enough for 2 taps simultaneously.
To install this best tankless electric water heater, you will be provided with 3 feet electric cable, ½ NPT adapters and side ½ inch compression water connections.
The weight of this water heater is only 4 pounds and the dimensions are 4 X 9 X 13 inches.
The warranty that you will getting is of 5 years for heater chamber and 1 year for parts.
If you are looking for a relatively cheap electric water heater for your personal use then this is a very nice option.
You get a decent flow rate of 1.5 GPM which will be enough for a small household.
Furthermore, with its compact and lightweight design it allows you to place it anywhere you like. Check it out on amazon now to see the latest prices.
Eccotemp FVI-12 Electric Tankless water heater review – cheapest electric water heater on the list
If you want a very cheap and value for money electric tankless water heater then this is the best option out there.
This Eccotemp water heater runs on liquid propane and will require propane fuel source in order to heat up the water.
This is suited to people who have small houses with one or two bathrooms. This cheap electric tankless water heater will give you 3.5 gallons of hot water every minute. This water heater will activate only when you use water, thereby saving you electricity.
It is lightweight and compact; perfect for installation inside small houses and cabins with less space.
It will not make a lot of noise when operating and the big and clear display shows you the temperature values that are easy to read.
You will get a UL listed power cord which can connect to a 120V outlet, this is required for the safe electronic ignition system to fire up the water heater.
Furthermore, you can easily control the temperature with the controls.
It is very easy to install this water heater inside your house, you will need a water and fuel source to connect the ½ inch NPT.
When purchasing this tankless water heater, you will get a free digital thermostat, manual water controller, stainless steel horizontal vent kit, safety till switch, gas regulator, hose and many other accessories.
The overall size of this cheap electric tankless water heater is 28 X 17 X 10.5 inches and the weight is only 29 pounds.
You will get a 2 year warranty on this water heater when purchasing through amazon.
This is a no brainer!
If you want the cheapest tankless water heater then this is the only option. It is cheap but on the other hand it is made by a good company and with good quality. You get nice features and a 2 year warranty. Totally worth the money!
Ecosmart ECO 27 electric tankless water heater – Editor's choice
Ok let us tell you this right at the start – this Ecosmart water heater has been reviewed by more than 2000 people and they all gave it a rating of 4.1 out of 5.
That says a lot about the quality and efficiency of this water heater, right?
It’s a people’s favorite product!
We recommend this best electric tankless water heater to everyone who wants an electric heater. It is the EDITORS choice for electric water heaters!
You are never going to run out of hot water with Eco 27.
This water heater has a digital controller unit which is capable of temperature increments of 1 degree at a time. Which can be very helpful to set that perfect water temperature for you and your family.
The overall dimensions of this water heater are 17 X 17 X 3.625 inches. So, as you can tell it pretty small and compact, it will save 12 cubic feet of storage space for you.
It looks stylish and very pleasing to the eye.
Well this electric tankless water heater is designed with copper and stainless steel materials to give it durability, reliability and easy replacements.
As it works only when there is water flow, it will save you up to 50% on the energy bills.
Isn’t that awesome?
Note: please see if you have a 27kW, 240V, 200amps electrical outlet as it will need it.
This small tankless water heater will give you about 6 gallons of hot water every minute, which will be enough for a family. It can run 4 showers and a sink simultaneously.
As with most of electric water heater this one also has a self modulating technology which will further help you to save more power.
You get a limited lifetime warranty with this heater.
If you want to know more about the detailed specification, then please go here.
If you want the very best electric tankless water heater for yourself then there is no other option than this ecosmart eco 27.
It gives you a very long warranty along with a lot of hot water at a time. Enough for your whole family!
Stiebel Eltron Tempra 24 plus Electric tankless water heater review- Rated 4.5 by more than 500 customers
This electric tankless water heater is a size of a briefcase!
Small compact and lightweight makes it the perfect companion for small houses and cabins.
With 90 years of experience in water heater manufacturing, this German company is a really good choice for your hot water needs.
This electric tankless water heater has noiseless operation and it does not need any kind of venting at all.
It also saves energy!
Because there are no standby losses, this water heater only turns on when you need hot water resulting in power savings for you.
Well, the best thing about this tankless water heater is that when you have high demand, it will automatically adjust itself to provide you with the same temperature hot water, and will not give in cold bursts at all. This is done with the all new Advanced flow control.
Similar to other electric tankless water heaters, this one also has self modulating technology to save 99% power. You will get a flow rate of 0.5 GPM with this unit.
With the purchase, you get a 7 year warranty on leakage and 3 year warranty on the parts, isn’t that really awesome?
The power rating of this water heater is 24kW and the dimensions are 21.7 X 20.1 X 9.6 inches.
The weight of this water heater is only 16 pounds which makes it ideal for wall mounting or mounting under sinks and other tight places.
This is a decent manufacturer and will provide you with quality 100% of the time. They have a lot of experience in manufacturing these water heaters as well. If you need an electric heater and have a small house then this is the best choice as it is small and lightweight. Go for it and enjoy the hot showers!
That is it for the electric tankless water heater reviews, but if you are looking for natural gas or liquid propane tankless water heater then please carry on reading out next section.
Natural gas & Liquid propane tankless water heater reviews
If you are looking for some of the best Natural and Propane tankless water heater then you are at the right place!
Go ahead and do read the complete tankless water heater reviews right now!
Takagi T-K4-OS-NG Tankless water heater review – Highly rated Natural gas tankless water heater
This is an exceptional natural gas tankless water heater by Takagi.
This system can deliver on demand hot water and can be used in storage tanks, hydroponic systems, recirculation systems, domestic applications and radiant floor systems.
This is one of the best purchases you can do. You will get a 15 year limited warranty on the heat exchanger and 5 years warranty on residential use.
You will get a free remote control as well which will make your life easier.
You won’t need any kind of venting for this tankless water heater as this is an outdoor unit.
The power rating of this best natural gas tankless water heater is 190,000 BTU and will be able to provide you with non-stop 8 gallons of hot water every minute.
This flow rate is enough to provide hot water to 3 bathrooms at the same time.
The company has incorporated inlet and outlet thermistors in order to monitor the temperature constantly.
The weight of this tankless water heater is only 38 pounds. Thanks to the lightweight design and compact size, you can hand this unit easily on a wall.
This tankless water heater is rated 0.82 energy factor so it is very efficient as well as being environmentally friendly.
Like saving money?
Then you will love this feature! This water heater only burns gas when hot water is needed, which results in about 45% saving on monthly gas bill.
Other safety features include: troubleshooting diagnostic codes, overheat protections, surge protections and freeze protections.
The overall size of this natural tankless water heater is 20.3 X 13.8 X 8.5
To check out the full list of specifications please go to their official website.
If you are looking for a reliable and good outdoor heater then this is a very good choice for you. With no venting and various kinds of safety features, this water heater manages to climb in our top favorite water heaters list.
Long warranty, easy installation and money saving are the best feature of this water heater. Why not buy it now and enjoy unlimited supply of hot water?
Rheem RTG-84XLN Natural gas tankless water heater review – High volume tankless water heater
This is an outdoor only tankless water heater from RHEEM.
It has garnered 4.5/5 stars from 50 happy customers on amazon.
At about 35 degree F rise, you will get a 8.4 gallons of hot water per minute. This is more than enough to provide on demand unlimited hot water to 3 bathrooms simultaneously.
This is one of the highest volume tankless water heater out there. If you have got a big family in your house then this water heater will be enough to provide you all with hot water 24/7.
When you buy this Rheem tankless water heater, you get a free UMC-117 remote control with which you can remotely control the temperature levels. Also, you will get a 10 feet long thermostat wire with the purchase as well.
The best thing about this tankless water heater is that it is a LOW NOx variant, which is much more environmentally friendly then other similar water heaters on the market.
The space saving design will allow you to wall mount it easily in your garage or any other outdoor place. The BTU rating of this water heater is 11,000 to 180,000 max.
With the New Next Generation Burner technology, this water heater will save you money as well by efficient heating the water.
You will get a whopping 12 years of warranty with this best natural gas tankless water heater.
The overall weight and the dimensions of this water heater are 54 pounds and 14 X 10 X 26 inches respectively.
This natural tankless water heater is best suited to people who want their water heater to be fuelled by natural gas and want to keep it outside with no ventilation.
They give you long thermostat wire and a free remote control to change the temperature wirelessly. Go to amazon now to see the latest price of this water heater.
Rinnai RUR98iN Ultra series natural gas tankless water heater – High end tankless water heater
This tankless water heater from Rinnai is high end when it comes to its features and price.
This is the best indoor tankless water heater when it comes to providing a very high GPM rate.
This water heater is capable of delivering on demand unlimited supply of 9.8 gallons of hot water every single minute. That is really a lot of hot water if you ask us.
Best suited for big houses and multiple flat structure. It will easily provide hot water to 3 bathrooms and 2 taps simultaneously. If you live in very cold area then this capability may reduce a little bit. But undoubtedly 3-bathroom supply is certain.
The recirculation capability on this water heater will provide an endless supply of hot water regardless of whether there is a dedication recirculation line or not.
It is an indoor type installation system with a tankless rack system which is compatible with ½ inch natural gas lines.
You have to do venting with this water heater though. You can do either concentric of PVC type of venting. So, you got more choice there.
Rinnai’s own patented Condensing technology gives this water heater up to 0.96 energy factor rating. Along with that it also features dual exchangers which even further increase the efficiency of the water heater.
The size of this natural gas tankless water heater is 12.5 X 10 X 26 inches. And the weight is 93 pounds.
This massive tankless water heater is best suited to people who have many bathrooms and sinks in their house. It gives you a GPM of 9.8 which is very high for a small home.
Therefore, if you have very high hot water needs then this is the product to choose right now! Check out more information on amazon now.
Rheem RTGH-95DVLN & RTGH-95XLN tankless water heater – Top Direct Vent Water heater
This Rheem Natural gas tankless water heater has earned 4.3 stars out of 5 from more than 100 happy customers on amazon.
Rheem makes some of the very best tankless water heaters out there and this model is no less.
The energy factor rating on this natural gas water heater is 0.96 EF. This unit will save you a lot of money for sure.
What is best thing about this water heater?
Well, it saves you about 1,100 gallons of water per year with the help of exclusive water saving activation technology. This is done by reducing the flow rate of the water in pipes until the heaters set temperature is reached.
Rheem has the very best industry leading low flow activation in their water heaters. Even in low demands, you will definitely get that hot water.
The recirculation pump kit which comes with the product helps the water to circulate much faster before it loses its hotness, thereby saving up to 12,000 gallons of water per year.
Isn’t that really impressive?
Whenever you have back to back water needs, this unit will stay in ready fire state to prevent the cold water bursts.
Want to know a really cool thing?
This water heater can be easily controlled with the ECONET smartphone app, you just have to attach ECONET accessory kit to the water heater.
You will get a 9.5 GPM hot water rate with this natural gas best tankless water heater. In case you want to increase that then you can do so easily by attaching another unit with this unit.
You will also get a 12 year long warranty with this natural tankless water heater.
The overall dimensions and the weight of this water heater is 9.75 X 27.5 X 18.5 inches and 82 pounds respectively.
This is one of our favourite water heaters. It is best suited to people who want to hook up a few systems together for a building or a large house will more than 5 to 8 rooms. It will suit you really good as it has all the latest features and it also saves a lot of water from being wasted. Check it out on amazon now.
You can also get the same model in ultra low NOx variant as well, checkout the link below.
Takagi T-KJr2-IN-NG Natural gas tankless water heater review – Cheap and high-volume water heater
First things first, this natural gas tankless water heater has received very high rating by its customers which indicated that it indeed is a very good product.
With power of 140,000 BTU this water heater gives out a massive 6.6 gallons per minute of unlimited on demand hot water.
That much hot water is more than enough for 3 bathrooms and 2 sinks running together.
You will need to call in a professional to get it installed as it will need a 4 inch category III stainless steel venting.
Although its an indoor unit but you can convert it into an outdoor direct vent unit as well.
This cost efficient and environmentally friendly tankless water heater give you an energy factor of 0.82 which is enough to save a lot of power.
The overall dimensions of this natural gas water heater are 20.3 X 13.8 X 6.7 inches and the weight is only 38 pounds.
This is the smallest water heater by TAKAGI manufacturer and is best suited for small to medium sized homes and apartments.
Other accessories include a set of outlet and inlet thermistors for constant temperature monitoring.
If you have a small home with 2 or 3 bathrooms and hot water taps then this is ideal choice if you are going with natural gas water heater. It is cheap and manufactured by TAKAGI which is a trustworthy company. Backed by the customer ratings this unit is really worth the money.
Eccotemp L10 Outdoor tankless water heater – Best for camping and Portable
Do you go out camping much?
Then this is the only thing you need to see and buy right now!
This is an outdoor liquid propane tankless water heater made for those of you who wander around outside.
It is very easy to carry, also, it is lightweight: only 27 pounds. It is also very small and compact; the dimension of the water heater are 25.5 X 13.6 X 7 inches.
Eccotemp has been making water heater since 2004, therefore they have a lot of experience under their belt!
You will get a removable weather proof cap on the top, manual temperature controlling knobs and 1 adjustable water pressure gauge.
You can use it anywhere you like, you will only need propane tank with you. Any standard 20 pounds propane tank will do. The liquid propane is ignited with two D cell batteries, so no more waiting around.
You can connect it to any standard hose and it will work, thanks to its low pressure activation of only 20 PSI.
Well, the best feature we think is the auto shutoff! If you tilt the liquid propane tankless water heater more than 45 degrees or if the water heater has been running from 20 minutes, it will shut itself off automatically to ensure safety.
The manufacturer has already tested it at an elevation of 5,500 feet, and it works fine. It provides you with a hot water flow rate of 2.6 GPM.
With easy installation and shower compatible design, it is the best choice for camping or putting it inside motor homes.
You will get free Regulator, rain cap and other installation accessories. The total warranty on it is 1 year.
So, this is a very obvious choice for campers and RVs. This is the only portable propane tankless water heater on the out list which is nice, efficient and reliable. Buy this if you want your water heater to come with you on adventures. It will make your life very easier by providing hot water wherever and whenever you want!
Wrapping it up!
Well you can choose any of the above tankless water heaters, they are all very good and have nice ratings on amazon.
But just in case you are still confuse we would like to recommend some of them to you.
BEST ELECTRIC tankless water heater?
If you want an electric tankless water heater then there is a clear winner - Ecosmart ECO 27. It provides you with a lot of features and a very long warranty period. It is tested out by many people out there already so it’s safe to buy. You won’t face any problems!
Best Natural gas tankless water heater?
Rheem RTGH-95DVLN & RTGH-95XLN tankless water heaters are the best choice if you have a natural gas connection at home. They come in different models as well to help you find the one that suits you the best. They even have long warranty periods so you can be stress free when using it. Check them out today!
Best Portable tankless water heater?
This one is our favourite just because you can take it anywhere and enjoy the hot showers. You can even install this inside your RV or camping van, as it is compatible with shower heads. It gives out a lot of hot water and also has nice safety features. But it for you next outdoor adventure!
We hope we have helped you in choosing the right and the best tankless water heater for yourself. We welcome you to check out other reviews on our website as well.