Best Tankless Water Heaters – A Complete Guide
Tired of running out of hot water? Or dealing with a bulky, energy-draining water heater? A tankless water heater might be exactly what you need. These compact, energy-efficient units heat water only when you need it, so you’re not wasting energy (or money) keeping a full tank hot all day.
These water heaters became the town’s talk by helping you save an enormous electricity bill. Some of the best tankless water heating units not only enable you to cut back on your bank account but also help you conserve energy at your home.
Some of the best tankless water heating units do not just enable you cutting back on your bank account but they also help you in conserving energy at you home. These units do not just constantly heat the water as traditional geezers do instead; they let you have a hot water supply when you need to most instantly.
Furthermore, these modern water heating units are extremely affordable, convenient to use and they also help you saving up some extra space at your home. You do not need to bring in that large geezer at your home anymore because of the intervention by water heaters.
Now, the question is, where will you find the right water heating units and how will you know which products to choose?
The answer to your “how” is at the end of this article so we may suggest that you should read it till the end to know more about the subject and how some of our tips can help you utilize the product in the best way possible.
As for where and which, following are a few recommendations regarding some of the best tankless water heaters. We understand how finding the right product can be a painful process which is why we ensured to make a list of all the products available in the market worthy of your attention.
Take a look at some of the most recommended tankless water heater brands and find out for yourself regarding which unit fulfills most of your requirements.
1. EcoSmart ECO 11 Electric Tankless Water
Our very first recommendation with regards to best tankless water heater is a product from EcoSmart that is known as Eco 11 Electric Tankless Heater.
The Eco 11 is an electric power heating unit which means that it doesn’t require gas or flames for functioning. It is also among the best electric tankless water heaters that you will find in the market. Since the unit doesn’t require any ventilation system, the installation process is pretty easy and won’t cost a leg or an arm.
Once the water has been heated up, it can then be transferred to several pipes simultaneously and almost your entire family can make use of it. This is also one of those under sink tankless water heaters that will not take any of your space.
The water heater comes with a digital temperature control system that will allow the user to manage the temperature according to his/her own requirements. The controls have been specifically designed to give the entire control to the user over the unit and provide consistency in producing water.
Before we dive into some of the major details of ECO 11, let’s take a look at some of its major features,
- It runs on electricity and doesn’t require any burners
- It is a highly compact unit that you can place anywhere inside your home
- The installation is simple and inexpensive
- It can heat up water to 105 °F almost instantly
As far as the installation is concerned, in order to install ECO 11, all you need is 60 amp power supply and a No.6 copper gauge wire. The unit also comes with an adjustable and resetable thermostat. The water heater is capable of setting the initial temperature automatically and that makes it very easy to use.
Another thing that is worth mentioning about this water heater is that it comes with a lifetime warranty. EcoSmart is reputed for providing its customers with lifetime warranties with all their products and ECO 11 is another smart choice in regards to that.
The one thing that we totally loved about this product is that it is so compact that you can just put it anywhere inside your home. The Eco 11 is one of the most favorite electric heaters that you will find in the market not to mention this is a cheap electric hot water heater that will prove its worth to you for sure.
- It comes in a very affordable price
- It is in a highly compact size
- Energy efficientThe unit can heat up to 2 gallons
2. Stiebel Eltron Tankless Water Heater
Stiebel Eltron electric tankless water heater is designed to deliver continuous hot water without wasting energy. This eco-friendly and space-saving unit provides an endless hot water supply for your home while maintaining silent operation.
Whether you want a hot shower on demand, a reliable system for multiple fixtures, or an energy-efficient solution to reduce utility bills, this model checks all the boxes.
Some electric tankless water heaters can be noisy or inconsistent in temperature regulation, but Stiebel Eltron’s advanced auto-modulation technology ensures a steady, comfortable water temperature without loud operation.
Unlike traditional water heaters that store hot water, the Tempra 24 Trend heats water only when needed, reducing standby energy loss. It’s also sleek and compact, perfect for homes with limited space.
The 24 Plus Tempra comes with the following features. Take a look at them and then we will discuss everything in detail,
- Continuous hot water ensures no interruptions, no waiting
- Energy-efficient design that auto-modulated to save electricity
- Silent operation guarantees no annoying noise while in use
- Digital temperature display and easy-to-read control panel
- Compact & space-saving, so no venting is required
- A durable copper heating system that ensures longevity
This best indoor tankless unit runs at 24kW (240V) and requires 150A minimum electrical service, making it ideal for mid-sized homes. It delivers an output temperature ranging from 68°F to 140°F, ensuring hot water exactly when needed.
For added peace of mind, it offers a 7-year warranty against leakage and a 3-year warranty on parts, showcasing its commitment to quality and durability.
If you want a powerful, efficient, and space-saving tankless water heater, the Stiebel Eltron Tempra 24 Trend is undoubtedly an excellent investment. It’s perfect for homeowners looking to cut energy costs while enjoying endless hot water on demand.
- Requires hardwiring so professional installation recommended
- Needs a high-amperage electrical service (150A minimum)
3. Ecosmart ECO 24 24 KW Tankless Water Heater
Tired of dealing with bulky traditional water heaters that take up space and pose a flooding risk? Then, it’s time to go with Ecosmart ECO 24 tankless. EcoSmart has undoubtedly stood out from many options in terms of performance, efficiency, and price.
It is best suited for a home having two bathrooms, a kitchen, laundry, and 3 to 5 people. While installation is damn easy for a plumber, and there is no actual expense required for upgrading this electrical system. The long-term savings and benefits made it worth it.
Switching to the EcoSmart ECO 24 will surely be one of the best home upgrades. It delivers endless hot water, saves space, and eliminates the worry of leaks. While the electrical setup required an investment, the long-term benefits of efficiency, convenience, and peace of mind far outweigh the costs.
If you’re considering going tankless, this is a solid choice.
The Ecosmart ECO 24 Tankless Heater has some of the following features and later we have described everything in detail.
- Its compact design frees up valuable storage space
- It is an efficient model with 99.8% efficiency, reducing energy bills
- It has self-modulating technology that adjusts power to demand
- Digital display for precise temperature control
- Built durably with copper and stainless steel components for longevity
- No bulky tank, more room for shelves
- Instant Hot Water
- Long, Comfortable Showers
- No fear of running out of hot water
- Uses power only when needed, lowering utility costs
- No More Flooding Risks
- Upfront Electrical Costs (May require a panel upgrade, depending on your home)
- Colder Climates May Experience Slight Delays (If your pipes are in a cold area, it might take a little longer for hot water to reach the tap)
4. Camplux 5L Portable Outdoor Tankless Propane Water Heater
Since we are recommending outdoor portable water heaters, it is fair that we add recommend a propane instant water heater to the list to make things easier for you. The Camplux 5L is also among the best propane tankless water heaters you will find in the market.
Whether we are giving a shower to our pets in the garden or having a water fight with our best friends or we just want to relax ourselves at the end of the week with a hot shower, all of this can be achieved by having a portable water heater, one that is highly functional.
Lucky for you, Camplux 5L is something of extreme value to all of those people who are hunting down a water tankless heater for the above mentioned things.
Some users face problems with portable units because most of them run through electricity but not with this one. The Camplux 5L is powered by propane and it runs through 2D cell batteries so electricity or not, you will always have hot water at your service no matter where on earth you are.
Some of the major features that Camplux 5L possesses have been mentioned below,
- It is a portable water heater that has been powered by propane
- You do not need electricity to run it since it requires 2D cell batteries for power
- It can work with only 2.5 PSI of water pressure so that is something you do not really need to worry about
- It is also capable of working with 12V water pumps
The unit has been designed to be carried around so it is very lightweight and compact. It weighs only 10.4lbs which ensures it will not be a problem for you to burden yourself with. You can easily fit this into the trunk of your car because of its compact size and take it on longer journeys with you.
For all the people who love travelling, the Camplux 5L is a lifesaver. It isn’t just compact and performance-efficient which makes it worth it but it is highly reasonable as well when it comes to the price. So, if you want a durable water heater, then Camplux 5l is the answer to all your prayers. The company also offers great tankless water heater service if you need it afterwards.
- You will have to buy the 2D batteries separately
- You must remove the batteries from the heater while travelling or they might spark
5. Girard 2GWHAM On-Demand Tankless Water Heater
The 2GWHAM is among the latest offerings launched by Girard.
The company is among the strongly established RV tankless water heater manufacturers in the world. The unit is capable of keeping the hot water to your desired temperature and it can be very useful for your recreational vehicle or motor home.
Girard is reputed for manufacturing products of top-notch quality. Their loyal customers have always rooted for their services and their customer-service is spoken for.
Since most of the previous hot water heaters lacked the ability of monitoring the temperature of the incoming water, Girard made sure that this piece of technology will be an advanced water heater and also one of the best electric tankless water heaters to be found in the market.. The unit has been designed by on-board microprocessors which will track the temperature of the incoming water.
Before we indulge into the details and specifications of 2GWHAM, here are some of its most prominent features,
- The unit works with 42,000 BTUs and provides optimal performance
- It is ideal for winter use
- The unit doesn’t require any specific installation requirements
- It comes with a brushless motor and the operationalization is extremely quiet
With the help of this feature, you can always ensure that you will have a constant flow of hot water at your ease. This unit is designed with a good burner regulating capacity, which is able to keep the flow of hot water.
One of the things that stress out people the most is knowing there will be no hot water available in the winters. Well, this is where Girard 2GWHAM comes into play. It will provide consistent flow of hot water even when the temperature is freezing.
The unit works with 12 volts of power and consumes energy less than three amps which means it just doesn’t take up less space but also consumes less amount of energy. The 2GWHAM is a highly efficient water heating unit that is going to benefit you in a lot of ways.
When it comes to installing tankless water heaters for RV, the Girard 2GWHAM is among the favorites. The design is really compact, it is lightweight and the installation is pretty easy as well. In addition, this is a cheap electric hot water heater so that adds to the benefits of buying the 2GWHAM by Girard.
- The 2GWHAM is quite expensive as compared to other products
6. Rheem RTEX-24 24kW 240V
After plenty of research, we picked Rheem RTEX in our top 12 list as the best electric tankless heater. It’s super easy to install the unit; once everything is set up the heater works flawlessly.
This model delivers consistent hot water on demand, and users never found an issue with fluctuating temperatures. The digital temperature control makes it easy to adjust, and the self-modulating power ensures energy savings without sacrificing performance.
The Rheem RTEX-24 is an excellent tankless water heater that combines power, efficiency, and space-saving design. It’s an ideal solution for medium-sized households upgrading to on-demand hot water without the hassle of a traditional tank. If you’re ready to invest in an energy-saving system, this one is worth considering!
A few prominent features of Rheem RTEX-24 have been mentioned below,
- Compact, space-saving unit with a stylish digital display.
- Provides on-demand heating with no temperature fluctuations.
- Self-modulating technology optimizes power usage, reducing energy bills.
- Handles multiple fixtures at once without a pressure drop.
- It has a simple digital interface for precise temperature adjustments.
The Rheem RTEX-24 is an excellent tankless water heater that combines power, efficiency, and space-saving design. It’s an ideal solution for medium-sized households upgrading to on-demand hot water without the hassle of a traditional tank. If you’re ready to invest in an energy-saving system, this one is worth considering!
- Upfront cost – While it saves money in the long run, the installation costs (especially electrical work) can add up
- If you live in an area with freezing winters, the flow rate might drop slightly.
7. Rinnai V Series HE Tankless Hot Water Heater
As we move on to our next recommendation, let’s talk about the Rinnai V Series HE Tankless Water Heater. Rinnai, a company that grew popularity among homeowners because of their economic models and great efficiency is one of the fan favorite brands among customers. We read a few Rinnai tankless water heater review and that really intrigued us to dig deeper and that’s when found this water heating unit for you.
When Rinnai launched their V Series Wat, they introduced a number of models to their customers. All of these models only had minor differences among them whereas the base quality was the same. Rinnai tankless water heater reviews are generally in favor of the company, let’s find out why.
The Rinnai propane tankless water heater was designed to satisfy the needs of those living in residential areas and it is by far the best tankless hot water heaters you will ever find. The power consumption of V Series HE is very minimal and it is not going to cost you a lot. If you happen to be someone who wants to replace his previous gas tank water heater, then you have a winner here.
So, the product that we have picked out for you is the HE Tankless Hot Heater. Before discussing all the details, let’s see what this model has in store for you with regards to its major features,
- This is a non-condensing water heater that is designed for residential usage
- The model is designed exclusively for budget oriented families so the price will not be an issue
- It can provide an endless stream of hot water with a maximum temperature of 140 degrees Fahrenheit
- The model is Wi-Fi enabled so you can control it remotely
- It comes in a very small and convenient size and can be installed easily
Even though this is a very small unit, it has the capability of providing an endless stream of hot water. Whether it is winter or summer, you will be having an endless supply of hot water if you do end up with this water heater.
For added features, the unit comes equipped with Wi-Fi that will allow you to control the temperature of water no matter where you are. The size of V Series HE is also quite compact and you will be able to mount this on your wall and end up saving a lot of space in the process.
So, all in all, the Rinnai propane tankless water heater are is another product that is recommended for those who are looking for budget oriented purchase.
- Some users have reported that the heater took longer to heat up the water
8. EcoSmart ECO 27 Electric Tankless Water Heater
If you are looking for an electric tankless heater that can serve you on a regular basis then going for this one is a great idea. This EcoSmart tankless water heater has been created with cost-effectiveness as its main feature. It can easily serve all your water related needs even if you need warm water in higher amounts at your place.
This heater has been made using low heating cost technology and yet heats an unlimited amount of water quickly. This quality makes it a great option for large families too, without having them spend too much.
The heater has a copper and stainless steel build, which helps it heat up the water way quicker as compared to other such heaters. Such a build also keeps the heater free of rust so that it can last you over years.
Before going on any further, here’s a summary of its most enticing features:
- Patented self-modulating feature
- Digital temperature control assisted
- Stainless steel and copper body
- Unlimited water supply
- Easy installation
If you choose the right size of this product, there are solid chances that your home won’t run out of hot water again. The body has been designed compactly, to make sure that this heater takes up little space in your home. You will notice an obvious reduction in your overall costs after you replace your traditional water heaters with this one.Made with the latest technology, this heater has a self-modulation capability that allows savings on the cost of electricity. The best part is that this cost-effectiveness does not come with the product having any other flawed points. You won’t need to compromise on the warmth of water or the time taken by the water to be warmed up just because this product is using less energy.
- Delayed start up when used after a long time
- Some safety hazards
- Water dribbles and leaks sometimes
9. Westinghouse 18kW 240V Tankless Water Heater
The Westinghouse APOLO-18kW is another solid choice to buy when it comes to compact, innovative, and efficient tankless water heaters. With Wi-Fi control, self-modulating technology, and safety features, it delivers reliable hot water while keeping energy consumption in check.
One of the unique features is its Wi-Fi connectivity, allowing you to adjust the temperature remotely, perfect if you want to tweak settings without going to the unit.
You can also control the temperature using the rotary dial, with precise 1° increments from 86°F to 140°F. The instant heating ensures no waiting time, and the 4.2 GPM flow rate is ideal for tiny to medium-sized homes with 3-4 usage point.
We fell in love with its features and which is why we are penning them down below,
- Its Wi-Fi Connectivity feature helps you adjust temperature remotely for added convenience.
- Instant Hot Water provides on-demand heating with no waiting time.
- 4.2 GPM Flow Rate is ideal for small- to medium-sized homes (3-4 usage points).
- Self-modulating technology can adjust power usage based on demand, improving energy efficiency.
- Wall-mounted design, perfect for tight spaces.
- Precise Temperature Control (Rotary dial allows 1° increments (86°F – 140°F)).
The compact design makes it easy to mount, but like most high-powered tankless units, it requires two 40 AMP breakers and 8 AWG wiring, so professional installation is recommended. If upgrading from a traditional water heater, check your home’s electrical capacity first.
The Westinghouse APOLO-18kW is an excellent option for modern, tech-savvy homeowners who want a compact, innovative, and efficient water heating solution. If you’re looking for a reliable tankless heater that saves space and offers remote control convenience, this one is worth considering!
- Requires electrical upgrades
- Not ideal for large households
10. Rheem RTEX-18 Electric Tankless Water Heater
Looking for an efficient heating solution for a very small space? Then this cost-efficient and space saving electric tankless water heater from Rheem should be your first choice. This heater has a brass and rugged copper heat exchanger which is strong enough to withstand harsh weather conditions without affecting its heating capabilities. This means you can hang this small heater anywhere without caring much about the external conditions affecting it there.
On an average, the small heater can go perfect with your small apartments and single rooms of hotels or hospitals where it can easily provide warm water for 1-2 washrooms.
The best part about this heater is its design which is compact and solid enough to last you longer. The body of this product is slim and compact enough to be easily fitted even in a small corner of your room. Also, the installation and setup process of this slim water heater is so easy that anyone with a little know-how of the things can fix it anywhere.
Some amazing features of this tankless water heater include:
- On-demand working for lowest possible energy consumption
- On-unit temperature controller
- Rugged heat exchanger for long lasting working
- LED indicators
- Compact and lightweight design, made to last long
This heater can easily provide consistently heated water at around 3.51-4.4 GMP of pressure. Overall, this heater is all that a single person or a couple sharing an apartment can ask for. It is cost-efficient and long lasting and caters to all your warm water related needs.
- Insufficient warranty
- A little fluctuation in voltage can ruin its functioning
- Not suitable for two people in a very cold weather
11. CAMPLUX 4.22 GPM Tankless Water Heater Gas
Looking for a powerful, propane-powered tankless water heater? The CAMPLUX CX422 is an excellent choice for compact homes, mobile homes, and apartments. With 102,000 BTU heating power, precise temperature control, and anti-freeze protection, this unit delivers consistent hot water on demand for 2-3 usage points.
The 4.22 GPM flow rate ensures a steady hot water supply, while its smart chip technology maintains the temperature within ±1°F, eliminating annoying fluctuations. Unlike traditional water heaters, this unit doesn’t store water, meaning you get instant hot water without waiting.
Built with stainless steel and copper components, the CAMPLUX CX422 is designed for longevity and efficiency. Safety is a priority, with overheating protection, anti-freezing protection, and low water flow protection, making it reliable even in colder climates. The anti-freeze feature activates at 39°F to prevent internal components from freezing.
This unit is UL-approved and complies with national safety standards. It requires a standard gas regulator and a 3-inch vent pipe, which may need to be purchased separately. If you’re using a 20 lb propane tank, you’ll need a 1/2″ NPT Female to 3/8″ Male adaptor for proper connection.
The CAMPLUX CX422 is an excellent choice for homeowners who need a compact, propane-powered tankless water heater with consistent performance and safety features. If you want instant hot water without taking up much space, this model delivers great value for its price.
Let’s take a look at some of the prominent features of CAMPLUX 4.22 GPM before we take a further dive into the details,
- 102,000 BTU high heating power ensures fast and efficient water heating.
- Innovative chip technology keeps the temperature within ±1°F.
- Energy-Saving Propane System
- Anti-Freeze & Overheat Protection that automatically prevents freezing and overheating.
- Compact & Space-Saving that makes it the perfect choice for tiny homes, apartments, and mobile homes.
- Requires venting – Needs a 3-inch stainless steel vent pipe (sold separately)
- Professional installation recommended – May require extra components.
12. Gasland BE158B 1.58GPM 6L Outdoor Portable Gas Water Heater
As for our last recommendation in this list, we have Gasland BE158B for you.
Gasland is among the best companies that you could consider for buying tankless heaters and as we have made a recommendation from this company before, we found another heater that you are really going to like.
There are many things that you need to know about this water heater before you can decide if you would want to purchase it or not.
If you want a portable water heater that you can take along on outdoor trips, then Gasland BE158B is a good option because it offers you a water capacity of 6-litres which is quite enough for taking a shower or washing dishes.
So, without further ado, let’s take a look at some of its major features and then we will move further with the details,
- The water capacity of this heater is 6-litres which is quite a lot for a portable heater
- This is a high quality heater because it is made up of copper and steel
- It is a compact and lightweight heater so you can carry it easily
- There are no fuss and struggles involved as far as installation is concerned
You also do not need to hire a professional for the installation process. The unit comes with a detailed instruction manual and you can easily install it all by yourself. You also do not need high water pressure to use this heater because it has specific settings that allows the user to obtain heated water from it even on lower water pressure.
This unit utilizes propane gas and is using Lithium Ion 2 D batteries. This will also allow you to save money on electricity bills and make use of this heater on the go. This is a propane instant water heater that will just make it easier for you to attain hot water within minutes.
- The batteries are not included in the package and you will have to purchase them separately
Our Pick: Recommended Tankless Water Heater
If you have made it this far, you have read all about our products and why we recommended them. But now that you are here, you want to know which product is our favorite and why.
The EcoSmart ECO 11 is our top recommendation for one key reason: it perfectly balances affordability, energy efficiency, and performance. If you’re looking for a reliable electric tankless water heater that delivers instant hot water while keeping your electricity bills low, this is the one to get. It’s also one of the best-selling models, trusted by thousands of homeowners.
What makes the ECO 11 a wise investment? First, its compact size makes it ideal for homes with limited space. You can install it under a sink, in a bathroom, or even in a small utility room—without sacrificing valuable square footage. Unlike bulky traditional heaters, this sleek, wall-mounted unit stays out of the way while providing endless hot water on demand.
Another significant advantage is energy efficiency. Since it heats water only when needed, it doesn’t waste energy, keeping a full tank hot 24/7. This on-demand heating system can significantly reduce your monthly power bills, making it a cost-effective choice in the long run. Plus, the digital temperature control gives you full control over water temperature, ensuring comfort and consistency every time you turn on the tap.
Durability is also a key factor in choosing ECO 11. Backed by a lifetime warranty, this unit is built to last—provided a professional installs it. That peace of mind, combined with its strong performance and user-friendly design, makes it an easy pick as our Editor’s Choice for the best tankless water heater.
Best Tankless Water Heater – Buyer’s Guide
As you have read our entire research by now, you must have decided for yourself that which unit you will be opting for.
But one thing that must have crossed your mind, how did we choose all these heaters and what are the things you must keep in mind when making a selection for yourself.
Well, in that case, our buyers guide is going to help you out thoroughly. Just take a look at the following tips and keep them in mind before choosing a water heater.
Flow rating
The flow rate indicates how much water the heater will be able to heat as the water enters your home. This will also depend on how much water you generally require and how many people will the heater be serving.
You should talk to a professional about this and ask them what it will mean to you for with regards to where you live.
Energy ratings
Almost every electrical appliance that you want to buy has an energy rating and tankless water heaters are just the same.
Known as the (EF) rating, the energy factor is a rate determined by how much a single unit of fuel is used to heat a specific amount of water. The higher that number is, the more efficient tankless water heater will be.
Size of the system
Once you know the flow and energy rating, you will need to figure out what size tankless water do I need?
This also depends on the number of family members you have and how much water you will be needing each day. So, go for a larger capacity if you have a bigger family and you consistently need water.
Another thing that must arise in your mind is the question how much does a tankless water heater costs? Well, there are different price ranges in that regard and you will have to survey through the market in order to know the answer to that. And that is where our entire research comes into play.
These are things that you must keep in mind along with the price of the heater according to your budget when selecting a tankless water heater. Because if you do, you will never regret your purchase.
Advantages and Disadvantages of a Tankless Water Heater
No matter how hard you try, you can’t get your hands on a tankless heater that is fully perfect. Like every other product, these tankless heaters also come with some advantages and a few drawbacks. Here are the top most benefits and a few bad points about having a tankless heater at your place:
The Goods:
- Because they only heat the water when necessary, these heaters are a very good source of water conservation
- They are super cost-effective and don’t put too much load on your electricity or gas bills
- On an average, these heaters have a longer lifespan as compared to conventional heaters
- They take up a very little space in your homes
- You can easily set these up anywhere you want
- Usually, you have a limitless supply of warm water only if you don’t overuse the water
The Bads:
- Initially, these heaters may cost you a lot more as compared to the conventional units
- The cost of getting these installed is quite higher even when the setup process is not too hard
- These heaters won’t really suit bigger households with warm water needed in multiple taps in large quantity
Some FAQs About Tankless Water Heaters
In the light of our research, we are answering some frequently asked questions down below, take a look for a better understanding.
Conclusion
We have to say that searching for best tankless water heaters wasn’t an easy thing to do. Apart from taking a look at different brands of water heaters and comparing their features, we also had to compare their pros and cons.
However, as our above mentioned research will suggest, our entire working experience remained very fruitful. We did our best and found the most accommodating water heaters. Now the entire thing is up to you, read the specs, compare features and decide for yourself that which water heater will prove to be of value for you.
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