Tankless water heaters are one of the most essential and useful home appliances that everybody should install in their homes, as they not only save you money but also allow you to take out as much hot water as you need, continuously.
With that said, if you are interested in buying one, we have shortlisted some of the best tankless water heaters for you in this article. But, before you decide to buy one, make sure to check for a few things like:
- Fuel Type: Tankless water heaters come in various different types. While the electric tankless water heaters are the most popular ones out there, you can also find water heaters that use Propane (LPG) or Natural Gas (Methane) as the fuel. Out of these two, natural gas water heaters are more cost-effective.
- Max Power Output: If you consider an electric water heater, the max power output for that will be mentioned in Watts. On the other hand, max power output for gas water heaters is measured in BTU/Hr. In both cases, the more powerful the water heater is, the faster it will be able to heat water.
- Water Flow Rate: Apart from picking a powerful water heater, don’t forget to check the water flow rate at which the heater can efficiently work. Usually, for residential use, a water heater with 5-10 GPM (gallons per minute) water flow is good enough so that you can use multiple faucets, and showers at the same time.
For more knowledge about tankless water heaters, we have also included a small and detailed buying guide in this article below. If you need assistance while choosing a suitable tankless water heater option for your home, the “Buying Guide” has enough information so you can pick an option wisely. Until then, let’s take a quick look at the list and help you find a good water heater.
Best Tankless Water Heater
Best Tankless Water Heater Reviews
EcoSmart ECO 11: a compact electric water heater designed for smaller spaces like bathrooms, small sinks, and offices. It provides instant hot water, energy efficiency, and space-saving benefits. The ECO 11 heats water as needed, avoiding hot water shortages.
Its efficiency can lead to energy bill savings, and it’s easy to install and heats water quickly. The unit’s compact size takes up less space compared to traditional tank water heaters. When choosing a water heater, consider factors like your home size, location, energy costs, and priorities.
- Max power output of 13kW
- Delivers hot water at 1.3-3.1 GPM
- Uses self-modulation technology for energy saving
- Highly thermal efficient water heater
- Satisfactory water flow rate
- Comes with a lifetime warranty
- Not ideal for 120V supply
EcoSmart Tankless Water Heater – a modern solution for uninterrupted hot water. No more waiting for your shower to heat up! This intelligent system adapts to use energy only when needed, cutting your water heating bills by up to 60%. It’s compact, saving you a lot of space compared to traditional water tanks. You can easily set your preferred water temperature using user-friendly digital controls.
Plus, it’s backed by a lifetime warranty for residential use. Holding 5 gallons of water and compatible with AC/DC power, the EcoSmart Tankless Water Heater offers continuous hot water without taking up much room. Stay comfortable and save money with this efficient water heating option.
- Max power output of 18kW
- Delivers hot water at 1.8-4.3 GPM
- Uses self-modulation technology for energy saving
- Highly power-efficient
- Adjustable temperature control
- Comes with a lifetime warranty
- Takes a while to supply hot water at the beginning
Camplux AY132 Portable Propane Water Heater is an advanced solution for your mobile hot water needs. Designed for ease of use and transport, this model operates with the power of two D batteries, ensuring convenience on the go. Capable of delivering up to 1.32 gallons of hot water per minute, it covers a temperature range of 50-140 degrees Fahrenheit, catering to various preferences.
Safety is paramount, and the AY132 takes it seriously. With a comprehensive 6-in-1 protection system encompassing anti-freezing, over-heating, low water flow, dry combustion, high water pressure, and flame failure safeguards, your peace of mind is guaranteed.
With a 5-liter capacity, water flow adjustable, and suitable for water pressure between 3 and 130 PSI, the Camplux AY132 exemplifies portable efficiency and safety. Whether camping, hiking, or in need of hot water outdoors, it’s your reliable companion for a warm and worry-free experience.
- Max power output of 34000 BTUs/Hr
- Delivers hot water at 1.38 GPM
- 6-in-1 protection system for security.
- Adjustable water output rate.
- Quick installation and operation.
- Ideal for camping, hiking, and outdoor use.
- 5-liter size may not suit larger groups.
Stiebel Eltron is yet another well-reputed brand in the market that makes really high-quality electric water heater models, especially tankless ones.
Speaking about its specifications, this water heater is capable of delivering a max power output of 14.4kW which is decent enough to provide you with hot water on-demand. Moreover, it works on a 240V supply and requires a minimum of 100 Amperage to function properly. The water heater is extremely reliable and effectively heats up water for you, thanks to the interior solid copper heating system that handles the job pretty well, and doesn’t even make much noise while operating.
In fact, the heater is pretty compact and sleek and does not even require any venting, so the installation is quite simple. The best part about this water heater is that it can automatically control and reduce the flow of water if the demand exceeds the capacity to always maintain the temperature at a certain level. Moreover, the max water flow rate offered by this water heater is about 3 GPM, which is decent enough if you have a small family.
- Max power output of 14.4kW
- Delivers hot water at 3 GPM
- Advanced Flow Control technology
- Energy-saving water heater
- Small and compact
- Comes with pre-set temperature buttons
ECOTOUCH 5.5KW tankless water heater – the epitome of convenience and comfort. With this innovative brand, you can revel in instant hot water, flowing at 1-1.5 gallons per minute, perfect for rapid tasks like handwashing. The brilliance lies in its smart technology, adjusting power based on your water preferences, ensuring energy efficiency while safeguarding against scalding.
Its sleek black design adds style and function, and it’s easy to mount on the wall, saving space and making setup simple. With a power of 5.5KW and voltage of 240V, it’s designed for performance. The heater activates with a minimum flow of 0.475GMP and can raise the temperature from 67°F to 109°F at 1.2GPM. Trust the ECOTOUCH 5.5KW tankless water heater to redefine convenience and efficiency in your daily routine.
- Max power output of 5KW
- Delivers hot water at 475GMP
- Adjusts power for energy savings and scalding prevention.
- Modern design enhances decor.
- Ideal for smaller living spaces.
Saves energy, prevents scalding.
Rheem 18 kW tankless electric water heater is a smart solution for instant hot water! It’s incredibly powerful, heating water at a rate of 4.4 gallons per minute, ensuring a constant supply. Plus, it’s budget-friendly, cutting water heating costs by up to 50%.
Built to last with sturdy copper heating elements, it’s durable and doesn’t require vents for installation. You’re in control with its user-friendly digital temperature settings and LED display. This heater heats water only when needed, using less energy compared to regular heaters, which also helps in reducing water wastage.
It fits neatly near sinks or showers and performs exceptionally well in warmer areas, providing a substantial 5.9 gallons of hot water per minute. Models above 6 kW are even more efficient, adjusting energy use.
- Max power output of 18kW
- Delivers hot water at 4.4 GPM
- Uses self-modulation technology
- Has digital thermostatic control
- Easy to install
- Decent power output
- Takes time if the inlet water is too cold
Rinnai V94XiN Tankless Water Heater is designed for consistent hot water supply. Its compact build ensures easy installation, although professional setup is recommended.
Operating efficiently, the V94XiN heats water on demand, saving energy and costs. With a hot water flow rate of up to 9.8 gallons per minute, it suits various household needs.Featuring built-in scale detection technology, maintenance is minimized, and a comprehensive warranty covers 10 years for the heat exchanger, 5 years for parts, and 1 year for labor.
- Max power output of 150000 BTUs per hour
- Delivers hot water at 6.3 GPM
- Comes with a gas leak detection feature
- Power output is very good
- Ideal for families up to 6 members
- Comes with a 10-year warranty for the heat exchanger
GASLAND 6L Tankless Water Heater – a smart solution for hot water needs. It’s super powerful, heating up to 109.4℉ quickly and giving you 1.58 gallons of hot water per minute, even with low pressure. You can use a regular propane tank and battery ignition for camping or home use. It’s really safe with certifications and protection features like preventing overheating, low water flow, and freezing. The digital screen makes it easy to control the temperature, and you get a 1-year warranty. The package includes the heater, regulator, shower head, and more. Stay warm and worry-free with GASLAND.
- Max power output of 41000 BTUs/Hr
- Delivers hot water at 1.58 GPM
- Uses advanced combustion technology for quiet operation
- Good for outdoor use
- Lightweight and easy to carry
- Heat and water flow is fully adjustable
- Not an ideal option for residential use
Lastly, you should not miss out on checking this mid-range gas tankless water heater option from Eccotemp as its highly power-efficient has been rated quite good by all the past customers.
Water heaters from Eccotemp are most popular for being durable and reliable, as this model also comes with CSA certification to prove it. The installation is fairly easy as it requires 4” venting, however, the venting kit is not included in the package, so you have to buy it separately. Although it’s a budget-friendly water heater, it delivers water at a decent flow rate of 3 GPM which is good enough for a family of 5-6 members.
If we talk about its power output, it can burn up to 75,000 BTU per hour to provide you with a continuous hot water stream on-demand for as long as you want. Apart from that, since it uses natural gas, it’s quite environment-friendly, and energy-efficient as well. On top of that, Eccotemp also offers a 2-year long warranty for this heater which is a great add-on.
- Max power output of 75000BTUs/Hr
- Delivers hot water at 3 GPM
- Comes with CSA certification
- 2-year warranty
- High energy-efficiency
- Affordable pricing
- The venting kit is not included in the package
Airthereal 9kW Electric Tankless Water Heater is a practical solution for consistent hot water. No more waiting for hot water to refill. This compact heater offers on-demand hot water, potentially saving energy and space. It adjusts energy usage as needed, which could lead to reduced water heating costs. Just ensure you have 240 voltage and a 40 amp circuit breaker. Safety features like high temperature protection and leakage prevention are included. Keep in mind your home size, climate, and water pressure when choosing. The Airthereal 9kW Electric Tankless Water Heater suits various needs.
- Max power output of 9KW
- Delivers hot water at 475GMP
- Compact design
- Continuous hot water supply
- Saves space
- Reduces energy bills
- Enhanced safety
- Limited simultaneous use in high demand
Buying Guide for the Best Tankless Water Heater
Instant water heaters, or say, tankless water heaters are the most appreciated because of their capability to deliver on-demand hot water, for as long as required. That said, if you are looking for one, we have already mentioned a bunch of good options in the list above already.
However, if you are not able to decide which one to pick, reading this buying guide might help you out a little bit. We will be covering all the major important factors that every buyer should consider before spending their money on a tankless water heater, so don’t forget to give this guide a thorough read, as it contains a lot of helpful information for you.
1. Water Flow Rate
First of all, depending on your hot water requirements, if you have a large family of more than 6 members, a water heater with a high water flow rate is recommended. In other words, if you want your water heater to provide hot water in two or more showers and a few faucets at the same time, it should at least have a water flow rating between 5-10 GPM. On the other hand, if you have a small family of about 3-4 members, you can also choose water heaters that offer a flow rate of 3-5 GPM.
2. Fuel Type
As you might already know, tankless water heaters do come in a lot of varieties, such as some operate using electricity while the others use gas as fuel for combustion to heat up water. Hence, depending on your requirements and choice, you can choose an option that suits you the best.
Generally, if you are not going to use the heater daily, you can invest in an electric water heater as they require less maintenance. On the other hand, for everyday use, a natural gas water heater is quite a reliable option for household use. On the other hand, if you want a portable water heater, you should go for propane water heaters as they are generally easy to use and install as well.
3. Power Output
To check how powerful a water heater is, you can check its power output. In the case of electric water heaters, the power output is generally measured in watts such as 14kW, 18kW, etc. where more power is obviously a better option to pick. On the other hand, the power output of gas water heaters is measured in BTUs/Hr which is typically the rate at which the heater heats up the water.
So, in this case, also, the larger numbers usually mean more power. For instance, a water heater with 150000 BTUs/Hr output will obviously heat up water faster than a 41000 BTUs/Hr water heater. So, to manage the continuous flow of hot water, less-powered gas water heaters offer water at a slow rate to heat it optimally to your desired temperature.
In the case of electric water heaters, ventilation is not as needed. But, if you are looking forward to choosing a gas tankless water heater, taking care of proper ventilation is quite necessary as various harmful gases are released along with steam during the combustion of natural gas or propane. While some of the water heaters come with a venting kit included in the box, not all of them. So, make sure to check for that before buying, otherwise, you will need to buy a venting kit from the after-market separately.
Although the build quality of all the water heaters that we have mentioned in the list is top-notch. And, they also come with plenty of safety features, there may be situations where your water heater might just stop working or any part gets damaged somehow. In that case, if you have the water heater under its warranty, getting a free repair or replacement becomes very easy.
For your peace of mind, we have only chosen water heater options from well-reputed brands that offer good and long warranties for their products. While some brands offer a 5-10 year long warranty, there are a few options that also come with a lifetime warranty as well.
We hope you have read about all the tankless water heaters, and also the buying guide that we have mentioned for you. So, if you did, choosing the best suitable water heater option from the list should not be a hard task for you, as we have clearly mentioned all the important details.
In case you are still not able to make your final decision, we have a few good personal recommendations, so feel free to choose one from them and get yourself a good water heater for your home.
- In case you want an electric water heater, the EcoSmart ECO 18 Electric Tankless Water Heater should be your first choice to pick as it has a power output of 18kW, and offers hot water at a rate of 4.3GPM. In fact, the self-modulation technology makes it use less power and saves energy. On top of that, the lifetime warranty offered by the brand accounts for its high reliability.
- If you have a big family and the hot water requirement is high, you should choose the Rinnai Indoor Tankless Hot Water Heater V65iN as its rated power output is 150000 BTUs/Hr, and is capable of delivering water at 6.3 GPM. Since it uses Natural Gas, it’s environment-friendly and will help you save a lot of money in the long run. Moreover, the brand also offers a 10-year warranty for the heat exchanger unit which is quite good.
- On the other hand, if you are looking for an affordable and portable water heater for your RV trailer, the GASLAND Outdoors BE158 Portable Gas Water Heater is the best option to pick. It comes with an in-built showerhead and delivers a max power output of 41000 BTUs/Hr by propane combustion. In addition, the installation is quite simple and you will also get a 1-year warranty on it.