10 Best All-Around Tankless Water Heaters, Indoor or Outdoor

Tankless heaters are becoming popular every day because of the many advantages they have over the traditional water heaters. They have a compact design and are energy efficient. The best all around tankless water heater heats water only when it’s needed, unlike the traditional ones that use energy to heat and store the water.

The good thing about water heaters is that the size of the tank doesn’t dictate the amount of water that you will use. Energy is only used when heating water and not to store it. Their mechanism is simple since they have a heating element that water passes through when you open the tap.

What Is the Best All Around Tankless Water Heater on the Market?

Picking the Top 10 Best All Around Tankless Water Heaters

What Should I Look For When Buying Best All Around Tankless Water Heater?

tankless water heater of all around

There is no room for errors when it comes to buying tankless water heaters. There are several brands out there, and you have to cautious when choosing one. Note that water passes through the electric device and may cause shocks if it’s faulty. Below are the essential things that you should consider when purchasing tankless water heaters.

Energy efficiency

The main reason for going for a tankless heater instead of the traditional ones is to save energy. This is a factor that you should consider when looking for a tankless water heater. A tankless unit outperforms a traditional water heater when it comes to saving energy. The energy efficiency of a water heater can be measured using the Energy Factor rating (EF). This rating is the usefulness of the energy coming from the unit. Units with high EF ratings are more efficient than ones with low ratings.

However, you should not the EF rating does not reflect the exact energy costs when it comes to operating costs. Tankless heaters are energy efficient, and as innovative ones are being manufactured, it’s expected that the installation and running costs will drop.


Warranties vary depending on the model and manufacturer. Most manufacturers will need you to hire a professional to install the unit and register it for you to be covered by a warranty. Ensure that you compare warranties before you settle for one. A warranty is an indication that a company trusts its product’s quality and reliability. Ensure that the company offers a warranty for parts, heat exchanger, and labor.


Tankless water heaters vary in size. The temperature required to attain a specific flow rate determines the size of the unit. You will able to know the size that matches your needs once you calculate the temperature rise and specific flow rate. A rule of thumb is to buy a heater that delivers over two gallons of water per minute. Ensure that you purchase a unit that will serve the household since there is no storage tank to supply water when there is a shortage.

Fuel type

Tankless water heaters are either powered by electricity or gas. Gas heaters have a high flow rate but are expensive to install. They need a special type of ventilation that can be costly. Electric water heaters, on the other hand, are reliable and don’t need expensive ventilation since they don’t emit any fumes.

What size of a tankless water heater do I need for a family of five?

First of all, you need to know the Gallons per Minute of hot water that the family might be using at the same time. For instance, a family of five might use water in the dishwasher, showers, and kitchen sink at the same time. Therefore, the GPM of a family of five can be between 8 and 10. Therefore, you have to choose a unit that can produce over 8 GPM of water. Also, consider the power source when choosing a tankless water heater.

Benefits of a tankless water heater


The major downside of traditional water heaters is that you may run out of water. Some family members will be forced to bath with cold water when the water runs out. All around water heaters solve this problem since they heat water instantly and not reserve it. They heat the water whenever you need, ensuring that you have a constant supply of hot water.

They have a high rate of distribution.

These devices heat the water whenever you need, and it’s possible to do various duties while utilizing one heater. For example, you can use hot water in the showers, laundry machine, and dishwasher at the same time, and the unit will support all the tasks without running out of hot water.

They are durable

Tankless water heaters come with a warranty of over ten years and may last for more than twenty decades. The average warranty of a traditional tank heater is less than ten years and can only last for one decade. All around water heaters are a valuable investment and can add value to your home.

They conserve water

A traditional heater takes up to 3 minutes to heat water and over 20 minutes to fill the storage tank. On demand heaters units heat water instantly, saving you the time that a traditional tank will take to produce hot water. Also, you will waste a lot of water while waiting for a traditional unit to heat up.

Saves space

When it comes to space, a heater takes a fraction of what the traditional one takes. You can mount it on the wall and connect to your water system. Traditional heaters, on the other hand, need to be placed in a safe place since they can be dangerous.

Pure water

As tanks age, they rust, contaminating water in the long run, tankless units solve the problem since they produce clean water that’s safe for drinking.

They save water and energy

As said above, tankless water heaters don’t have a reserve that needs the energy to keep the water hot. They are more efficient and don’t waste water like the tank heaters. Therefore, they may help you save money every month. These units only use energy when they are running. According to estimates, a tankless unit enables you to save 30% of what a tank water heater consumes annually. Therefore, switching to a tankless type will pay back in due course.

Best Tankless Water Heaters

1. Best All Around Water Heater – Ecosmart Eco 18 Water Heater



It’s easy to install and features stainless and copper components. It’s resistant to corrosion and comes with a lifetime warranty. The warranty is a clear indication that the manufacturer trusts the product.

The Ecosmart comes with a self-modulating technology to save your energy bills. It can help you save up to 60 percent of your water heating bill. Note that this product is only for residential use. It also comes with digital temperature control that’s very flexible. You can increase the temperature by one degree.



2. Whole House Natural Gas Heater – Rinnai V Series Tankless Water Heater



This tankless heater will provide endless hot water to your family and the entire home. This heater uses gas to run. The unit is equipped with ThermaCirc360 technology that circulates hot water in the pipes to ensure that you get your water as fast as possible.

It has a compact design that allows you to install the heater in various spaces such as the crawl space, attic, and the closet. The unit has a size of a suitcase that can save up to 16 square feet of space. You can also save up to 40 percent energy when compared to traditional tank heaters. It has WiFi and a mobile app timer that allows you to switch off the unit remotely.



3. Large Electric Heater – Rheem 240V RTEX Tankless Water Heater



The Rheem heater has an external thermostat control with increments of one degree for accuracy. It also features an LED display for convenience. It comes with an innovative self-modulation and adjusts power to satisfy your hot water demands.

The unit has two copper heating elements that are not only durable but reliable too. It has a flow rate of up to 4.4 gallons per minute, which is enough for an ordinary family. It’s also simple to install the unit since it has a bottom that’s compatible with NPT water connections, it also easy to replace features with a digital temperature display.



4. Compact Electric Water Heater – Stiebel Eltron Tankless Water Heater



This unit features am advanced flow control that helps maintain the water temperature automatically. Also, it reduces flow when it senses that the demand is higher than the output. It’s too small to save space and doesn’t require ventilation. It automatically measures the flow of water using self-modulation technology.

It features durable copper heating elements and runs quietly. It also a digital temperature display for accurate settings. The memory buttons will help you get the preferred temperature without having to set it over and over again. The model can heat water to 86 degrees in a few seconds. The water heater operates with reliability and comfort.

This heater comes with a seven-year warranty for leakages and an additional three-year warranty for parts. Buy this unit today and save your water and energy bills.



5. Large Natural Gas Water Heater – Rheem RTG-84XLN-1 Water Heater



This water heater features an efficient water-saving technology to save over 1000 gallons per year. It powered by hats and consumes 157000 BTU per hour. The significant advantage of the unit is that it hot start programs to minimize the cold water bursts when you switch it on. It stays in ready fire mode even when it’s off.

It comes with a recirculation pump to ensure that the water stays hot. Since it’s a gas-powered heater, it’s ideal for outdoor use and has freeze protection.



6. All Around Commercial Water Heater – Takagi T-H3-DV-N Heater



This 199000 BTU gas-powered unit can provide enough hot water for three bathrooms during the cold seasons and four in the summer. It has a compact design that allows fitting in small areas. It can help you cut down your energy costs annually.

The unit has computerized safety features to protect you and your family. Also, it’s eco-friendly since it doesn’t emit any fumes to the environment.



7. On Demand Water Heater – Eemax EEM24018 Electric Tankless Water Heater



Eemax focuses on providing a consistent and instant water supply. It features a self-modulation technology to adjust to the energy needed according to water demand. This can help you save a lot of money in terms of energy bills.

The unit is compact to save space. It’s resistant to corrosion and has a digital temperature control with an increment of one degree. It’s easy to install and has a maximum pressure of 150 psi.



8. Outdoor Tankless Water Heater – Camplux Pro Tankless Water Heater



This powerful propane-powered tankless water heater can deliver up to 7 gallons of water per minute. It’s CSA certified and has multiple protection systems. It features overheating and anti-freezing technology that guarantees safety.

It saves energy and water since it has a maximum output of 180000 BTU. It has low fume emissions that may pollute the environment.

It’s also easy and convenient to install. It takes a few minutes to produce the maximum gallons of water per minute. It also comes with digital remote control for reliable flow control. The company has a 24-hour customer service to answer all your queries.



9. Indoor Tankless Water Heater – Rinnai RL94iN HE+ Tankless Water Heater



This tankless water heater is only for indoor installation, meaning it doesn’t emit harmful fumes. It has a maximum hot water flow of 9.4 GPM. It features a Circ Logic Technology that enables you to set recirculation patterns depending on routines. It has a maximum BTU of 199000 per hour.

The heat exchanger has a warranty of 120 months, labor 12 months while parts have a 60-month warranty.



10. Portable Travel Tankless Water Heater – Gasland Tankless Water Heater



This propane-powered water heater comes with various protection functions such as flame failure, overheating, and anti-freezing protection to guarantee safety. The compact design allows you to install the unit on the wall. It’s also portable, meaning you can carry it when you go camping. It can produce 2.64 gallons per minute.

This lightweight unit can save up to 11.5 percent of energy, saving you money annually.




Tankless water heaters are a better alternative to the traditional heaters. They are compact; they provide instant hot water and save energy. These units are also affordable and don’t waste space.


Will Montgomery

Will Montgomery: Electro-Mechanical Engineer, Serial Entrepreneur, and Real Estate Enthusiast. Met David at Penn State, where he earned a BS in Electro-Mechanical Engineering and a minor in Business. Expertly manages capital equipment manufacturing, refurbishing, and repair businesses, while exploring opportunities in real estate and advocating for practical heating solutions.

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