Daily Beast Best Picks is a hand curated platform in collaboration with the Webgears Group. If you make a purchase we may receive a small commission.

Best Tankless Water Heaters

By Joanna Clayton · Dec 15, 2022

Tankless water heaters are now more popular than they were a few years ago. Many people find them efficient since they occupy a significantly smaller space and do not require as much maintenance as traditional water tank heaters. If you have a new home or want a new heater, it would be best to shift to the tankless option because it provides great convenience and an endless hot water supply. With the improvement in technology, we have found that most manufacturers are adding digital features to their units to help you have more control of the water temperature. You can set the thermostat to your liking and adjust it whenever necessary. In this article, we shall look at four common brands producing water heaters for different household sizes. Rinnai and Rheem have been huge heating and cooling household product manufacturers since their inception. EcoSmart allows you to enjoy lower heating bills and environment conservation while getting the desired hot water supply. Finally, we have the Hike Crew brand, which produces portable tankless heaters. We shall look at each item in depth and help you select your best option.
Show more

Best portable water heater

Hike Crew Portable Propane Water Heater

Hike Crew Portable Propane Water Heater

Product Dimensions ‎17.75 x 16.5 x 14.85 inches
Weight 13.2 lbs (without propane tank)
Type Portable outdoor water heater
Capacity N/A
Power Source Propane gas
Energy Efficiency N/A

Product available at:

Highly efficient water heater

Ecosmart Eco 27 Tankless Water Heater

Ecosmart Eco 27 Tankless Water Heater

Product Dimensions 17 x 3.5 x 17 inches
Weight 13.75 lbs
Type Tankless
Capacity 3 Gallons
Power Source Corded Electric
Energy Efficiency 99.8 %

Product available at:

Best budget tankless water heater

Rheem 240v Heating Chamber Rtex 13

Rheem 18kw Tankless Electric Water Heater

Product Dimensions ‎12.63 x 8.25 x 3.63 inches
Weight 8.5 lbs
Type Tankless
Capacity N/A
Power Source Battery
Energy Efficiency N/A

Product available at:

Best water heater for the whole house

Rinnai V94in Non Condensing Tankless Water Heater

Rinnai V94iN High-Efficiency Tankless Water Heater

Product Dimensions 17.5 x 30 x 13 inches
Weight ‎46.3 lbs
Type Tankless
Capacity 9.8 Gallons
Power Source Natural Gas
Energy Efficiency N/A

Product available at:

We also compared this Appliances products that could be interesting for you

All the details for our Product picks

4 of the Best Tankless Water Heaters

Jump to your favorite product

If you love camping but don't enjoy the cold showers, Hike Crew has come to your aid. They have a suitable portable water heater that you can carry during your camping trip so that you and your loved ones can enjoy using hot water at all times. The unit can use propane or electric power to heat the water, making it convenient for any camping trip. One of the superior benefits of using this model is the safety features. The heater has a fuse and tilt switch and turns off the gas automatically when the temperatures rise above 142 degrees Fahrenheit. The electric input requires a supply of 12V/5A and uses about 5.7kW per hour. With such a supply, you can use a generator to power the unit for you and your loved ones to enjoy hot baths at any time. Another perk of this unit is that it comes with its own complementary items. You get the necessary cables and adapters, a hose to connect to the inlet, and a shower head. All these fit in the carrying bag and come as one package for convenience. At the back of the unit, you will find a spigot that acts as an outlet in case you want to pour water into another container or wash your hands. If you're going to take a shower, you only need to connect the detachable showerhead attachment to the spigot. The long pipe allows you to use the head comfortably. According to the manufacturer's instructions, you should not connect the inlet to the lake, river, or any groundwater source. Put the water in a bucket or tank and connect the hose to the reservoir. This prevents any unwanted materials from getting into the heating unit. The Hike Crew portable water heater's showerhead has three different spray patterns, and you can switch them as you please. This technology comes packaged in a sleek modern look that makes it use a very small space. With everything in one package, you can rarely misplace your adapters or cables.


Each product’s warranty depends on how you used it and what caused the damage. However, if you notice any issue with your heater within the first 30 days after receiving it, you can report the issue and request a replacement or a full refund for the water heater.

Since this is an outdoor heater, it can adapt to any water source. Whether you use water from a tap or fetch the water from the lake, the heating process will continue as usual. This aspect makes it suitable for any outdoor trips and family camping endeavors. However, you should ensure you connect the hose to a bucket or a holding container that can hold a minimum of five gallons of water.

The unit supplies hot water at about 2.2 liters per minute flow rate. You can get water from the spigot or connect the shower head attachment for a hot shower. When using the showerhead, you will notice three different spray patterns, and you can use either or switch it up from time to time.

We have found this portable heater to be very convenient since it comes with all the necessary attachments. You will receive the AC/DC and 12V adapters, pump hose, showerhead attachment, power adapter, gas regulator, and bag to carry all the items. However, you can add a shower tent, portable toilet, and a propane tank for a complete experience. These come as separate additions.

Generally, this heater uses propane gas to heat the water. However, it needs a 12V power supply to power up the system and run the process. Therefore, you need to connect the gas supply, then use your adapter to connect to a generator or car output, and your heater will begin functioning.

Pros & Cons

  • Outdoor-friendly
  • Minimal power consumption
  • Saves space
  • Portable
  • Sleek display
  • Great safety features
  • Requires two energy sources
  • Not for large-scale use
We consider the Eco 27 to be a water heater for more demanding households and areas that experience chilly temperatures. Its self-regulating digital model can adjust to the energy requirements at the time, thus ensuring you have sufficient heating. With its outlet water temperature display, you can regulate the heating to your desired temperature. When the incoming water is below 37 degrees Fahrenheit, the unit can heat up to three gallons per minute. However, it can heat approximately six gallons a minute when the water is warmer. This variation comes in due to the energy required to increase the water temperature. The Eco 27 has three 9kW heating elements that have a brass top to prevent any electrolysis from happening. It has a copper heat exchanger for efficient heat transfer and uses three circuit breakers. It draws 112A and requires three sets of 8AWG wires. With this electrical power, the system has an energy efficiency of 99.8%. Therefore, you can enjoy using this heater, knowing you will not get any alarming monthly energy bills. Additionally, this unit is significantly smaller than the water tank heaters. You can fix it on a wall or place it near your point of use. Whether you need it for a Jacuzzi or your home's general supply, you need to confirm the appropriate heating requirements and size. You also need to ensure that your home meets the electrical requirements of the heater for effective usage. The product has ETL and Water Quality Association certifications, thus guaranteeing safety and convenience.


The EcoSmart company offers a lifetime of warranties for their electronics. However, this does not cover the labor costs or incidences that harm the product while in your care. If you notice any product malfunction within the first 30 days, you should contact the manufacturer for a replacement or a full-price refund.

Hard water has very little effect on a tankless heater because the unit rarely holds any water. However, minimal sedimentation may happen over time and can reduce the system’s efficiency. Therefore, softening the water will improve the heater’s lifespan and protect your general plumbing when using the water heater.

The Eco 27 has a flow rate ranging from three to six gallons per minute, depending on the temperature of the incoming water. If the inlet’s water temperature is very low, the heater uses more energy to heat a small amount at a time. However, if the surrounding is warmer, the water takes a short time to heat up, thus enabling the unit to heat more water at a time.

The heater usually comes on its own unless you request some complementary parts. Some common additions people ask for are the pressure valve and scale inhibitor. These two parts are essential in maintaining a constant hot water flow in your home when the water heater is in use.

The Eco 27 is a 27kW electric heater that needs three 40-amp double pole breakers. You also should ensure that you have a 200-amp electrical panel. The unit doesn’t require any additional battery and only needs the proper wiring and connection to a power supply.

Pros & Cons

  • Highly efficient
  • Saves space
  • Constant hot water supply
  • Saves time
  • Remote controlled
  • Reduced flow in low temperatures
  • Requires a high voltage
Our team finds this RTEX-13 unit very efficient in providing water heating in your home. It comes with an external digital control containing a thermostat with a +/- 1 accuracy. It also contains two heating elements made of durable copper that ensure the unit is not easily affected by rust. With the digital temperature display, you can easily regulate the heat to your preference or according to the need at the moment. This unit has a 99.8% energy efficiency, allowing temperature increments of as low as 1°F. Its water-saver shower head produces water at a rate of 1.5 GPM. However, the model has a typical flow rate of up to 3.57 gallons per minute. This Rheem heater uses an 18kW power supply with an amperage of 54A. Since it landed on the market in 2019, this model has received high praise for its function. However, a few people show dissatisfaction with its operation, especially since it is not compatible with shower heads and sinks with high flow rates. The company provides a favorable return policy to ensure you get the product quality you ordered. If you receive a heating unit and discover an issue with its functions within the first 30 days after receipt, you should contact the company and return the heater for a replacement or a refund. Once you buy the product on Amazon, you will enjoy free tech support to help you understand how to use the product efficiently.


When you purchase this heater, we recommend examining it and testing its effectiveness within the first few days. If you notice any defect, you are free to return it to the manufacturer and request a replacement or refund. However, once the unit stays in your home for more than a month, you cannot return it.

As with many other tankless models, hard water has no significant impact on this unit. If you live in an area with hard water, you may invest in a water-softening unit for the sake of the rest of your plumbing. Nevertheless, the heater functions appropriately, no matter the kind of water passing through it.

The Rheem RTEX-13 model has an average flow rate of 3.57 GPM. However, it has a water-saving shower head with a flow rate of 1.5 GPM, which is quite low for some households. You should ensure you install faucets that do not exceed this rate to ensure you enjoy a reliable hot water supply.

In normal circumstances, the packaging only consists of the water heater. However, upon request, you can purchase some additions, like the brass pressure valve and a scale inhibition system. The two components ensure you enjoy the correct water pressure and reduce the contaminants in the water when using the water heater.

This Rheem RTEX-13 model uses electrical power. It has a 13kW wattage and requires 240 volts to run efficiently. Since it already has an inbuilt battery, you do not need extra batteries. You should also ensure you have about 60 amps for proper temperature control.

Pros & Cons

  • Constant hot water supply
  • Energy efficient
  • Friendly return policy
  • Easy installation
  • Budget-friendly
  • Reduced flow rate
  • No temperature accuracy
We find Rinnai's tankless heater the perfect fit for any household size. It takes efficiency and comfort to a higher level by ensuring you always get enough hot water when you need it. When you order the product, you can get it together with a pressure relief valve and a scale inhibition inline water system. With these two, you can enjoy a comfortable hot water supply at a pressure of about 5.6 to 9.8 gallons per minute. With such a supply, you can enjoy using hot water for showers, laundry, and kitchen needs. The scale detection also ensures that you do not get any severe system problems that may shorten your heater's lifespan. Averagely, the heater supports about two to seven fixtures. This feature allows it to serve various people simultaneously without cutting short the supply. It also uses your natural gas or propane supply to function, which makes it suitable for families all over the U.S. A unique feature you will find with this heater is that you can connect it to your Wi-Fi. However, it cannot learn your hot water patterns and develop a schedule. If you need to activate this feature, you can purchase the module separately, as it is not part of the heater's package. Once you buy and start using the product, you cannot return it or ask for a refund. However, if the product arrives when broken or defective, you may ask for a reject the delivery or request a refund.


Your warranty efficiency will depend on your usage of the heater. Other factors, like where you bought the product, may also determine whether your warranty will be valid or not. Therefore, you need to consult the manufacturer for detailed information and guidance on the warranty on the water heater.

Hard water rarely affects the heater because the water is always in motion. This ensures a minimal chance of leaving sediments in the system that might cause clogging or a malfunction. However, over time, the unit requires maintenance and cleaning to ensure that it keeps functioning at its optimum level.

This unit supplies hot water at about 9.8 gallons per minute. The water gets heated as it passes through the system, thus giving you as much hot water as you need. You can also get an endless supply of hot water from different facilities at the same time.

The packaging usually comes with the heater only, but upon request, you may purchase a pressure valve and inhibition inline water system. You can also request the manufacturer to add the Wi-Fi module to enable you to connect your heater to your home’s internet network.

The Rinnai V94iN uses natural gas and propane. You can ask for a conversion kit to allow you to use propane instead of natural gas. However, most people power the heater using natural gas, which is more common and affordable. You do not require electrical power or batteries to run the unit.

Pros & Cons

  • Endless hot water supply
  • Long-lasting
  • Energy efficient
  • Saves on space
  • Gas-only power supply
  • No accompaniments
  • No-return policy

List of all Best Tankless Water Heaters for your needs

Product Date Price Shop
Hike Crew Portable Propane Water Heater 12/2022 $ 279.99 Buy
Ecosmart Eco 27 Tankless Water Heater 12/2022 $ 513.91 Buy
Rheem 18kw Tankless Electric Water Heater 12/2022 $ 299.00 Buy
Rinnai V94iN High-Efficiency Tankless Water Heater 12/2022 $ 977.09 Buy

How do I take care of my water heater?

Water heaters require care for them to have a long lifespan. We advocate following the manufacturer’s instructions to ensure that you get the maximum benefit from the product. The first step is to purchase the appropriate product size for your home and water needs. You should also follow the brand instructions during installation. If you are not an expert in installing water heaters, it would be best if you used the services of a professional to ensure you do everything right. You should also perform a test run immediately after installation and ensure everything is working appropriately.

Flushing the water heater once a year is crucial in keeping the system operating optimally. Over time, mineral buildup can cause clogging and corrode the system’s interior, thus causing reduced efficiency. When flushing, you need to turn off the power source and detach the valves. Then follow the manufacturer’s instructions to run water through the system for a while.

You can also use the services of a professional plumber to inspect and do the necessary repairs to keep the unit serving you for longer. When you service your heaters annually, you enjoy fewer breakdowns and less costly repairs. In the long run, this saves you a considerable amount of money.

What to consider when purchasing a tankless water heater

No matter how fancy or pocket-friendly a water heater seems, you should not purchase it blindly. You need to counter-check the requirements and see whether it fits your needs. The first thing you need to know is the kind of power supply the heater requires. Most heaters use either natural gas, propane, or electricity. Ensure that you have the needed energy source before bringing home the heater. When it comes to electric power, check the heater’s power supply requirements to confirm whether your home can comfortably supply that amount. If the heater requires a higher voltage than is available, it might not produce sufficient heating for all your household needs. However, a higher voltage in your home might damage the heater significantly.

Another item to consider is your household needs. You need to call a plumber to help determine the fixture’s flow rate and whether it corresponds with what the heater can comfortably supply. Having a higher flow rate will prevent you from getting enough hot water, and you might not be able to use more than one fixture simultaneously. This is a significant inconvenience, especially for large households.

Apart from the flow rate, you should also consider how many people may require to use hot water at the same time. If you have a higher demand for hot water, you need to find a large heater. Buying a small one to save on cost will strain the unit and cause a short lifespan. However, buying something bigger than what you need will only make the unit inefficient, and it will operate below its capacity.

Before you purchase a water heater, ensure that you have qualified personnel to perform installations and general maintenance. You shouldn’t buy a product that will cause you sleepless nights due to a lack of professional services. If you are not sure whether the technicians near you can do sufficient work, go to the manufacturer’s website and look for the pros they have near you. You can also ask the seller for this piece of information.

Finally, you need to check the physical size of the heater and look for an appropriate location before bringing it to the house. Go through the manufacturer’s website, and confirm the accurate dimensions of the unit and the conditions necessary for storage. After that, look for the best place, and prepare the area. You should also clear the site of any clutter and create some extra room for ventilation. Whether you want to mount it on the wall or place it on the ground, ensure it is away from your children’s reach.

What tankless water heater size suits my home?

Before you purchase your tankless heater, you need to know if it’s the best fit for your home. All brands make different sizes of heaters to ensure they serve various needs. Despite the physical size and price, you should ensure that you understand its capacity before buying. We advise getting professional assistance from a trained expert who can help you calculate your household requirements and if your desired heater can function optimally.

For example, if you have a rental apartment, you need a tankless heater with a high capacity that can supply adequate water to multiple users at a time. This is because you might find several residents needing hot water or taking a shower at the same time. Therefore, your preferred heater should be one that can guarantee enough heated water for as long as the fixtures keep running. Getting a small heater will cause inconveniences since it will produce water at a lower temperature than you would like.

On the other hand, if you need a heater for a small household, you should not go for one that has excessively high capacity. The bigger heater will cost you more money, and you will underutilize its function. In the long run, you will pay higher energy bills due to its consumption while only using a small portion of its capacity.

Therefore, you need to consult the manufacturer or an expert plumber and let them help you decide on the best fit for your needs. You will enjoy adequate heating, reduced energy bills, and a long-lasting heater. You also avoid frequent heater repairs due to overuse or inefficiency. It is essential to research different brands and read reviews about their products to get firsthand information on what to expect from their heaters.

Having various choices ensures that you make the best decision and avoid investing in the wrong heater. Once you know the right size, you can compare the physical size, affordability, appearance, and warranty offered by the manufacturer.

How did you like this pick?
Rate this products

Share this with your friends:

Last updated on Dec 15, 2022