10 Reviews: Best Tankless Water Heaters (Jul 2021)

These tankless water heaters will fit nicely in your small space due to their sleek and compact form, allowing you to have continuous hot water without taking up valuable space.

S. M. Rosyida By S. M. Rosyida · updated on · price $111.00 - $1,299.00 · 26 views

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Comparison Table

Product Image
1
10 Reviews: Best Tankless Water Heaters (Jul  2021): Space-Saving Water Heater
Rheem
2
10 Reviews: Best Tankless Water Heaters (Jul  2021): High-Efficiency Water Heater
Rheem
3
10 Reviews: Best Tankless Water Heaters (Jul  2021): Outdoor Water Heater
Rinnai
4
10 Reviews: Best Tankless Water Heaters (Jul  2021): Portable Water Heater
Eccotemp Systems LLC
5
10 Reviews: Best Tankless Water Heaters (Jul  2021): Easy Control Water Heater
Sio Green
6
10 Reviews: Best Tankless Water Heaters (Jul  2021): Water Heater with Digital Temperature Control
EcoSmart
7
10 Reviews: Best Tankless Water Heaters (Jul  2021): Compact Design Water Heater
Stiebel Eltron
8
10 Reviews: Best Tankless Water Heaters (Jul  2021): Sleek Design Water Heater
Stiebel Eltron
9
10 Reviews: Best Tankless Water Heaters (Jul  2021): Quiet Water Heater
GIRARD
10
10 Reviews: Best Tankless Water Heaters (Jul  2021): Safe Water Heater
Furrion
Product Name Performance 36 kw Self-Modulating 7.03 GPM Tankles... Performance Platinum 9.5 GPM Natural Gas High Effi... Exterior 7.5 GPM Tankless Water Heater L5 Eccotemp L5 Liquid Propane Tankless Water Heate... IR288 v2 POU Infrared Electric Tankless Water Heat... ECO 27 Electric Tankless Water Heater Tempra 29 Trend Self-Modulating 28.8 kW 5.66 GPM C... Tempra 24 Plus Whole House Tankless Electric Water... 2GWHAM Tankless Water Heater 2.4GPM Tankless Gas Water Heater
Features Space-Saving Water Heater High-Efficiency Water Heater Outdoor Water Heater Portable Water Heater Easy Control Water Heater Water Heater with Digital Temperature Control Compact Design Water Heater Sleek Design Water Heater Quiet Water Heater Safe Water Heater
FUEL TYPE Electric Natural Gas Liquid Propane, Natural Gas Liquid Propane ‎AC Electric Electric n/a Electric Propane
MEASUREMENTS 3.5" x 21.6" x 18.25" 9.75" x 18.5" x 27.5" 27'' H x 18.5'' W x 10.5'' D 16.5'' H x 11.5'' W x 5.5'' D ‎17.3 x 11 x 3 inches ‎3.63 x 17 x 17 inches 4.625" x 16.625" x 14.5" ‎21.7 x 20.1 x 9.6 inches ‎14.5 x 17.8 x 14.6 inches 12.81 x 12.62 x 20.75”
WEIGHT 19 lbs 82 lbs 63 lb. 13.8 lb. ‎10.21 pounds ‎10.98 pounds 19 lb ‎16.1 pounds ‎21.2 pounds 27.6 lb
FLOW RATE 7.03 gal (US)/min 9.5 gal (US)/min 7.5 gallons per minute 1.5 Gallons Per Minute n/a 3 gallons per minute 5.62 gal (US)/min n/a n/a 0.32 GAL (1.2L)/min
WATTAGE / VOLT 36000 Watts / 240 volt 120 volt n/a 3 Volts ‎9 KW / ‎240 Volts ‎27000 Watts / ‎240 Volts 28800 Watts / 240 Volts ‎18000 watts / ‎208 Volts n/a n/a
price $560.00 $1,299.00 $1,113.11 $144.00 $368.10 $438.76 $111.00 $698.00 $544.69 $679.90
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It’s small and sleek, yet it’s a true lifesaver. A tankless water heater is designed to fit into a small space, allowing you to save valuable space in your home. Since there is no storage tank to deplete, this style of heater never runs out of hot water! Instead, you’ll have access to warm water on demand as you want. Well, the good news is, it even produces hot, scorching water 24 hours a day, seven days a week while simultaneously lowering energy bills, so it shouldn’t be overlooked, right? As a result, we’ve compiled a list of the 10 best tankless water heaters to consider. Read it, pick one, put it in your place, and relax with the hot water it provides.

Frequently Asked Questions (FAQs)

In case you don't know

How do I choose a water heater?

Consider the following:
1. Type of fuel. The fuel type or energy source you use for water heating will affect not only the annual operating costs of the water heater, but also its size and energy efficiency.
2. Dimensions. Make sure to select one that is a perfect fit for your space.
3. Energy efficiency. It is critical to understand how much electricity you will spend on the water heater by selecting the Volt and Wattage.

Should I turn my water heater off at night?

It is common knowledge that it is preferable to leave the hot water heater on all of the time rather than turning it on and off. But, in reality, you don't need to heat your water all the time. Your immersion heater or boiler will heat stored hot water in a tank.

What is the standard size hot water tank?

Most homes have a water heater that holds between 40 and 60 gallons. Larger tanks are typically used in homes with a hot tub or other hot water requirements. Alternatively, you can follow one of the experts' rules:
1. 30-40 gallons for 1 to 2 people
2. 40-50 gallons for 2 to 3 people
3. 50-60 gallons for 3 to 4 people
4. For groups of 5 or more people: 60-80 gallons

Which is better electric or gas water heater?

These are the two most common types of water heaters. Natural gas is used to generate the energy required to heat water in gas water heaters, whereas electric resistance coils are used in electric heaters. Both are suitable for installation in your home, but you should consider factors such as your energy bill and the efficiency of your entire family before deciding which one is best for you.

10 Reviews: Best Tankless Water Heaters (Jul 2021)

Rheem Performance 36 kw Self-Modulating 7.03 GPM Tankless Electric Water Heater - Best Tankless Water Heaters: Space-Saving Water Heater
https://www.homedepot.com/

1.
Rheem
Performance 36 kw Self-Modulating 7.03 GPM Tankless Electric Water Heater

Space-Saving Water Heater

price from
$560.00
Our Opinion:

Rheem, a well-known brand, offers this space-saving water heater that is ideal for those with limited space. Don't be tricked by its small size; it can provide hot water for up to 5 showers and 2 faucets, thus it's ideal for the whole family. It has long-lasting and simple-to-replace heating elements, making it simple to maintain.

Promising Review:

We live in a 2700 Square feet home in Florida with 4 bedrooms & 3.5 baths. We have your typical dishwasher and washing machine. We purchased the 27KW unit for our entire house. The installation was easy and instructions straight forward. The unit is able to heat the water through the entire house, even while 2 are showering and the dishwasher is running. Overall, we are very satisfied with this unit.

by Ajtampa

FUEL TYPE Electric
MEASUREMENTS 3.5" x 21.6" x 18.25"
WEIGHT 19 lbs
FLOW RATE 7.03 gal (US)/min
WATTAGE / VOLT 36000 Watts / 240 volt
Rheem Performance Platinum 9.5 GPM Natural Gas High Efficiency Indoor Tankless Water Heater - Best Tankless Water Heaters: High-Efficiency Water Heater
https://www.homedepot.com/

2.
Rheem
Performance Platinum 9.5 GPM Natural Gas High Efficiency Indoor Tankless Water Heater

High-Efficiency Water Heater

price from
$1,299.00
Our Opinion:

Rheem has come out with a high-efficiency tankless water heater that will save you over $1,100 in electricity expenses over the course of 12 years. It's made to provide you with continuous hot water anytime you need it. Because of the 9.5 GPM model, it can give hot water to up to three bathrooms at the same time. Furthermore, it has a wall-mount design, which allows you to conserve significant space.

Promising Review:

no adjustments needed, installed and worked perfectly after turning it up to 120*. saved a ton of room!

by waterheaterinstaller

FUEL TYPE Natural Gas
MEASUREMENTS 9.75" x 18.5" x 27.5"
WEIGHT 82 lbs
FLOW RATE 9.5 gal (US)/min
WATTAGE / VOLT 120 volt
Rinnai Exterior 7.5 GPM Tankless Water Heater - Best Tankless Water Heaters: Outdoor Water Heater
https://www.wayfair.com/

3.
Rinnai
Exterior 7.5 GPM Tankless Water Heater

Outdoor Water Heater

price from
$1,113.11
Our Opinion:

This water heater from Rinnai, a well-known brand, is suitable for outdoor use, making it a versatile water heater worth considering. It's a wall-mounted water heater that's easy to install in a compact location because it doesn't take up much room. There are two fuel types to pick from, so you can get the one you choose.

Promising Review:

Provided very hot water efficiently. Straightforward installation.

by Umrock371724

FUEL TYPE Liquid Propane, Natural Gas
MEASUREMENTS 27'' H x 18.5'' W x 10.5'' D
WEIGHT 63 lb.
FLOW RATE 7.5 gallons per minute
WATTAGE / VOLT n/a
Eccotemp Systems LLC L5 Eccotemp L5 Liquid Propane Tankless Water Heater - Best Tankless Water Heaters: Portable Water Heater
https://www.wayfair.com/

4.
Eccotemp Systems LLC
L5 Eccotemp L5 Liquid Propane Tankless Water Heater

Portable Water Heater

price from
$144.00
Our Opinion:

The next item on the list is this portable water heater, which you can take with you wherever you go in case you need to shower with hot water. You can use it to instantly heat water while camping, hunting, in your Tiny Home, RVs, Poolside, Washing Pets, Equestrian, Cleaning Vehicles, Greenhouses, or anywhere else you need instant, dependable, limitless hot water.

Promising Review:

I’ve had this over a year now. We use it for our camper and it’s great!!

by Erin Michelle

FUEL TYPE Liquid Propane
MEASUREMENTS 16.5'' H x 11.5'' W x 5.5'' D
WEIGHT 13.8 lb.
FLOW RATE 1.5 Gallons Per Minute
WATTAGE / VOLT 3 Volts
Sio Green IR288 v2 POU Infrared Electric Tankless Water Heater - Best Tankless Water Heaters: Easy Control Water Heater
https://www.amazon.com/

5.
Sio Green
IR288 v2 POU Infrared Electric Tankless Water Heater

Easy Control Water Heater

price from
$368.10
Our Opinion:

You can easily control it with the automatic power technology and manual mode features. Not only that, but the included water flow regulator allows you to adjust the temperature as well. As you can look, it has an ergonomic size and a simple yet innovative design that allows you to install it anywhere you want.

Promising Review:

Been using this for a few months. Had a pro install it. Have been in love with it ever since. Instant hot water and it lasts forever.

by Ryan R.

FUEL TYPE ‎AC
MEASUREMENTS ‎17.3 x 11 x 3 inches
WEIGHT ‎10.21 pounds
FLOW RATE n/a
WATTAGE / VOLT ‎9 KW / ‎240 Volts
EcoSmart ECO 27 Electric Tankless Water Heater - Best Tankless Water Heaters: Water Heater with Digital Temperature Control
https://www.amazon.com/

6.
EcoSmart
ECO 27 Electric Tankless Water Heater

Water Heater with Digital Temperature Control

price from
$438.76
Our Opinion:

Look, it has digital temperature control, so you can imagine how simple it is to set the desired temperature. This water heater is specially designed to save up to 50% on your electricity bill, and it should not be overlooked. This water heater is made of copper and stainless steel components, making it durable and easy to replace anywhere you want.

Promising Review:

I purchased this to use in our new house bc I knew we would have well water and often wells don't work well with hot water tanks (previous experience). We have 4 kids and we also had two foster daughters. We ran the dishwasher, and all showered at least once a day. We also have a large dog (not that he used that much water, but still). This machine worked like a dream. Never ran out of hot water. Always on time. No funky smells from water eroding the copper pipe in the tank. I'll never buy a water heater w a tank again.

by MA

FUEL TYPE Electric
MEASUREMENTS ‎3.63 x 17 x 17 inches
WEIGHT ‎10.98 pounds
FLOW RATE 3 gallons per minute
WATTAGE / VOLT ‎27000 Watts / ‎240 Volts
Stiebel Eltron Tempra 29 Trend Self-Modulating 28.8 kW 5.66 GPM Compact Residential Electric Tankless Water Heater - Best Tankless Water Heaters: Compact Design Water Heater
https://www.homedepot.com/

7.
Stiebel Eltron
Tempra 29 Trend Self-Modulating 28.8 kW 5.66 GPM Compact Residential Electric Tankless Water Heater

Compact Design Water Heater

price from
$111.00
Our Opinion:

Stiebel Eltron's compact design water heater is here to help you enjoy a shower with the cozy feel of warm water. As you can see, it has a digital temperature display for easy viewing and precise control. Because of the intelligent self-modulating technology, it uses the least amount of energy to heat the water, making it an energy-saving water heater worth considering. It's about the size of a briefcase and doesn't require any venting, so installing it is simple.

Promising Review:

I have a three story townhouse with four bathrooms. My new water heater has been excellent at supplying all of my hot water needs.

by SANDRA

FUEL TYPE Electric
MEASUREMENTS 4.625" x 16.625" x 14.5"
WEIGHT 19 lb
FLOW RATE 5.62 gal (US)/min
WATTAGE / VOLT 28800 Watts / 240 Volts
Stiebel Eltron Tempra 24 Plus Whole House Tankless Electric Water Heater - Best Tankless Water Heaters: Sleek Design Water Heater
https://www.amazon.com/

8.
Stiebel Eltron
Tempra 24 Plus Whole House Tankless Electric Water Heater

Sleek Design Water Heater

price from
$698.00
Our Opinion:

Another Stiebel Eltron, this time with a streamlined design that makes it simple to place anywhere you need it. As you can see, it has digital temperature control, allowing you to effortlessly adjust the temperature to your preferences. It even claimed to save you at least 15-20% on your electricity bills, so it's worth looking into.

Promising Review:

This water heater is the greatest! Not only does it give me much more room in the garage (where the old tank heater was) but it provides hot water for at least two showers and the dishwasher at the same time. I did pay to have it installed because I'm not a do-it-yourselfer but I'm already getting a return from a lower electric bill. Thanks Stiebel! Hot water on demand is the way to go!

by MeteorMike

FUEL TYPE n/a
MEASUREMENTS ‎21.7 x 20.1 x 9.6 inches
WEIGHT ‎16.1 pounds
FLOW RATE n/a
WATTAGE / VOLT ‎18000 watts / ‎208 Volts
GIRARD  2GWHAM Tankless Water Heater - Best Tankless Water Heaters: Quiet Water Heater
https://www.amazon.com/

9.
GIRARD
2GWHAM Tankless Water Heater

Quiet Water Heater

price from
$544.69
Our Opinion:

This water heater, designed for winter use, will be a lifesaver in keeping your body warm by taking a shower with hot water. This water heater's 42,000 BTUs provide the best performance for your RV's plumbing. Furthermore, it is built with a quiet brushless motor, so you will not be disturbed by any noises.

Promising Review:

I installed this heater about 4 months ago. Installation was easy enough, just a few extra trips for the right PEX fittings. I live in my trailer full time and use this heater everyday. Once you have an understanding of how the heater works as far as the required amount of flow for it to function, it operates flawlessly. Very happy with the purchase

by Noah216

FUEL TYPE Electric
MEASUREMENTS ‎14.5 x 17.8 x 14.6 inches
WEIGHT ‎21.2 pounds
FLOW RATE n/a
WATTAGE / VOLT n/a
Furrion 2.4GPM Tankless Gas Water Heater - Best Tankless Water Heaters: Safe Water Heater
https://furrion.com/

10.
Furrion
2.4GPM Tankless Gas Water Heater

Safe Water Heater

price from
$679.90
Our Opinion:

Furrion has created this tankless gas water heater with a heating capacity of 2.4GPM and a powerful 60,000BTU output, allowing it to reach hot temperatures in less than a minute even on the coldest of days. It has a pressure relief valve, over-temperature protection, blower block protection, and automatic shut-off to ensure your safety, so you can install it on your RV and use it with confidence.

FUEL TYPE Propane
MEASUREMENTS 12.81 x 12.62 x 20.75”
WEIGHT 27.6 lb
FLOW RATE 0.32 GAL (1.2L)/min
WATTAGE / VOLT n/a

Conclusion

Well, now it's your turn to choose the fittest one for your need. Don't worry, all products listed on our list above are worth considering for their durability and efficiency to help you get the warm or hot water you desired. Good luck!

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