Long before water heaters came, people relied mainly on firewood to heat their water for the shower. After the invention of water heaters, people mainly used tanks to store heated water. Although tanks are still used today, most people are turning to tankless water heaters. What is the best tankless water heater?
Well, you might want to know more about tankless water heater before checking on the top tankless water heater reviews.
How does a tankless water heater work?
A tankless water heater doesn’t need to heat water long before the time of use. These heaters neither require tanks to store heated water. The heaters are set to detect when you open the faucet. This is when they heat the water either by electricity or gas power. Depending on the power of your heater, you should connect and run a particular number of faucets for effective heating.
Why go for a tankless water heater?
You might find tankless water heater efficient in many ways. The unit’s main purpose of providing hot water as soon as you need it makes it better than other water heaters. Apart from saving your energy, top tankless water heaters will also serve you for more than 20 years compares to tank units that will serve you 10 to 15 years.
Best Tankless Water Heater of 2021
1. Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
The top rated tankless water heater comes with outstanding features which make your work easier. They also tend to give ample time in your bathroom for years. Rheem RTEX-13 is no exaggeration the best tankless water heater in its category.
The water heater comes with an externally adjustable digital thermostat control. With its LED display, you can easily tell the temperature at which your water is heating. You can also rely on the thermostat’s (+/1 degrees accuracy.
The unit is made from durable copper heating elements. It is also equipped with self-modulating power control. Its easy installation makes it one of the best tankless water heater for beginners. Additionally, the unit comes with side half-inch compression water connections and half NPT adapters.
With the 13kw model unit, you are up to save your energy consumption. The unit contains external controls that allow you to adjust the temperature by 1 degree Fahrenheit margin. It also comes with a 1.5 GPM showerhead and digital display 54. The product measures 12.63 by 8.25 by 3.63 inches.
View at Amazon: Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
Pros
- Energy efficient
- Simple installation
- Accurate digital thermostatic control
- Digital temperature display
Cons
- Some users complained of inconsistent water heating
2. Stiebel Eltron Tankless Heater – Tempra 36 Plus – Electric, On Demand Hot Water, Eco, White
Stiebel Eltron Tankless Heater is another good tankless water heater you might consider purchasing. The best rated tankless water heater comes with a sleek design that saves your space. It does not require venting. The 27 kW unit measures 4.63 by 16.63 by 14.5 inches.
A few of the features you might find fantastic in this unit include an electronic switch, 60 Hz single phase, 208V and wattage of 27kW. The electronic switch is activated to operate silently.
Besides, the Stiebel Eltron water heater comes with a copper sheathed heating element. The element is covered in a copper cylinder to keep it safe from external elements.
With this unit, you are assured of 7 years warranty on leakage and 3 years warranty for its parts. The water heater undergoes various tests to ensure it complies with the lead-free requirement. It is certified against NSF/ANSI 372.
View at Amazon: Stiebel Eltron Tankless Heater – Tempra 36 Plus – Electric, On Demand Hot Water, Eco, White
Pros
- Energy efficient
- Operates silently
- Certified against lead particles
- 7 years warranty on leakage and 3 years warranty on other parts
Cons
- Some customers complained of fluctuating temperatures in the middle of having a shower.
3. Rinnai RL75iN Natural Gas Tankless Hot Water Heater, 7.5 GPM
Rinnai has been a renowned water heater manufacturer for years. This time, the company brings you a top rated tankless water heater for your hot shower needs. You can also rely on this unit for a continuous flow of 7.5 GPM of hot water in your laundry or dishwasher.
A unique feature by this best tankless water heater, the ThermaCirc360 technology recirculates the hot water in the system to get you hot water as soon as you need it. The water heater measures 14 by 9.3 by 23 inches. With its compact design, you can install it literally anywhere.
The unit is also equipped with an MC-91-1US digital controller having an error code indicator. For residential use, the small tankless water heater allows a temperature setting of 98 to 140 degrees Fahrenheit.
For commercial use, you have to buy the controller separately, and it has a temperature setting of 98 to 160 degrees Fahrenheit.
View at Amazon: Rinnai RL75iN Natural Gas Tankless Hot Water Heater, 7.5 GPM
Pros
- Delivers endless hot water
- Compact and sleek design
- Applies smart technology like Wi-Fi monitoring of the system
- Reliable as you can easily swap part or entire unit with new one conveniently
Cons
- Expensive
4. EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology
If you are looking for the best tankless water heater with the most advanced technology, you might like this unit. The ecosmart ECO 18 electric tankless water heater boasts of a self-modulating technology that can save your water heating costs up to 60 percent.
The unit is highly durable and easy to use. Its copper and stainless components ensure you cut cost on replacements and maintenance. When it comes to its performance, it is one of the most efficient units. It can heat over 2.5 gallons per minute (GPM).
You are also assured of efficiency in climates with incoming water temperature start from 62 degrees Fahrenheit and above. Similarly, you can run two showers simultaneously where the incoming water has a temperature above 70 degrees Fahrenheit.
In this case, each shower should be delivering 1.5 gallons per minute. The unit measures 3.63 by 14 by 17 inches with 18 kW. Its digital temperature control lets you adjust the temperature in 1 degrees increment. Its lifetime warranty makes it one of the most reliable tankless water heaters.
View at Amazon: EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology
Pros
- Reduced purchase and operation cost
- Saves space
- Durable
- Easy to use
- Lifetime warranty for residential use.
Cons
- Heating capacity may drop in colder climates
5. Bosch Electric Mini-Tank Water Heater Tronic 3000 T 2.5-Gallon (ES2.5) – Eliminate Time for Hot Water – Shelf, Wall or Floor Mounted
Bosch has one of the most tankless water heater reviews. This is a clear indication of its popularity among tankless water heater users. The affordable tankless water heater can continuously heat your water with a flow rate of 2.5 gallons per minute.
It has a 2.5-gallon mini tank with CFC-free foam insulation all over the unit for energy efficiency. The unit is easy to install and maintain. Its 36 to 37-inch cord plugs can be quickly connected to a 120-volt outlet. It comes with brackets that you can use to mount it on your wall, shelf or floor.
The manufacturer understands the demand for hot water at the spot of the need. No waiting for minutes of your water to heat. You can also get hot water up to 2 sinks simultaneously.
The 15.5 pounds unit measures 13.75 by 10.75 by 13.75 inches.
View at Amazon: Bosch Electric Mini-Tank Water Heater Tronic 3000 T 2.5-Gallon (ES2.5) – Eliminate Time for Hot Water – Shelf, Wall or Floor Mounted
Pros
- Affordable
- Efficient as it provides hot water whenever you need it
- Takes up small space
- Easy to install
- 6-year warranty on the unit and 2-year warranty on its parts.
Cons
- Some customers complained of leaks
6. Noritz NRC66DVNG Indoor Condensing Direct Tankless Hot Water Heater, 6.6 GPM – Natural Gas
Meet the maker of the first modern tankless water heater that is electronically controlled. 40 years later, they have brought you another model of the best tankless water heater. The Noritz NRC66DVNG boasts of the highest flow rate of hot water in its category.
The 6.5 gallons per minute of hot water is enough for your comfortable hot shower. This unit can also be vented with a 3-inch schedule of 40/80 PVC, PP or CPVC. Thanks to the several adaptors and terminations ideal for a wide array of venting options.
Besides, you get a 6-inch power cord when you buy this product. The unit measures 6.7 by 13.8 by 23.6 inches. You might like its remote thermostat, low nox, built-in controller, and advanced heat exchanger design.
View at Amazon: Noritz NRC66DVNG Indoor Condensing Direct Tankless Hot Water Heater, 6.6 GPM – Natural Gas
Pros
- Allows for wide array of venting options
- Comes with an advanced heat exchanger design
- High hot water flow rate
- High efficiency
- 12-year warranty on heat exchanger, 5-year warranty on its parts and a 1-year labor warranty.
Cons
- Takes time before hot water starts flowing out but maintains the hot temperature after the hot water has started flowing out.
7. Marey ECO110 220V Self-Modulating 11 kW, Small, White
Marey ECO110 is by no exaggeration another best tankless water heater. The unit boasts of a corrosion-resistant patented heating element. Besides, it is designed with smart technology. Its LCD panel makes it easy to program and determine the exact temperature you want, saving energy.
If you want hot water the moment you open your faucet, check out this water heater. The 220V ECO 11kw uses 5 to 85 psi to activate a continuous flow of hot water. You can also use 2 points simultaneously in areas with incoming water with a temperature of 70 degrees Fahrenheit and above.
In a colder environment, you will have to stick to a single point of use at 1.3 gallons per minute. The most efficient tankless water heater maintains its standards throughout its lifetime. The manufacturer offers 5 years warranty on this product. The unit measures 3.1 by 7.5 by 10.8 inches.
View at Amazon: Marey ECO110 220V Self-Modulating 11 kW, Small, White
Pros
- Corrosion-resistant
- Smart technology makes it easy to use
- Consistent efficiency
- 5 years warranty
Cons
- Some customers complained of unreachable customer care services
8. Rheem RTEX-18 18kW 240V Electric Tankless Water Heater, small, Gray
Rheem RTEX is known for its advanced self-modulation feature. The small size water heater does the work for you of adjusting power to meet your hot water demand.
The efficient water heater comes with external digital thermostatic control. Besides, its LED display makes it easy for you to operate and read the temperature. The unit allows you to make a temperature increment of 1 degree Fahrenheit.
Rheem RTEX also comes with a copper immersion two heating elements that you can rely on for an extended period. You are also assured of a continuous flow of hot water at a rate of 4.4 GPM.
The unit is threaded, which makes it simple to install and replace any part. It measures 18.25 by 3.5 by 14.5 inches. It has a voltage of 240V and wattage of 18kw.
View at Amazon: Rheem RTEX-18 18kW 240V Electric Tankless Water Heater, small, Gray
Pros
- Digital temperatures display
- Easy installation and replacement
- Self-modulation providing water as per your demand.
- Durable copper heating elements
Cons
- Some customers complained of reduced heating temperature after some time of use.
9. Eemax EEM24027 Electric Tankless Water Heater, , Blue
Like the other top tankless water heaters, Eemax EEM24027 electric tankless water heater is made to offer you a continuous supply of hot water. Besides, this unit is made to heat your water when you want to use it, saving on energy consumption.
This is another water heater with advanced self-modulating technology. The feature is excellent at adjusting the energy levels input depending on the need for hot water. This water heater is made to offer a flow rate of 5.3 GPM.
The 240V and 27kw unit can serve you up to 3 points of use (1 shower, 2 sinks) at the same time in colder climates. In warmer climates, the unit can heat water to serve you with up to 4 points of use (4 showers or sinks) at the same time.
Eemax EEM24027 measures 17 by 17 by 3.75 inches. The compact design saves you space, with its stainless steel material guaranteeing durability.
View at Amazon: Eemax EEM24027 Electric Tankless Water Heater, , Blue
Pros
- Provides hot water instantly and consistently
- Advanced self-modulating technology to offer hot water as demanded
- Compact design that saves space
- Versatile with its ability to produce hot water for multiple showers and sinks simultaneously.
- 5-year warranty for leaks and a 1-year warranty for parts.
Cons
- Consumes relatively more energy compared to most tankless water heater
Conclusion
With unique features and varied cost, these are the best tankless water heater reviews you can familiarize with. Although all the products work amazingly to provide hot water shower and hot water for dishwasher or laundry, every unit is designed by different manufacturers focusing on particular features.
The final decision lies with you. Check out a unit’s reliability, efficiency, cost of buying and installation, durability and so forth. You can also consider the pros and cons of each product to determine the best tankless water heater for you.
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