8 Best 110v/120v Tankless Water Heaters

If you need small point-of-use tankless water heater that is not just efficient but also can heat enough hot water for entire household then you must go for 110-volt tankless water heaters. These tankless water heaters with low flow 120-110 volt options are also suitable for a single hand washing sink.

This invention of the 110-Volt tankless water heater will provide you a cost-effective and reliable hot-water heating solution without the hassles of large-scale water heaters.

A 110-Volt heater is a common option because it doesn’t necessitate many changes to operate in your home. Because of the lower voltage, you may use a conventional plug that you most likely already have in your home instead of a 240-Volt plug, which is more costly to install and typically necessitates the services of a plumber. There are hundreds of high-quality 110-Volt tankless water heaters on the market, making finding the right one a challenging job. When finding the right and best 110-volt tankless water heater for you, there is a range of factors to consider.

When comparing models, variables like climate and groundwater temperature will play a major role, but don’t worry; we’re here to point you in the right direction. You’ll find a rundown of our top-8 favorite and best 110-volt tankless water heater in this post, as well as a buying guide to help you figure out which one is right for you.

Best 110v/120v Tankless water Heater Compared.

It can be difficult to choose the right electric tankless water heater for your needs, but I’ll make it easy for you.

Image Product Details   Price
61HzVkQ8WTL._AC_SL1500_ Bosch Electric Mini-Tank Water Heater Volt: 120v
GPM: six gallons per hour
Power:1440 watts
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51m71-yLWBL._AC_SL1000_ Stiebel Eltron Tankless Heater Volt: 120
Power: 208/240 watt
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51ESMBPquoL._AC_SL1001_ Camplux ME25 Mini Tank Electric Water Heater Volt: 120v
GPM:  3.18 GPM 
Power: , 1.44kW
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61PA-6jgUML._AC_SL1500_ Ecosmart POU 3.5 Point of Use Electric Tankless Water Heater Volt: 120v
GPM: 0.5 gpm 
Power: 3.5-kw
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51eDgr9DBWL._AC_SL1000_ Ecosmart ECO MINI 2.5 2.5-Gallon 120V Electric Mini-Tank Water Heater Volt: 120v
GPM: 2.5Gallon
Power: 12 kW
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51T2hWhecLL._AC_SL1001_ Thermoflow UT10 2.5 Gallons Electric Mini-Tank Water Heater Volt: 110V-120V
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7 Stiebel Eltron DHC 3-1 Volt: 240V
1.3 gallons
9600 watts
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pr2 Rinnai Indoor Tankless Hot Water Heater Volt: 120 Volts
6.3 GPM
40 watt
Check Price

1. Bosch Electric Mini-Tank Water Heater

Our first choice for the best 110v tankless water heater is Bosch ES4 Tronic 3000 T Electric water heater. This Bosch ES4 Tronic 3000 T Electric water heater provides hot water when and where it’s needed. This point-of-use mini-tank with a 2.5-gallon capacity fits conveniently under your sink and offers a practical and reliable solution to your hot water needs.

With the 36-37″ cable, this smaller model can be plugged directly into a 120-volt outlet or mounted in-line with a larger hot water source to provide “on-demand” use. The glass-lined tank provides excellent insulation and longevity, and the heater’s fast recovery rate reduces long hot water wait times.

Bosch Electric Mini-Tank Water Heater

Key Features:

  • Provides hot water quickly at point-of-use
  • Electrical requirements (Amp 12A/Volts 120)
  • Units can be wall/floor mounted
  • temperature range of 65-145°F max
  • Glass-lined tank for long service life
  • 120VAC plug-in connection (1440 Watts)

You can easily control the temperature range with an external knob, and the temperature-and-pressure relief valve ensures your protection. When mounted in a visible position, the ES4 Tronic 3000 T from Bosch has a sleek and attractive exterior design blended seamlessly with existing décor, making this heater a great choice in any space.

The 4-gallon point-of-use mini-tank fits under your sink to provide hot water right where you need it, making it a conventional water heater.


The 4-gallon point-of-use mini-tank fits under your sink and offers hot water when you need it. Thermodynamic efficiency is 98%.


This electric water heater is simple to maintain and has a premium glass-lined material that will last a long time.


For independent installation or in-line with a large hot water source, the 36-37″ cord plugs into a 120-volt outlet.


Long waits for hot water at the sink are a thing of the past; now, you can have hot water whenever you want it.

  • Convenient hot water heater
  • Fast recovery rate
  • Easily mounted
  • Independent installation
  • Warranty only if the unit is installed by professionals, which is very expensive.

2. Stiebel Eltron Tankless Heater

Stiebel Eltron, a German company, is widely regarded as the best electric water heater manufacturer. The patented Advanced Flow Control is the main benefit of the Stiebel Eltron Tempra Plus and the reason it’s the best electric tankless heater. This tech goes above and beyond to maintain powerful hot water flow automatically. If the capacity is exceeded, the AFC reduces the hot water flow and makes the necessary adjustments to improve the heat exchanger’s energy efficiency.

Stiebel Eltron Tankless Heater

Key Features:

  • Patented Advanced Flow Control to control the hot water flow Wide range
  • Self-Modulation Energy Technology
  • Advanced flow control
  • Max. temperature rises: 54 F/41 F at 1.50 GPM, 36 F/27 F at 2.25 GPM, 27 F/20 F at 3.00 GPM
  • Digital Display
  • Temperature range from 68 to 140 degrees

If you want a light-weight heater, then this unit itself is small and light, weighing only 16.1 pounds for the best-selling 24 kW Tempra Plus. It is powerful enough to meet the hot water needs of an entire household. It can lift the temperature of water from 86 degrees to 140 degrees Fahrenheit. It will take a 150A electric grid to achieve this flow. Modern homes already have it; older homes would need an upgrade to the electrical grid. It is one of the best 120-volt tankless water heaters.


Stiebel Eltron’s proprietary Advanced Flow Control technology automatically regulates water temperature for consistent comfort. If the demand for hot water exceeds the capacity, the flow will be reduced slightly. Showers will never be cut short again.


Its light-weight, white nature saves space while also offering endless hot water for your entire home, and it needs no venting. With auto-modulation and the ability to electronically regulate water flow, this environmentally friendly device saves energy. The savings dashboard will also show you how much money you save on energy bills.


The water heater is triggered by an electronic switch and is absolutely silent while in operation. It has a digital temperature monitor and preset temperature and memory buttons, while the interior solid copper heating system does all of the heavy liftings.

  • Most energy-efficient tankless heater with 0.99 EF
  • Wide range of available models (from 12 kW to the strongest 36 kW)
  • Reliable
  • Digital display
  • Expensive
  • This unit may need an upgraded electric grid

3. Camplux ME25 Mini Tank Electric Water Heater

The Camplux ME25 Mini Tank Electric Water Heater contains a 2.5 Gallons tank available with the model. It is a good choice for any steady tank. The heavy-duty coating is used to coat the internal tank materials. This coating greatly aids in preventing the formation of limestone within the product. Since it comes with both mounting and stands options, we considered the Camplux ME25 Mini Tank Electric Water Heater to be slightly easier to build. It could, however, be slightly heavier.

Camplux ME25 Mini Tank

Key Features:

  • Camplux ME25 Point-of-Use Mini-Tank Water Heater stores up to 2.5 Gallons of water
  • Save water by eliminating the wait for hot water to reach the faucet,
  • The glass-lined tank offers great insulation and durability
  • An external dial allows you to control the temperature range easily
  • Warranty – 1 Year
  • Efficiency – 95%

You can place it on a shelf, a wall, or the floor. To have hot water, simply tap into the cold water line and mount the water heater directly at the sink. When it comes to using a proper product for your small family, the Camplux ME25 Mini Tank Electric Water Heater tends to be a top buy. It has a high ranking, which means it will last a long time.

  • Saving Energy & Money

Built-in insulation foam prevents heat loss. 2.5-gallon point-of-use mini-tank works under your sink to provide hot water right where you need it.

  • High-Quality Built & Elegant Design

The glass-lined tank on the Camplux electric water heater guarantees a long service life and ease of maintenance. This unit is covered with an elegant, sleek style that enhances the beauty of your kitchen.

  • UL Approval Safety

Thermostat control helps you to adjust the temperature of the water. Overheating is covered by the High Limit system.

  • Thermostat Function & Freeze Protection

The CAMPLUX mini-tank water heater is equipped with an adjustable thermostat that, once set, will automatically control water temperature. The red indicator lamp remains illuminated while the water is being heated.

  • Easy installation
  • Reduce Heating Losses
  • Quick Hot Water Supply
  • Friendly to Small Spaces
  • A stylized and attractive exterior design
  • Flow rate is not high

4. Ecosmart POU 3.5 Point of Use Electric Tankless Water Heater

The Ecosmart POU 3.5 is a single point-of-use tankless water heater from the well-known Ecosmart brand. Among several water heater models available, the POU 3.5 is the company’s low-budget, low-capacity model. It is one of the best electric tankless water heaters for radiant heat.

Bathrooms, restaurants, strip malls, doctor’s offices, vessels, and recreational vehicles are all perfect places to use this machine for point-of-use hand washing (RV). It has a 0.5 gallon per minute (GPM) maximum flow rate and a 0.5 GPM sink aerator. This product is only meant to be used with a single sink. Use caution when using a shower or multiple fixtures. Please refer to the sizing guide to find the best option for your hot water needs. You’ll be happier knowing that the warm water you expect is always available, consistently, and on-demand with EcoSmart, helping you to save water and energy.

Ecosmart POU 3.5 Point of Use

Key Features

  • Size: 11 x 7 x 2.75 inches
  • Flow rate: 0.85 GPM
  • Temperature range: 140°F Maximum

You’ll have a digital display to track the temperature, which we thought was pretty cool. In contrast to other models, the size of this appliance is smaller. When it comes to continuity and durability, the brand is dependable. If you have enough electricity, this might be a good choice for your RV. 

  • Can provide hot water for one sink at 0.5 GPM in warmer climates
  • Digital Display
  • Compact size
  • Multiple Filter Media

Related Post: Best Gas tankless water Heater reviews

5. Ecosmart ECO MINI 2.5 2.5-Gallon 120V Electric Mini-Tank Water Heater

The EcoSmart ECO MINI 2.5 offers hot water anywhere you need it, from your garage to your outdoor kitchen to your recreational vehicle. By minimizing the time it takes for hot water to hit the faucet, you can conserve water. Simply attach the heater to the water supply and position it next to the sink. There’s no need for expensive recirculating lines or pumps.

Ecosmart ECO MINI 2.5

Key Features

  • Stores up to 2.6 Gallons of water to supply hot water
  • Compact size
  • Easy installation requires an appliance line cord included plug.
  • Requires no venting; unit can be installed directly at the point-of-use
  • Adjustable temperature range of 50-140 degrees F
  • Pressure relief valve included

Save water by eliminating the wait for hot water to reach the faucet. Simply tap into the waterline and install the heater directly at the sink—no need for costly recirculating lines and pumps. And when you want to eliminate the wait for hot water but need more volume, install the Eco smart heater in-line with a larger hot water source, such as a tankless heater or a storage tank heater. Light-weight and compact, these units plug into a standard 110-volt outlet.

  • Energy Efficient
  • Convenient compact design
  • It can plug into a standard outlet.
  • It has a variety of uses.
  • Very easy to install
  • Water gets cold very fast

6. Thermoflow UT10 2.5 Gallons Electric Mini-Tank Water Heater for Under Sinks 110V – 120V

You should think about the Thermoflow UT10 2.6-Gallons Electric Mini-Tank because it has some of the best safety choices. It has an automatic cut-off feature that protects the heater from overheating. It has a stainless steel tank that is both sturdy and high-quality. This tank has been specially designed to provide you with the highest level of corrosion resistance. It prevents the formation of limestone.

Thermoflow UT10 2.5 Gallons

Key Features

  • Tank Capacity – 2.6 Gallons
  • Weight – 14 Pounds
  • Warranty – 2 Years
  • Efficiency – 98%
  • Weight: 14 lbs
  • Required Breakers:1×15 AMP Double Pole

We discovered that the product has an easy-to-use process. With the plug-and-play option, the product is simple to use. It saves resources while also productivity. Furthermore, we discovered that the Thermoflow UT10 2.6-Gallons Electric Mini-Tank has a small and light-weight body. This makes it simple to position the heater in any convenient location. It is one of the best 120-volt tankless water heaters.

The Thermoflow UT10 2.6-Gallons Electric Mini-Tank is the right option for you if you have a dishwasher and a washing machine and search for a specific device. It has a good water tank that will give you a good performance.

Save Energy

This unit has low power consumption during standby. Stop heating or reheating automatically when the water heater hits a high or low fixed temperature with Germany’s Advanced Thermostop Technology.

EPS foaming Technology

Fast recovery rate reduces long waits for hot water at your sink by heating water quickly and providing better insulation.

Low standby loss power consumption

This unit has a temperature range of 45°F to 167°F, two modes of operation (energy saving and frost protection), and suitable for any season.

  • Maintenance Free Stainless Steel Tank
  • Auto Cut-Off Protection for Safety
  • 2.6 Gallons Capacity
  • Consume more energy than others

7. Stiebel Eltron DHC 3-1

DHC 3-1 by Stiebel Eltron is one of the best 110 Volt tankless water heaters we have found for you to choose from. Although it is considered a 120v tankless water heater, you can also operate it on 110v.

The DHC 3-1 is hydraulically controlled, which makes this heater incredibly quiet. This heater is suitable for residential or commercial use because of its many built-in safety features and superior design and quality. Moreover, it has a copper heating element with some built-in features. This tankless water heater is designed for installation at the point of use. This unit heats the water instantaneously whenever it flows through the heating element.

Stiebel Eltron DHC 3-1

Key Features

  • Advanced microprocessor controls
  • Self-modulating
  • Control temperature simply by setting a dial
  • Simple plumbing system design
  • Sleek design fits in anywhere
  • Seismic proof construction

Stand-by losses are eliminated. The models DHC 3-1, DHC 3-2, and DHC 4-2 come with 0.5 GPM pressure compensating flow reducers/aerators compatible with most faucets. Flow controls and faucet aerators are highly recommended in conjunction with tankless water heaters.

Some of this unit’s features are discussed below to make you choose the best unit according to your requirements.

  • Easy to Size for Any Point-of-Use or Multi-Point-of-Use Application

DHC-E may supply hot water to a single sink, multiple sinks, or low-flow showerheads in some circumstances.

  • Control temperature by setting a dial

You can set the temperature knob on the front cover and enjoy hot water from 86°F to 140 °F (30–60 °C). You can easily change the required temperature at any time. Even if the flow varies, the advanced microprocessor technology ensures that the water temperature does not deviate from the set point.

  • Sleek Design & Constant Temperature Output

This model has an exclusive Electronic Temperature Control. The Stiebel Eltron Electronic Temperature Control compensates for flow rate and incoming water temperature variations to maintain a consistent water temperature output. Smart microprocessor technology continuously tracks data from the flow sensor and two temperature sensors and micro-adjusts the heating elements to save energy.

  • Fantastic, reliable performance from proprietary technology
  • No scalding
  • Very budget-friendly model
  • Lightweight and compact design makes it easy to install
  • Can only support a single sink in a warm climate

Read Next: Reviews about Best Halogen Heaters

8. Rinnai Indoor Tankless Hot Water Heater

Rinnai’s V65iP is the ideal combination of high performance, comfort, and value. This heater is perfect for small to medium homes or remodels, as this is lightweight, easy-to-install, durable, and suitable for indoor use. It also comes with warranties that outperform the competition.

Rinnai Indoor Tankless Hot

Key Features

  • Control-R 2.0 mobile app features
  • Up to 6.5 GPM hot water flow rate
  • 6.5 Gallons water consumption
  • Compatible with Full Line of Rinnai Digital Controllers
  • Temperature Range with Controllers: 98°F – 140°F

The V65I INTERIOR-mount tankless water heater from Rinnai provides up to 6.6 gallons per minute (GPM) of hot water, making it ideal for homes with one to two bathrooms. Enjoy all of the benefits of Rinnai tankless water heating with this simple-to-install, ultra-compact unit. You will have clean, continuous hot water at a pre-set temperature while conserving energy and valuable floor space in your home.

  • Sustainable Reliability

When you combine sustainability and dependability, it’s a good investment for now and the future. Since every component of a Rinnai Tankless water heater is interchangeable, you can easily change parts instead of purchasing a new device.

  • Affordable, Efficient Savings

With this unit, you can cut CO2 emissions (compared to tanks), use less energy, and save water with efficiency bundled in a compact build.

As with this tankless water heater, you heat water only when you need it; this model uses 40% less energy than traditional tank water heaters because you heat water only when you need it.

  • Residential Factory Warranty
  • Integrated Error Code Indicator
  • Sustainable reliability
  • Hard to install
  • Special condensing vent kit

Here are some helpful tips for selecting the best heaters for your specific requirements.

Features To Consider while Buying 110v Tankless water Heater

Flow Rate

The flow rate must be the most important consideration when choosing a water heater. To calculate the optimal flow rate, determine the maximum number of devices that can operate simultaneously, add the flow rates of each device, and that is the total flow rate you need.

For example, if you want to use an electric 110v heater to run two faucets at the same time, and each faucet has a maximum flow rate of 1.5 gallons, you’ll need a heater with at least 3 gallons of capacity to meet your needs.


What would you do with the tankless water heater? Whether for an under-sink or whole-house use, for indoor or outdoor use as a car-washing source? Calculating the exact flow rate and measuring the sizes is the first step in determining the heater’s uses.

The small size is ideal for use under the sink. A big point-of-use heater does not take up a lot of floor space. If you want to use it outside, portability is an important factor to consider before purchasing.


It’s crucial to think about the voltage of electrical equipment that needs to be powered. It’s important to make sure the electrical outlet you’re using can handle the water heater’s voltage. The majority of water heaters use 120V outlets, but some might need a higher voltage supply.

Heating Power

The heating power of a device is the amount of energy it takes to heat water. Units with lower heating capacity are unable to heat larger amounts of water. The number of KW required by a heater is determined by the amount of water to be heated and the total gallons per minute required. Water heaters with a higher KW rating will heat a larger water volume faster and provide a greater temperature boost.

Energy Efficiency

A water heater’s energy efficiency is important. A heater with a higher energy efficiency means that less energy is wasted and that storing large amounts of water is easy. As a result, look into the unit’s energy efficiency ranking. A water heater with an energy efficiency of 96-98 percent is the best choice because it saves a significant amount of energy and money.

Installation and Maintenance

Make certain that the installation requirements are met. Some of the best 110 volts under-sink water heater models aren’t made specifically for your nation. As a result, the country’s requirements could not be followed. We recommend that you check if the computer can meet the installation requirements before buying it.


Another factor to remember is the water heater’s warranty. Some manufacturers have a long-term warranty on the outer body, while others only cover the internal components. It is safer to choose a heater manufacturer that provides a warranty for both the internal and external parts.

Read Next: Best electric tankless water heater reviews

Best 110v/120v Tankless Water Heaters-Frequently Asked Questions

  • Can a 110V/120V tankless water heater cover my whole house?

The realistic response is a resounding no. A 110V water heater is a low-cost, low-capacity option. In most situations, a 110V tankless electric water heater can barely meet the demand for hot water from a single faucet while operating at full power. Whereas a 240V water heater needs 15 to 30 KW of current to operate, a 110V water heater only requires 3-5KW.

  • Are 110V and 120V water heaters the same?

Both are the same words and can be used interchangeably. The voltage of residential electricity in the United States is 120V, and it is variable up to 10%. As a result, if your system is rated at 110V, it will work at 120V. As a result, you’ll see some electric goods on the market with voltages of 110V/120V written on them.

  • How many sinks can I connect with the best 110-volt tankless water heater?

Only one sink is recommended. A 110V electric water heater, as previously mentioned, is not very efficient. As a result, if you attach and use it for more than one faucet, it cannot have enough hot water. In reality, you can attach it to multiple faucets, but you won’t be able to operate them all simultaneously.

  • Can I connect a shower with my 110V heater?

You can communicate. At maximum pressure, a shower could use up to 1.5 GPM of water. As a result, make sure the best 110-volt plug-in tankless water heater you bought has a full flow rate. If the flow rate is less than 1.5 GPM, the shower may not run at full speed, or the necessary temperature may have to be compromised.

  • Is a water heater 110-Volts or 220-Volts?

Yes, the answer is A 220-Volt plug is needed for whole-house electrical water heaters, which is not always available in the location where you need them. This plug is needed because the amount of energy required to heat the water is so great that a normal 110-Volt heater would not keep up. In most cases, the 110-Volt units would fit into a normal home wall outlet, making installation a breeze. They use less energy, so they don’t need the extra voltage that a whole-house device does.

  • Is a 110-Volt tankless water heater worth buying?

If you’re looking for a small-scale water heating system that’s cheap, efficient, and affordable, then yes, These units aren’t designed to heat an entire three-bedroom house. Still, they have various other uses, and if you fall into one of those categories, they’re a great water-heating choice.

  • Can I get a 110-Volt tankless water heater for the shower?

Yes, you certainly can! Many people invest in a 110-Volt tankless water heater that is solely for showering. Check the tankless water heater’s GPM rating to ensure that the flow rate is sufficient for the shower.

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