Best 120-110 Volt Tankless Water Heater in 2022

Tankless water heaters are available in different sizes having different capacities of delivering hot water on demand instantaneously. Small heaters are designed as point-of-use water heaters that draw less energy. The mini tankless heater may be of 110volts or 120volts. 

Sparing much floor space due to its compact size and sleek shape, excellent performance, and use of less electricity to supply hot water, the best 110 volt tankless water heater is making noise around the world.   

best 110 volt tankless water heater

As compared to the whole house tankless water heater who is capable of providing instant hot water to the entire home, these 120-110 Volt water heaters have limited capacity to heat water. 

First of all, you have to determine what size of small tankless water heater suits you. If you want to eliminate long waits for the hot water and want quick delivery of instant hot water from the lavatory sinks, kitchen, and other water applications, then these 110volts tankless water heaters make your day more active. 

Top 7 Best 110-120 volt Tankless Water Heater List 

110-volt heaters are available with different price tags depending on their water flow capacity. Let’s analyze the top 110v water heaters that are efficient and budget-friendly. 

This tankless hot water heater review makes it easy to choose the best option for you.

Image Product Details   Price
Stiebel Eltron 233219 2.5 gallon, 1300W, 120V SHC 2.5 Mini-Tank Electric Water Heater1 Stiebel Eltron 120V Tankless Water Heater 2.5 Gallon Check Price
Kbxstart 110V Hot Water Heater Kbxstart 110V Hot Water Heater LCD Digital Display Check Price
Lyty 110v 120v Tankless Hot Water Heater Lyty 110v/120v Tankless Hot Water Heater For Low Water Flow Check Price
Tinsay 13 Gallon Electric Instant Water Heater Electric Hot Water Heater Heating Tap for Kitchen Barthroom Household 110V 1 Tinsy Electric Instant Water Heater 13 Gallon Check Price
Stiebel Eltron DHC 3-1 Tankless Electric Water Heater Stiebel Eltron DHC 3-1 Tankless Electric Water Heater Single Sink Point-of-Use Check Price
Rheem Rtex 120v point of use electric tankless water heater 1 Rheem RTEX-04 120V Electric Tankless Water Heater Point of Use Check Price
WUPYI 110V Electric Water Heater WUPYI 110V Electric Water Heater Portable Water Heater Check Price

1. Stiebel Eltron 2.5 gallon 120V Electric120v Tankless Water Heater

110v plug in tankless water heater
Stiebel Eltron 120V Tankless Water Heater

Stiebel Eltron plugs into standard 120 volt outlet, wall-mounted with included brackets, T and P valves. This is a glass-lined tank with fast recovery.

Stiebel Eltron 120V is feasible when you are looking for a water heater directly plugged into your standard electrical outlet without demanding extra wiring. They are designed to supply hot water fast while ensuring water and energy saving making it an ideal 120v tankless water heater. Bear in mind that a 120V tankless water heater is typically used for low-demand applications, such as in small apartments or for point-of-use installations where hot water is needed at a specific location, such as a sink or shower. It is important to note that 120V tankless water heaters are generally designed for lower flow rates and may not be suitable for supplying hot water to multiple outlets simultaneously or for high-demand situations.

Get Hot Water Fast

This mini water heater is designed to serve either as a point of use for lavatory sinks or other water appliances or as a booster for the central tank located remotely. With 2.5 gallon capacity, you get hot water fast when and where you need it. 

It can also be used as a stand-alone supplier of hot water instantly making it best under sink tankless water heater 120v.

Convenient Temperature Adjustment

The convenient thermostat dial located on the top easily allows you to adjust water temperature between 86°F to 140°F. Featuring a special frost protection setting, this 110v water heater allows to retain internal tank temperature above freezing. 

Flat Back & Easy Installation

120 volts tankless heater Fits under sinks easily

The flat back with space-saving design of this heater makes it easy to install near the water application, mount on the wall or just sit on the floor. T and P valves are included. Being a lightweight and compact tankless heater, you can easily use it for bathroom and kitchen sinks, laundry areas, RVs, food trucks, and gas stations. 


  • Delivers hot water instantly
  • Saves water and electricity
  • Convenient water adjustment
  • Lightweight and affordable


  • Durability is not guaranteed
  • Leaking issues are reported

2. Kbxstart 110V Hot Water Heater LCD Digtal Display 110v Plug in Tankless Water Heater

best 110v hot water heater
Kbxstart 110V Hot Water Heater

This mini instant water heater freely adjusts water temperature by water flow and heats water within 3 – 5 seconds. it has an anti-leakage protection device

This 110v plug in tankless water heater is surprisingly efficient, heats water within 3 to 5 seconds, providing ultra safety, and easy to use. This heart runs at 110v / 120v, 2.5 square millimeters wire, and a 32 amp circuit breaker. Otherwise, it is easy to cause tripping.

3-5 Seconds Instant Heating

Being a 3kw water heater, this 110v water heater model heats water very quickly almost between 3 to 5 seconds, and saves your valuable time. Designed for low water flow, it is the best match for kitchen sinks or handwashing sinks.

On the downside, it is not a good option to be used for bathing and hair washing as its outlet water temperature does not get much hot. 

Simple Operation

Featuring an LCD display, this heater allows you to monitor the exact water temperature. It automatically adjusts water temperature by sensing water flow. Under usual external temperature, the water temperature range falls between 95°F to 131°F. 

Inlet and Outlet Water Temperature infographics

Ultra Safety

Well, the safety measures of this unit are impressive. It includes  IPX4 anti-splash protection, hydroelectric isolation protection, anti-leakage protection device, house insulation protection,  anti-dry protection, and other security measures.

Kbxstart tankless Size Information

Easy to install

This easy to install under sink tankless water heater 120v does not require experts for installation.


  • Quickly heats the water
  • Advanced safety protection
  • Draws less energy
  • Automatic water temperature adjustments


  • Does not meet outdoor water pressure
  • Low water flow

Tankless brands are continuously updating their technologies and bringing latest and modern version of tankless hot water such as point-of-use tankless water heater and smart heaters for RVs.

3. Lyty 3kw at 110V/ 120V 110v Tankless Water Heater

110v/120v best tankless water heater
Lyty 110v/120v Tankless Hot Water Heater

Lyty 110v/120v heats water when the flow is more than 0.6 liters and turns off when lower than 0.4 liters. The temp is between 33 – 55°C. It needs 10 gauge wire with a 30 amp breaker.

Lyty, being a 120-110 Volt Tankless Water Heater, delivers endless hot water with stable flow instantly eliminating the preheat time. For electrical requirements, it needs 10 gauge wire with a 30amp breaker at 110V / 120V. 

Endless Hot Water

This highly efficient and energy-saving 110v tankless water heater does not require preheating. Rather, it provides hot water with your desired temperature as you turn on the tap. 

Eco & Electric & Water Saving

To ensure a pollution-free environment, this heat does not exhaust gas making it an eco-friendly tankless model. It consumes less energy and saves up to 55% on electric costs. By heating the water instantly, this heater saves water. 

Work Depend on The Flow 

This heart activates to heat water with either 0.6 liters flow rate or more and turns off when the flow is lower than 0.4 liters. The temperature remains between  30 ~ 55℃. The temperature is low with large flow and becomes high with the small flow. 

You can easily control the outlet temperature on the display by adjusting the flow. 

Compact Design, Wide Use 

110v 120v Tankless Hot Water Heater for Hand/Face/Dishes Washing Kitchen Bathroom(Designed for Low Water Flow Use Only

The sleek look and compact design make it easy to install anywhere in small spaces. The heater smartly meets your various needs and can be used in bathrooms, kitchens, and public restrooms to wash hands, face, and dishes only. You can have a 5.5kw model to fulfill excessive demand for hot water.


  • Supplies endless hot water
  • Eliminates preheat waiting time
  • Eco friendly and water saver
  • Nice water flow for low demand


  • Has some electric issues

4. Tinsay 13 Gallon 120v Electric Instant Tankless Water Heater

small electric water heater 110v
Tinsy Electric Instant Water Heater

Stiebel Eltron plugs into standard 120 volt outlet, wall-mounted with included brackets, T and P valves. This is a glass-lined tank with fast recovery.

Tinsy is an electric instant water heater with the capacity of 13 gallons runs at 110V. It is a lightweight heater that fulfills multiple demands of various families intelligently. 

Full Automatic Control

What makes this heater a favorite of many is its advanced control system works automatically. Without leaving you in trouble, it adds cold water, heats it, and controls temperature automatically. 

Digital control makes it easy to set the desired temperature

You can adjust the temperature between 30°C to 65°C optionally. When the set temperature is achieved, the power turns off automatically. The LCD display shows the ongoing water temperature exactly. 

Advanced Safety Protection

The unit possesses excellent safety protection. To ensure protection and reliability, the unit features multiple protective devices including over-temperature protection, boil-dry protection, high hydraulic pressure protection, and last but not least is electric leakage protection. 

Ceramic Liner

Classical appearance and firm structure increase the durability of this heater. The anti-rust, anti-corrosion, anti-scale, and anti-leakage features extend the lifespan and reliability of this heater. 

Easy To Maintain

It has a simple liner cleaning system helping to save time and labor. To check and replace anode protection material, it easily mounts at sewage outfall. 

Safe And Environmentally

This heater qualifies the international standard by using green environmental materials making it safe for the environment. This electric heater smartly solves the issues of hot water for domestic tasks like dishwashing, bathing, face and hand washing. 

Easy Installation

This unit features convenient installation and easily installs in small areas in the kitchen, bathroom, and restroom. 


  • Environmental friendly
  • Next level safety measurements
  • Durable and reliable
  • Easy installation


  • The supply valve has limited thread length

5. Stiebel Eltron 120V Tankless Instant 120-110 Volt Tankless Water Heater

best 120v tankless water heater
Stiebel Eltron DHC 3-1 Tankless Electric Water Heater

Stiebel Eltron DHC 3-1 is available in many different KW sizes. It has a resettable safety high limit switch and consumes 50% less power than others.

Stiebel Eltron is definitely the best 120V tankless water heater used as a point of use on the market. This heater is equally suitable for residential and commercial use. 

Less Power Consumption

As compared to other storage-type tanks, this heater consumes 50% less energy and consequently, you save on electricity. 

Quiet operations

To ensure silent operations, it has a hydraulically controlled mechanism. So, you do not have to bear irritating sounds anymore. 

Advanced Protection

Equipped with plenty of safety features, the flow switch controls the heating element. The DHC never dries fire and fails prematurely. The high-quality copper structure offers many years of durability and reliability. 

Infographics of internal structure of stiebl eltron

User Friendly Installation

This 120-110 Volt water heater is easy to install anywhere you want. Therefore, you need not spend extra on installation. It delivers hot water to a single sink or multiple sinks depending on your personal preferences. 


  • Features advanced microprocessor control
  • Seismic proof construction
  • Durable and reliable performance
  • Sleek design fits anywhere


  • Requires low flow

6. Rheem RTEX-4 120V Point of UseBest 120 Volt Tankless Water Heater for Shower

110 water heater
Rheem RTEX-04 120V Electric Tankless Water Heater

Rheem RTEX-4 is a compact and stylish heater with digital temperature control in increments of 1F ranging from 80F to 140F. It is controlled non thermostatically.

Rheem RTEX is the smaller tankless heater of the Rheem family that works with 120-volt electrical current. It is suitable for areas having high incoming water temperatures such as Florida and allows long hot showers.

Nice Water Flow 

It has a decent flow rate of up to 0.9 GPM depending on the inlet water temperature. For colder water, it has a low flow rate of hot water. This 120 volt tankless water heater is a perfect option for low-pressure shower heads to enjoy hot showers.

Durable Unit 

This unit features robust copper immersion heating elements with a brass top to enhance durability and lifespan. 

Digital Temperature Display

This heater features a stylish digital temperature display that allows you to control the temperature with a 1-degree increment ranging from 80°F to 140°F. It only displays output temperature and is controlled non thermostatically. 

Easy Installation

Dimension of Rheem Rtex 120volt

This compact designed heater installs easily without spending extra pennies on it. Being a point-of-use under-counter water heater, it easily installs under the sinks, in the cabinets, or any small area you want.


  • Consistent and endless hot water on demand
  • 99.8% energy efficient
  • Durable and robust structure
  • Space saver and water saver
  • Parts threaded for easy replacements


  • Delivers warm water instead of hot in some areas

7. WUPYI 110V Small Electric Water Heater 110v

110v electric tankless water heater
WUPYI 110V Electric Water Heate

This 110v heater heats water with high efficiency and low power heating tube which maximizes the thermal energy benefits. It handles different water pressure in different areas smartly.

The 110V WUPYI directly heats the water with a low-power heating tube maximizing the advantage of thermal energy.

Energy Efficient Unit 

Being an energy-efficient model, this heater allows temperature adjustments ranging from 30°C to 65°C optionally. The power gets off after attaining the desired temperature. 

Multiple Installation Methods

Its overall power is 110V with 15kw offering various installation methods. It is capable of handling different water pressure in different areas particularly facilitating the families residing on high floors with low water pressure. 

hot water outlet and cold water inlet

Robust Model

WUPYI is dedicated to providing high-quality tankless heaters which are durable and reliable. 

Easy To Install

The brackets allow it to mount on the shelf, wall, or floor with ultimate ease. You can simply tap into the cold water line and install directly under the sink where hot water is required. 


  • Quality is guaranteed
  • A robust and reliable heater
  • Offers multiple installation methods
  • Installed easily


  • Leakages issues are reported by some users

8. 110V 3000W Mini Portable Hot Water HeaterInstant Electric Water Heater For Rv

110V 3000W Mini Portable Hot Water Heater - Instant Electric Water Heater For Rv

110V 3000W Mini Portable Water Heater For Rv

It runs on 110 volts and has a power rating of 3000 watts. You can use it in your kitchen, RV, or outdoor shower.

The Electric Tankless Water Heater, 110V 3000W Mini Hot Water Heater, is a portable and compact electric water heating unit designed to provide instant hot water in various applications, such as in kitchens, RVs, and outdoor showers. It features a 110-volt power supply and a power rating of 3000 watts.


The unit is designed to be lightweight and compact, making it easy to transport and install in different locations. It is suitable for applications where a traditional water heater may not be feasible or available.

Instant Hot Water

The tankless design ensures that hot water is available on-demand. When the faucet or shower is turned on, the water heater activates and rapidly heats the water as it flows through the unit, providing an immediate supply of hot water without the need for a storage tank.

LCD Display

The electric tankless water heater is equipped with an LCD display that allows users to monitor and adjust the temperature settings. This feature provides convenient control and customization of the water temperature to suit individual preferences.

Versatile Applications

The unit is suitable for various applications, including kitchens, where it can be used for tasks such as dishwashing or handwashing. It is also popular for RVs, where space is limited, and a compact water heater is needed. Additionally, it can be used for outdoor showers, providing hot water for camping, poolside showers, or other outdoor activities.

infographics of 120-110 Volt Tankless Water Heater
Infographics- Best 120-110 Volt Tankless Water Heater


Do they make 110 volt hot water heaters?

Tankless water heaters are available in different sizes. Small heaters draw 110-volt to heat enough water for a single sink. They are suitable to fulfill less demand for hot water such as hand washing.   

How many volts does a tankless water heater use?

There are many electric tankless water heater brand manufacturing heaters compatible with 110V, 220V, 208V, 220V, 240V, and 277V depending on the size.

Is an electric water heater 110 or 220?

Mostly large electric tankless heaters require 220 volts to run properly. Whereas the small heaters usually known as point of use tankless water heaters require 110 volts to be functional.

What size breaker do I need for a tankless water heater?

Usually, a tankless hot water heater requires 40 – 50 amps for each wire separately. So, the average tankless heater requires 120 amps whereas the average household capacity is 200amps. 

How many amps does a 110 hot water heater use?

The 110 volts require 15 amps to work properly. 

All in all, the 120-110 Volt tankless water heaters are designed to use as either point of use or as a booster to a central tank system. It is lightweight with a sleek design and compact shape makes its installation convenient and easy even in small places. 

Daniel Adley is a seasoned and skilled plumber with over 20 years of experience. Specializing in repairing and optimizing water appliances for large buildings, offices, and homes, he has a keen eye for efficiently identifying plumbing and maintenance issues. With a passion for his craft, Daniel brings extensive knowledge and expertise to every project, ensuring reliable and effective solutions for his clients.

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