7 Best 120 Volt Tankless Water Heater

Last Updated on September 5, 2021 by Michael

The best choice for a single bath, shower, or kitchen sink is the best 120 Volt tankless water heater. Also, it helps to save energy costs because there is no storage tank. Thus, you can save on utility expenses. Another benefit of using the 120V heater is that it is best for a tiny home, RV, or boat. These are easy to mount and install. Some of the heaters have a high flow rate for convenient hot water use. Plus, these take less space for installation. So, you have more storage space for important things.

120 volt tankless water heater

Can the tankless water heater perform like the water heater with a tank?

The tankless heater requires a 0.5 GPM to 2 GPM water flow rate to perform. However, the heater with a tank stores hot water and will provide it regardless of the flow rate. So, a heater with a tank consumes more energy to store and maintain hot water temperature. That is why it costs more utility bills and becomes an expensive choice. Thus, the tankless heater is the best choice for a tiny home or small size family home. When there is a demand for hot water, it will turn on its heating system. It stays on standby when there is no need for hot water.


Another advantage of a tankless heater is that it comes in a compact design. You can install it with comfort. Therefore, it is the best choice for apartments, tiny homes, bachelors, RVs, and boats. Also, offices and shops can use it. It will help to save on energy costs and get hot water when there is a demand. Most of the tankless heaters come with a wall plug. So, you can connect with the wall switch. Plus, there are safe and reliable. These come with multiple protections for convenient use at home or office. Hence, you can check our top seven water heaters.

Read: 110 Volt Tankless Water Heater

Best 120 Volt Tankless Water Heater Reviews

1. Bosch Tronic 3000 T

120 Volt Tankless Water Heater

check price amazon

It is a popular tankless instant water heater that comes with the recommendation of Amazon. The reason is its quality features and compact design. Installation is easy because of its size and power plug compatibility. Also, there is a 2.5 GPM flow rate with a mini 2.5-gallon tank. So, in case there is a power shut down, you can use some hot water. The thermal efficiency is 98%, and it will cost fewer electricity bills. It uses a premium glass-lined material for durability. Plus, it uses 12A and 120V electricity.


There are independent 36-inch to 37-inch cord plugs for installing with in-line and connecting with 120V outlet. When there is a hot water demand, it delivers with consistency. So, you do not have to wait for hot water in the bath or shower. There is also a fast recovery feature for this water heater. Therefore, it can supply up to two faucets or two washbasins simultaneously. You can mount it on a shelf or a wall. There is a bracket for mounting. Plus, it connects instantly with a single sink.

  • It has a 2.5 GPM flow rate.
  • You can use two sinks for hot water together.
  • There is a thermal efficiency of up to 98%.
  • The materials are durable and last long.
  • There is support for independent installation with an in-line and electric plug.
  • It has a fast recovery feature.
  • It is best for two sinks.
  • Small-size families or bachelors can use it.



2. Ecosmart POU (Best For Tiny Homes)

ecosmart 120 Volt Tankless Water Heater

check price amazon

The Ecosmart point-of-use instant water heater consumes 3.5KW and connects with a 120V plug. This brand innovates products for the best 120V tankless water heater and its energy-efficient specs. Therefore, you can be confident that it will lower energy expenses. The tankless water heater delivers endless hot water on demand. It is compact in its design and saves space. Thus, you can store other vital items in the cabinets or under the sink. There is compatibility to mount on a wall or floor. You can also use it for RVs, offices, tiny homes, and apartments.


Another benefit of this water heating device is its 0.5 to 1.5 GPM flow rate. Hence, you can use it for baths, a single sink, or showers. There is a digital temperature control system for convenient use. It can heat the water 80 to 140 F. Also, there is advanced self-modulation technology. All of its parts and materials are durable and of high quality. The field elements are easy to replace when repairing. That is why it is one of the best 120V tankless water heaters.

  • The heater only consumes 3.5KW.
  • It has a 0.5 to 1.5 GPM flow rate.
  • All materials and parts are durable and long-lasting.
  • The design is compact and lets you save space.
  • You can use it for RVs, offices, shops, cabins, and tiny homes.
  • There is a self-modulation technology.
  • It has a digital temp control system.
  • Large-size families cannot use it.
  • This water heater is best for tiny homes or cabins.



3. Camplux Tankless Water Heater

camplux 120 Volt Tankless Water Heater

check price amazon

The highlight of the Camplux water heater is its 2.65 GPM flow rate and 6-in-1 multiple protection. So, you will not have to wait for hot water. It ensures instant hot water for tiny homes, apartments, shops, and cabins. Also, it reduces electricity bills because it will only heat water when there is a demand. There are flame-out, anti-freezing, over-heating, low-pressure, and airflow protections. It also has a safety ignition system that uses electricity. The price of this water heater without a tank is budget-friendly, considering its features.


Installation and mounting on a wall or floor are easy. You can use it with a single faucet, kitchen sink, shower, or bath. There is the 1/2-inch NPT fitting and a gas inlet. Plus, there are two horizontal vent pipes. So, the ventilation process ensures that it runs safely. Also, it prolongs the life of the heater. The minimum flow rate of this heater is 0.65 GPM. Therefore, you can be sure that are no hot water breaks. The design is compact and fits anywhere for installation.

  • There is a 2.64GPM flow rate.
  • The design is compact.
  • There are 6-in-1 multiple protections.
  • Installation is easy.
  • It has two vent pipes for ventilation.
  • Also, there is a digital display.
  • It is best for bachelors or tiny homes.
  • The price is a little high.



4. Chronomite SR-30L (Best for smaller places)

check price amazon

The Chronomite SR-30L is a compact tankless heater. There is an instant hot water flow rate. Plus, it has a patented microprocessor. Therefore, it will reduce electricity costs. The heater uses an under sink connection design and is durable. It consumes 15 amperes and connects to a 120V wall socket. Installing it directly with a sink or shower is easy. Also, it comes with two mounted chrome fittings.

The best 120V tankless water heater is easy to use. You can fit it inside the kitchen sink. Also, its compact design and 0.16 ounces weight lets you install it with comfort. There is a flow rate of 0.5 GPM.

  • The design is compact.
  • Installation is easy.
  • You can use it for tiny homes, apartments, cabins, and RVs.
  • It reduces electricity bills.
  • There is a 3/8-inch cold water inlet and outlet.
  • It is not for large families’ use.
  • There can be a minute of hot water breaks.



5. Thermoflow UT15

check price amazon

There is a 4-gallon mini-tank with point-of-use for this water heater. Therefore, it is almost tankless and has the benefit of getting hot water without breaks. All of the parts and construction are durable and long-lasting. Also, it uses a stainless steel heating element. Even the mini water tank uses quality stainless steel for durability. The heater comes with Advanced Thermostop Technology. It is a new technology from Germany that helps the heater to stop working for a temperature setting. Thus, it lowers electricity bills.


The heater also has EPS Foaming Technology for the best insulation. The best 120V tankless water heater ensures that the heating of water is energy-efficient. Another advantage of this technology is that the heating element heats water fast. There is a fast recovery rate with a mini tank. Thus, it ensures you will never run out of hot water in the showers. Installing under the sink or mounting on the wall is easy. Plus, the heater has an IPX24 water-resistant body and parts. The length of the power cord is 2.6ft for a comfortable connection with a wall switch. It only weighs around 14lbs.

  • It uses German Advanced Thermostop Technology.
  • The heater ensures power-efficient operation.
  • It lowers the utility costs.
  • There is a mini 4-gallon tank.
  • The heater has all the safety protections.
  • There is an IPX24 waterproof rating.
  • You have to install it.


6. Rheem RTEX-04

check price amazon

The Rheem RTEX water heater for baths and faucets comes with a 3.5kW power. All of its construction and materials are durable. Also, there are copper immersion materials for the robust heating system. So, you can buy it with confidence. It is easy to install and comes with a digital temp display. There is a flow rate of up to 1 gallon. The design is compact and saves space. You can connect it with a single sink unit or a bath and shower.

It will provide hot water instantly when there is demand. That is why it lowers utility costs and saves energy. The package comes with a mounting bracket. It will connect to a 120V socket and draw 3.kW of electricity. All of the materials are corrosive-free.

  • The design is compact and saves space.
  • Installation and mounting are easy.
  • The package comes with a bracket.
  • There is a digital temp display.
  • It provides a constant hot water flow rate.
  • It is best for small-size families.
  • You cannot get hot water to all of the faucets.


7. Atmor Water Heater

120 Volt Tankless Water Heater reviews

check price amazon

It is a point-of-use tankless heater for a sink, shower, cabin, or kitchen sink. Also, you can use it for RVs or boats. There is a requirement of a 30 amp single pole breaker for this water heater. It comes with a 7-year warranty for leakages and a 2-year warranty for the parts. All of its materials and components are durable for daily use. However, it has a low flow rate of 0.5 GPM. Thus, you can use it for a single sink or shower. It consumes 3.5KW of electricity.


Installation is easy because of its compact size. Plus, the package comes with brass fittings. There are three temp settings for convenient use. The best 120V tankless water heater saves up to 50 percent of energy costs. There is a requirement for a 30 amp circuit breaker with a 120V connection. It has a cold water inlet and a hot water outlet. Another benefit of this water heater is its built-in one-way valve with a pressure relief device. At a low temp setting, it consumes 3.5KW, and at a high temp setting, it will consume 7.5KW.

  • It reduces electricity costs.
  • There is a one-way valve.
  • You can save up to 50% on heating costs.
  • There are three temperature settings.
  • It is best for a single sink.
  • You cannot use it for all faucets.


Buying Guide: Is the 120V Tankless Water Heater best for me?

When you plan to buy the best 120V tankless water heater, you need to consider your hot water demand. Also, it will require up to a 30 amp circuit breaker and a 120V power socket. Take measurements of the water heater and the space for installing. Most of these come in compact sizes and are easy to install or mount. However, it helps to take measurements to make sure it fits. These are the other vital things to take into consideration.

What is my hot water demand?

Before you purchase any water heater, you must consider hot water demand. The 120V mini tankless heater provides 0.5 to 1 gallon of hot water per minute. However, there are 2.5GPM flow rate water heaters that can support two sinks. So, you can buy the device according to its flow rate.

Where can I install it?

Installing the tankless heaters for sinks and baths is easy. The best place for installation is the sink or shower, where you require hot water. There are point-of-use water heaters that can connect directly with a sink. So, you can have hot water at the faucet you want. There is compatibility to install under the sink. Thus, you can either mount it on a wall or use it under the sink. It is best to install it near the cold water pipe and a wall socket.

What features should I look for in a tankless water heater?

Most of the water heating devices come with up to a 6-year warranty. The warranty of leaks and parts ensures that it is durable. Also, it will have better quality parts. Another feature to look for is the digital temp display. Not all of the heaters have it, but it’s convenient. Some of the heaters have self-modulation technology and up to 6 safety protections. Thus, it is better to buy the one with as many safety features as it can have. Another feature to look for is the waterproof rating. If it comes with an official waterproof rating, it is of high quality.

Is there a need for maintenance?

Most of the tankless water heaters running or gas or electricity do not require maintenance. You can check for any water leaks or issues once a year. All of the heaters come with warranties for the leakages. Also, there are some with up to a 2-year warranty for the parts and services. So, if it fails, you can claim a warranty for fixing it. Regular checking ensures that it will work for many years.


Frequently Asked Questions (FAQs)

What is the best flow rate for a tankless heater for faucets?

Most of the 120V water heaters can deliver a 0.5 to 2.5 GPM flow rate. Thus, the one with the highest flow rate is better.

Can a 120V tankless heater operate on 110V?

Yes, the 110V and the 120V are compatible with them.

Are there any power requirements for a 120V water heater?

Most tankless heaters need at least 120 amps. Also, the average capacity of a household is 200 amps. So, you can upgrade. The 110V or 120V water heater requires a 20 amp or a 30 amp circuit breaker with a 120V power socket.

How many watts will a 120V water heating device consume?

A 120V heater consumes 3.5KW to 7.5 KW.



You can save a lot on electricity costs by installing the best 120V tankless water heater. It provides hot water on demand instantly to one or two sinks. That is why it will not waste energy. Most of these water heating devices are budget-friendly and best for tiny homes and apartments. You can also install it for the office, shops, RVs, and boats. It requires a 120V power socket and a cold water inlet. We have the best seven suggestions that are popular among the buyers. Also, you can refer to the buying guide for information.

Leave a Comment