Best 110 Volt Tankless Water Heater-Top Mini Tankless in 2021

There are some specific needs for which people look for the best 110 volt tankless water heater. Suppose you already have a high flow rate water heater in your home which can be either tanked or tankless. Your main heater is not good enough to support your kitchen sink. Therefore, you might need a water heater only for your kitchen sink. There might be a hot water need for only your bathroom. This is very sure that the 120 volt mini tankless water heater can not support you much. It can only cover one faucet at a time. Unfortunately, we have tried to find out some good 110V low capacity low budget tankless water heater but found very few good options.

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Best 110 volt tankless water heaters – Top Pick

  1. Stiebel Eltron 074050 120V – Editor’s Choice
  2. Ecosmart POU 3.5 – Most Popular
  3. AB Crew Kitchen Faucet – Best for Single Faucet
  4. Sio Green IR30 v2 POU – Best For RV
  5. Chronomite SR-30L/120 HTR – With Microprocessor


ModelsStiebel Eltron 074050Ecosmart POU 3.5 PointAB crew kitchen faucetSio Green IR260Chronomite SR-30L
Power3KW3.5 KW2.5 KW3.4 KW3.6 KW
Temp. Range (fahrenheit)86F to 140F140F Maximum86F to 140F77F to 140FNot Speified
Max. Flow rate1.14 GPM0.85 GPM0.8 GPM0.8 GPM0.5 GPM
Dimension (inch)18.9 x 7.9 x 14.211 x 7 x 2.75N/A14.3 x 12.5 x 4.39.6 x 2.8 x 6.2

Best 110V Stiebel Eltron Water Heater- Editor’s Choice

Stiebel Eltron, the renowned German company that has been accepted by thousands of users as a reliable brand in the field of the water heater. 074050 DHC 3-1 is the most popular model of Stiebel Eltron’s DHC series. Including 120V/110V models, 240V models of Stiebel Eltron has been received positive accreditation from many water heater critics. DHC 3-1 is a small capacity low price 120V water heater. This unit is suggested for a single sink or a single point of use.

Key features

  • Size: 18.9 x 7.9 x 14.2 inches
  • Flow rate: 1.14 GPM
  • Temperature range: 86°F-140°F

The features of this 110V unit include the noise reduction system. This model has a hydraulic system inside that ensures a quiet environment when the water heater is in operation. The installation cost of this water heater will be lower than a gas-run tankless or tanked water heater. You do not have to think about setting up the venting line. Another advantage is the lower power consumption: Rated power consumption of this machine is 50% less than the traditional water heaters. Therefore, it’ll be cheaper to operate. Among the 120 volt tankless water heater models, this machine has the maximum flow rate which is 1.14GPM.

Although it gives you the best flow rate among the small electric tankless water heater, it is still not good enough for the whole house. Therefore, it’ll work best when you connect it with one or two faucets. Because of the lower flow rate, it will not be able to supply hot water properly if connected and used with more than two connections. This equipment is designed for a single point of use. It is perfect for your bathroom sink, kitchen sink, etc. Using it to more than one point might cause overload and ultimately result in not enough hot water.

Overall Stiebel Eltron DHC 3-1 074050 120V tankless water heater is at the top of our list as single point on-demand water heater. The disadvantages of this unit are very common for a low budget and low capacity model. These models will give you a lower flow rate, but at the same time, will consume less electricity.

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Most Popular 110V Ecosmart POU 3.5

Ecosmart POU 3.5 is the single point of use tankless water heater model of the renowned brand Eosmart. Among so many ranges of water heater available, POU 3.5 is the low budget and low capacity model offered by the company.

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 monitor the heating condition which we have found pretty cool. Compared to other models, the size of this appliance is relatively more compact. The brand itself is reliable when it comes to consistency and longevity. This can be a good option for your RV if you have sufficient electricity supply. It can be a very good option as an additional water heater if you already have your main hot water supply source.

The flow rate of this machine might not be good enough for more than one point of use. The maximum output is achieved in warmer inlet water. It can provide you 0.85 GPM of output at an input water temperature of 77°F. This flow rate is still not good enough for more than one faucet. If you live in a cold area where you rarely find your inlet water temperature more than 57°F, then you should avoid this one. The reason is that the flow rate of this water heater below 57°F inlet water temperature is less than 0.5 GPM which might be less than the maximum flow rate of your sink. It works better if you have another main hot water source at your home which can not fully support you during pick hours.

From the review of the consumers, what we found is that, there is a misconception about this water heater among them. Many of the users reported that they are not getting a sufficient amount of hot water from this machine. Our argument on this pint is- the manufacturer of this unit serves exactly what they have stated. If your inlet water temperature is low, it is quite obvious that this machine will not be able to provide you even 0.5 GPM water, which is below the capacity that is needed to run a single faucet. Therefore, we suggest you buy this machine only if you think you will not use it to more than one faucet and your inlet water temperature will be more than 57°F.

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Perfect 120V plug in Faucet Heater – A.B Crew

This is a very different kind of water heater which is integrated with a faucet. The heater is inside the faucet and you do not need to set the heater to a separate place.

Key features

  • Flow rate: 0.8 GPM
  • Temperature range: 86°F to 140°F
  • Dimension: N/A

The advantage of this 120 volt faucet water heater includes less activation time. It will take only 3 to 5 seconds to heat the water. The metal of the unit is treated with multiple plating. This makes sure the longevity of the faucet. Besides, the plastic used for this unit is of superior quality to withstand high temperatures. The temperature range of this small water heater is quite wide. The highest temperature you’ll get is 140°F which is equivalent to a big 240V water heater. If you are using a conventional on demand water heater, you had to set it up on your wall which required some space. For this one, you do not need any space to install as the heater is integrated with the faucet. This appliance can save you precious space.

Some electrical requirements might not be fulfilled as per USA standards. This heater is more suitable for a small family. If you want water at full speed, the temperature might need to be compromised. You must need a professional plumber to install the product. Some users reported that you need substantial water pressure to activate during operation.

Overall, if you are living in a small family of two or three, have a little dish-washing or need a supportive add-on toilet faucet heater, then we recommend you this one. If your RV has a faucet and a good electrical connection, we also recommend this product for your RV. But you need to take care of the heating chamber of this small heater. We must not recommend this unit to use in temperature below the freezing point because it does not have any anti-freezing system.

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Best 110V Water Heater For RV – Sio Green IR30 v2 POU

Infrared technology in a water heater is very new and quite uncommon. SioGreen is a popular name in the on demand water heater and their IR30 is a widely known model for the low capacity range. This company has bigger ranges of products in IR technology as well which we have discussed in another article.

Key features

  • Size: 14.3 x 12.5 x 4.3 inches
  • Flow rate: 0.8 GPM
  • Temperature range: 77°F to 140°F

The advantages of this 110v IR water heater include the use of no heat exchanger. Instead, they have come up with new advanced infrared technology to heat the water. Heater with a heat exchanger need to flush regularly. Otherwise, if your water contains higher mineral content, you’ll lose efficiency. Thus, the service life of the machine will be hampered. All the SioGreen IR models do not need to be routinely flushed. It saves you time. It is hard-water resistant. This machine can perform in hard water where other electric water heaters with a heat exchanger will form scale. You are free to set the power consumption from 1 KW to 3.4 KW. There are four different power levels to choose from. It will save some power costs.

However, this unit is suitable for a single faucet which is a common problem for all other 120 volt on demand water heaters. As the flow rate is not quite satisfactory, the distance of the heater and the faucet should be close to get better results.

Overall, comparing with other best 110 volt under sink water heater models, we can conclude that this model is specifically recommended for you if your water contains hardness and you do not like regular flushing. This can be a good option as a booster of your existing tanked water heater. But the final word from us is as usual – know your heater well before making the final decision. Because you’ll not only spend money on it, you’ll invest your precious time as well. You may read our article on this SioGreen IR30 V2 tankless water heater.

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110V With microprocessor – Chronomite SR-30L/120 HTR

Chronomite is made in the USA. Although not that much renowned, the plug in on demand water heater of 120V model has achieved respect from the users due to its performance.

Key features

  • Size: 9.6 x 2.8 x 6.2 inches
  • Flow rate: 0.5 GPM maximum
  • Temperature range: not specified

The advantage of this 110 volt water heater includes the inbuilt microprocessor. This machine is integrated with a microprocessor that controls the output water temperature. First, you need to set a required output. Then the machine will take care of the temperature. The activation time of this unit is only two seconds. Normally, other water heaters in the market have an activation time of about five to six seconds. Electric consumption will be lower as it is a lower flow rate single point-of-use water heater. Among all the best 110 volt plug in tankless water heater models, this is the most compact in size.

However, if you are thinking of using this water heater that will cover the whole of your house, you’re probably taking the wrong decision. This machine can only cover up to 1 faucet at a time. Although none of the best 120 volt tankless water heater models can cover up a whole house. Another drawback is that it is not suitable if you want a very hot water temperature.

Overall, considering the price, this is a good option as a 110 or 120 volt mini tankless water heater. The service is quick and good. For a single point of use, I will say it is perfect.

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120 Volt electric Shower Head Recommendation

First and foremost, you need to know the science before purchasing a 110/120V shower head. You’ll need a water temperature of 100°F-105°F for a comfortable shower with a 1.5GPM water flow. Maximum showers in the market need this much flow rate to run at full speed. If you expect this flow rate at the mentioned temperature you must need a heavy water heater. You’ll not get this much power from the best tankless water heater for shower.

If you still need to maintain your flow rate and want to have a shower at full speed, you’ll have to compromise the temperature. You may get lukewarm water which may not as much hot as you expect. Therefore, before you buy a shower head, you should keep these words in mind. Below are our top picks.

  1. Boccherini 110V Automatic Electric Instant Hot Water Shower Head Heater
  2. ixaer 110V Electric Instant Hot Water Shower Head Heater
  3. iHeat Tankless P FBA Electric Shower Head Heater

110V Electric Instant Water Shower Head – Boccherini

Boccherini is a well-known brand for shower heater producer. For a separate hot water supply for your shower, this product can be checked to identify the suitability of your need.

Key Features

  • Size: 16 x 8 x 4 inches
  • Volt: 110V/ 120V
  • Wattage: 4.32 KW
  • Temperature range: lukewarm

The advantages of this 110V shower water heater include the three preset temperature control options- hot, warm and cold. You can adjust the water temperature as per your requirement. You need to add more or less water into it to get the desired temperature. Auto on and off regulated by the sensor. There is no problem if you forget to turn it off after taking the shower.

There are few disadvantages of this shower-head water heater. You need to cover the exposed wire with caution to minimize the risk of any kind of danger. Therefore, you need a professional electrician to set it up. There is no option to control water temperature precisely. You can not set the temperature to moderately hot. The machine is not able to make the temperature up that much.

Important point to note is that, if you are not living in a cold area and do not expect very hot water to take your shower, then you can buy this showerhead. This machine will not be that much powerful to raise the temperature. You should expect lukewarm water that might be just OK for you. Otherwise, if you want to compare this heater with other products available in the market, you will say that this one is the best in this category.

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120V Tankless Water Shower Head – Ixaer

This product is one of the very few good quality shower heads you’ll find. Below are the key features so that you can justify whether it matches your requirements.

Key feature

  • Size: 11.7 x 9.8 x 6.1 inches
  • Volt: 110V/ 120V
  • Wattage: 5.4 KW
  • Temperature range: Lukewarm

The advantages of this shower head include the easy manual control over water temperature by three preset switches which will provide you the high, low and medium temperature. There is no need for extra piping to set it up. Easy to install. The price of this unit is reasonably low as well. You can return the product if not satisfied within 60 days. It’ll take not more than 1 hour to install.

The flow rate of this unit will not be that much. A higher flow rate might not provide the required temperature. Therefore, this machine is suitable for light use only. A cold region with very low input water temperature is not suitable for this equipment. It will raise the water temperature to a few degrees. Therefore, higher inlet water temperature is required.

Overall, this showerhead is suitable for the place where you do not have the facility to install a tankless water heater. You’ll not get a good flow rate with this one, but it’ll be just OK for you. Considering the price point, you can have a try.

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Electric Shower Head – iHeat P FBA

iHeat Tankless is a reputed brand for shower heater. They have both 110V and 240V models of good quality showerheads. Below is the detailed review of the 110/120V model.

Key feature

  • Size: 10 x 4.2 x 5 inches
  • Volt: 110V/ 120V
  • Wattage: 2.5KW
  • Temperature range: 24°F temperature rise maximum

Where most of the shower heads have three power options, this model has 5 options to choose from. An LED light will indicate the sate of hot water. The design of this machine is patented. It looks unique compared to other similar shower heads in the market. Instead of copper, which is the most efficient metal for a heat exchanger, the manufacturer has used stainless steel.

However, you’ll have to compromise the speed of hot water if you choose this one. At 1GPM speed, it’ll be giving you 24°F of temperature rise. For the cold region, this showerhead might no be performing well.

Overall, like other good quality shower heads we have researched, this product also will be suitable for light to medium use. It has a 240V version which will be stronger and give you hot water even though you are in a cold region. But this 110V mini tankless water heater model is only recommended for 24°F temperature rise maximum.

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How to choose the best 110V/120V tankless water heater – Buying guide


What is your purpose to buy the best 110 volt under sink water heater? We have listed some common use of a mini tankless water heater. Read these out and find out your specific needs. If you want to have support for multiple faucets with your 110V mini tankless water heater, it might not fulfill your expectations. It can not supply sufficient water to a high-speed shower either in most of the cases. Therefore, be confirm whether you need a 110V electric water heater or not. You can also read our article on the features of a 110V tankless water heater.

Know the specification

Is the 110V water heater you are going to purchase capable of serving your purpose? If you intend to buy a tankless water heater for shower, you need to check the maximum flow rate and temperature range. Almost all the 110V electric water heater available in the market can not serve you 1.5GPM flow rate that is necessary to run almost all showers with full speed. Even if some water heater might have a good maximum flow rate but are not be applicable for you because you live in a cold region. A 120V tankless water heater can raise the temperature only a few degrees that might not be sufficient for you.

Find a better alternative

Even if you know your purpose, there might be a better alternative for you. For example, if you are looking for a hot water solution for the faucet of your RV, you do not need to install a full-size water heater for it. There is a water heater in the market which is a faucet that is integrated with a water heater inside. This water heater will save a lot of space in your RV. Most of the people who do not know about it will buy a 110V mini tankless water heater. Therefore, we suggest you find out alternative products that are specific to your needs.

Installation requirement

Make sure about the installation requirement. Some of the best 110 volt under sink water heater models might not be made for only your country. Therefore, the standards of your country might not be followed. We suggest you check whether the machine can fulfill the installation requirements before you purchase it.


In the market, you’ll find some unbranded Chinese products. Among these, few are of good quality. If you decide to buy any of these, ask the seller about the warranty and after-sales service policy. Because of the low price, some products might not cover long term warranty and service.

To know more, read our article regarding considerations before buying a shower water heater.

The utility of a 110V/120V plug in mini tankless water heater

A 110V/ 120V water heater is normally of lower capacity, lower flow rate and hence, the price is cheaper. Due to so many types of water heaters present in the market, people sometimes do not know what kind of on-demand water heater they need. If you have intended to buy this kind of heater, please check whether you have any of the following requirements.

  • Your main water heater can not fully support your whole house. You need a small additional water heater to support your kitchen or bathroom only. Therefore, an under sink water heater may be appropriate for you.
  • You are looking for a compact water heater. A 240 volt tankless water heater looks too big for you. Therefore, a 110 volt mini version would be a perfect choice.
  • You live in a small family; your water consumption is not that much. Therefore, you are looking for a mini tankless water heater.
  • You are looking for the best tankless water heater for camper or hot water for your RV faucet and shower. Your RV has sufficient electricity to support the heater.
  • You need a showerhead for your bathroom. You can compromise the water temperature. Lukewarm water is good enough for you.
  • You need a water heater that is integrated with your faucet.

110v vs 120V: a misconception

You’ll find water heater and other electronic equipment in the market where the rated voltage for the appliance is either 110V or 120V. Sometimes, you might get electronic equipment, where the rated voltage is written as ‘110V/120V’. In fact, 110V or 120V rating is quite the same. In the United States, electricity historically started at 100 volts. With lower electric pressure, the street light was not bright enough. Therefore, the voltage was increased to 110 volts later on.

Presently, according to the USA standard, the voltage is 120V which is variable to 10%. Therefore, you can get the voltage anywhere from 108V to 132V. Manufacturers sometimes write the voltage 110V because they still can not come out of their old habits. Today if you practically measure the voltage, you’ll find it between 110V to 125V.

To know more on this topic, read our article on how you can choose the right voltage of a tankless water heater.


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

The practical answer is ‘No’. A 110V one is a low-price & low-capacity water heater. In most of the cases, you’ll find a 110V tankless electric water heater can barely fulfill the demand of hot water of a single faucet at full speed. Where the 240V water heater consumes 15 to 30 KW current, a 110V water heater needs only 3-5KW to run. Therefore, these water heaters will be less powerful and hence will provide you a lower flow rate. For this reason, you can only use these heaters for one faucet at a time. These are not designed to cover your whole house.

Are 110V and 120V water heaters the same?

These are the same and interchangeable terms. As per the standard of the USA, the voltage of residential electricity is 120V and it is variable to 10%. Therefore, if your device is rated as 110V, it is the same as 120V. For this reason, you’ll find some electric products in the market where the voltage is written as 110V/120V.

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

Recommended for one sink only. As we have mentioned earlier, a 110V electric water heater is not that powerful. Therefore, it might not provide sufficient hot water if you connect and use it for more than one faucet. If fact, you can connect it to multiple faucets, but you cannot run multiple faucets at a time.

What is the difference between a 110V and a 240V water heater?

Water heaters are usually powerful. These consume higher electricity and gives you a high flow rate of hot water. A 240V electric tankless water heater can provide you 6 to 10 GPM of water which is good enough for the hot water need for a medium to a large home. In contrast, a 110V water heater will only provide you 1 to 2 GPM maximum that will run only 1 faucet at a time.

Can I connect a shower with my 110V heater?

You can connect. A shower might need up to 1.5 GPM of water at full speed. Therefore, you need to check the maximum flow rate of the best 110 volt plug in tankless water heater you have purchased. If the flow rate is lower than 1.5 GPM, you may not run the shower at full speed or, may need to compromise the required temperature.

Final Words

People have mixed experiences with the best 110 volt tankless water heater models. We have found that the lack of proper knowledge about what you need and what your heater can serve you, tend to produce dissatisfaction. A 110V water heater must not help you a lot when it comes to producing hot water. At the same time, you have to consider how much money you are paying for this. From our analysis, we can say that the value which you get from a 110V plug in tankless water heater is more than the money you are paying. We always suggest you know your machine properly before you buy it.

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