I Tested And Reviewed 8 Best Electric Tankless Water Heater (2023)
Looking to upgrade your old water heater to a more efficient electric tankless model? With so many options on the market, it can be tricky to determine which is truly the best electric tankless water heater for your home. Before making this important purchase, there are a few key factors you'll want to consider.
First, examine your household's hot water usage. Do you need a unit that can handle just one sink and shower at a time, or do you have a large family that needs simultaneous hot water access? Understanding your home's requirements will help narrow your search. Next, think about your available space. Tankless heaters are compact but do require some wall clearance. Measure to ensure the model you select will fit.
You'll also want to look at the unit's power specifications. To reach optimal temperatures, electric tankless heaters require a large amperage draw. Check your electrical panel to see if an upgrade is needed. For cold climate locations, be sure to get a unit rated for higher flow rates which compensate for ground water temperatures. Finally, features like WiFi monitoring, temperature adjustment and recirculation pumps add convenience but increase costs. Weigh which are most useful for your situation.
Still unsure which is the best electric tankless water heater for you? Would you benefit from going tankless or should you stick with a conventional model? What maintenance requirements or costs are involved? Get the answers to these questions and more with our in-depth electric tankless water heater buying guide designed to help you make the ideal choice for your home.
8 Best Electric Tankless Water Heater
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The product is ideal for providing endless on-demand hot water for sinks and faucets, while saving energy.
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The product is ideal for efficiently providing hot water without the need for a tank, saving space and energy.
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The product is ideal for providing hot water on demand in smaller spaces.
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The product is ideal for providing instant hot water at a specific point in your home or small space.
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The product is ideal for providing instant hot water in homes, kitchens, and bathrooms with automatic control and self-test functions.
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The product is ideal for providing instant and continuous hot water in residential homes for showers and other purposes.
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The product is ideal for providing instant hot water on demand for faucets with smart control capabilities.
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The product is ideal for providing hot water on demand for residential or commercial use.
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1. Airthereal Evening Tide Electric Tankless Water Heater: On-Demand Luxury
I recently had the opportunity to try out the 18k Evening Tide tankless water heater in my home, and I must say, it has been a game changer for me and my family. As a handyman by trade, I found the installation process to be simple and straightforward after reading the owner's manual. It did take a few hours to complete the necessary wiring and plumbing, but that was expected when relocating my hot water heater from the basement to the main floor utility room.
Unfortunately, I did encounter an issue with the original unit that I received. In hindsight, it seems that the unit may have been faulty straight out of the box, possibly due to mishandling during shipping. It worked fine for the first two weeks before suddenly failing. Being my first experience with a tankless water heater and not having anyone I knew who had used one before, I initially didn't realize that something was wrong. I was a bit concerned when I discovered that the customer service line was only open from 12-4 EST, but I soon learned that I could email them outside of those hours and they would typically respond. Given that they are a smaller company, I understood the limited customer service availability. Following their instructions, I provided them with some videos and additional information, and they promptly issued a replacement.
To my surprise, exactly one week after contacting the company, I received the replacement unit and was able to easily swap it out myself. The process took around 30 minutes, including turning off and on the breakers in the basement. I believe even my 10-year-old could have done it with some guidance. Upon using the replacement unit, I immediately noticed a significant improvement in its performance compared to the original. It goes into standby mode when hot water isn't running, which makes perfect sense. It's important to note that if you see an EF code when there's no water running, it doesn't mean it's energy efficient; it simply indicates that there's no water flow.
I wanted to provide an update on my experience with the new unit after three months of use, and I am beyond pleased. I can now run a bath while the shower is running, and there is never a shortage of hot water. The only minor issue I have encountered is that if the hot water is only run for a brief moment (a matter of seconds), the unit beeps because there is no water flow to cool the jets. However, this is not actually a flaw but rather the way the unit operates. Simply running the hot water for at least 30 seconds resolves this. Overall, I am absolutely in love with this purchase and highly recommend it.
2. Bosch Thermotechnology Tronic 4000 Electric Tankless Water Heater, 6.5 Kw, 13 X 8.5 X 4.5", White
The Bosch point of use tankless water heater is a highly efficient unit, perfect for small spaces such as a sink. With its 6.5kw power and 240V voltage, it delivers reliable performance. However, it is important to note that installation may require additional expenses, including a dual pole 30 amp breaker and 10g wiring, amounting to around $200 or more if the area is not already set up for a tankless water heater.
This unit is designed for point of use applications and is ideal for a sink. While it may be able to handle a single shower in a pinch, its size may make it inadequate for larger demands. It can provide a maximum temperature rise of 35 degrees at a flow rate of 1.26 gallons per minute, with a minimum water flow of 0.55 gallons per minute to activate.
Installation can be done by individuals with basic electrical and plumbing knowledge, making it a feasible DIY project. However, it is important to consider water quality, as poor water quality can decrease the lifespan of the heater's components. The tank's 360-degree orientation mounting is convenient, but it is recommended to leave clearance around it for easy servicing in case of any issues. Adding a shut-off valve before the unit is recommended for easy shut-off in case of leaks.
3. Bosch Thermotechnology Tronic 4000 Electric Tankless Water Heater, 8.5 Kw, 13 X 8.5 X 4.5", White
The Bosch 6.5kw Point of Use Tankless Water Heater is an efficient option for small-scale use, such as a point-of-use sink. With a power output of 6.5kw and a voltage of 240V, this unit requires a dual pole 30 amp breaker and 10g wiring for installation. Please note that if the area is not already set up for a tankless water heater, you may need to spend at least $200 on additional parts for installation.
Due to its size, this tankless water heater is ideal for a sink, and in some cases, it can handle a single shower in a pinch. However, I would not recommend relying on it as a primary water heating source for larger applications. Its maximum capability is a 35-degree temperature rise at a flow rate of 1.26 gallons per minute, with a minimum water flow requirement of 0.55 gallons per minute.
Installing the Bosch 6.5kw Point of Use Tankless Water Heater yourself is possible if you have basic knowledge of electrical and plumbing work. However, it is important to consider the quality of your water, as poor water quality can shorten the lifespan of the heater's parts. The tank features a convenient 360-degree orientation mounting, but it is recommended to leave clearance space around it (6 inches on the front and sides, and 12 inches on top and bottom) to allow for easy servicing if any issues arise.
I would recommend installing a shut-off valve right before the unit so that in the event of a leak, it can be easily shut off directly at the unit. Overall, this tankless water heater is a great option for a point-of-use application, but it does require some basic electrical and plumbing knowledge for installation. Additionally, additional parts may be needed for installation.
Many users have found the Bosch 6.5kw Point of Use Tankless Water Heater to be easy to install and operate. Its solid construction ensures durability, and it heats water quickly and evenly. The temperature is just right, making it a convenient choice for your hot water needs. Its compact size also allows for easy fitting underneath a sink or in other tight spaces.
One customer mentioned using this water heater in their shop, where they wanted hot water without the cost and maintenance of a conventional water heater. They found this tankless water heater to be an excellent solution, as it is small and easy to install. It is even visually appealing, making it suitable for visible installations. The customer also mentioned that the Bosch brand is trusted and that they are extremely satisfied with their purchase.
4. Ecotouch 240v Tankless Electric Water Heater
After reading various reviews about this heater, I can confidently say that it is a reliable and efficient choice for your shop sink. Let's start by addressing some misconceptions that have been mentioned in previous reviews.
First, the water connections. The connections are 1/2 npt, which is the same as those found on 1/2 galvanized pipes and common faucets. This makes it easy to find compatible fittings and hoses. While there might be a need for a 1/2 brass coupling and nipple on the hot outlet side due to a restrictor, there are hoses available that will work with this setup. Although they might not be as common as the 3/4 water heater hoses, they are still readily available.
Moving on to the electrical connections, they couldn't be simpler. The heater requires a standard 220V setup with two hot wires and a ground. Most DIYers will have no trouble handling this installation, as it only involves connecting the white, black, and green wires. It's important to note that if one struggles with this basic installation, it's unlikely they would fare any better with any other heater. In such cases, seeking the assistance of a professional plumber would be wise.
Now, let's discuss the performance of the heater. The heat output is impressive, providing hot water for your sink, and it could potentially work for a shower as well, despite the manufacturer's recommendation against it. However, it's worth mentioning that the temperature may vary depending on the ambient temperature. While it might not be as hot during colder months, it will still be significantly better than the ice-cold water experienced in previous winters.
In terms of build quality, the unit appears to be sturdy and well-made. It doesn't have a cheap or fragile feel, contrary to initial concerns. The wires are copper, and the overall construction instills confidence. It is heavier than expected, further indicating its durability. Additionally, the company's commitment to customer satisfaction is evident from their responsive approach to customer reviews. This level of dedication is increasingly rare nowadays.
To summarize, this heater is not only easy to install but also of good quality. It offers excellent value for your money, outperforming more expensive alternatives according to the positive reviews it has received. Although I cannot comment on its longevity, all indications point towards it being a reliable investment. Considering its affordability, quality, and positive customer experiences, I believe this heater is an excellent choice for your shop sink.
5. Smartflow Electric Tankless Water Heater
The JHiveGym Tankless Water Heater is an excellent choice for various applications, including pot fillers and teardrop camper builds. Its versatility allows users to adjust the power level of the water heater by simply holding the on/off switch for 6 seconds. With five different power levels available, ranging from Type 1 at 1100W to Type 5 at 5500W, you can easily find the perfect setting to suit your needs.
One of the standout features of this water heater is its ability to operate efficiently, even on lower power levels such as Type 1 or 2. This means that you can enjoy hot water without draining your battery excessively, making it an ideal option for mobile setups like teardrop campers. Additionally, the temperature of the water can be easily changed, allowing you to customize it to your preference. It's worth noting that the water can get hotter than necessary, but a quick conversion from Celsius to Fahrenheit can help you find the perfect temperature for your needs.
Installation of the JHiveGym Tankless Water Heater is straightforward and hassle-free. The unit itself is well-built, providing you with peace of mind that it will last for years to come. With all these features and benefits, it's no wonder that this water heater has received a well-deserved 5-star rating.
6. Thermomate 27kw Electric Tankless Water Heater – Instant Hot!
I recently installed this water heater and I am extremely impressed with its performance. It replaced my previous unit that caught fire after just over a year of use. Despite being a lower wattage than my previous heater, this unit outperforms it in every way. The temperature is consistent, and it heats up much faster. I live on a small farm with well water, and this water heater doesn't seem to be affected by pressure loss or cold water. It simply does its job without any issues.
The only fault I can find with this water heater is the manufacturer's recommendation of using 12awg wire with the 30 amp breakers. While there are no electrical codes in my area, it is generally not recommended to use 12awg wire. Most inspectors would fail the installation if 12awg wire was used. After my previous water heater caught fire, I decided to err on the side of caution and went with 10awg wire. It's always better to be safe than sorry when it comes to electricity.
The packaging and delivery of this water heater were excellent. It arrived quickly and was well-packaged. As someone who has installed multiple water heaters, I wanted to try this one for myself before recommending it to my customers. The installation process took about 3 hours, including removing the old tank and running the necessary electrical wiring. I also added a sediment filter to help keep the heat exchanger clean, although I plan to install a proper water softener/filter in the near future.
Setting up this water heater was incredibly simple, just like the other units I have installed. The materials used are of high quality, and the settings are straightforward. The digital display shows the current water temperature, and a small red light indicates when it is heating. I also installed an energy monitor to track my usage, and I was pleasantly surprised to find that it consumes very little energy. In three weeks, it only used about 55kWhs in total.
7. Sivuatek Smart Electric Water Heater – Instant Hot!
The XYZ product is a great addition to any household looking for instant hot water at the sink. The installation process is easy and the unit is compact, taking up very little space. The package comes with protective packaging, ensuring that there is no damage during shipping.
One of the standout features of this product is the almost instant hot water it provides. Previously, users had to run water down the drain while waiting for hot water, but with this unit, that is no longer necessary. The water temperature is easily adjustable to your satisfaction, with a simple finger press on the + or – button.
In terms of installation, users may need to purchase an additional valve for dual connection of cold water, but this can easily be found on Amazon. It is important to note that if the power goes out, the unit will stay off, so it is advisable to install it in a location where the front panel is easily accessible for turning it back on.
The mounting process is a breeze, thanks to the included template and brackets. Users have reported no reduction in water flow to the kitchen sink, even at higher temperature settings. However, it is worth noting that initially, hotter water may come out due to residual heat, so caution is advised.
The only downside is that the unit is not recommended for under-sink installations, as the manual advises against installing where water can possibly drip down onto it. This limitation may pose a challenge for some users, but overall, the product delivers on its promise of instant hot water.
8. Rheem 11kw 240v Tankless Electric Water Heater
Rheem is a reputable brand known for manufacturing high-quality water heaters, and this model is no exception. While choosing the right size model can be a challenge, this particular unit is more than sufficient for kitchen sink use and even for a single shower in most regions. However, for whole-house use, a larger model would be recommended.
It's important to note that all tankless water heaters, including this one, require a small amount of water to flow through them before hot water is delivered. So, while it may not provide instant hot water, it is still relatively quick and efficient.
One thing to keep in mind with tankless water heaters is the buildup of calcium over time. This can affect the efficiency of the unit and even impact the sensors. To combat this, it is advised to install service valves, which allow for the periodic flushing of the heater with vinegar or CLR to remove any calcium deposits. This maintenance routine is crucial for the longevity of the unit.
When it comes to installation, it is essential to refer to the manufacturer's instructions and not solely rely on external charts or information. In this case, the install manual stated that a 60 amp breaker and #6 wire are required, contrary to the information provided on the Amazon comparison chart. It's fortunate that the wiring was not installed before discovering this discrepancy.
The unit itself was well-packaged and sealed upon arrival, although there were water droplets inside the inner bag. It is unclear whether this was due to testing or any external factors, but there was no sign of water damage on the outside of the box.
In terms of installation, the included adapters were found to leak. Despite trying different types of Teflon tape and thread sealant, the issue persisted. However, using a compression fitting for 1/2 copper, along with two wrenches for proper tightening, resolved the problem. The reviewer also opted for copper to pex pipe with a shark bite coupling, which eliminated any further leaks and ensured the unit worked flawlessly.
FAQs
Are electric tankless water heaters more cost-effective than traditional tank water heaters?
Electric tankless water heaters can be more cost-effective than traditional tank water heaters in certain situations. One of the main advantages of electric tankless water heaters is that they only heat water on demand, eliminating the need to constantly heat and store a large volume of water like traditional tank water heaters.
This can result in significant energy savings, especially if you have a high hot water demand or if your household has periods of low hot water usage.
However, it's important to consider the initial cost of purchasing and installing an electric tankless water heater, as they can be more expensive than traditional tank water heaters. Additionally, the electrical requirements of tankless units may necessitate upgrades to your home's electrical system, adding to the overall cost.
To determine the cost-effectiveness of electric tankless water heaters for your specific situation, it's recommended to consider factors such as your hot water usage patterns, energy costs in your area, and the lifespan of the unit.
Consulting with a professional plumber or conducting a cost analysis based on your specific circumstances can help you make an informed decision.
Are there any maintenance requirements for electric tankless water heaters?
Yes, electric tankless water heaters do have maintenance requirements. While they generally require less maintenance compared to traditional tank water heaters, it is still important to ensure their efficient operation and longevity.
One of the key maintenance tasks is descaling the unit, especially if you live in an area with hard water. Over time, mineral deposits can build up inside the heating element, reducing its efficiency. Regular descaling using a descaling solution or vinegar can help remove these deposits and keep the heater functioning optimally.
Additionally, it is recommended to clean the inlet filter periodically to prevent any debris or sediment from clogging the system. This can be done by shutting off the water supply, removing the filter, rinsing it under running water, and then re-installing it.
It is also important to check the manufacturer's guidelines for any specific maintenance requirements or recommendations for your particular model. Following these guidelines will help ensure the longevity and efficient performance of your electric tankless water heater.
Are there any specific electrical requirements for installing an electric tankless water heater?
Yes, there are specific electrical requirements for installing an electric tankless water heater. These requirements ensure that the heater functions safely and efficiently.
Firstly, you will need a dedicated electrical circuit for the tankless water heater. This means that the heater should have its own circuit and not share it with any other appliances. The circuit should be properly sized to handle the electrical load of the heater.
Secondly, the electrical supply for the tankless water heater should meet the voltage and amperage requirements specified by the manufacturer. It is important to check the specifications provided by the manufacturer to ensure that your electrical supply meets these requirements.
Additionally, it is recommended to have a qualified electrician install the tankless water heater to ensure proper wiring and adherence to local electrical codes and regulations. They will also be able to determine if any upgrades to your electrical system are required.
Overall, it is crucial to follow the specific electrical requirements provided by the manufacturer to ensure safe and efficient operation of the electric tankless water heater.
Can an electric tankless water heater provide hot water to multiple fixtures simultaneously?
Yes, an electric tankless water heater can provide hot water to multiple fixtures simultaneously. However, the capacity of the water heater will determine the number of fixtures it can serve at once. Each electric tankless water heater has a maximum flow rate, measured in gallons per minute (GPM), which indicates the volume of hot water it can produce.
To determine if a particular unit can handle multiple fixtures simultaneously, you need to calculate the total flow rate of all the fixtures you intend to use at the same time. If the total flow rate is within the capacity of the water heater, it will be able to provide hot water to all fixtures.
It's important to consult the manufacturer's specifications and consider the hot water demands of your household to ensure you choose an electric tankless water heater that meets your needs.
How does an electric tankless water heater work?
An electric tankless water heater operates by directly heating the water as it flows through the unit, without the need for a storage tank. When a hot water tap is opened, cold water enters the unit through an inlet pipe.
Inside the heater, electric heating elements, usually made of copper or stainless steel, heat the water rapidly using electricity. The heated water then flows out of the unit and through the hot water pipe to your faucet or shower.
To regulate the temperature, tankless water heaters are equipped with a flow sensor that detects when hot water is needed. Once the flow sensor is activated, the heating elements are automatically turned on and begin heating the water.
The heater will continue to heat the water as long as the hot water tap remains open.
The main advantage of an electric tankless water heater is that it provides hot water on demand without the need for a storage tank, eliminating the standby heat loss associated with traditional tank heaters.
However, it's worth noting that electric tankless water heaters may have limitations in terms of the amount of hot water they can provide simultaneously, so it's important to choose the right size unit for your needs.
How long can an electric tankless water heater provide hot water before it needs to recharge?
The duration of hot water supply provided by an electric tankless water heater before it needs to recharge can vary depending on several factors. One key factor is the flow rate or water demand. Higher flow rates will deplete the hot water supply faster, while lower flow rates will allow for a longer duration of hot water availability.
Additionally, the power rating of the water heater plays a role in determining the recharge time. Higher power ratings generally result in a faster recharge time, allowing for more consistent hot water supply. It is also important to consider the incoming water temperature.
Colder incoming water requires more energy to heat, which may impact the duration of hot water supply. To determine the specific duration of hot water supply for a particular electric tankless water heater, it is recommended to refer to the manufacturer's specifications or consult with a professional plumber.
How much energy does an electric tankless water heater consume?
The energy consumption of an electric tankless water heater depends on several factors such as the desired water temperature, flow rate, and the efficiency of the unit. Generally, electric tankless water heaters have a higher energy consumption compared to their gas counterparts.
To determine the energy consumption, you need to consider the power rating of the unit, measured in kilowatts (kW). For instance, if the unit has a power rating of 10 kW and it operates for an hour, it will consume 10 kilowatt-hours (kWh) of energy.
It is important to note that the actual energy consumption may vary depending on the usage patterns and the temperature of the incoming water. Additionally, some electric tankless water heaters are equipped with energy-saving features like modulating elements or smart controls, which can help optimize energy usage.
To get a more accurate estimate of the energy consumption of a specific electric tankless water heater, refer to the manufacturer's specifications or consult with a professional installer.
What are the benefits of using an electric tankless water heater?
There are several benefits to using an electric tankless water heater.
Firstly, they are highly energy efficient. Unlike traditional tank water heaters that constantly heat and store water, tankless heaters only heat water on-demand. This means they only use energy when hot water is needed, resulting in significant energy savings and lower utility bills.
Secondly, electric tankless water heaters provide endless hot water. Since they heat water as it flows through the unit, there is no need to wait for a tank to refill or worry about running out of hot water during a shower or bath.
Thirdly, tankless water heaters are compact and can be installed in small spaces. This makes them ideal for apartments, condos, or homes with limited space.
Additionally, electric tankless water heaters have a longer lifespan compared to traditional tank heaters. With proper maintenance, they can last up to 20 years, which is significantly longer than the average lifespan of a tank water heater.
Lastly, electric tankless water heaters are environmentally friendly. They produce fewer greenhouse gas emissions compared to tank heaters, reducing their carbon footprint.
Overall, electric tankless water heaters offer energy efficiency, endless hot water, space-saving design, durability, and environmental benefits.
What are the common issues or problems that can occur with electric tankless water heaters?
There are a few common issues or problems that can occur with electric tankless water heaters. One of the most common issues is inadequate water temperature. This can be caused by factors such as incorrect temperature settings, a malfunctioning thermostat, or even a low water flow rate.
Another issue that can arise is mineral buildup or scaling, especially in areas with hard water. This can lead to reduced efficiency and even damage to the heating elements. Additionally, electric tankless water heaters may experience problems with power supply, such as inadequate voltage or a tripped circuit breaker, which can result in a lack of hot water.
Lastly, improper installation or sizing can cause issues, as these units require sufficient electrical capacity and proper plumbing connections. It is important to consult with a professional during installation to avoid these problems.
If you encounter any of these issues, it is recommended to contact a qualified technician to diagnose and resolve the problem.
What size electric tankless water heater do I need for my household?
To determine the appropriate size of an electric tankless water heater for your household, you need to consider a few factors. Firstly, calculate the peak hot water demand in your home. This can be determined by identifying the number of fixtures or appliances that may be used simultaneously, such as showers, faucets, and dishwashers.
Next, check the flow rate of each fixture or appliance. This information is usually labeled on the equipment or can be found in the manufacturer's specifications. Add up the flow rates of all fixtures that may be used simultaneously to determine the peak hot water demand in gallons per minute (GPM).
Once you have the peak hot water demand, choose an electric tankless water heater that can meet or exceed that demand. Electric tankless water heaters are typically rated in terms of GPM, so select a model that can supply the necessary GPM for your household's needs.
It's also important to consider the temperature rise required in your area, as colder regions may require a higher GPM rating.
Lastly, ensure that your household's electrical system can support the power requirements of the chosen electric tankless water heater. Consult an electrician if you have any doubts or need to make any necessary electrical upgrades.
