Best Electric Tankless Water Heater Reviews

You, and everyone else, need a water heater. The tool is the best when it comes to helping you feel relaxed and comfortable. Tankless water heater is perhaps the most preferred of it all these days seeing that the absence of a tank makes it rather versatile and requires a containing medium of sort. The water can be heated pretty instantaneously without it having to accumulate first inside a tank.

The question that needs an answer would be how you can find the best electric tankless water heater. This problem can be solved by looking into several steps that may lead you to the one product to feel happy about.

First, you need to see figure out the number of devices to run at max and the total flow rate of all those devices. Next, throw the gallons-per-minute measurement in the mix, that is, their flow rates.

Second, figure out the temperature rise that is required. In order that you can determine this, you should take the temperature of the incoming water first out of the output temperature that you desire.

Lastly, measure the size. At average, a shower should be suitable for about 2.6 gallons of water at a range of 104-106 degree. As a guide, below are some of the best tankless water heaters you can choose.

Top 5 Best Electric Tankless Water Heater

Stiebel Eltron Tempra Plus 36 KW Reviews – King of electric tankless water heaters

Tankless water heaters have become all the rage in house-heating business. This variety of heaters can help you cut your energy bills while at the same time allows you to enjoy hot water without any kind of limitation whatsoever. Water heaters that are powered with electricity have become the favorite as they can help users meet their needs with added values of flexibility and durability.

Many makers out there have attempted to create tankless water heaters that can meet the needs of a lot of customers in satisfying manners. The Stiebel Eltron Tempra Plus 36 KW should be considered a perfect example of this so called the King of Electric Tankless Water Heaters. The unit is perfect for houses of big sizes, which consequently require hot water a lot more than smaller ones.


The unit comes with ergonomic design. With a dimension of 4.6 x 16.6 x 14.5 inches and a weight of 22.9 pounds, the unit should be considered compact and lightweight. Compared to other conventional units, this water heater takes up less space in terms of installation. It can be installed under the sink, placed in the cabinet, or mounted on a wall. Venting is not necessary with this unit. The unit is excellent in its performance of meeting your need for hot water. A technology is embedded in the unit to help reduce the consumption of energy by until 20%.

The efficiency rate of this unit’s use of energy reaches almost 100% being backed up by said technology. The process of the installation is pretty easy. The maker includes a manual for users to follow in detail to help with the installation process. The unit comes with 3 heating modules, which make it all the more suitable for use in a big house. Flexibility is further enhanced with the inclusion of a digital display for the temperature and a dial selector for choosing temperature rate.


Stiebel Eltron Tempra Plus 36 KW, as per the confession of some consumers, is pretty expensive. However, when compared with the features it comes with, the unit will make for a great investment on your part. Your initial expenses should be returned in such a short time after purchasing this unit. Another downside of this unit is its requirement for 3 amp breakers. You would need a large panel space just to accommodate amp breakers this many. You can simply adjust the panel for the purpose of accommodating the breakers but that will also mean extra costs in return. Some users have also reported that the unit does not work properly whenever cold water is coming in. Therefore, it also means that the unit would perform better when used in regions with warmer climates.


All in all, despite its cons, the unit is still worth the money you spend for it. This is especially true when it comes to meeting the needs of hot water supply in a large house. Its large energy requirement might come as a turn-off but you surely will not be short on hot water supply.

EcoSmart ECO 27 Reviews – Best medium size water heater

EcoSmart ECO 27 comes with a design that is compact, which makes it perfect for saving up to 12 cubic feet of storage space. A small house may feel the benefit of the inclusion of wall-mounting feature, which allows the unit to be installed on a wall, leaving the rest of the room unoccupied. Furthermore, the unit is embedded with a patented self-modulating technology.

The inclusion of this technology makes it possible for the machine to automatically adjust the input of energy that is desired based on the amount of hot water required. The unit is constructed out of copper and stainless steel materials, which in turn give you excellent durability and better performance. The presence of self-modulating also makes for a great way for you to save energy. The unit automatically reduces the flow of hot water when the water that goes in is very cool. It also comes with a device to control temperature remotely.

This way, you can manipulate the range of the temperature without having to be close to the unit. The unit offers an efficiency percentage of energy usage for up to 99%. With this, EcoSmart ECO 27 can save maximum energy requirement and takes down at least 50% of energy bills for heating up the water. The unit is constructed out of stainless steel and copper-based materials. The result of this is that you can expect a better factor of durability.

The unit will heat up the water coming in through an inlet pipe up to a temperature of 140 degree F. The unit is perfect for use within a house that is in need of hot water aplenty. Its small build helps anyone with limitation in terms of space in their home as it does not take too much space for proper installation.


It offers an efficiency rate of 99%. The unit comes preinstalled with a technology of self-modulating to control the temperature of the water going in. Heating costs can be put in check while hot water is going to be present without a stop. You can always enjoy using hot water whenever you feel like to. A digital remote control device can help with adjusting temperature from afar. The unit is offered with a warranty period of a lifetime. The unit can be easily operated and comes with excellent durability.


The maker of the unit does not provide labor services for free. Plus, there would be a slight delay before you can enjoy hot water.


This tankless water heater makes for a great addition to your home with its attractive extraneous esthetics. Its patented self-modulating technology will help you save more on energy bills. Those residing in regions that are of colder climate can benefit very well from this unit. At the efficiency rate it is, you can ultimately save money, space, and energy using the unit. The remote control device is certainly a great added value as you can enjoy adjusting the temperature range remotely without hassles.

Bosch Tronic 3000 T Reviews – Good mini water heater

Bosch Tronic 3000 T is both compact and lightweight. This makes installing the heater an effortless endeavor. On the inside, the heater is lined with glass while on the outside it is pretty to look at. A tank that is lined with glass makes for a well-insulated tank. Using this heater, there is no need for long waits as it comes with a fast recovery rate. Safety is assured with its valve for relieving pressure and controlling temperature.

The unit weighs about 19.7 pounds, making it a pretty lightweight stuff that requires no time and effort to install. Plus, its small size will also allow for installation on pretty much any kind of surfaces you would love it to stand. As it does not take too much space, it is possible for you to mount it on a wall, place it over a floor, or placed on a shelf. It can even afford being placed inside a cabinet.

Durability-wise, the heater is effective in its use of energy. Temperature is controlled using an external dial. It has a satisfactory capacity to hold up to 2.7 gallons of hot water. With this size, it can serve a house with 2 bathrooms at once. Being lined with glass on the inside (plus a foam insulation that is CFC-free), the heater assures long usage life.

These features help the unit to retain heat longer; as such, it can use energy to heat up the water more effectively. You can say goodbye to having to wait for a long time for the water to heat up and ready for use.


Bosch Tronic 3000 T is the smallest in the Tronic 3000 T family. The unit can be plugged into an outlet of 120 volt. The presence of an external digital dial makes it easy to operate and safe for use as well. Use the dial to control the range of the water temperature. What’s even more interesting is the fact that the unit can heat up water within less than 10 minutes. The look is attractive and sleek, eliminating the risk of it being out of place among other fixtures and features of the room it occupies.


The unit is somewhat large with a dimension that can fit 2.5 gallons of water.


You can depend on this water heater for every purpose you have. The large dimension of the unit is pretty perfect for serving a house with up to two bathrooms all at once. While it seems to be huge in a way, it is not that big so much that it looks clunky and awkward the way traditional water tank heaters do. Its external esthetics makes for a seamless integration with its surroundings.

The only thing that seems to be inferiority with this unit is that if you place it inside a cabinet, water may fall off of it, making a mess everywhere. One solution to handle this matter is to connect the unit to a drain using PVC pipe. This way, the overspill may go directly and safely out of the bathroom.

Stiebel Eltron Tempra Plus 24 kW Reviews – Best budget water heater for large house

As technology advances by the day, the world sees a decline in the usage of tank water heaters, especially within the period of last few decades. The reason behind this is the fact that tank water heaters are bulky in their build while their performance is not all that optimal to be honest. With the rise of tankless water heater, people can today save more in terms of money, space, and energy.

Stiebel Eltron Tempra Plus 24 is the perfect example of an efficient water heater that allows for effective placement and installation, efficient energy use, and a chance of cutting energy bills. For the purpose of conciseness and straightforwardness, this piece will merge the factors of features and pros of the unit while setting aside the cons part for later section.

Features and pros:

The unit weighs about 20.5 pounds with a dimension of 4.6 x 16.6 x 14.5 inches. At this dimension, the unit is presented in a build that is compact more than other conventional models of water heater. The maker is kind enough to include wall mounting features so users can place the unit on a wall pretty conveniently. Being able to be installed on a wall allows the unit to free up some space on the floor for you. The unit is also pretty lightweight, making it perfect for fitting on any locations.

Esthetically speaking, the unit is housed within a coated steel casing in a design that is pleasing to the eye. The unit performs pretty efficiently with its temperature control that is precise. The unit is capable of working for incoming preheated water and cold water just the same and heat any of them up to 131 degrees F.

The maker embeds a microprocessor technology that helps make sure that the user puts the temperature at the right range: between 86 and 140 degrees F. The temperature will be at the steady rate all the time because the unit modulates its power. The unit heats up water gradually as the heating process is done in stages.

Stiebel Eltron Tempra Plus 24 is durable and can function for a quite long time. The construction has a lot of things to do with this unit’s excellence in durability. The unit is encased in a stainless material that is pretty to look at while at the same time provides some sort of sturdiness. In addition to this, the maker also slips out a warranty that lasts for 7 years specifically for leakage of any sort and another warranty for 3 years for the parts.


To keep the unit running, you will require tons of power. The unit is perfect for homes that are equipped with 60-amp circuits.


All in all, the unit is lightweight with a performance that is optimal and durable as well as dependable. Additionally, the unit comes with a low noise technology that assures an experience that is unmatched. In short, the tankless water heater unit would be sufficient for meeting your requirements for hot water.

Rheem RTEX-18

A dependable water heater should be tankless and efficient in its use of energy. It should also be able to supply users with an endless supply of hot water that flows continuously, fast and on-demand for any single point of usage such as bathroom, sinks, or showers, as well as other applications. Per this definition, the Rheem RTEX-18 should be considered perfect as it meets all the requirements and conditions. It is capable of supplying you with an endless flow of hot water pretty instantly in a way that is efficient in its energy use, even for a house with up to two bathrooms.

This tankless electric water heater is also perfect for use in any other environments such as mobile homes, travel trailers, campers, and RVs. The unit is compact in design, allowing it for installation in a variety of environments despite its tiny build. It is also environmentally friendly as it can save more on energy and water usage. Its compact build also means that it is suitable for installation under the counters of a bathroom or a kitchen or under a sink.

The unit comes with two heating elements that are encased in strong copper material. The unit comes with an external digital thermostatic control that is equipped with an LED display. The unit is reliable for supplying you with endless flow of hot water. It is easy to install and simple to replace. The operation is
also pretty straightforward.


Rheem RTEX-18 is easy to install. Even a layperson can do it all on their own. You will not have to allocate a special space to accommodate this unit as it is designed in a compact build that makes it easy for users to place it anywhere they feel like to

It comes with a dimension of 4 x 15 x 19 inches, which makes it pretty mall, allowing for installation even in a tight space. Its appearance is pretty to look at, merging flawlessly and seamlessly with its surroundings whatever the interior design might be.

The unit is paired with a digital temp control. With this control, you can adjust the water temperature in increments of 1 degree F within a range from 80 to 140 degrees F. The unit is 99.8% energy efficient. This means that the unit can help put that electrical bill in check.

The unit generates up to 4.4 GPM based on the temperature of the incoming water. This should be enough for simple dish washing and some showers as well.


As per some reviews from some consumers, the unit’s LED dimmable light bulbs start to flicker every time the heater connects. This problem seems to be able to be resolved by simply installing the glowing bulbs.

But, problems with other parts might have to do with the draw on the electric power. You may want to upgrade your less than 200 amp service before being able to support the function of the unit properly.


The unit is an excellent tool for houses with average requirements of hot water efficiently.