Best Electric Tankless Water Heater Reviews & Buying Guide (2019)

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Electric Tankless Water Heater

Over the years, the electric tankless water heater has gained popularity. This is due to the ease of installation, the availability of electricity and less cost on installation. A tankless electric water heater is an excellent choice which will save you a lot of money at the same time reduce any carbon footprint and become more environmentally friendly.

In this review you will find the top 10 electric tankless water heater reviews.

Additionally after the reviews there is a buying guide that will go through some of the most frequently asked questions when buying an electric on demand hot water heater and will assist you in identifying whether it is suitable for your family and how to choose the right one for your household.

10 Best Electric Tankless Water Heater

We have selected the top 10 tankless electric on demand water heaters on the market. Our team has taken hours of research and customer feedback to identify the best electric tankless water heater. Our list of best electric tankless water heater is based on renowned brands and high quality models that appealed to a lot of people.

We gathered customer feedbacks, searching for clues that revealed utmost satisfaction before making our choice. We made customers like you our basic criteria of selection.

No matter what size household you have and what type of electric tankless hot water heater you need we got you covered.

Whether you need it for single point of use, multiple point of application or for your whole household we have selected the top choices in the market so you will be able to choose one that suits your household.

We have gone as far as providing indoor and outdoor options swell to cater for your household.

Comparison Table Of Top 10 Tankless Water Heater Electric

Name Rating Prices Application Location
EcoSmart ECO 27 4.1 out of 5 stars (4.1 / 5) CHECK PRICE ON AMAZON Whole house Indoor
Stiebel Eltron 224199Stiebel Eltron 224199 240V 4.4 out of 5 stars (4.4 / 5) CHECK PRICE ON AMAZON Whole house Indoor
Stiebel Eltron 24 Plus Tempra, tankless Water Heater 4.4 out of 5 stars (4.4 / 5) CHECK PRICE ON AMAZON Single Point or Multiple or Whole House Indoor/Outdoor
Thermoflow Elex 24ThermoFlow Elex 24 3.8 out of 5 stars (3.8 / 5) CHECK PRICE ON AMAZON Whole house Outdoor/Indoor
Eemax EEM24027 Electric Tankless Water Heater, BlueEemax EEm24027 Electric Tankless Water heater Blue 4.7 out of 5 stars (4.7 / 5) CHECK PRICE ON AMAZON Whole house Outdoor/Indoor
ECOTOUCH Electric Tankless Water Heater 4.3 out of 5 stars (4.3 / 5) CHECK PRICE ON AMAZON Single Point of use and Multiple Application Outdoor
iHeat Tankless S-9 240V 39A 9KW Stainless SteeliHeat Tankless S-9 240V 39A 9KW Stainless Steel 4 out of 5 stars (4 / 5) CHECK PRICE ON AMAZON Single point of use Outdoor
Rheem 240V 3 heating Chambers RTEX-24Rheem 240V 3 heating Chambers RTEX-24 3.9 out of 5 stars (3.9 / 5) CHECK PRICE ON AMAZON Multipoint Application Indoor
Rheem 240V heating Chamber RTEX-13 ResidentialRheem 240V heating Chamber RTEX-13 Residential 4.2 out of 5 stars (4.2 / 5) CHECK PRICE ON AMAZON Single Point of use and Multiple Application Indoor/Outdoor
Rheem 240V 2 Heating Chambers RTEX-18Rheem 240V 2 Heating Chambers RTEX-18 3.9 out of 5 stars (3.9 / 5) CHECK PRICE ON AMAZON Multipoint Application Indoor

Electric Tankless Water Heater Reviews Top 10

  1. EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology

EcoSmart Eco 27

  • Application Type: Whole house
  • Location: Indoor
  • Volts: 240 V
  • Amps: 112.5 Amp
  • Gpm: 3
  • Temperature Range: 60F rise
  • Size: 6 x 17 x 17 inches
  • Weight: 17 pounds
  • Display: Display
  • Warranty: Lifetime
  • Number of Review: 2293

Ecosmart tankless water heaters come in various power ranges to suit different household sizes. This one specifically is for average family size households, but for more options check out the link below. For people residing in the Northern part of the United States, where the temperature of the water coming in can be as low as 37F, this is the ideal tankless water heater. Being the largest electric tankless water heater in the EcoSmart class, it is capable of heating as much as 3 gallons per minute. Besides, it can serve the whole house. Hence, you can expect to run your shower and laundry at the same time. With a digital temperature, you can control the outlet water temperature.

With different options available smaller sizes and outputs are also available.

Ecosmart boast of the most advanced temperature in tankless water heater production, with aof savings of up to 50%. The model copulates with Ecosmart’s self-modulating technology which controls and regulates the amount of energy needed to raise the temperature of your water.  They are compact, capable of being mounted on the wall hence saving considerable space.

With over 2200 customer review, the EcoSmart ECO 27 has proven very reliable in providing utmost customer satisfaction. Therefore we believe it is best electric on demand water heater.

It weighs 17 pounds with a dimension of 3.6 x 17 x 17 inches. It is capable of producing 92,000 BTU/hour, with an overall efficiency of 99.8%.

PROS:
  • Comes at a reasonable price
  • Self-modulating technology
  • Capable of saving you 50% on heating cost
  • Compact size which saves space
  • Low power consumption
  • Uses copper and stainless parts which increase durability and efficiency

CONS:
  • Not recommended for icy location

User Rating:

4.1 out of 5 stars (4.1 / 5)

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  1. Stiebel Eltron 224199 240V, 1 Phase, 50/60 Hz, 24 kW Tempra 24 Plus Whole House Tankless Electric Water Heater, Advanced Flow Control

Stiebel Eltron

  • Application Type: Whole house
  • Location: Indoor
  • Volts: 240V
  • Amps: 100 A
  • Efficiency: 99%
  • Gpm: 0.5
  • Temperature Range: 60F
  • Size: 7 x 20.1 x 9.6 inches
  • Weight: 16.1 pounds
  • Display: Digital
  • Warranty: 7 yr leakage/3 yr parts
  • Number of review: 599

Still, in the class of whole house electric tankless water heater, we bring you Stiebel Eltron. This is one of the top-rated water heaters as Stiebel boast of using advanced technology in the production. It was equipped with upgraded technology to ensure it delivers a continuous flow of hot water without any glitch.

It features a single flow sensor design as well as a cover for easy access. It is a product of the Germans which is a good thing as Germans are noted for being technologically savvy.  This unit is bound to reduce electricity bills by 15 to 20%. You can control the exit temperature of hot water via a knob fixed on the water heater.

The unit comes with a compact design which occupies just a little space. It is pretty cheap, and the installation is straight forward as well. Users can expect a maximum flow of 0.5 gallons per minute at a temperature rise of approximately 50F. Weighing 16.1 pounds, it comes with a dimension of 21.7 x 20.1 x 9.6 inches. The customer satisfaction rate for this tankless heater is pretty high as more than 500 users expressed their opinion on the device.

PROS:
  • Quick and easy installation
  • A silent operation
  • Compact design that can fit anywhere
  • A continuous supply of hot water for many points in the house

CONS:
  • It does not come with a remote control

User Rating:

4.4 out of 5 stars (4.4 / 5)

CHECK PRICE & REVIEWS ON AMAZON

  1. Stiebel Eltron 24 Plus Tempra, Tankless Water Heater

Stiebel Eltron 24

  • Fuel Type: Electric
  • Application Type: Single Point or Multiple Application
  • Location: Indoor or Outdoor
  • Btu: 380,000
  • Gpm: 0.77
  • Volts: 240V
  • Ampere: 100 A
  • Energy Efficiency: 99%
  • Temperature: 86°F – 140°F
  • Size: 4.6 by 16.6 by 14.5 inches
  • Weight: 1 pound
  • Display: Digital
  • Warranty: 7 years leakage and 3 years part
  • Number of reviews: 599 customer reviews

If you need an electric instant hot water heater that will save you as much as 20% on your energy bills, try the Stiebel Eltron. It is one of the top rated tankless water heaters that comes with various features. This makes it stand out in the list of electric tankless water heater available in the market.

It is not subjected to standby heat loss. Besides, it was certified by ANSI/UL sd. It was also certified by various regulatory bodies. With this, users can be well assured of the safety that comes with using this tankless water heater. It also features the advance flow control that keeps the flow of water in check.

With a maximum flow rate of 4.5, it gives a temperature rise of 27F to 54F depending on the flow rate. This is your ticket to a continuous flow of hot water without excessive demand on your power bills. It was made with a sleek design which saves space without the need for venting.

PROS:
  • Very easy to install
  • Reasonable purchase and installation cost
  • No need for venting

CONS:
  • Running hot water at two locations reduce flow

User Rating:

4.4 out of 5 stars (4.4 / 5)

CHECK PRICE & REVIEWS ON AMAZON

  1. ThermoFlow Elex 24 Electric Tankless HeaterThermoflow Elex 24

  • Application Type: Whole house
  • Location: Outdoor/Indoor
  • Volts: 240 Volts
  • Amps: 60 Amp
  • Gpm: 0.6
  • Temperature Range: 35F rise
  • Size: 18.6 by 10 by 4.5 inches.
  • Weight: 11.24 pounds
  • Display: LCD
  • Warranty: two years
  • Number of review: 38

If you need a tankless electric water heater to serve various points at home, consider Thermoflow Elex 24. They are built with the latest German technology, and it is equipped with optimum energy saving capacity without compromising on delivering ample supply of hot water to users. This is the ideal solution for your pool house, bathroom sinks, kitchenettes, and the whole house.

This unit employs a bare wire heating system which reduces maintenance cost with an endless supply of hot water. With a maximum flow rate of 3 gallons per minute, it is designed to serve multiple points in the house. It is the perfect choice for people living in areas where the incoming water temperature can be as low as 37F. Homes in the Northern US and Canada with Jacuzzi will find this unit helpful.

The self-modulating technology ensures you can save as much as 50% in heating cost.  Hence, compared to the traditional water heater, this unit gives up to 85% saving. It comes in a sleek and stylish design that will blend perfectly with any decoration you have in your house. It works quietly without the need for venting.

It comes with an exclusive temperature Control device with which you get to set the output water temperature to the desired point. The digital backlit LCD allows you to monitor the temperature, and the device is capable of raising water temperature as high as 320C. One of the things that make this one of the best tankless electric heater brands is the fantastic accessories that come with the package. It weighs 11.24 pounds and measures 18.6 by 10 by 4.5 inches.

PROS:
  • The unit is completely silent in operation
  • A high flow rate of 3.4 gallons per minutes
  • Optimum reduction in energy bills
  • Comes with important installation accessories
  • The user enjoys warranty on the product as well
  • Consistent supply of hot water at a specific temperature
  • Aesthetically pleasing

CONS:
  • Awkward positioning of the inlet and outlet water pipe

User Rating:

3.8 out of 5 stars (3.8 / 5)

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  1. Eemax EEm24027 Electric Tankless Water Heater Blue

    Eemax EEM24027

    • Fuel Type: Electric
    • Application Type: Whole house
    • Location: Indoor/Outdoor
    • Gpm: 5.3
    • Volt: 240 Volts
    • Ampere: 112.5 Amp
    • Energy Efficiency: 99.8%
    • Size: 17 by 17 by 3.8 inches
    • Weight: 17.4 pound
    • Display: Digital
    • Warranty: 5 years leakage and 1 years part
    • Number of reviews: 7 customer reviews

    Also on the list of the best electric water heater is Eemax EEM24027. For everyone tired of the various disadvantages that come with traditional water heater, this is a good choice.With this electric tankless water heater, you can use hot water in a shower head and two sink at the same time in lower climates. In hot climates, it can handle as much as 4 showers or sink simultaneously.  It gives a flow rate of 5.3 gallons per minute, sufficient enough for whole house application. The unit is made of stainless steel which ensures it last long and performs well at transferring heat effectively.

    One of the ways this electric tankless water heater stands out is because of the self modulating technology. In other words, the demand on power is matched to the supply of hot water. It comes in compact size meaning you can install it anywhere and still have considerable space.

    PROS:
    • Users reported considerable savings in their energy bills
    • Comes with self modulating technology
    • Very easy to install
    • Compact size which saves space

    CONS:
    • Need for separate breakers

    User Rating:

    4.7 out of 5 stars (4.7 / 5)

    CHECK PRICE & REVIEWS ON AMAZON

    1. ECOTOUCH Electric Tankless Water Heater Point of Use Hot Water Heater

    ECOTOUCH Electric Tankless Water Heater

    • Fuel Type: Electric
    • Application Type: Single Point of use and Multiple Application
    • Location: Outdoor
    • Btu: 70,000
    • Gpm: 1.2 – 1.5 GPM
    • Volt: 240 Volt
    • Ampere: 30Amp
    • Energy Efficiency: 98%
    • Size: 5 x 9.8 x 4.1 inches
    • Weight: 5.97 pounds
    • Display: Digital
    • Warranty: 5 years
    • Number of reviews: 10 reviews

    If you need a reliable electric tankless hot water heater for various points in your house, Ecotouch electric tankless hot water heater is a good choice. With an overall efficiency of 98%, it is proven to do a terrific job of making hot water available without much demand on energy. It is ideal for sinks, and various faucets since it gives out hot water at the preset temperature immediate you turn it on.

    It is capable of moving 1.2 grams of water per minutes and can raise the temperature of water as high as 42F. It is the ideal component for constant supply of clean water as there is neither bacteria growth nor the issue of rust. No scales build up as well as water and healing do run at the same time.

    Without a doubt, ECOSMART is of the best electric tankless water heater brand due to the smart modulation technology. In other words, the unit controls the demand on power based on the outlet water temperature. The best part is that the unit comes with a number of safety features which makes it ideal and safe for use in home.

    PROS:
    • Presence of safety features like leakage protection and dry heating protection
    • Pretty easy installation process
    • Presence of self modulating technology
    • Presence of remote control

    CONS:
    • Only designed for sinks

    User Rating:

    4.3 out of 5 stars (4.3 / 5)

    CHECK PRICE & REVIEWS ON AMAZON

    1. iHeat Tankless S-9 240V 39A 9KW Stainless Steel Electric Tankless Water Heater

    • Application Type: Single point of use
    • Location: Indoor/outdoor
    • Volts: 240V
    • Amps: 39A
    • Gpm: 2
    • Temperature Range: 71F temperature rise
    • Size: 3.5 by 7.7 by 11.5 inches
    • Weight: 8 pounds
    • Display: digital
    • Warranty: 1 yr Elements limited 3-Year Components 5-yr leaks
    • Number of review: 33

    As as a single point of use, iHeat S-9 is a good choice. It is suitable for use in the bathroom, under the sink for kitchenettes and every point in the house where a continuous supply of hot water is inevitable. It is a small but powerful water heater, capable of raising 2 gallons of water per minute, with a huge temperature rise of 71 F.

    It is compact, hence can comfortably be installed right under your kitchen sink or bathroom. One of the advantages of going for an electric tankless water heater is that it removes the need to make costly change or installation to the house. The need for venting is out of the way. This unit comes equipped with 36-inch wire, making it easy to be installed alongside the existing electrical connection of your home.

    There is a digital display with which you monitor and control the output temperature of the outlet water. The entire unit was manufactured using stainless steel. This makes it durable, improving the heat transfer capacity of the heat exchangers as well. It also features a waterproof construction which makes it easy and safe to control the water temperature with the help of the interactive touchpad.

    With a weight of 8 pounds, it measures 3.5 by 7.7 by 11.5 inches. It operates on a 240 volts, 9 KW electricity supply.

    PROS:
    • The installation process is easy
    • Presence of safety features
    • Silent in operation
    • Allows user to adjust the flow rate to the desired level

    CONS:
    • Someone complained that the safety features don’t allow the water to rise above 170F
    • Not suitable for a large house

    User Rating:

    4 out of 5 stars (4 / 5)

    CHECK PRICE & REVIEWS ON AMAZON

    1. Rheem 240V 3 heating Chambers RTEX-24 Residential Tankless Water Heater

    Rheem Residential Tankless Water Heater

    • Application Type: Multiple Application
    • Location: Indoor
    • Volts: 240V
    • Amps: 112.5A
    • Gpm: 5.9
    • Temperature Range: 45F rise
    • Size: 4 by 18 by 19 inches
    • Weight: 20 pounds
    • Display: Digital
    • Warranty: 5 years
    • Number of review: 10

    While being a multiple application tankless water heater, Rheem RTEX-24 Residential Tankless Water Heater can also be used as a single point of use application. It comes with many amazing features that ensure a continuous supply of hot water without any glitch. This unit comes with outstanding advanced features which qualify it as one of the best electric tankless water heaters.

    Part of the fantastic feature is the advanced self-modulating capacity. With this, Rheem can adjust itself and its power consumption so that you get enough hot water without excessive demand on power. It also comes with a LED display feature alongside thermostatic control with which you get to monitor the temperature of the unit.

    It is suitable for both indoor and outdoor installation. Besides, the unit is compact such that it can be installed anywhere without taking much space. It consumes 240 Volts of electricity and weighs approximately 20 pounds. With a flow rate as high as 5.9 gallons per minute, you will have enough hot water to serve multiple points in your home. It measures 4 by 18 by 19 inches.

    PROS:
    • Installation is quite easy
    • The unit does not make noise
    • Heats water very fast, less than 15 seconds
    • Digital control

    CONS:
    • The unit is ideal for a small house only

    User Rating:

    3.9 out of 5 stars (3.9 / 5)

    CHECK PRICE & REVIEWS ON AMAZON

    1. Rheem 240V heating Chamber RTEX-13 Residential Tankless Water Heater

    Rheem 240V Heating Chamber

    • Fuel Type: Electric
    • Application Type: Single Point of use and Multiple Application
    • Location: Indoor/Outdoor
    • Btu: 199,000
    • Gpm: 1.5 gallons per minute
    • Energy Efficiency: 99.8%
    • Size: 4 by 9 by 13 inches
    • Volt: 240V
    • Ampere: 70 Amp
    • Weight: 8.5 Pounds
    • Display: Digital
    • Warranty: 5-year heat exchanger and 1-year parts limited warranty.
    • Number of reviews: 68 reviews

    Rheem RTEX 13 is in the class of a small tankless electric water heater. It is a product of Rheem, one of the most trusted brands on turning out reliable and durable tankless water heater for use. It is the ideal choice to ensure a constant supply of hot water at every essential faucet in your house.

    It comes with many features which makes it stand out among the list of best electric hot water heaters out there. You can set the outlet water temperature to whatever you desire via the external digital thermostatic contol. It has a LED display with which you can monitor the outlet temperature. This unit is very easy to install and servicing also comes at a breeze.

    All essential accessories needed for swift and seamless installation are included in the package. With an energy efficiency of almost 100%, you can expect top performance from this unit.

    PROS:
    • Easy installation
    • Heats water faster
    • Comes with essential installation accessories

    CONS:
    • Some customer complained of leaking

    User Rating:

    4.2 out of 5 stars (4.2 / 5)

    CHECK PRICE & REVIEWS ON AMAZON

    1. Rheem 240V 2 Heating Chambers RTEX-18 Residential Tankless Water Heater

    Rheem 240V 2 Heating Chambers

    • Application Type: Multiple Application
    • Location: Indoor
    • Volts: 240V
    • Amps: 75 Amp
    • Gpm: 4.4
    • Temperature Range: 55F
    • Size: 4 by 15 by 19 inches
    • Weight: 8.5 Pounds
    • Display: LCD
    • Warranty: One year parts warranty, ten years heat exchanger warranty
    • Number of Review: 38

    Finally, on our list of the best electric tankless water heater review, we have Rheem 240V RTEX-18. It is a unique tankless water heater in the class of professional series offered by Rheem. This is your ticket to a continuous supply of hot water for your laundry and shower.

    This unit comes with some features that make it outstanding among the series of tankless water heater available in town. You get to easily control the water temperature to your desired state with the external digital thermostatic control. This device also features an advanced self-modulating feature which reduces the demand on energy without sacrificing its efficiency. It is capable of heating 4.4 gallons of water in a minute.

    Many users have expressed satisfaction with this tankless water heater. Weighing just 8.5 pounds, it measures 4 by 15 by 19 inches, and work with a 240 Volt power supply.

    PROS:
    • Installation is simple
    • Silent operation
    • Users reported an impressive reduction in electricity bills

    CONS:
    • Water temperature tends to fluctuate

    User Rating:

    3.9 out of 5 stars (3.9 / 5)

    CHECK PRICE & REVIEWS ON AMAZON

    Well there you have it. The top 10 best electric tankless water heater reviews.

    If you are still not sure about whether a tankless electric water heater is for you then the buying guide below will answer all if not most of your questions!

    Frequently Asked Questions & Buying Guide To Tankless Electric Water Heaters

    How electric Tankless Water Heater Works

    There are heating elements are embedded in an electric tankless water heater. These heating elements are triggered by the flow sensing device which operates at a maximum flow rate and a constant heat input. You can get the flow rate of your choice by adjusting the pressure knob.

    Demanding for water at a high flow rate will give water at low temperature since the water did not spend enough time circulating the heat exchangers.

    What are the advantages of an electric tankless water heater compared to gas?

    Electric tankless water heater stands out from the gas-powered type as combustion does not take place in the unit. If you are lost on which type of tankless water heater to buy, we discuss how the electric tankless water heater stands out:

    1. Cost

    One of the ways an electric water heater stands out is the cost. These units are way less expensive compared to the gas counterpart. While a gas tankless water heater could be in the range of $1000 and above, the electric counterpart can be around $500.

    1. Installation

    Due to the complexity of all tankless water heater, it is essential that it is only installed by a qualified professional.

    Electric tankless water heaters are pretty much more comfortable to install and besides, does not require much installation cost. They are small in size which makes handling quite easy. Asides, the absence of combustion eliminates the need for ventilation. This dramatically reduces installation stress and cost and makes it easy to install your electric tankless water heater unit anywhere.

    On the other hand, the gas component is pretty complicated; hence installation is expensive. The noncondensing part needs a complicated venting system for adequate air flow to support combustion. Besides, the existing vent duct in a home is usually not compatible with a gas tankless water heater. Hence, the need for a fresh installation, leading to the extra cost.

    1. Maintenance

    One of the ways an electric tankless water heater stands out is the ease of maintenance. All that is required of the owner in terms of maintenance is making sure the inlet screen filter (the part that stops debris from entering the system) is free of obstruction.

    The gas component, on the other hand, requires a pretty complicated maintenance routine. Every year, the unit should be inspected by a licensed technician. His job is to ensure that combustion is safe and the unit is in top condition. There is also the need for regular flushing due to the susceptibility of a gas unit to mineral scale buildup. This and many more make the maintenance of the gas tankless water heater cumbersome.

    1. Durability

    The design and working principle of the electric tankless water are pretty simple. As a result, they often last more than two decades. While warranty varies from manufacturer to manufacturer, labor typically last a year while most parts are covered for five years. Besides, troubleshooting an electric tankless water heater in case of any issue is simple easy

    While a gas tankless water heater might also last up to 20 years, they are often difficult to service and troubleshoot. This is due to the complexity of the design and the heat exchanger. While warranties also vary, the heat exchangers do come with ten years warranty while other parts last up to five years.

    1. Efficiency

    Without a doubt, electric tankless water heaters are usually more efficient than the gas counterpart. They are generally around 98% efficient making them durable and reliable. They also stand out in that heat transfer doesn’t happen from the combustion of fossil fuel; hence, it is environmentally friendly.

    The gas unit on the other hand also has efficiency in the range of 80%. Besides, as a result of combustion, it releases greenhouse gases to the atmosphere, making them less environmentally friendly.

    The disadvantage of Electric Tankless Water Heater

    As exciting as the idea of owning electric tankless water is, it is not perfect. It does come with some disadvantages that are worth taking note of.

    1. A Low Flow Rate

    One of the disadvantages of an electric tankless water heater is that its flow rate is limited. The most electric unit does not deliver more than 8 GPM which is pretty lower compared to the gas counterpart.

    1. The Need for High Current Wiring

    To install and use a hot water wiring system, the home electrical wiring system has to be strong. Some units like the EcoSmart ECO 27 for instance, draw as much as 220 Volts. This could be above the maximum capacity installed for various homes.

    Besides, many houses are equipped with 100-amp service, right from the utility pole. Hence, upgrading to an electric tankless water heater means significant investment in upgrading the housing unit.

    1. Power Failure means no Hot Water

    An electric tankless water heater needs hot needs constant supply of electricity all time since there is no water in reserve. Also, most home generating set does not produce enough power to run an electric tankless water heater.

    Various Application Type for Electric Tankless Water Heater

    Besides classification based on the type of fuel used, tankless water heater are also grouped based on how they are used. In other words, we have three classifications of the top-rated electric tankless water heater:

    1. Single Point of Use Classification

    When hot water comes out of the electric hot water system, it loses some heat to the atmosphere in flowing to the faucet where it is needed. In a bid to reduce this waste, manufacturers came up with a single point of use classification. Hence, an electric tankless hot water heater can be fixed near the exact place where needed for instance, under the sink, above the showerhead, etc. Hence, the heating process takes place in the vicinity where hot water is required. Besides saving heat loss and preserving water temperature, this also reduces installation cost.

    There are many advantages to the point of use electric hot water heater. Besides the ones highlighted above, a single point of use electric water heater is very efficient. These types of water heater are usually small since they are dedicated to a single place.

    1. Multipoint Application

    If you need to use hot water in remote locations like garages, dorm rooms, cloakroom, etc., a multipoint electric water heater is the best to consider.

    This tankless water heater can handle a showerhead and the laundry only if one point is used at a time.

    1. Whole-House Application

    If you need an electric tankless water heater to serve and supply hot water to various fixtures in your house, we recommend the whole house. For instance, one unit might provide hot water to two sinks and the shower at a time. The fixtures of whole house tankless water heater differ because various fixtures use the different amount of water. Some laundry could use five times more water than a kitchen sink.

    Whole house water heaters come in sizes. Hence, you can select the one that will serve your household appropriately. Although, the selection is majorly a factor of flow rate which is determined by the number and types of fixtures you have in your house. Bear in mind that shower heads are the point that places most demand on the tankless heater; hence, you need a water heater that will meet your need.

    How Much Can A Tankless Water Heater Electric Save You?

    Most tankless water heater manufacturer does claim that electric tankless water heater will save you an average of 40%. The Tennessee Valley Authority, however, revealed that you could get a yearly saving of $30 on electricity using the electric unit. However, the average tankless water heaters do need at least 120 amps of power to operate while the combined group of an average household is about 200 amps.

    The interpretation of this is that the electrical system of your home has to be upgraded to accommodate the extra demands of an electric tankless water heater. This upgrade could cost you up to $1500. Besides, there is a need for additional equipment at the meter base. This extra equipment cost almost $2000 which is way more than what someone with a traditional tankless water heater will spend.

    All in all, an electric tankless water heater will save you some money. However, you will not get real value for your investment until after many years.

    How to Determine the Type of the Electric tankless water you need

    As a result of the complexity of tankless water heaters, you need to be meticulous in getting the accurate size. If you decide to go for an electric tankless heater, we have the following tips to help determine the precise extent of the unit.

    1. Consider the Size of Your House and Number of Devices and the Application

    In other words, how many people will the electric tankless water be serving?

    In addition to this, you need to know if a single point of use that will serve a single outlet such as the kitchen sink, shower heads or laundry is what you need. A small single point of use electric water heater can help you here. Or a whole house unit that will supply water for three or more units at the same time. In this case, you need a bigger unit.

    Tankless water heaters, unlike the traditional means of heating water, do not store hot water. Rather they work by transferring heat to the water as it flows through the heat exchanger. The heated water is then supplied to various points in the home. The implication of this is that we need to find a way to determine the essential parameters that you need to size a tankless water heater

    1. Get the Combined Flow Rate

    This involves getting the total flow rates of hot water at the various points that require water in your home. For instance, if you are going for the whole house application, then you should consider a time when the laundry and two shower heads will be working consecutively.

    Shall we assume that the standard flow rate for a shower head is 1.2 gallons per minute. With this, your tankless water heater should be able to give at least 2.4 gallons per minute to serve you effectively.

    Assuming someone will want to do the laundry or wash vegetables at the kitchen sink. Then the entire flow rates have increased. We have here some figures for the flow rate for various household appliances. Although these figures could differ from house to house and with each device, it does give a rough idea.

    Fixture/Appliance Flow rates
    Bathroom Faucet 0.5 – 1.5 GPM
    Kitchen Faucet 3.0 – 7.0 GPM
    Showerheads 1.0 – 2.0 GPM
    Dishwasher 1.0 – 2.5 GPM
    Clothes Washer 1.5 – 3.0 GPM
    1. Get the necessary temperature Rise

    It does not stop at knowing the amount of water you need to heat your water. You also have to determine how much and how high you need to boil the water. This is called the temperature rise which is the difference between the inlet water temperature and the outlet water temperature.

    For instance, when water that enters the electric tankless water heater at 35F and comes out of the kitchen sink at 75F, the temperature rise is 40F. This means that your water heater should be able to heat at least 5.0 gallons per minute, raising each gallon by 40F.

    It is, however, essential to have an idea of the average temperature of the water coming from underground in your home. These numbers vary with different states as some state can be a slow as 35F and some as high as 75F. This is an essential factor to consider in getting your electric tankless water heater as it determines how effect the unit will be.

    Make sure you work with these groundwater temperature figures and aim for a value a little lower than what you have. However, you can always assume 40F if you are not sure of the temperature of the incoming water in your locality. With this, you will not underestimate the rise in temperature.

    1. Consider Peak usage Time

    It is also a good idea to make room for excessive water demands.

    During most time of the day, you might not need more than one faucet at a time like doing the laundry, flushing the toilet or having a shower, which can be done individually. However, you should make provisions for the peak hours when the demand for hot water will be high. For instance, should you have a couple of friends over, your uncle’s kid coming over for the summer break, etc. You need to make sure your electric tankless water heater can handle the extra demands.

    Adequate planning for periods like this will make sure you never run out of hot water. As a result of this, it is recommended that you make provisions for this. Hence, the typical day to day operation of your water heater will be a breeze, while it will still be able to handle the extra demands when needs arise.

    Sample Case of Sizing an Electric Tankless Water Heater

    Shall we run through this example as a case for taking note of the peak hour period.

    It is Sunday morning. You have to cook breakfast, and your guests have to do laundry before going for the shower and heading for church. All these have to take place between the hours of 7 and 9 AM.

    • Three showers running (3 GPM)
    • Laundry (2.5 GPM)
    • Bathroom for washing and brushing teeth (0.9 GPM)
    • Kitchen sink for food preparation (5 GPM)

    Taking an approximate combination of the above, your electric tankless water heater must be able to supply between 7 GPM to 12 GPM. This, without a doubt, is a heavy load for a single tankless water heater, especially if you live in a cold climate.

    However, if you can organize demands for hot water, you should be able to get this GPM figure down to about 7 GPM. However, the moral of this example is that there could be a time when the demands of water will stress your electric tankless water heater.

    Bear in mind that the water situation scenario described above is not meant to discourage you. However, have in mind that choosing a small tankless electric water heater to save money is not a good idea.

    This will not pay you because you might not save money even in the long run. You will have to spend more on water bills as the heavy loads of cold water flow through the pipe, waiting to be heated up. Besides, overstressing your small electric tankless water heater beyond its capacity might make the unit break down, requiring more repair and maintenance.

    Conclusion

    It is quite evident that electric tankless water heaters are growing in popularity because of their economical and environmentally friendly benefits.

    If you decide to invest in an electric tankless heater, make sure you choose the model that serves the entire need of the household.

    This on demand electric tankless water heater review has highlighted the best electric tankless water heaters in the market.

    We hope this guide will hold you by the hand in selecting the best electric tankless water heater for your household.