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Electric Tankless Water Heater Reviews 2018-02-12T04:41:42+00:00

Electric Tankless Water Heater Reviews Guide

Welcome to Top Tankless Water Heater Reviews. This guide has been developed to provide you with the most comprehensive and up-to-date electric tankless water heater reviews for 2018.

Firstly, we’ll discuss what a tankless water heater is and the benefits of a tankless water heater over a traditional hot water system. We will then cover the differences between a gas tankless water heater and an electric tankless water heater. Once you have read our electric tankless water heater reviews guide, you will be sufficiently knowledgeable and confident to make an informed purchase. We’d like to thank you for visiting our site. If you find it beneficial, please bookmark it so you can return to it later.

What is a tankless water heater?

The primary feature of a tankless water heater is that it is as the name suggests, tankless; therefore, hot water is only provided on demand or as needed. The associated benefit with this particular feature is the reduced energy costs as there is no need to constantly heat a storage tank of water.

How does a tankless water heater work?

When a hot water tap is turned on, cold water travels through the pipe into the tankless water heater unit. If it is an electric tankless water heater, the electrical elements will heat the water. If it’s a gas tankless water heater, the gas burner heats the water; both variations resulting in a constant supply of hot water.

What do I need to consider when choosing a tankless water heater?

  1. You will firstly need to identify your inlet water temperature (this can be achieved using the image on the right). In colder climates, the tankless water heater will need to work harder to warm the water. In warmer climates, where the incoming water temperature is warmer, your heater will not need to work as hard.
  2. You will need to determine your gallons per minute requirement. Considerations will include how many people live in your home and what applications you may simultaneously need to heat.
  3. You will need to identify if you have the necessary electrical requirements to support the unit that you need. Your tankless water heater may need greater voltage requirements and an electrician may be needed to install upgraded breakers and thicker gauge wiring.
  4. Note: Please ensure you obtain the services of a professional to install your tankless water heater for both safety and warranty purposes.
Incoming Water Temperature

Additional considerations you may wish to think about include the environmental benefits and the energy efficiency rating.

The new industry standard for measuring energy efficiency in water heaters is now called Uniform Energy Factor (UEF). This new standard recently came into effect on June 12, 2017. The new UEF standards are designed to make it easier for consumers to compare energy efficiency between appliances and the ratings are determined by assigning water heaters into a particular category (4 categories in total) of hot water based on usage and then evaluation of the tankless water heater’s performance based on that usage. A greater UEF indicates that the tankless water heater in that particular category is more efficient.

An interesting document worth reading (click here) has been produced by the US Department of Energy, titled “Transitioning to a Tankless Water Heater”. This document contains everything that is necessary to know prior to selecting and purchasing a tankless water heater.

Tankless Water Heater Pros and Cons

What are the disadvantages to a tankless water heater?

Gas vs Electric Tankless Water Heater…what’s better?

Unfortunately, there is not an answer to this question; both variations have pros and cons and you will need to decide what works best for you. You may not even have an option to decide between the two as availability may be a problem. Let’s look at this further.

Product Cost: A primary factor in making a purchasing decision will be the cost and value for money for a particular product. Electric tankless water heaters will set you back anywhere from as little as $100USD up to $700USD for the device (professional installation will be additional to this). A gas tankless water heater is similar but can be higher in price. The cheapest propane-powered model is approximately $120USD and can range up to $2000USD, therefore, when considering whether gas or electric is a better model, an electric on demand water heater is likely to be a cheaper option over its gas counterpart.

Fuel Costs: In the United States, current gas prices are lower than electricity so this may be a factor worth considering when deciding on the type of tankless water heater model you would like to go with. If you are fortunate enough to have the option of choosing electricity or gas, it’s worth comparing fuel costs in your particular area to identify which method of power will be cheaper.

Environmental Impact: Both gas and electric instant water heaters are significantly more energy efficient than traditional storage hot water systems due to their on demand heating function and they require less energy. The comparison between on demand water heaters both gas and electric in terms of carbon emissions is basically negligible, however gas over coal powered electricity tends to be the preferred greener option.

Installation requirements and costs: Electric tankless water heaters are slightly easier to install. Tankless water heater venting is not a requirement as it is with gas models.

Electric Tankless Water Heater Reviews

Before we go into this guide’s electric tankless water heater reviews, we have provided a comparison table that allows you to quickly identify the size, suitability and cost of the reviewed electric tankless water heaters contained in this guide. 

Bosch Tronic 3000T
$
Tank Volume: 4g
Max Fixtures: 1
Point of Use
Marey Eco 110
$
Max Flow Rate: 3 gpm
Max Fixtures: 2
Point of Use
Rheem RTEX13
$$
Max Flow Rate: 3gpm
Max Fixtures: 2
Whole house (small)
EcoSmart Eco18
$$
Max Flow Rate: 4.4 gpm
Max Fixtures: 4
Whole House (small)
EcoSmart Eco24
$$
Max Flow Rate: 5.9 gpm
Max Fixtures: 5
Whole House (med)
EcoSmart Eco27
$$$
Max Flow Rate: 6.6 gpm
Max Fixtures: 5
Whole House (large)
EcoSmart Eco36
$$$
Max Flow Rate: 8.8
Max Fixtures: 6
Whole House (large)

If you have decided that a tankless electric water heater is the product for you, continue reading for the best electric tankless water heater in the electric tankless water heater reviews below:

Rheem RTEX 13 Electric Tankless Water Heater Review

Rheem RTEX 13 Specs:

Voltage: 240

kW: 13kW

GPM: 4.8gpm

Required breaker: 1 x 60 Double pull

Dimensions: 4 x 9 x 13”

Max Amperage: 54

Weight: 8.5lb

Water Connection: standard ½”

Warranty: Parts: 1yr Heat exchange: 10yrs. Warranties only valid if unit was installed by licensed technician.

The Rheem RTEX 13 is the newer and improved model up from the Rheem RTE13.  It is compact and lightweight enough to fit anywhere and can be floor or wall mounted. The RTEX 13 consists of an advanced water flow rate and temperature sensors which have been designed to modulate power to the heating elements in order to maintain a user-selected output water temperature between 80° to 140°. This can be adjusted (in 1° increments) via the external adjustable digital thermostatic control located on the front of the Rheem RTEX 13 which indicates the unit’s active element and standby mode.

Included in the package is a ½ inch water connection, a durable brass/copper heat exchanger and a pre-wired 3ft power supply cord.

RESULT: The Rheem RTEX-13 is a stylish and compact electric tankless water heater that provides on demand and consistent hot water. For more information on Rheem tankless water heaters, click here.

Ecosmart Tankless Water Heater Reviews

Ecosmart are industry leaders in tankless electric water heaters and offer multiple tankless water heaters in the eco smart range. EcoSmart stands out due to its green energy values and if you are someone looking for a more energy efficient and environmentally friendly option, an EcoSmart tankless water heater is a viable option.

We have reviewed four units from the ecosmart range, the ecosmart 18, ecosmart 24, ecosmart 27 and the ecosmart 36. If you are looking for a whole house tankless water heater, consider the EcoSmart36. If your water heating needs aren’t as significant and you are seeking a smaller unit, the EcoSmart 18 or 24 would be more suitable.

Continue reading for an in-depth review of the four units from EcoSmart’s tankless water heater range, but before you do, watch the below YouTube clip for sizing information.

Specifications:

Voltage: 240

kW: 18kW

gpm: 2.5

Required breaker: 2 x 40 A

Dimensions: 17”H x 14”W x 3.625”D

Weight: 11.7lb

Water Connections: ¾”NPT

Warranty: Limited lifetime warranty on heat exchanger, electronics and elements and is only valid if installed by a licensed technician within 30 days of purchase.

The EcoSmart ECO 18 is suitable for medium sized households (townhouse/apartment size) with up to 3 people.  When you are deciding which size electric tankless water heater you need, ensure your unit can provide the required output. The inlet water temperature is crucial when deciding which size you require and in cooler climates the eco 18 tankless water heater is capable of heating a shower and sink. In warmer climates, it has the capacity to handle two showers and two sinks.

The Ecosmart 18  features a stylish, compact, and advanced design with a digital temperature control which enables you to adjust the temperature in 1 degree increments, allowing you to set the temperature anywhere between 80°-140°.

The components are made of copper and stainless which are particularly suitable for durability and easy replacement.

ECO18 FLOW RATE CAPACITY CHART

TEMP
37°F
42°F
47°F
52°F
57°F
62°F
67°F
72°F
GPM
1.8
2
2.1
2.3
2.6
2.9
3.2
3.7

Ecosmart Tankless Water Heater Review (eco24)

Specifications:

Voltage: 240

kW: 24kW

gpm: 2.4-5.9 depending on inlet temperature

Required breaker: 3 x 40 A

Dimensions: 17”H x 17”W x 3.625”D

Weight: 14.25lb

Water Connections: ¾”NPT

Warranty: Limited lifetime warranty on heat exchanger, electronics and elements and is only valid if installed by a licensed technician within 30 days of purchase.

The EcoSmart 24 is suited for a medium to large single family home and has the capacity to simultaneously heat a shower and two sinks in the northern, colder states. In warmer climates, it can warm up to three showers and two sinks at the same time. This tankless water heater is one of the best whole house tankless water heaters available on the market and certainly great value for money.

ECO24 FLOW RATE CAPACITY CHART

TEMP
37°F
42°F
47°F
52°F
57°F
62°F
67°F
72°F
GPM
2.4
2.6
2.8
3.1
3.4
3.8
4.3
5

Ecosmart Tankless Water Heater Review (eco27)

Specifications:

Voltage: 240

kW: 27kW

gpm: 6

Required breaker: (3) 40 DP

Dimensions: 17”H x 17”W x 3.75”D

Max Amperage: 112.5

Weight: 13.75lb

Water Connections: ¾”NPT

Warranty: Limited lifetime warranty on heat exchanger, electronics and elements and is only valid if installed by a licensed technician within 30 days of purchase.

The EcoSmart ECO 27 is suitable for large households which require sufficient hot water to meet the demands of multiple applications. It features a powerful flow rate of 6 gallons per minute which equates to running four showers and a sink simultaneously without running out of hot water.

When you are deciding which size electric tankless water heater you need, ensure your unit can provide the required output. The inlet water temperature is crucial when deciding which size you require.  For northern U.S states where water temperatures can reach as low as 37°F, the ECO 27 can heat nearly 3 gallons per minute, sufficient enough to run two showers simultaneously. For those in the Southern U.S states, it’s able to heat almost 6 gallons of water per minute which is powerful enough to run four showers and a sink simultaneously without running out of hot water.

The Eco 27 tankless water heater features a compact design with a digital temperature control which enables you to adjust the temperature in 1 degree increments, allowing you to set the temperature anywhere between 80°-140°.

ECO27 FLOW RATE CAPACITY CHART

TEMP
37°F
42°F
47°F
52°F
57°F
62°F
67°F
72°F
GPM
2.7
2.9
3.2
3.5
3.8
4.3
4.9
5.6

Ecosmart Tankless Water Heater Review (eco36)

Specifications:

Voltage: 240

kW: 36kW

gpm: 3.6-8.8 depending on inlet temperature

Required breaker: 4 x 40 A

Dimensions: 17”H x 21”W x 3.625”D

Weight: 18.35lb

Water Connections: ¾”NPT

Warranty: Limited lifetime warranty on heat exchanger, electronics and elements and is only valid if installed by a licensed technician within 30 days of purchase.

The EcoSmart Eco 36 is the largest in the EcoSmart range and is an ideal whole house electric tankless water heater. The Eco36 is powerful enough to run four showers and two sinks simultaneously (in warmer states). Even in the coldest of climates (Northern most states and Alaska), the Ecosmart 36 has the capacity to power one sink and two showers concurrently.

ECO36 FLOW RATE CAPACITY CHART

TEMP
37°F
42°F
47°F
52°F
57°F
62°F
67°F
72°F
GPM
3.6
3.9
4.2
4.6
5.1
5.7
6.5
8.8

Point of Use Water Heaters

How do Point of Use Water Heaters Work?

Point of use water heaters are designed to improve your hot water distribution system by supplementing your existing hot water system and providing hot water almost instantaneously to your faucet. Additionally, it can also improve your hot water distribution system by preventing heat lost as hot water is being distributed from your central hot water heater to your faucet.

There are two types of point of use water heaters; tankless and tank. Our electric tankless water heater guide features two point of use water heater reviews, the Bosch Tronic 3000t and the Marey Eco110. The Bosch Tronic is not tankless and is designed to hold a capacity of 4 gallons of water in its water tank. It is ideal as a point of use water heater for a shower in the bathroom or a kitchen sink. You can find a more in depth review of the Bosch Tronic 3000T if you scroll further down the page. The Marey Eco110 is a tankless point of use water heater and can heat two fixtures simultaneously in warmer climates but only capable on heating one fixture in colder climates. Please scroll down the page to find a more detailed Marey Eco 110 review.

Bosch Tankless Water Heater Review

Specifications

Temperature range: 65-145°F

Volts: 120

Weight: 17.4lbs

Dimensions: 13.75W x 13.75 H x 13.5 D

Max Amperage: 12A

Water Pressure range: 150psi

Warranty: 1 yr parts warranty

Bosch Tronic 3000T ES4 Tankless Under Sink Hot Water Heater 

The Bosch Tronic 3000T features a compact and lightweight design and can fit under a sink or in a cabinet. This mini under sink hot water heater can be shelf, wall (bracket included) or floor mounted. You will notice the difference once you have installed the Bosch tankless electric heater; hot water is provided at point of use and quickly! A temperature/pressure relief valve is installed for your safety and the unit features a 120 Vac plug-in connection. The Bosch electric hot water heater can be used as a supplement to an existing primary water heater source or alternatively, installing multiple Bosch electric instant hot water heaters at the point of use such as under the sink and in the bathroom is a viable, alternative and cheap option.

If you are looking for an inexpensive, small electric water heater to heat one application at a time, then the Bosch Tronic 3000T is arguably one of the best point of use water heaters available!

Marey Tankless Water Heater Review

Specifications:

Weight: 7.5 lb

Dimensions: 3 x 8.6 x 14.8 Inches

Voltage: 240

kW: 11

GPM: 1.3gpm up to 3gpm in warmer States

Amperage: 45.8

Required Breaker: 1 x60

Warranty: 5 year warranty

Marey has been a player in the tankless water heater industry for over half a century; they have a brand to uphold so you know you are getting a reliable and high quality product. For after sales support, Marey provide exceptional customer service to ensure that you are getting the best out of your Marey tankless water heater.

The Marey Eco110 water heater is suitable for 2 simultaneous points of use (i.e. shower and a sink) in warmer regions (as you can see in the inforgrapic). For northern, cooler regions where the incoming water temperature is colder, you will get approximately 1.3 GPM from your Marey Water Heater.

SMART Technology has been utilized in the Marey Eco110 design. The unit contains an LCD panel that allows you to program the water temperature, maximizing your electricity consumption.

The Marey tankless water heater features a stainless steel water channel and heating chamber. This particular feature is one of a kind in the market and consists of a corrosion resistant patented heating element. The heating element reduces hard water build up from chlorine and calcium.

Requirements:

Ensure you have enough space on your breaker panel for the Marey Eco11 unit.

A professional plumber/electrician will need to install the unit.

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Thank you for reading our electric tankless water heater reviews guide for 2018! We always seek to provide a comprehensive guide that answers all of your questions. If we haven’t answered all of your questions, please feel free to get in touch with us!
If you would like more information about natural gas tankless water heaters or tankless propane water heaters, check out our best gas tankless water heater reviews guide!