Electric Tankless Water Heater Reviews 2017-09-03T21:03:11+00:00

Electric Tankless Water Heater Reviews Guide

This guide has been developed to provide you with the most comprehensive and up-to-date electric tankless water heater reviews for 2017.

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?

How many people live in the home?

What will the hot water be used for?

How do I determine 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.

Incoming Water Temperature

What are the benefits of a tankless water heater?

As previously mentioned, the biggest advantage to a tankless water heater is the reduced energy costs as there is no requirement to heat a water tank. Additionally, you don’t have to wait for a storage tank to fill up with water. With a tankless water heater, you get hot water on demand.

Maintenance and replacing parts can extend the life of your tankless water heater and the working age of a tankless water heater would likely exceed a traditional hot water tank.

Tankless water heaters are very convenient and take up very little room, especially in comparison to a traditional hot water system. Tankless water heaters are designed to be wall mounted, reducing space in your home.

Eliminates the risk of flooding and damage due to rusted out traditional hot water tanks

Rebates available 

Are there any disadvantages to a tankless water heater?

As with all products, there are advantages and disadvantages both of which we will discuss here. Generally, a tankless water heater will provide a hot water flow rate between 2-5 gallons per minute. In a large household where multiple activities that require hot water may be occurring at the same time; if for instance, someone is taking a shower and the dishwasher is running simultaneously, a tankless water heater may be exceeding its capacity to supply hot water to both activities. To alleviate this problem, a simple fix is to install two tankless water heaters to meet the hot water demands of a large household.

When comparing costs between a traditional hot water tank and a tankless water heater, the cost of the latter can often be greater. However the excess outlay for the tankless water heater will be regained through energy cost savings and a longer lifespan. A traditional hot water tank lifespan is approximately 10-15 years; a tankless water heater is more likely to last longer, up to 20 years if looked after accordingly.

Electric vs Gas…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 very similar 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, initial product cost does not vary significantly enough to make a decision based on this particular factor.

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

Environmental Impact:

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

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


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. We have reviewed the four units from the ecosmart range, the ecosmart 11, ecosmart 18, ecosmart 24 and the ecosmart 36

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ecosmart eco 27 Review


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°.

Bosch Tankless Water Heater Review


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 4GL Bosch T 4 gallon electric mini-tank under sink water heater

Compact and lightweight design can fit under a sink or in a cabinet 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 Tronic 3000t can be used as a supplement to an existing primary water heater source or alternatively, installing multiple Bosch heaters at the point of use such as under the sink and in the bathroom is an option.

The tank consists of glass-lining for insulation and durability

An external dial enables you to

Bosch tankless water heater parts

Bosch Water Heater Parts

Marey Tankless Water Heater Review


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.


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

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



Thank you for reading our electric tankless water heater reviews guide for 2017! 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!