Best electric tankless water heater for whole house 2023

Worried about consuming too much energy to heat your water? You’re in the right place! This guide will give you an overview of the best electric tankless water heaters available on the market, so you can make an informed decision when it comes to heating your home efficiently.

Discover which features and specs make each heater ideal for whole house use!

Best electric tankless water heater for whole house 2023

  1. Stiebel Eltron water heater
  2. BISELONG water heater
  4. Rheem AP430SS,water heater

1)Rheem RTEX-24 water heater

Check Latest Price

The Rheem RTEX-24 water heater is ideal for smaller installations, as it has a modest 5.9-gallon capacity. Installation is easy thanks to the NPT water connections. A convenient ON/OFF switch allows you to switch it on and off at your convenience. The temperature display gives you accurate readings about the water temperature and helps you control it for consistent, continuous hot water.

The heater also features a self-modulating functionality which helps it to maximize energy savings.Overall, this heater is perfect for anyone who needs a small, efficient water heater. The ON/OFF switch, temperature display and self-modulating feature provide convenience and reliability, while its NPT water connection and 5.9-gallon capacity make installation and use quick and easy. The heater’s ability to provide consistent, continuous hot water ensures it can handle small-scale jobs with ease.

Check Latest Price

2)ECOTOUCH water heater

Check Latest Price

The ECOTOUCH water heater is a superb choice for efficient and smart heating. With 240V/60Hz hardwiring, it is easy to install and self modulating for optimal output levels. The eco+$A$128 technology ensures it works efficiently and economically to conserve energy and money.

The digital display is easy to read and the temperature is adjustable for your convenience. Besides, it is made of high-quality material, making it durable and reliable. On top of that, it has a great design and features built-in safety measures to guarantee your safety. All in all, it is a fantastic choice for those who are looking for a sufficient, eco-friendly, safe and durable water heater.

Check Latest Price

3)BLACK+DECKER water heater

Check Latest Price

The BLACK + DECKER water heater is a reliable appliance for a busy family. With a 7.3GPM and 36kW power rating, it heats and delivers water fast, perfect for a big household that needs hot water on demand. The digital temperature display is an added bonus, which makes it possible to customize the amount of heat required for a shower, for instance.

By saving this information, you can enjoy a more comfortable experience with each shower. The appliance also has an automatic function to save money by limiting the water and electricity used. In short, this water heater is a great choice for those who need an efficient and reliable device that will save them money on their utility bills.

Check Latest Price

4)Stiebel Eltron water heater

Check Latest Price

Stiebel Eltron water heaters provide fast and efficient hot water solutions in any setting. They come with an impressive 18,000 Watts to quickly power users’ needs. Of particular note is its Continuos model, the Tempra 24 Plus, which utilizes 24 kW of power and 240 volts for a fast and consistent 140°F of pure hotness. This incredible machine is both practical and efficient, making it a great addition to any home or office.

Its ease of installation and low maintenance make it the perfect choice for those seeking fast and reliable hot water for their needs. It is also extremely durable and designed to last for years of use without any issues or breakages. All in all, Stiebel Eltron water heaters provide an impressive combination of fast and consistent water temperature, long-term reliability, and ease of installation, making them a top choice for buyers who are looking for a hot water solution that can deliver results.

Check Latest Price

5)BISELONG water heater

Check Latest Price

Biselong water heaters have some great features that make them stand out from the competition. The Gary-9Kw water heater is a perfect example, with its Smart Inverter technology, which offers powerful and efficient performance. This inverter also boasts durability, with its high-grade titanium atoms ensuring longevity.

Additionally, 116°f of hot water is available with this water heater, allowing you to take advantage of the higher water temperature. The BIS09 water heater is also a great option, with its 9kw of power allowing you to get just the right amount of hot water without over-heating. All in all, the Bisalong water heaters offer excellent features and performance, making them a great choice for anyone looking for an efficient and reliable solution.

Check Latest Price


Check Latest Price

The GE18SNHPDG Heater is an ideal choice for use in today’s modern homes. It features an intuitive interface that includes a touch-screen panel, a 3.8 gallon system, and is available in a Diamond Gray color. It has a thermostat control that allows it to be set up to 72˚F and an ECO setting that automatically senses and adjusts temperature to save energy.

The instant hot water facility ensures that you will have hot water ready whenever you need it, plus the convenience of being able to control the temperature easily with one-touch access. The device is incomparably efficient in terms of both energy consumption and performance. It is definitely one of the must-have appliances in any modern home.

Check Latest Price

7)Rheem AP430SS,water heater

Check Latest Price

The Rheem AP430SS water heater is an excellent product, offering an efficient and reliable method of heating large amounts of water. It boasts an impressive 18,000 watts of power and comes with a thermostatic control feature, allowing you to precisely adjust the temperature to suit your needs. The copper components provide great durability, while the 3/4 inch NPT ensures good water pressure.

The additional use of polyphosphates ensures that the water is softened, increasing its life span and providing peace of mind. Finally, the unit comes with a Wind Powered feature, which can be used to lower energy costs by running the heater without any electricity. In conclusion, the Rheem AP430SS is an excellent choice for anyone wanting a reliable and affordable water heater that comes with great efficiency.

Check Latest Price

Best electric tankless water heater for whole house 2023-Complete Buying Guide

Photo Source :

Welcome to our Complete Buying Guide for the Best Electric Tankless Water Heaters in 2023. Today’s technology has enabled us to use tankless water heaters, which are significantly more efficient than traditional electric hot water tanks. We have researched and compiled all the important information you need in order to decide on which of these products will be the best fit for your needs.

In this guide, we will talk about the differences between electric and gas tankless hot water heaters, along with a few other factors that can help you make an informed decision when it comes time to buy. We will also cover certain features and specs of each product, such as flow rate and BTU rating, as well as preferences when it comes to size and warranty coverage.

Explanation of electric tankless water heaters

Electric tankless water heaters are an efficient, cost effective solution for providing hot water in the home. Unlike traditional tank-style water heaters, electric tankless models heat water on demand, meaning that hot water is always available when needed without energy being wasted first heating and storing a large tank of hot water. Electric tankless units also save space as they do not require the installation of a large storage tank.

The typical electric tankless model requires an increase in incoming electrical service of up to 200 amps and a dedicated wire to provide the needed power. This style heater uses sophisticated electronics to monitor incoming flow rates and depending on the model may shut down if flow rates become too low to operate efficiently or too high for safety reasons. It is important to understand that there may be a greater initial cost associated with this style heater due to both equipment costs and upgraded electrical service upgrades; however, these are typically outweighed by the advantages in lowered energy use and improved efficiency over taking advantage of one value-priced promotion after another on big box store units.

When looking at electric tankless water heaters make sure that you look at size of heater (in gallons per minute or GPM) necessary for your household’s needs rather than just comparing prices alone. The size should take into account type and number of faucets needed simultaneously (i.e., showers, laundry machines), location(s) these appliances need their heated water (how far away from where heater will be located), as well as local climate/water temperature trends year round as colder climates may require additional backup with either inline booster heating element or cold climate compatible model specifically designed with special components such as power vents/exhaust fan motors ensuring safe released outdone gas expansion).

Importance of choosing the best electric tankless water heater for whole house

Photo Source :

Because the electric tankless water heater for whole house needs to provide hot water to your whole house, it is very important to find and install the best electric tankless water heater that will provide enough hot water and be able to handle the load of your entire home.

The best electric tankless water heater for Whole House should:

  • Provide high flow rates
  • Require little maintenance
  • Have efficient performance with low operating costs
  • Last a long time
  • Be easy to use and install
  • Be suited for both indoor and outdoor use
  • Include multiple safety features
  • Come with all necessary installation accessories like venting kits, thermostats and more.

Finally all models should come with a good warranty since an electric tankless system typically lasts 20 years or even longer. A good warranty is always a smart purchase since it provides piece of mind in case there are any surprises down the road.

Purpose of the guide

This guide is designed to provide you with all the information you need when selecting the right electric tankless water heater for a whole house in 2021. This guide will discuss the different types of tankless water heaters, their features, benefits, cost considerations and installation requirements to help you make an informed decision.

It’s important to understand how a tankless water heater works and what size and type are appropriate for your particular needs before making a final purchase. This guide has been created to help you find the best possible electric tankless water heater for your home in 2021.

Factors to consider when choosing electric tankless water heaters

When choosing an electric tankless water heater, it is important to consider several factors that can influence the effectiveness and efficiency of the unit. This includes the size and power requirements of the unit, as well as its features. Additionally, it is important to know how much hot water you will need at a given time, and what type of delivery system you would like your hot water to take. The following section looks into each factor in greater detail.

  1. Size and Power
    • The size and power of an electric tankless water heater should be chosen according to the amount of hot water that it can provide for your home or business needs. Most units are rated by their gallon-per-minute (GPM) capacity; this measurement tells you how much hot water the unit can supply at one time. It is important to choose a unit that can adequately satisfy your needs without overloading the system, as this could lead to decreased efficiency or performance issues.
  2. Features
    • When selecting an electric tankless water heater for your home or business, consider which features are included with the unit. Some models may come with additional accessories such as adjustable temperature controls or additional safety features such as a built-in shutoff valve if temperatures exceed safe levels. Additionally, some models may include a timer so that they can be programmed automatically to turn on at specific times throughout each day in order to save energy costs by only heating when needed.
  3. Delivery System
    • An electric tankless water heater can deliver hot water either through dedicated pipes or through storage tanks which store heated water until needed by faucets or appliances in different parts of a building.

Flow rate

Flow rate is an important factor for selecting the right electric tankless water heater. It describes how quickly a heater can deliver hot water, measured in gallons per minute (GPM).

To determine the required GPM value you will need to measure your peak hourly demand – the maximum amount of hot water you need at any given time. Flow rate also affects how many simultaneous users and appliances can be served by a water heater.

For whole house purposes, we recommend using a heater with at least 10 GPM and that can fluctuate from 8 GPM to 12 GPM depending on the volume of usage needed. Any lower than this for whole house purposes could result in uneven temperatures or reduced delivery of hot water, especially to multiple fixtures being used simultaneously.

Temperature rise

Before making a purchase, you should also consider the temperature rise of your proposed electric tankless water heater. As the name implies, temperature rise is the amount of temperature increase from incoming cold water to outgoing hot water. It is important because it determines how much hot water will be available when multiple outlets are used at once. Make sure that you choose an electric tankless heater with a temperature rise suitable for your home.

There are many factors that can affect temperature rise such as:

  • Incoming and outgoing water temperatures
  • Flow rate of each appliance being used
  • Efficiency rating of your heater and other appliances connected to it.

Generally speaking, the higher the incoming water and outlet temperatures, the lower the total temperature rises for each appliance or combination of appliances being used simultaneously.

Top electric tankless water heaters for whole house in 2023

It is important to know what features to look for when searching for the right tankless water heater for a whole house. The following tankless water heaters have been identified as the top models in 2023 based on their features and performance.

  1. Rheem RTEX-13 Electric Tankless Water Heater – This model from Rheem boasts a 13kW heating element that can provide up to 3 GPM of hot water. This heater also has digital controls for easy temperature adjustments and self-modulating technology that helps keep energy costs low. It is UL listed for outdoor installation and comes with a 5-year limited warranty.
  2. EcoSmart ECO 18 Electric Tankless Water Heater – This eco-friendly model from EcoSmart provides a powerful 18kW heating element, enough to provide 4 GPM of hot water on demand, plus it has self-modulating technology which gives it an Energy Star rating as well as low cost maintenance and operation. Plus, its small size allows it to fit most standard cabinets or closets – so there’s no need for extra space in your home to install your new heater! It also comes with a 12-year limited warranty so you can have piece of mind while enjoying your hot water needs all year round.
  3. Bosch Tronic 5000C Electric Tankless Water Heater – The design of this Bosch model offers high efficiency operation and can be used indoors or outdoors depending on your needs and preferences. Additionally, the Bosch Tronic 5000C boasts a 6 GPM flow rate as well as digital controls that makes temperature adjustments easy and convenient. With its 7-year warranty, this electric tankless water heater will provide families with many years of reliable hot water service!
  4. Rheem RTEX-18
  5. Rheem RTEX-18 Electric Tankless Water HeaterBest Overall – This electric tankless water heater is known as one of the most reliable and well-built models out there. It comes with a sleek, compact design and it can provide up to 4 GPM (gallons per minute) in hot water flow rate. It is easy to install and comes with a digital temperature control that allows you to set the temperature in increments of 1°F and has cooling functionality as well. The built-in self-modulating technology ensures that you’re only using energy to heat the exact amount of water that is needed which helps you save both in terms of energy use as well as your monthly utility bill.

Moreover, this model comes with a 12 year warranty for residential uses and 5 years for commercial use, making it one of the best tankless electric water heaters for whole house in 2023.

Stiebel Eltron Tempra Plus 24

The Stiebel Eltron Tempra Plus 24 is a great choice if you are looking for an electric tankless whole house water heater. It offers a robust design with a built-in temperature control system, making it one of the most reliable and efficient models available. It’s able to heat up to 20 gallons of water per minute, meaning it can easily handle multiple hot water needs in your home at once.

It also features a user-friendly digital LCD display that provides accurate information about temperature, power use, and more. Unlike other models, this one comes with an included card for access to Stiebel Eltron’s Energy Monitoring System (EMS), which lets you manage your energy usage even when away from home. Additionally, it has an Eco setting which saves on energy costs without sacrificing too much hot water performance.

With a generous 6-year warranty and high efficiency ratings (98%+ cost savings compared to tank-type heaters), the Tempra Plus 24 is an excellent option for whole house water heating needs.


In conclusion, it’s important to consider your needs before purchasing a tankless water heater. Determine the size of your home, how much space is available for installation, and how many faucets you need to supply with hot water. It is also essential to choose a model with enough capacity built in to provide all of your hot water needs without experiencing a drop in temperature when multiple faucets are running simultaneously.

Once you’ve determined the size and type of electric tankless water heater needed for you home, you can start researching available models online and compare their features. Make sure the model you select meets industry standards for safety and efficiency as well as any local building codes that may be applicable. With an electric tankless water heater, you can rest assured that there will always be plenty of hot running water available without ever having to worry about running out or having to store a large amount of hot water in an inefficient tank.


Can an electric tankless water heater heat whole house?

Yes, an electric tankless water heater can heat a whole house if it is large enough. However, this can be extremely expensive and may not be the most cost-effective way to heat a house. Additionally, a tankless water heater requires a lot of electrical power in order to operate efficiently. For larger homes, it is often more economical to install multiple smaller tankless water heaters at various locations around the house.

What brand of electric water heater is the most reliable?

There are many reliable brands of electric water heaters, including A.O. Smith, Rheem, Bradford White, and American Standard. The best brand for your needs depends on a variety of factors, such as your budget, the size of your household, and your geographical location.

Which water heater brand is best?

It is difficult to say which water heater brand is best since there are numerous factors to consider, including energy efficiency, warranty coverage, and cost. Therefore, it is recommended that you research a few different brands and read customer reviews in order to determine which water heater is best for your specific needs.

How to choose a tankless water heater?

  1. Determine your hot water needs: Calculate the peak hot water demand in the house before deciding to buy a tankless water heater.2. Estimate fuel availability and cost: Determine which type of tankless water heater (gas or electric) makes more sense for your home depending on fuel availability, cost, and local codes.3. Consider the size of the unit: Size the tankless water heater according to the water needs of the house. Make sure to get the right size for maximum efficiency.4. Evaluate features and technologies: Look into features like automatic shut-off, flow rate, temperature control, and safety features. The more features, the higher the cost.5. Research maintenance requirements: To ensure your water heater runs at its highest efficiency, plan on regular maintenance.6. Check energy efficiency ratings: All tankless water heaters will have an energy efficiency rating. Look into this before making your purchase.

What is the number 1 hot water heater?

The number one hot water heater is the Rheem Marathon Electric Water Heater. This top-rated water heater features a lifetime warranty, an impressive energy efficiency rating, and a patented magnesium anode rod to help protect the tank from rust. It is also equipped with a self-cleaning design to help keep it running optimally.

How long do electric tankless water heaters last?

Electric tankless water heaters can last up to 20 years or more with proper maintenance.

What is one disadvantage of a whole house tankless water heater?

One disadvantage of a whole house tankless water heater is that they use a lot of electricity to heat up the water quickly, resulting in higher energy costs. Additionally, because of the instantaneous water heating and lack of a storage tank, large households could experience a decrease in water pressure when multiple fixtures are running at once.

Do tankless water heaters increase electric bill?

Yes, tankless water heaters can potentially increase your electric bill, especially if your family is using a lot of hot water. Tankless water heaters heat water on demand, meaning they’re running more often than traditional water heaters. Additionally, tankless water heaters are more efficient than traditional water heaters, but they still draw more power than traditional heaters when they’re in use. For this reason, your electric bill may increase with a tankless water heater.

What are two disadvantages of a tankless water heater?

  1. Tankless water heaters can be quite expensive and require significant upfront costs.2. They require dedicated power for operation, and typically, the more powerful models require high voltage to operate. This require professional installation and may necessitate the need to upgrade your electrical infrastructure.

Are there problems with tankless water heaters?

Yes, there are several potential problems with tankless water heaters. Common issues include clogging, control board failure, mineral buildup, inadequate water pressure, and electrical malfunctions. Additionally, tankless water heaters require more maintenance than traditional tank water heaters and have higher initial costs.

Leave a Reply