Tankless Electric Water Heaters For Whole House 2023

Are you tired of constantly running out of hot water in your home? Are you looking for a more energy-efficient way to heat your water? Look no further than Tankless Electric Water Heaters For Whole House. These electric heaters provide a steady stream of hot water on demand, without the need for a storage tank. Not only do they save energy by only heating water when it’s needed, but they also take up less space and have a longer lifespan than traditional tank-style water heaters. Whether you’re looking to upgrade your current water heater or install a new one in a new home, a tankless water heater may be the perfect solution for your whole house.

Tankless Electric Water Heaters For Whole House

We have spent a good two months researching the best electric heater for the whole house. There are a variety of categories of tankless water heaters available for the whole house as per the demand of customers and their satisfaction. We have enlisted the best electric water heaters based on their best performance, max temperature, water heating efficiency, and maximum water flow rate.

We have tried products of different price ranges. And bring their honest reviews for you, to make it easier for you to choose the best tankless water heaters for the whole house. So, let’s get started.

1. Stiebel Eltron Tankless Electric Water Heaters (Best overall)

Stiebel Eltron Tankless Electric Water Heaters


Stiebel Eltron Temper 36 plus is a German-manufactured, compact electric tankless water heater that is designed to substitute a 60-gallon electric tank-style water heater.

I consider the Stiebel Eltron Temper 36 plus instant water heater in terms of powerful voltage and efficiency. Moreover, it will also provide you with a maximum of 7.5GPM of hot water flow which is enough for four showers running at the same time. This feature makes it best for meeting your whole family’s hot water needs.

Features that make this product shine:

Nothing is 100%perfect, but this electric instant tankless water heater provides you with 99.99 per cent efficiency, making it a top choice for many consumers. In addition to this, this tankless electric water heater will provide you with 140 degrees of temperature, which is higher than the department of energy’s recommendations.

Also, it has an Auto modulation technique that gives your system temperature stability without any fluctuations. This system follows the preset memory of preferred memory.

  • Silent operation.
  • Self-diagnostic system for troubleshooting.
  • Small compact size.
  • There is a seven-year warranty for leakage and a three-year warranty for material defects.

  • Despite its auto modulation technology, some customers still report experiencing cold water sandwiching issues with this product.

Why should you buy Stiebel Eltron Electric Tankless Heater?

You should buy the  Stiebel Eltron tankless electric heater due to its impressive 99.99% efficiency, and almost all of the energy used to heat the water is transferred to the water itself, rather than being wasted.

2. EcoSmart ECO 27 Tankless Water Heater (Best warranty)

EcoSmart ECO 27


The second product that we tested was the ECO Smart ECO 27 Tankless Water Heater. The ECO series of tankless water heaters are among the most appealing and popular. This tankless water heater series is well known for its appealing warranty, which makes it different from all other tankless instant water heaters.

Features that make this product shine:

ECO Smart ECO 27 tankless water heater ensures a continuous and consistent hot water supply. One main difference that we noticed using this water heater was in electricity bills.  Moreover, by using this water heater, you can save up to 50% of your energy and water heating cost.

This water heater has a 6.6 GPM, hot water capacity. This feature makes it suitable for apartments and townhouses. This electrical water heater has perfect dimensions and sizes to fit in small places. unlike traditional tanks that take up lots of space to accommodate, this ECO Smart water heater’s sleek design makes it easy to mount on the wall, its small size frees up floor space.

On-demand heating system makes it the most time-saving product cutting down the need for hot water this allows us to avoid energy and water wastage.

  • Self-modulation.
  • Endless hot water.
  • Energy saving.
  • Appealing warranty.
  • Corrosion may be caused in case you do not service your water heater at least once a year but proper maintenance reduces the chances.

Why should you buy EcoSmart ECO 27 Tankless Water Heater?

If you are interested in buying an electric tankless water heater for your whole home, then the ECO smart ECO 27 is a great choice. This energy-efficient tankless water heater has a digital thermostat for perfect temperature control, and it also comes with the best warranty for added peace of mind.

3. Rheem RETEX-13  Self-Modulating Electric Tankless Water Heater

Rheem RETEX-13  Self-Modulating Electric Tankless Water Heater


Rheem Retex -13 self-Modulation electric tankless water heater is also our best pick for the overall best budget-friendly product. A feature that attracted us the most is its small size. Therefore, it can fit easily anywhere in your home. It is so quiet that you can hardly notice that it is working.

Features that make this product shine:

This instant water heater will provide you with instant and continuous hot water flow for up to 2 showers. This water heater is designed to be energy efficient, which can help reduce your energy usage and lower your bills.
Rheem Retex -13 self-Modulation electric tankless water heater is best for your whole house, offices, Residential vehicles (RVs), and for boats too.

Unlike other water heaters we reviewed that heat up water at 140 degrees, we adjusted this tankless water heater’s temperature to 95 degrees. And literally, it worked great as there was no need of adding cold water while showers to normalize the high water temperatures. In this way, we can reduce too much unnecessary stress over pipes and heaters while overheating water up to 140 degrees. By heating the water to a lower temperature, we can reduce stress on the electricity bills and increase the lifespan of the system.

Rheem series has wide experience in gas and electric water geysers. Raheem Retex instant electric water heater has high-quality RTEX-18 rated for 4.4 GPM with advanced self-modulation technology, which helps to automatically maintain the desired water temperature. This water heater can heat water up to 110 degrees Fahrenheit. Brass-topped heating elements make it product highly durable.

  • Continuous flow.
  • Net electricity saving.
  • Simple and easy installation.
  • Advanced self-modulation technology.
  • None.

Why should you buy Rheem RETEX-13  Self-Modulating Electric Tankless Water Heater?

I will highly recommend RETEX-13  Self-Modulating Electric Tankless Water Heater. It is a budget-friendly option that features a clear display and a large dial that will tell you a single-degree change in your water temperature. Its simple operating system also makes it a popular choice among customers

4. Eemax HA036240 240V 36 kW Electric Tankless Water Heater-(best performance)

Eemax HA036240 240V 36 kW Electric Heater


This is the product that I found for my friend as he has shifted to his new house and he asked me to help him buy a new tankless water heater for his new home. Coincidentally, my team was working on electric water heaters, so we took him along and bought the Eemax HA036240 Electric tankless heater for his home. And we got his reviews for the Eemax Electric tankless heater.

Features that make this product shine:

Experiencing the Emax Home Advantage water heater is not a disappointment at all. That was a perfect choice according to the reviews of my friend. What features appealed to us and prompted us to buy this product, along with the reviews? So, let us discuss them in detail.

This device is equipped with thermostatic control, responsible for controlling fluctuations in water temperature. Moreover, the thermo-optical sensor and predictive control algorithm plays role in effective heat management.

Emax Electric tankless water heater gives net electricity savings on electricity bills and keeps your water hot 24/7 due to the insulated body without charging you extra for electricity bills.

We found that this electric tankless water heater is super easy to install when we installed it. You can install it anywhere in your home but it’s better to install it near the point of use.

This electric tankless water heater offers up to 90% space savings and up to 99% thermal energy efficiency. A sophisticated Computerized micro-processing temperature control system is present to prevent overheating and to provide an unlimited hot water supply.

  • Computerized water processing control system.
  • 99% thermal energy efficiency.
  • Small portable size.
  • Easy installation.
  • Work brilliantly worth every dollar.

  • While it may be a bit expensive but its excellent performance makes it worth every dollar. Its brilliant performance is not a deal-breaker.

Why should you buy Eemax HA036240 Electric tankless heater?

We recommend you buy the Eemax HA036240 model because it is equipped with a sophisticated computerized micro-processing temperature control system that prevents overheating and ensures you an endless supply of hot water.

5. Bosch Electric Mini-Tank Water Heater (Best Mini Tankless water heater)

Bosch Electric Mini-Tank Heater


The Bosch Electric mini tank water heater was the last product that I reviewed. This product is budget-friendly, and you can find it at the most affordable price. The thing that I noticed about the Bosch Tronic mini tank electric heater is that it is not a typical electric tankless water heater.

In addition to this, it is a small, decent, and compact electric water heater that can easily be installed under your washing sink to provide hot water right where it is needed.

Features that make this product shine:

The Bosch Electric mini tank water heater has independent installation, and the 36-37″ cord plugs into a 120-volt outlet. The thermal efficiency of this product is 98%, and its body is constructed with premium glass-lined material that makes it long-lasting.

At last, Its fast recovery rate means you’ll be free of tension while waiting for hot water at your sink. This tankless water heater provides you with on-demand hot water.This small electric water heater is capable of providing hot water to two sinks simultaneously.

  • Hot water on demand.
  • Adequate kitchen hot water needs.
  • Easy mounting.
  • Installable in small spaces even under wash basins/sinks.

  • If not properly maintained, there might be water leakage.

Why should you buy Bosch Electric Mini-Tank Water Heater?

Bosch Electric mini tank water heater is highly recommended by us due to being suitable for multiple sinks. The small size and fast recovery rate of the Bosch Electric Mini-Tank Water Heater make it suitable for supplying hot water to multiple sinks simultaneously..


Can an electric tankless water heater heat the whole house?

Yes! Electric and gas tankless water heaters can perform water heating functions for your whole house, but this depends mainly on the size and capacity of your tankless water heater. Large-size tankless electric and gas water heaters are available for large families’ whole houses and smaller sizes are available to accommodate single rooms, taps, or appliances.

How big of a Tankless Electric Water Heaters For Whole House ?

A 6-7 GPM tankless water heater is suitable in case your home has 1 bathroom,8-9 GPM for 2 bathrooms, and 9-11 GPM for supporting 3 bathrooms of your home with hot water. For small studio apartments or small 1-bathroom in houses, 4-5 GPM units tankless water heater is enough.

What are the best whole-house tankless water heaters?

The Stiebel Eltron Electric Tankless Heater is considered one of the best whole-house tankless water heaters overall. The Stiebel Eltron Electric Tankless Heater is a high-quality water heater that provides hot water on demand for a whole house. It has a flow rate of up to 7.5 gallons per minute, making it suitable for homes with multiple bathrooms or high hot water usage. It is energy efficient and has a compact design, making it a great option for homes with limited space


In conclusion, tankless water electric heaters are a smart and efficient choice for providing hot water for a whole house. They offer a range of benefits, including on-demand hot water, energy efficiency, and a compact design. The Stiebel Eltron Electric Tankless Heater is a top-performing product that is well worth considering for your home. Whether you have a small studio apartment or a large multi-bathroom house, a tankless water electric heater can help you enjoy the endless hot water while saving money and energy. Make the switch today and start enjoying the benefits of a tankless water electric heater for your whole house.

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