Best Electric Tankless Water Heater Reviews in 2022

Conventional tank water heaters are great if they are pre-existing with your house but they take up a lot of space and they are not that efficient.

This is why people are switching to tankless electric water heaters, as they are compact, lightweight, efficient, and reliable too.

To help you find the best product, we have researched many water heaters according to their GPM, power rating, and much more. After rigorous research, we chose the best of them and compared them so you can choose the right water heater for your needs.

Best Electric Tankless Water Heater
Stiebel Tempra 24 (Best Overall) Power Rating: 24 kW Suitable House Size: Large Max. Flow Rate: 4.68 GPM @ 35°F Rise Weight: 16 Pounds Warranty: 7-year on leakage and 3-year on parts
Sio Green SIO18 (Most High-end & Durable) Power Rating: 18 kW Suitable House Size: Small-Medium Max. Flow Rate: 3.07 GPM @ 40°F Weight: 28.3 Pounds Warranty: 10-year on heating chamber and 3-year on parts Special Feature: It uses Quartz elements to heat water so there is no corrosion and no need to replace heating element periodically
Titan N-120 (Cheapest yet Quality Water Heater) Power Rating: 11.8 kW Suitable House Size: Small-Medium Max. Flow Rate: 3.0 GPM @ 35°F Weight: 8 Pounds Warranty: 10-year on heat exchanger and 1-year on parts
Stiebel 230628 Power Rating: 12 kW Suitable House Size: Small-Medium Max. Flow Rate: 2.34 GPM @ 30°F Weight: 5.9 Pounds Warranty: 7-year leakage and 3-year on parts
Rheem RTEX-24 Power Rating: 24 kW Suitable House Size: Large Max. Flow Rate: 5 GPM @ 33°F Weight: 17.8 Pounds Warranty: 7-year on heating chamber and 1-year on parts

The Best Electric Tankless Water Heaters

1. Stiebel Tempra 24 Plus Electric Tankless Water Heater

Stiebel Tempra 24 Plus is our top pick for the best electric tankless water heater as it comes with so many great features. Its advanced flow control technology automatically maintains the water temperature and if the hot water demand increases then it slightly reduces the flow so your hot shower will not be interrupted again.

One of the biggest advantages of electric tankless water heaters is that they are very sleek and compact thus you will save a lot of space. Moreover, auto-modulation technology saves energy, and its ability to control water flow reduces the electricity bill even further.

This model is rated for 24kW and requires a minimum electric service of 150-amps and the available temperature range is 86˚ to 140˚F. It comes with a 7-year leakage warranty and 3-year parts warranty.

2. Rheem RTEX-24 Residential Electric Tankless Water Heater

Rheem RTEX-24 is another great electric tankless water heater we have reviewed. It boasts the most advanced self-modulation system that adjusts the power to meet the hot water demand and it also maintains a constant temperature.

You can get the hot water from the bottom by using ¾-inch NPT connections and the digital display is very useful when you want to keep close tabs on the temperature level.

This unit has the highest flow rate of 5.9 GPM, which is enough for the whole house. The copper immersion heating elements are very durable and last quite a long. The weight of the unit is 17 pounds and it measures 4 x 18 x 19 inches.

3. Stiebel 230628 Tankless Electric Water Heater

Stiebel 230628 can be used as a single/multi-point-of-use or whole-house electric tankless water heater. However, as the temperature increases the flow rate will decrease so please check your needs before selecting this water heater.

Furthermore, the number of sinks it can supply depends on the temperature of incoming cold water, water flow rate through the unit and supplied voltage.

It is electronically controlled and can deliver the water at the temperature you need. This type of water heater has the highest efficiency because they don’t store the water and also it doesn’t require any venting.

The heating element is controlled by a flow switch, which means that the water heater will not dry-fire or fail permanently. Moreover, this unit is hydraulically controlled so the operation is much quieter.

You will get a 7-year warranty for any leakage and a 3-year warranty on parts.

4. Titan N-120 Electric Tankless Water Heater

Titan N-120 is for those who do not want to invest a whole lot of money in expensive electric tankless water heaters. This unit is very reasonably priced and it is intended for average size homes.

As you know, electric tankless water heaters are very energy efficient as they only heat the water when needed.

This unit is very compact and can easily be installed in confined spaces in your house. It is rated for 8 kW and the highest flow rate is 4 GPM. It weighs about 8 pounds and the required amperage is 54-amps.

The manufacturer is offering a 1-year warranty on electrical components and a 10-year warranty on water components.

5. Sio Green SIO18 Infrared Electric Tankless Water Heater

Sio Green SIO18 is different from a typical electric tankless water heater, here’s how. The typical water heaters heat the water through the metal surface so the corrosion accumulates on the surface of the heating element. Which is why you have to replace them periodically.

But in the case of the Sio Green SIO18, it energizes the water with quartz elements that create the heat without direct contact of metal surface for heating the water, which is why this water heater lasts very long.

To maintain the desired temperature of hot water, smart modulating technology constantly changes the temperature of the machine.

This electric tankless water heater offers 4 GPM of hot water flow rate at 30 degrees Fahrenheit and when the temperature increases, the flow rate decreases. It needs 18kW of energy and the amperage capacity is 80-amps.