7 Best Electric Tankless Water Heaters – (Save Space & Money with a More Efficient Unit)

If you are weighing your options between tankless water heaters, you are probably trying to decide if an electric tankless unit is in your future. If you already have the capacity in your electrical hookup and circuit breaker to add an electric tankless water heater, then you may be well on your way to an easy choice.

Electric tankless water heaters are usually highly efficient, with some boasting an impressive 99% efficiency. If you can find a place to install an electric tankless unit on a wall near hot and cold water lines, and can hardwire the unit within a reasonable distance, it’s a good choice for your home. You will definitely save space over a conventional water heater tank, freeing up that precious floor space for storage or maneuverability in your utility area. Here’s a list of seven electric tankless water heaters that we have reviewed for your convenience.

  • 4.5 Customer Rating
  • Stiebel Eltron 224199
  • Dimensions: 21.7 x 20.1 x 9.6 inches
  • Flow Rate: 0.50 GPM
  • Power Source: Electric-Powered
  • Weight: 16.1 pounds
  • Made In: USA
  • Warranty: Manufacturers
  • 4 Customer Rating
  • Ecosmart ECO 36
  • Dimensions: 17 x 19 x 3.8 inches
  • Flow Rate: 3.5 GPM
  • Power Source: Electric-Powered
  • Weight: 18.35 pounds
  • Made In: USA
  • Warranty: Manufacturers
  • 4 Customer Rating
  • Ariston GL4S
  • Dimensions: 13.8 x 13.5 x 13.8 inches
  • Flow Rate: 4.0 GPM
  • Power Source: Electric-Powered
  • Weight: 23.1 pounds
  • Made In: Italy
  • Warranty: 6-year warranty, 1 year on parts
  • 2.5 Customer Rating
  • Chronomite SR-30/208
  • Dimensions: 9.6 x 2.8 x 6.2 inches
  • Flow Rate: 1.0-GPM
  • Power Source: Electric-Powered
  • Weight: 4.25 pounds
  • Made In: USA
  • Warranty: Manufacturers
  • 4 Customer Rating
  • Ecosmart ECO 18
  • Dimensions: 3.6 x 14 x 17 inches
  • Flow Rate: 2.5 GPM
  • Power Source: Electric-Powered
  • Weight: 14 pounds
  • Made In: USA
  • Warranty: Lifetime
  • 4 Customer Rating
  • EcoSmart ECO 11
  • Dimensions: 6.5 x 13.5 x 10 inches
  • Flow Rate: 0.3 GPM
  • Power Source: Electric-Powered
  • Weight: 6.5 pounds
  • Made In: USA
  • Warranty: Lifetime Warranty

Stiebel Eltron Tempra 24 Plus Electric Tankless Whole House Water Heater

Rest assured, if you are willing to break away from traditional tank water heaters and try an electric tankless for your whole home, you will not be disappointed with the Tempra 24 Plus from Stiebel Eltron. This unit would be good for a small family in a mid-sized home with a medium budget. You can expect to save anywhere from 15-20% on the hot water portion of your electric bill. Depending on your usage habits, your savings could be even higher.

The digital temperature controls on the Tempra 24 Plus are foolproof and let you set the temperature to your exact liking. You will always know the exact temperature the unit is set to, and it is easy to see if it has been changed or tampered with. With the Tempra technology, the Tempra 24 Plus maintains a consistent hot water temperature, no matter the demand or length of water use. For this unit, you can expect to run either two showers or a shower and a washing machine at the same time. The GPM can range from 1.5 to 4.5, based on demand.

At just over 15 pounds and 21.5 x 19.5 x 8.8 inches, this tankless water heater takes up much less space than traditional water heater tanks. The Tempra 24 Plus does require a minimum circuit breaker space of a double pole 2 x 60. While the unit is reasonably priced, if you are considering purchasing this model, please be sure to factor in the cost of installation by a professional and/or any electrical work or upgrades that might need to be done. For your convenience, the Tempra 24 Plus does come with a three-year limited warranty (but the product must be installed by licensed personnel).

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Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater

The Eco 36 is the largest power option available in the line of EcoSmart electric tankless water heaters, but it still saves much more space over a typical water heater tank at 17 x 19 x 3.8 inches. At the middle of the price range, it is an economical choice. However, the installation is not going to be as easy as switching out your old tank and putting this in its place. Please be sure to factor in the cost of the copper water line parts, electrical wiring, as well as circuits and possible electrical upgrades.

For installation, this unit requires a 4 x 40 double-pole draw and 150 amps of dedicated service on the circuit breaker. This unit also requires your home to have 200 amps of total electrical service. If you are unsure about the electrical setup of your home, ask a professional electrician to look over your plans before purchasing this tankless water heater. You do have the option of hooking up anywhere from 1 to 4 of the double poles on your electric panel, but obviously this will affect how much output your heater can give your home.

Similar to the Rinnai RL94eP, the Eco 36 has self-adjusting technology that will simply change its energy output during the highest demand times. The Eco 36 also offers a digital thermometer panel for your convenience, and allows you to adjust the temperature to either Fahrenheit or Celsius.

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Ariston GL4S Electric Mini-Tank Water Heater

For those who would like to try a point-of-use water heater, this Ariston GL4S model is one of the easiest to install. Simply plug the unit into the wall near the sink—no hard wiring required. Use the cold water line to attach this mini heater, and you are ready to go. It holds 4 gallons of hot water right at the faucet where you will need it. It is virtually effortless to get your hot water quickly.

This updated version of the Ariston GL now has a sensing probe that more accurately maintains the proper temperature and can adjust the temperature more quickly. The manufacturer does offer a six-year limited warranty on the heating exchanger and a one-year limited warranty on the parts.

Because of its small size and power needs, this mini tank is about half the price of the lowest-priced electric tankless units on our list. For installation, you will need enough room for the 14 x 14-inch dimensions. This tank would work well for you if you have a sink that is far from your hot water heater, and it takes a long time to run the faucet and get hot water to the tap. Other good uses include your kitchen sink or near a large jacuzzi tub or shower with multiple sprayers.

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Chronomite SR-30 208 HTR 208-Volt 30-Amp SR Series

Some homes would really benefit from a point-of-use tankless water heater like this Instant-Flow version from Chronomite. If you have a sink that is located in an upstairs bathroom far from your water heater, or if you want hot kitchen water right away, consider this version that only uses 30 amps of energy.

The Chronomite SR-30/208 HTR sits at a nice low price point thanks to its 1.0-GPM flow rate and its 9.6 x 2.8 x 6.2 inch dimensions. It should fit easily under a kitchen or bathroom cabinet and be hidden away from sight. For installation, this unit has two mounted chrome compression fittings and uses 3/8-inch cold water inlet and outlet connections. To hook up the electrical portion, simply punch out the rear electrical knock-out and you will have access to the wiring.

Chronomite can boast about their microprocessor technology, which delivers instant hot water in two seconds instead of the standard six seconds of their competitors. You can pre-set the technology to your desired temperature to prevent accidental burns or scalding. This feature is especially helpful for homes with small children or for those sleepy early mornings. If you choose the Chronomite, you will be more efficient with your electrical use and also reduce your hot water delivery time.

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EcoSmart ECO 18 Electric Tankless Water Heater

The EcoSmart ECO 18 gives consumers a sizeable draw of hot water with a flow rate of about 2.5 GPM. This should be adequate for a large apartment or townhome, or even possibly a small home with moderate water needs. If you are in a colder climate, the ECO 18 can handle powering one shower and one sink at the same time. In warmer climates, it should be able to heat water for two showers and two sinks.

The ECO 18 sits in the middle of the price range. By its name, the ECO 18 does pull 18 kilowatts for its power needs, draws 75 amps, and requires two 40 double-poles for installation. EcoSmart’s sizing offering is based on a 240-volt electrical service. Be sure to check your existing electrical panel to ensure you have adequate electrical draw space for the ECO 18.

With a 50-60% saving on water heating costs, the ECO 18 should help you reduce your electric water heating bill fairly quickly. This unit will also save a sizable amount of space in the utility area, coming in at 17 inches high, 14 inches wide, and 3.75 inches deep. Especially if you’re removing an existing tank, it would be nice to have that extra space for storage or ease of access to other utilities in your basement or utility closet.

An electric hot water heater from EcoSmart will also give you one of the most extensive product warranties on the market. If you’re new to tankless water heaters, a reputable manufacturer may be important to you. Customers are very happy with the customer service support from the team at EcoSmart—technicians are easily available to help with sizing, installation, and maintenance questions.

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EcoSmart ECO 11 Electric Tankless Water Heater

If you have lower hot water needs but still want the ease of an electric tankless, the EcoSmart ECO 11 is ideal for a small apartment-sized space. The ECO 11 can be used for multiple or single applications depending on your climate. You can expect it to provide hot water for two faucets at 1.3 GPM in cold climates, or a shower and two faucets simultaneously in warmer climates at 2.7 GPM.

Expect the ECO 11 to pull 13 kilowatts for its power needs. It draws 57 amps and requires a 60 double-pole for installation. EcoSmart’s sizing offering is based on a 240-volt electrical service. Be sure to check your existing electrical panel to ensure you have adequate electrical draw space for the ECO 11.

With a 50-60% saving on water heating costs, the ECO 11 should help you reduce your electric water heating bill fairly quickly. Because it does run at a smaller capacity, the price point is very reasonable. In fact, this is one of our cheapest electric models for tankless water heaters. This unit will also save a sizable amount of space in the utility area, coming in at 6.5 x 13.5 x 10 inches. Especially if you’re removing an existing tank, it would be nice to have that extra space for storage or ease of access to other utilities in your basement or utility closet.

An electric tankless hot water heater from EcoSmart will also give you one of the most extensive product warranties on the market. If you’re new to tankless water heaters, a reputable manufacturer may be important to you. Customers are very happy with the customer service support from the team at EcoSmart—technicians are easily available to help with sizing, installation, and maintenance questions. EcoSmart offers a lifetime warranty on the electronics, the stainless steel exchanger, and the heating element.

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EcoSmart ECO 27 Electric Tankless Water Heater

To make certain the ECO 27 fits your home, go check your electrical panel and be sure it is at least 200 amps. Next, you’ll need three 40-amp double poles available inside for the hard wiring of the ECO 27. This EcoSmart ECO 27 has a max draw of 27 kilowatts at 240 volts, so it will use quite a bit of electricity when it is running. The best part about this tankless water heater, though, is that the ECO 27 will shut off when there are no hot water demands in the house.

This nice tankless heater falls right in the middle of the price range for tankless water heaters, and would be a good fit for a mid-sized home with average hot water needs. At just 17 x 17 x 3.5 inches, you will not only save anywhere from 50-60% on your hot water heating portion of the bill, but you’ll also save ample space in your utility area. With GPMs ranging from 2.6-6.5, this ECO 27 will power one shower and two faucets in colder climates and a low GPM flow rate, or four showers and a faucet in the warmest climates with a higher GPM flow rate.

Customers are very happy with the customer service support from the team at EcoSmart—technicians are easily available to help with sizing, installation, and maintenance questions. EcoSmart offers a lifetime warranty on the electronics, the stainless steel exchanger, and the heating element.

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Summary

If your home has the electrical capacity to wire an electric tankless water heater, it will likely be a worthwhile investment for your future energy savings. Let’s say that your family has high hot water needs—in your case, the limitless supply of hot water would save a lot of headaches in an era of modern convenience.

Based on what climate you live in, you might need more or less energy to heat the water in your home. Also, how many showers and hot water taps you have will influence the size of tankless heater you need, so be sure to do your research into the manufacturer’s specifications and recommendations for your home. Depending on the typical energy costs of your region, water or gas may be expensive, and making the switch to an electric tankless water heater could help you realize significant savings.

The other benefits of electric tankless water heaters are their space-saving capability over conventional hot water tanks, and the simple ease of temperature control located on the front panel. You also don’t have to worry about any venting with electric units, and their energy efficiency is rather high (some at 99% or higher).

The main drawback of electric tankless water heaters is obviously the significant electrical needs of the heater. If you have an older home, your electrical panel might not have enough capacity to run the heater. Or, if you have other large appliances that are already drawing large loads, you might not be able to dedicate the necessary ampage for the tankless heater. If you live in a region with high electricity costs, it might be worth looking into a gas-powered tankless water heater to see if those savings would be more beneficial for you.

The cost of the electrical wiring and parts (if not included with the unit from the manufacturer), and the copper piping and fittings to refit to your new tankless heater, could cost anywhere from $200-300. If you are using a professional plumber to install the unit, you also have to factor in labor costs. When you add all of these factors up, the total could be close to the cost of a more expensive gas-powered unit. It is highly recommended to install a water filter and do annual maintenance on the unit to ensure the parts don’t corrode. If you do not, the lifespan of your tankless heater will be greatly diminished, and you will likely void any rights you might have had under the manufacturer’s warranty.