20 Best electric tankless water heater

There are many reasons why people choose an electric tankless water heater over other options like gas and electric models. For one thing, electric tankless water heaters can provide hot water on demand. This means that you don’t have to wait for the hot water to be delivered by the water heater. Instead, you can have it when you need it most without worrying about having a complete tank of cold water at home. Electric tankless heaters also provide instant hot water unlike the gas models that take a longer time to heat up.

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EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology
3,037 Reviews
EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology
  • Endless On-Demand Hot Water; Consistent hot water when you need it that never runs out; Continuously monitored water temperature and controlled flow rates ensure efficiency and consistent performance within 1 degree of selected temperature
  • Save Space; EcoSmart tankless electric water heaters are 90% smaller than traditional tank heaters; may be installed on wall or at point of use; Dimensions 11.5 x 8 x 3.75 inches
  • Save Energy; EcoSmart tankless electric water heaters are 99% thermal energy efficient; Only heats water when called unlike a tank heater that maintains water temperature even when not being used.
  • EcoSmart ECO 11 Sizing; 13-kilowatt tankless electric water heater ideal for providing hot water for a bathroom, small sink, office breakroom and other point-of-use or low-flow applications; provides between 1.3 and 3.1 gallons-per-minute depending on the inlet water temperature; refer to the sizing guide to select the proper solution
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Rheem RTEX-18 18kW 240V Electric Tankless Water Heater, small, Gray
764 Reviews
Rheem RTEX-18 18kW 240V Electric Tankless Water Heater, small, Gray
  • External digital thermostatic control with LED display (+/1 degree accuracy)
  • Most advanced self-modulation, adjust power to meet hot water demand
  • Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
  • Simple installation – bottom 3/4 inch NPT water connections
  • Threaded for easy replacement, simple installation, digital temperature display
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ecosmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology,White
3,701 Reviews
ecosmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology,White
  • The product is highly durable
  • The product is easy to use
  • Manufactured in China
  • Amperage (amps): 75. Activation flow: 0. 3 GPM. Flow Rate @ 35 F Rise (gallons/min): 3. 51 gal (US)/min
  • The product works and is compatible with 2 X 40 AMP (DP) breakers and 2 X 8 AWG wire
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
348 Reviews
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
  • ON/OFF Dial Control with adjustable digital temperature display
  • Self-modulating power control
  • 24kW Model Flow Rate: up to 5.9 GPM for RTEX-24
  • Bottom 3/4" NPT water connections
  • On demand, consistent and continuous hot water
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Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater
426 Reviews
Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater
  • Sleek and compact design with digital output temperature display
  • ECOSMART tankless water heaters are 99.8-percent energy efficient
  • Manufactured in United States
  • Pipe Fittings:3/4 inch NPT
  • Required Breaker:4 x 40 A
Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
693 Reviews
Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
  • External adjustable digital thermostatic control with LED display (+/1 degree accuracy
  • Durable Copper immersion two heating elements, field Serviceable.Self-modulating power control
  • Simple installation – 1/2 NPT adapters included; side 1/2 inch Compression water connections
  • 99.8% energy efficient. External controls to adjust temperature in increments of 1°f. Water-Saver Shower Head – 1.5 GPM
  • Threaded for easy replacement, simple installation, digital temperature display 54 A. 13kW Model Flow Rate: up to 3.17 GPM
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Stiebel Eltron Tankless Water Heater – Tempra 24 Plus – Electric, On Demand Hot Water, Eco, White, 20.2
954 Reviews
Stiebel Eltron Tankless Water Heater – Tempra 24 Plus – Electric, On Demand Hot Water, Eco, White, 20.2
  • CONTINUOUS FLOW – Advanced Flow Control patented technology invented by Stiebel Eltron, automatically maintains water temperature for constant comfort. It’ll reduce flow slightly if hot water demand exceeds capacity. Hot showers will never be interrupted again
  • SPACE & ENERGY SAVER – Its small, sleek white design saves space yet still provides endless hot water for your whole house, and no venting is required. Eco friendly unit saves energy with auto-modulation and the ability to electronically control water flow. Savings monitor even shows how much you save on energy costs
  • EASY OPERATION – Electronic switch activates the hot water heater and it’s noise free while in use. Has a digital temperature display and preset temperature and memory buttons, while the interior solid copper heating system does all the power work
  • TEMPRA 24 PLUS – This specific model is 24kW, 240V, requires a min recommended electric service of 150 A, and offers an output water temperature of 68° to 140°F. Check our guides below to compare features of our various Trend and Plus models, each available in different kW levels
  • WARRANTIES INCLUDED – Stiebel Eltron’s top-rated electric tankless water heaters perform with the highest standards for comfort and reliability. Our 7-Year Leakage and 3-Year Parts Warranties are included with purchase
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EcoSmart 8 KW Electric Tankless Water Heater, 8 KW at 240 Volts with Patented Self Modulating Technology
  • The product is highly durable
  • The product is easy to use
  • Manufactured in China
  • Heating elements are durable and are threaded for easy replacement
  • Activation Flow - 0.3 GPM
Rheem RTEX-11 11kW 240V Electric Tankless Water Heater, Gray
63 Reviews
Rheem RTEX-11 11kW 240V Electric Tankless Water Heater, Gray
  • ON/OFF Dial Control with adjustable digital temperature display
  • Self-modulating power control
  • 11kW Model Flow Rate: up to 2.68 GPM
  • Side 1/2" NPT water connections
  • On demand, consistent and continuous hot water
Tankless Water Heater Electric 5.5kw 240V, ECOTOUCH Point-of-Use Hot Water Heater Digital Display,Electric Instant Hot Water Heater with Self-modulating,Overheating Protection,White
1,248 Reviews
Tankless Water Heater Electric 5.5kw 240V, ECOTOUCH Point-of-Use Hot Water Heater Digital Display,Electric Instant Hot Water Heater with Self-modulating,Overheating Protection,White
  • 【INSTANT & SUFFICIENT HOT WATER】Applied with 5.5KW heating system, the electric water heater supplies instant, consistent and endless hot water of 116℉or higher temp shortly, no waiting for preheat nor terrible temp up & down, perfect companion for sinks. Time to get rid of those "lukewarm" toys.
  • 【SMART SELF ADJUSTMENT】The hot water heater adjusts power input based on flow rate and temp setting in real time. For example, less power will be applied by the system when waterflow reduced, thus you still get ideal temperature instead of scalding hot water, which means comfortable experience. Optimal energy efficiency of 98% saves considerable electric charge.
  • 【CONVENIENT USE】The tankless water heater comes with digital display & touch control panel so temp setting is easy job. Now turn on the tap and let the smart unit do the rest, you needn’t go through hard lesson about temp setting by a mixer tap without any hint. The Black model comes with Remote control, useful for installation under sink.
  • 【SAFE and DURABLE】Applied with multiple protection devices, every piece goes through strict tests to ensure 100% safe. Inner water and electricity lines are designed to run separately so as to avoid leakage or harm of scale build up. Approval by ETL and qualifies for UL, you can expect outstanding performance for years to come.
  • 【POINT of USE】The sleek tankless water heater is compact as an oatmeal box, making it possible to install anywhere close to outlet and avoid energy waste. It can be mounted horizontally, vertically, obliquely, ideal for kitchen, bar, school, hospital, community and hair salon. Please verify it is the right size for you: [email protected]; dimensions 11" x 7.5" x 2.35"; pipes fittings :1/2" NPT.
Ecosmart ECO 24 24 KW at 240-Volt Electric Tankless Water Heater with Patented Self Modulating Technology, 17 x 17 x 3.5
197 Reviews
Ecosmart ECO 24 24 KW at 240-Volt Electric Tankless Water Heater with Patented Self Modulating Technology, 17 x 17 x 3.5
  • Lifetime warranty
  • Save up to 60-percent on your water heating cost with an ECOSMART electric tankless water heater
  • Never run out of hot water with an ECOSMART tankless water heater
  • Patented Self Modulating Technology and design.Activation flow 0.3 GPM
  • ECOSMART tankless water heaters are 99.8-percent energy efficient
Rheem 240V 4 Heating Chambers RTEX-36 Residential Tankless Water Heater, GRAY
56 Reviews
Rheem 240V 4 Heating Chambers RTEX-36 Residential Tankless Water Heater, GRAY
  • External digital thermostatic control with LED display (+/1 degree accuracy)
  • Most advanced self-modulation, adjust power to meet hot water demand
  • Durable Copper immersion four heating elements, field Serviceable
  • Simple installation – bottom 3/4 inch NPT water connections
  • Threaded for easy replacement, simple installation, digital temperature display.Amperage:150 amps.A max flow of 8.0 GPM
Eemax EEM24018 Electric Tankless Water Heater, Blue
137 Reviews
Eemax EEM24018 Electric Tankless Water Heater, Blue
  • Tankless water heaters provide a continuous Supply of hot water and only heats the water you need, when you need it
  • Instant, consistent and endless hot water
  • The most advanced, self-modulating technology available, meaning the unit will adjust how much energy needs to be input based on how much hot water is needed
  • Compact size saves valuable storage space; Resistant and stylish with digital temperature control in increments of 1°F ranging from 80°F to 140°F
  • Before purchase and installation, Please verify that this EEM24018 is the correct size for your hot water needs.Rated Pressure: 25psi minimum; 150psi maximum
Rinnai RL94IN RRL94iN, 9.8 GPM, Indoor Installation
176 Reviews
Rinnai RL94IN RRL94iN, 9.8 GPM, Indoor Installation
  • Energy and Space Efficient: Space-saving design conserves energy as it heats only when necessary
  • Optimal Water Pressure: High-performance 9.8 GPM hot water flow rate for a powerful, constant stream
  • Instant Heating: Circ-Logic technology enables recirculation patterns that coincide with your typical habits; Wi-Fi monitoring creates hot water on demand
  • Guaranteed to Last: 12-, 5-, and 1-year residential and 5-, 5-, and 1-year commercial factory warranty for heat exchanger, parts, and labor respectively
Tankless Water Heater, 110V 3000W Portable Mini Instant Electric Hot Water Heater System with LCD Digital Display for Household Indoor Bathroom Kitchen Washing
7 Reviews
Tankless Water Heater, 110V 3000W Portable Mini Instant Electric Hot Water Heater System with LCD Digital Display for Household Indoor Bathroom Kitchen Washing
  • 【Specification】: Dimensions: 7.87 x 4.13 x 2.55in; Power: 3000W; Rated Frequency: 60HZ; Rated pressure: 0.4-0.6mpa; Temperature: 30-55; Water pipe interface: G 1/2"" interface; Installation wire diameter: 1.5-2.5mm² copper wire. Please verify it's the right size for you before purchase
  • 【Provide Endless Hot Water】: Instant Electric Water Heater changes cold water into hot water, which can take advantage of the thermal energy maximally, so you can get steady stream of clean and fresh hot water for daily life
  • 【Premium Material】: This Tankless Water Heater adopts stainless steel material, which is durable, easily solves issues such as face washing, bathing, vegetable washing and dish washing; Freely adjust water temperature by water flow, simple operation
  • 【Wide Application】: Compact size and lightweight design, high practicity and convenient installation, install this tankless hot water heater under your sink to provide hot water right where you need it, widely used at kitchen, rest room, bathroom or any other places
  • 【Practical and Beautiful】: Lightweight mini electric water heater with LCD digital temperature display, a perfect combination of inner quality and classical appearance, adds an exquisite and practical furniture for your home
Camplux Tankless Water Heater Electric with LED Display 120V Instant Water Heaters Under Sink 3.5kw TE04
236 Reviews
Camplux Tankless Water Heater Electric with LED Display 120V Instant Water Heaters Under Sink 3.5kw TE04
  • Smart&Considered Design: Small water heater designed with smart touch control & LED display, mini size, perfect for under sink installation. The minimum water flow for activation just need 0.4 GPM (Only for one sink)
  • Multi-angled Mounting: The compact size instant electric water heater requires a connection of 1* 40A circuit breaker & 10 AWG wire. Install close to outlet for energy saving. Can be mounted Multi-angled, ideal for kitchen, wet bars, school, hospital, hair salon and boats. Please make sure it is the right size for you: 3.5kW at 120V, product dimensions 7.8" x 6.3" x 3.9", water pipes fitting: 1/2" NPT male
  • Reliable&Durble: The 3.5kW tankless water heater comes with 5 protections. NFS approved, offer lead-free water. ETL safety certified, leakage and overheat protection device to ensure your safety. Stainless steel and copper component for high efficiency and durability
  • Consistent Hot Water -On demand water heater only heats the water when you need it and no waiting for preheat.The temperature rise of 1.0 GPM is 55°F. Easy to get hot water between 85°F - 131°F in seconds. Enjoy instant and endless hot water
  • Rotatable LED Display: 120V tankless water heater features an upgrade rotatable digital temperature display and touch control panel, show you the easy reading output water temperature at real-time and setting ideal temperature just by finger. Note: This mini water heater is only suitable for sink use, not for bathing
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Ecosmart POU 3.5 Point of Use Electric Tankless Water Heater, 3.5KW@120-Volt, 7” x 11” x 3”
675 Reviews
Ecosmart POU 3.5 Point of Use Electric Tankless Water Heater, [email protected], 7” x 11” x 3”
  • Can provide hot water for one sink at 0.5 GPM in warmer climates
  • Requires 1 x 30 amp breaker and 10 AWG wire
  • For one sink at 0.5 GPM in colder climates the POU 6 is recommended
  • Amperage Draw 29 amp. kW - 3.5 kW
  • Connection Fittings 1/2" NPT
Tankless Water Heater Electric 27kW 240 Volt, thermomate On Demand Instant Endless Hot Water Heater, Digital Temperature Display for Residential Whole House Shower, 114A GRAY
  • [Instant Unlimited Hot Water] - REQUIRE 3 SET x Double-pole 40AMP Breakers to Achieve 240V for this On demand tankless electric water heater, providing hot water in 3 seconds when you need it and as long as you need, eliminating wait time, never run out of hot water again and No More cold shower. Flow Rate 5.27GPM @35°F Rise
  • [Save Money and Space] - Intelligent self-modulating technology regulating the amount of energy required to heat water only when you need it with 99.8% efficient, saving up to 60% on water heating cost comparing to traditional tank water heater. Wall mounted compact size with no water tank, convenient for any spaces, saving floor space and fitting into tight spaces.
  • [Stable Water Temperature] - Auto adjusting energy consumption basing on income water temperature and flow, ensuring maximum efficiency, continuous stable temperature and optimal power usage. Digital temperature display allowing adjustment in 1° increment from 80°F to 140°F. Heating element separated from water tube significantly reducing scale, corrosion and mineral buildup on the element, achieving better performance and low maintenance.
  • [Easy Installation & Safety Protection] - ETL certified with overheating protection, auto stop heating when detecting no water, quality workmanship for leakage protection
  • NOTE - Make sure this water heater is the correct size for your hot water need: 27kW at 240V draw max 114Amp; Required breaker 3 x Double-POLE 40AMP; Wire gauge 3 x 8AWG; Unit size 17.12" x 13.12" x 3.12"; Water connection 3/4" NPT. 2-year limite warranty and 24/7 customer support services.
Eemax SP3512 Electric Tankless Water Heater, 120V 3.5 kW, Only for 0.5 GPM sinks
107 Reviews
Eemax SP3512 Electric Tankless Water Heater, 120V 3.5 kW, Only for 0.5 GPM sinks
  • Ease of installation - No T and P valve needed - Only bring one cold water line to lavatory
  • Connections: 3/8-Inch compression fittings at top of unit
  • Voltage: 120V, Power: 3. 5kW
  • Temperature rise at . 5GPM = 48 Degree Fahrenheit, Turn on: 0. 5. Dimensions: 10. 75-Inch W x 5. 25-Inch H x 3-Inch D
  • Amperage: 29
Rheem RTEX-08 8kW 240V Tankless Electric Water Heater, Gray
  • ON/OFF Dial Control with adjustable digital temperature display
  • Self-modulating power control
  • 8kW Model Flow Rate: up to 1.95 GPM
  • Side 1/2" NPT water connections
  • On demand; continous hot water

Electric Tankless Water Heater Systems Advantages and Disadvantages

An electric tankless water heater has a thermostatically controlled heating element that varies the flow rate of water to match the temperature requirement of users. When the flow rate is set to high, it provides hot water when you want it. And when the flow rate is set too low, it saves energy because it only heats water when the temperature is appropriate.

There are several types of electric tankless water heaters available in the market today. There are single-stage units and multi-stage units. The single-stage units are usually installed in bathrooms, since they are smaller than the multi-stage ones. But you can get the same kind of results from multi-stage units even if they are bigger in size. Single-stage units also produce less moisture, so they are ideal for places where condensation is a problem like shower rooms.

One of the biggest advantages of using an electric tankless water heater is its energy savings. Aside from paying less for energy, you can also reduce your carbon footprint. Since the water is heated on demand and only used when you’re thirsty, it results to cheaper electric bills. You can also add up to 15% more energy savings through the year if you regularly use your tankless unit as hot water source.

This kind of tankless heater saves money because it produces less heat. The electric unit runs continuously when needed. This results to lesser energy consumption. This translates to lower electricity bills and savings. In fact, some homeowners have reported saving up to 80% more from their electric tankless water heaters compared to conventional units.

Compared to the conventional type of tankless heaters, electric tankless water heaters do not cause much noise. They are very space saving because they take up very little space inside the bathroom. They do not have to be vented and they are ideal for apartments and homes with limited spaces. The gas tankless water heaters are a bit loud but it is quite manageable when installed in the right spot.

The good thing about these electric tankless water heaters is that they are very safe and reliable. Most of them are produced with modern safety devices like overload and short-circuit warning. If there is a power outage or a gas leak, an automatic shut-off system will automatically shut down the unit. You do not need to worry because most manufacturers give enough time for the problem to be resolved before the unit will need to be repaired.

The gas-fired hot water heaters also have their benefits. You can save money and energy, you do not need a gas line installed, and it is also very safe to use. However, gas-fired heater is not advisable for homeowners with a gas line in their homes because this kind of heater requires constant maintenance. A gas water heater needs to be refueled with natural gas whenever it gets low on supply.

The good thing about the 120-volt electric tankless water heaters is that they require less space. They could be installed on almost any flat surface including your deck and outdoor locations. You can also install a gas-fired heater near a shower, your garden, your patio, or beside a pool. This means that you will not have to pay more for a gas connection.

Another advantage is that you can install an electric tankless water heaters without the need for a professional installation technician. The only thing you need to do is to add an electric outlet. Although installing a gas-fired unit will require you to hire a professional technician, you still do not need to do so because you can simply install the heater yourself. Since this unit is less complicated, it will be easier for you to install and you can do it yourself rather than calling a contractor to do it for you.

The natural gas tankless water heaters usually consume three to four times more energy than the electric ones. As a result, they usually cost more. In contrast with the two different types of natural gas units, this unit consumes only one-third of the amount that natural gas units consume. This means that you will be able to save up to 70% of your energy consumption by using an electric tankless water heater. If you are concerned about your electricity consumption, you could always choose natural gas instead of natural gas since this unit only consumes half as much.