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Top 10 Best on demand electric water heater Reviews

Top 10 Rated on demand electric water heater in 2021 Comparison Table

SaleBestseller No. 1
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
SaleBestseller No. 2
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
SaleBestseller No. 3
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
Bestseller No. 4
Eccotemp i12-LP Water Heater, 4 GPM, Black
  • Whole home indoor, gas powered tankless water heater, rated at 4 GPM that activates only on demand and no pilot light needed, reducing energy consumption
  • Sleek, modern design with black tempered glass front panel featuring an easy to use LED display controls
  • Features fully automatic temperature controls with an energy saving mode and child lock technology
  • Safe electronic ignition system; Plugs into standard 110v electrical outlet with UL-listed cord
  • Uses standard 1/2" NPT water fittings and comes with horizontal venting allowing for a convenient and quick installation
Bestseller No. 5
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
Bestseller No. 6
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
SaleBestseller No. 7
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
Bestseller No. 8
Rheem 240V 3 Heating Chambers RTEX-27 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 three heating elements, field Serviceable
  • Simple installation – bottom 3/4 inch NPT water connections
  • Threaded for easy replacement, simple installation, digital temperature display
SaleBestseller No. 9
Tankless Water Heater Electric 18kW 240 Volt, thermomate On Demand Instant Endless Hot Water Heater, Digital Temperature Display Easy Installation, for Residential Whole House Shower, 76A GRAY
  • [Instant Unlimited Hot Water] - REQUIRE 2 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
  • 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.
  • Smart Operation - 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: 18kW at 240V draw max 76amp; Required breaker 2 x Double-POLE 40AMP; Wire gauge 2 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.
Bestseller No. 10
Bosch Electric Mini-Tank Water Heater Tronic 3000 T 2.5-Gallon (ES2.5) - Eliminate Time for Hot Water - Shelf, Wall or Floor Mounted
  • CONVENIENT HOT WATER HEATER: 2.5 gallon point-of-use mini-tank fits under your sink to provide hot water right where you need it. Thermal efficiency is 98%. Dimensions : 13.75 W x 13.75 H x 10.75 D Inches
  • LONG LASTING QUALITY: This electric water heater is easy to maintain and has premium glass-lined material for a long service life. (Amps 12A, Volts (VAC) 120)
  • INDEPENDENT INSTALLATION: 36-37" cord plugs into a 120 volt outlet for independent installation or in-line with a large hot water source
  • FAST RECOVERY RATE: Eliminates long waits for hot water at your sink, get on demand hot water at your every need (supplies up to 2 sinks at a time)
  • EASILY MOUNTED: Can be shelf, wall or floor mounted (bracket included); simply tap into the cold water line and install the water heater directly at the sink to provide hot water
Are you searching for top 10 good on demand electric water heater for your money in 2021? After evaluating and analyzing in detail more than 73,993 customer satisfaction about top 10 best on demand electric water heater in 2021, we have come up with the top 10 rated products you may be interested in. We have ranked the best brands from Artificial Intelligent and Big Data, as you see below:

Our Best Choice: Tankless Water Heater Electric 18kW 240 Volt, thermomate On Demand Instant Endless Hot Water Heater, Digital Temperature Display Easy Installation, for Residential Whole House Shower, 76A GRAY


Our rating:4.7 out of 5 stars (4.7 / 5)





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Product Description

18kW tankless electric water heater18kW tankless electric water heater

tankless water heatertankless water heater

thermomatethermomate

Live Smart, Better Life!

thermomate delivers a comprehensive product line of water heater, including i.e. mini tank electric water heater, tankless electric water and gas water heater. Our mission is to produce and distribute quality green energy products that are efficient and economical for consumers. We are very passionate about helping the beautiful world we live in, and we always ensure that our products can enjoyed by all.

Kitchen

Bathroom

Garage & Basement

Office & Bar

thermomate Tankless Electric Water

Live Smart, Better Life

Whether shower and baths, laundry and dishes, or shaving and hand washing, for home or business, with dedicated advanced technology and years of experiences in hot water solution, thermomate’s new line of tankless electric water heaters provide you a hot water system you can count on, every day, for years to come.

Energy efficient, easy installation, compact size, endless hot water, consistent water flow, perfet for point of use, booster, or whole house needs

Dimensions: 17.12″ x 13.12″ x 3.12″

Weight: 19 lbs

Nominal Current: 2x38A

Nominal Pressure: 150PSI

Water Connections :3/4” NPT

Required Wire: 2 x 8 AWG

Required Breakers:2 x Double-POLE 40AMP

Note: Breakers and wire are not included

On Demand Hot Water System You Can Count On

face washingface washing

dish washingdish washing

laundrylaundry

Consistent Endless Hot Water in 3s

Choose our ET series tankless water heater, NO need to wait for water getting ready for a shower, NO sudden cold water during your shower. Our stable flow technology provide you immediate unlimited continuous hot water for as long as you need and anytime you want. You can adjust the temperature in 1° increment from 80°F to 140°F. Thermomate tankless unit auto adjust power to ensure constant temperature output.

Energy efficient

Save as much as 60% on your electric bill compared to the traditional tank water heater. Electric tankless unit only heat water that you use, eliminating standby heat loss with the tank type heater. Also with auto modulating technology and 99.8% heating efficiency, thermomate ET tankless water heater can monitor water flow and temperature, and use only necessary power to heat water as efficiently as possible.

Save Space

Traditional whole house tank water heater is so bulky that it can only be placed in your garage or basement, which is far from your main water use point. Our lightweight and easy-to-install electric tankless water heaters can be mounted in small or tight spaces throughout your home with no need of venting to operate

instant hot waterinstant hot water

User Friendly and Maintenance Free Design

Digital temperature display easy to adjust it by a single degree from 80°F to 140°F using the knob. Easy to install. Auto stop heating when there’s no water.

Heating element is separated from water tube, significantly reducing scale, corrosion and mineral buildup, ensuring unit working stable for a long service life.

Choose Your Thermomate ET Eelectric Tankless Water Heater

sizing chartsizing chart

kW

11

18

27

Voltage

240V

240V

240V

Temp. Range

80°F – 140°F

80°F – 140°F

80°F – 140°F

Max Amperage

46A

76A

114A

Required Breaker

2 x Double-POLE 30 AMP

2 x Double-POLE 40 AMP

3 x Double-POLE 40 AMP

Wire Gauge

2 x 12 AWG

2 x 8 AWG

3 x 8 AWG

Size

14.75″ x 11.75″ x 3.12″

17.12″ x 13.12″ x 3.12″

17.12″ x 13.12″ x 3.12″

Weight

12.10 lb

19.10 lb

20.30

Water Connections

1/2″ NPT

3/4″ NPT

3/4″ NPT

[Instant Unlimited Hot Water] – REQUIRE 2 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
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.
Smart Operation – 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: 18kW at 240V draw max 76amp; Required breaker 2 x Double-POLE 40AMP; Wire gauge 2 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.

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