Updated:March, 2026

10 Best Electric Tankless Water Heater 240v of 2026

Best Choice

9.9

Outstanding

thermomate

ThermoMate Tankless Water Heater Electric for Sink Faucet, 6000W 240V Point of Use Instant Hot Water Heater CSA Certified with Self-modulating, Overheating Protection, 1.07GPM at 35°F Rise

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Why We Love It

[Instant Faucet Hot Water] - 6kw power heating system provides 1.0GPM at 50°F Temp Rise on demand hot water in seconds for point-of-use applications, perfect for under / over sink placement. Temperature range from 85°F - 131°F. 24 Hours standby. Draw 25Amp @ 240V
[Self-modulating Power] - 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.
Long-lasting Quality - Cast aluminum heating element uniquely desgined to separated from water while heating, significantly reducing scale, corrosion and mineral buildup, achieving long-life service with low maintenance. SUS 304 stainless steel water tube
Sleek Compact Size - 10.95" x 7.4" x 2.52", Small water heater conveniently designed to fit in tight places within your home or business, like under cabinets and sinks, hair salons, bar counters and hotel receptions, saving valuable storage space
User Friendly - Touch control panel and digital temperature display allowing adjustment in 1° increment. IP25 waterproof, Standard 1/2"NPT pipe fitting, pre-wired pigtail for easy installation. 6kW 240V ONLY Hardwired, requiring 30A Circuit Breaker, 12AWG min wire size and 1/2"NPT water connections

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Why We Love It

[Instant Faucet Hot Water] - 6kw power heating system provides 1.0GPM at 50°F Temp Rise on demand hot water in seconds for point-of-use applications, perfect for under / over sink placement. Temperature range from 85°F - 131°F. 24 Hours standby. Draw 25Amp @ 240V
[Self-modulating Power] - 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.
Long-lasting Quality - Cast aluminum heating element uniquely desgined to separated from water while heating, significantly reducing scale, corrosion and mineral buildup, achieving long-life service with low maintenance. SUS 304 stainless steel water tube
Sleek Compact Size - 10.95" x 7.4" x 2.52", Small water heater conveniently designed to fit in tight places within your home or business, like under cabinets and sinks, hair salons, bar counters and hotel receptions, saving valuable storage space
User Friendly - Touch control panel and digital temperature display allowing adjustment in 1° increment. IP25 waterproof, Standard 1/2"NPT pipe fitting, pre-wired pigtail for easy installation. 6kW 240V ONLY Hardwired, requiring 30A Circuit Breaker, 12AWG min wire size and 1/2"NPT water connections

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9.5

Excellent

Ranein

Ranein Electric Tankless Water Heater, 18kW 240V on Demand Instant Endless Water Heater with LED Temperature Display for Residential Whole House Shower, Space Saving

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Main Highlights

Note: Make sure this water heater tankless is sized for your hot water needs: 18 kW; 240 volts; circuit breaker required 2 x bipolar 40 amps; unit dimensions 13.8" x 3.1" x 18.7"; water connection 3/4" NPT.
Save: Compared to tank-type water heaters, electric tankless water heater don't require preheating. There's no energy consumption when not in use. It saves 60% of heating costs. Additionally, it's more compact and can be installed anywhere.
Powerful: This electric water heater's on-demand thermal efficiency reaches up to 99%. With a flow rate of up to 4.3GPM, it's suitable for 2-3 usage points throughout the house. No waiting for preheating. Provides endless ample hot water.
Simple: The endless hot water heater electric features knob controls and an LED display. With an adjustment range from 86°F to 131°F in 1°F increments, just simply set the temperature and enjoy stable and ample hot water.
Safe: The instant electric tankless water heater is applied with multiple protections, like leakage protection, overheating protection, and drop test, damp proof, every unit electric tankless water heater goes through strict tests to ensure 100% safety and it is listed by CSA.

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Main Highlights

Note: Make sure this water heater tankless is sized for your hot water needs: 18 kW; 240 volts; circuit breaker required 2 x bipolar 40 amps; unit dimensions 13.8" x 3.1" x 18.7"; water connection 3/4" NPT.
Save: Compared to tank-type water heaters, electric tankless water heater don't require preheating. There's no energy consumption when not in use. It saves 60% of heating costs. Additionally, it's more compact and can be installed anywhere.
Powerful: This electric water heater's on-demand thermal efficiency reaches up to 99%. With a flow rate of up to 4.3GPM, it's suitable for 2-3 usage points throughout the house. No waiting for preheating. Provides endless ample hot water.
Simple: The endless hot water heater electric features knob controls and an LED display. With an adjustment range from 86°F to 131°F in 1°F increments, just simply set the temperature and enjoy stable and ample hot water.
Safe: The instant electric tankless water heater is applied with multiple protections, like leakage protection, overheating protection, and drop test, damp proof, every unit electric tankless water heater goes through strict tests to ensure 100% safety and it is listed by CSA.

9.5

Excellent

NCPYZO

Tankless Water Heater Electric 240V-7000W. Instant Water Heater for Kitchen、Bathroom、Under Sink.On Demand Hot Water Heaters Electric with Digital Display.Continuous Flow Point of Use On Demand Heating

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Main Highlights

Electric Water Heater on Demand - This 220-240 volt water heater is equipped with state-of-the-art technology, with 7000W power, LED display. The instant water heater electric NCPYZO supplies instant, sufficient and endless hot water of 131 or higher temp in seconds.no waiting for preheating nor terrible temp fluctuation.this electric water heater is very simple,Small sizelightweight, and easy to install perfect companion for sink faucet.
Smart Self Modulation - Electric water heater adopts frequency conversion function, which automatically adjusts the power input according to the flow and temperature settings. When the water flow is reduced, the system will consume the least electricity, effectively reducing energy waste, no preheating is required to avoid heat loss during long-term preheating. Save both energy and time.
Safe and Reliable - The instant hot water heater has a memory function or an automatic alarm function when the power supply position and failure occur. IPX4 waterproof, leakage protection, dry-burning protection, automatic power-off in over-temperature and inactive states. Setting withstand 480V insulation protection. Intelligent memory function, avoid repeated operation. Setting inside or outside electric leakage proof valve", double protection to makesecure.
Easy to Install and Application - This instant electric water heater comes with premade fixing screw holes, an English manual,Fixed bracket and 1/2 inch NPT standard interface. This small electric water heater is ideal for spaces such as kitchens, apartments, bathrooms, shower, and under sink.The comfortable water temperature generated by this 240V water heater is suitable for cleaning food, bowls, clothes, face, hands, etc.
Quality Warranty & Important Note - We provide a long term warranty for the electric water heater tankless.If you encounter any after-sales issues regarding the small hot water heater,you can always contact our electric tankless water heaters support team. Tip: Make sure it's the right size for you: 7KW at 220-240V,product measures 12.1"H x 3.1"D x 8.1"W inches.This electric hot water heater is recommended to be connected with wires with a cross-sectional area of 2.5 square millimeters,and connected to trip switches of over 32a for use.

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Main Highlights

Electric Water Heater on Demand - This 220-240 volt water heater is equipped with state-of-the-art technology, with 7000W power, LED display. The instant water heater electric NCPYZO supplies instant, sufficient and endless hot water of 131 or higher temp in seconds.no waiting for preheating nor terrible temp fluctuation.this electric water heater is very simple,Small sizelightweight, and easy to install perfect companion for sink faucet.
Smart Self Modulation - Electric water heater adopts frequency conversion function, which automatically adjusts the power input according to the flow and temperature settings. When the water flow is reduced, the system will consume the least electricity, effectively reducing energy waste, no preheating is required to avoid heat loss during long-term preheating. Save both energy and time.
Safe and Reliable - The instant hot water heater has a memory function or an automatic alarm function when the power supply position and failure occur. IPX4 waterproof, leakage protection, dry-burning protection, automatic power-off in over-temperature and inactive states. Setting withstand 480V insulation protection. Intelligent memory function, avoid repeated operation. Setting inside or outside electric leakage proof valve", double protection to makesecure.
Easy to Install and Application - This instant electric water heater comes with premade fixing screw holes, an English manual,Fixed bracket and 1/2 inch NPT standard interface. This small electric water heater is ideal for spaces such as kitchens, apartments, bathrooms, shower, and under sink.The comfortable water temperature generated by this 240V water heater is suitable for cleaning food, bowls, clothes, face, hands, etc.
Quality Warranty & Important Note - We provide a long term warranty for the electric water heater tankless.If you encounter any after-sales issues regarding the small hot water heater,you can always contact our electric tankless water heaters support team. Tip: Make sure it's the right size for you: 7KW at 220-240V,product measures 12.1"H x 3.1"D x 8.1"W inches.This electric hot water heater is recommended to be connected with wires with a cross-sectional area of 2.5 square millimeters,and connected to trip switches of over 32a for use.

9.2

Excellent

thermomate

Tankless Water Heater Electric, thermomate 14kW at 240 Volt, On Demand Instant Hot Water Heater for Shower, Self-Modulating Save Energy, Save Space, 2.66GPM at 35°F Rise ET140

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Main Highlights

[On Demand Endless Hot Water] - Provide continuous endless hot water for residential house use. 24 hours standby. 14kW powerful heating support up to 2 faucets & 1 shower and large 2.66GPM at 35°F temperature rise. electronic temperature control adjustable in 1-degree increments from 86 to 131°F. Requires Double Pole 60Amp breaker
[Leak Proof & Maintenance Free] - The first to use cast aluminum heating chamber, Heating element separated from water lines to prevent water leaking and scale & corrosion on heating element, ensuring high heating efficiency and extending usage life span
[Save Money and Space] - Self-modulating technology auto regulating the amount of energy required to heat water by continuously detecting water temperature and flow rate with 99% heating efficiency, saving up to 60% on water heating cost comparing to traditional tank water heater. 1/2"NPT connections and wall mounted compact size with no water tank, convenient for any spaces, saving floor space and fitting into tight spaces
[Easy Installation & Safety Protection] - ETL Listed to UL-499 and CAN/CSA-C22.2 No. 64 with overheating protection, auto stop heating when detecting no water, quality workmanship for leakage protection
[Installation] - 14 kilowatts at 240V draws max 58amp, 1/2 NPT male ports, 6AWG wire to 60AMP Double-pole breaker, ideal for providing hot water for a bathroom, small sink, office break room and other point-of-use or low-flow applications

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Main Highlights

[On Demand Endless Hot Water] - Provide continuous endless hot water for residential house use. 24 hours standby. 14kW powerful heating support up to 2 faucets & 1 shower and large 2.66GPM at 35°F temperature rise. electronic temperature control adjustable in 1-degree increments from 86 to 131°F. Requires Double Pole 60Amp breaker
[Leak Proof & Maintenance Free] - The first to use cast aluminum heating chamber, Heating element separated from water lines to prevent water leaking and scale & corrosion on heating element, ensuring high heating efficiency and extending usage life span
[Save Money and Space] - Self-modulating technology auto regulating the amount of energy required to heat water by continuously detecting water temperature and flow rate with 99% heating efficiency, saving up to 60% on water heating cost comparing to traditional tank water heater. 1/2"NPT connections and wall mounted compact size with no water tank, convenient for any spaces, saving floor space and fitting into tight spaces
[Easy Installation & Safety Protection] - ETL Listed to UL-499 and CAN/CSA-C22.2 No. 64 with overheating protection, auto stop heating when detecting no water, quality workmanship for leakage protection
[Installation] - 14 kilowatts at 240V draws max 58amp, 1/2 NPT male ports, 6AWG wire to 60AMP Double-pole breaker, ideal for providing hot water for a bathroom, small sink, office break room and other point-of-use or low-flow applications

9.0

Excellent

thermomate

Tankless Water Heater Electric 27kW 208~240 Volt, ThermoMate On Demand Instant Endless Hot Water Heater, Digital Temperature Display for Residential Whole House Shower, 114A Gray

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Main Highlights

[Instant Unlimited Hot Water] - 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. Requires 120Amp breaker (3 Sets of Double-pole 40AMP Breakers)
[Self-modulating Power] - 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 208 ~ 240V (adjustable) 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

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Main Highlights

[Instant Unlimited Hot Water] - 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. Requires 120Amp breaker (3 Sets of Double-pole 40AMP Breakers)
[Self-modulating Power] - 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 208 ~ 240V (adjustable) 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

8.8

Very Good

thermomate

ThermoMate Electric Tankless Water Heater, 11kW at 240 Volt, On Demand Instant Hot Water Heater, Self Modulating Energy Saving, Save Space, 2.15GPM at 35°F Rise, Side Connections

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Main Highlights

[Instant Endless Hot Water] - Provide consistent hot water wherever and whenever you need it. 24 hours standby. 11kW powerful heating support up to 3 faucets and large 2.15GPM at 35°F temperature rise. Max temperture up to 131°F. Requires Double Pole 50Amp breaker
[Leak Proof & Maintenance Free] - The first to use cast aluminum heating chamber, Heating element separated from water lines to prevent water leaking and scale & corrosion on heating element, ensuring high heating efficiency and extending usage life span
[Save Money and Space] - Self-modulating technology auto regulating the amount of energy required to heat water by continuously detecting water temperature and flow rate with 99% heating efficiency, saving up to 60% on water heating cost comparing to traditional tank water heater. Side water connection and wall mounted compact size with no water tank, convenient for any spaces, saving floor space and fitting into tight spaces
[Safety Protection] - ETL certified with overheating protection, auto stop heating when detecting no water, quality workmanship for leakage protection
[Installation] - 11 kilowatts at 240V draws max 46amp, 1/2 NPT male ports, 6AWG wire to 50AMP Double-pole breaker, ideal for providing hot water for a bathroom, small sink, office break room and other point-of-use or low-flow applications

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Main Highlights

[Instant Endless Hot Water] - Provide consistent hot water wherever and whenever you need it. 24 hours standby. 11kW powerful heating support up to 3 faucets and large 2.15GPM at 35°F temperature rise. Max temperture up to 131°F. Requires Double Pole 50Amp breaker
[Leak Proof & Maintenance Free] - The first to use cast aluminum heating chamber, Heating element separated from water lines to prevent water leaking and scale & corrosion on heating element, ensuring high heating efficiency and extending usage life span
[Save Money and Space] - Self-modulating technology auto regulating the amount of energy required to heat water by continuously detecting water temperature and flow rate with 99% heating efficiency, saving up to 60% on water heating cost comparing to traditional tank water heater. Side water connection and wall mounted compact size with no water tank, convenient for any spaces, saving floor space and fitting into tight spaces
[Safety Protection] - ETL certified with overheating protection, auto stop heating when detecting no water, quality workmanship for leakage protection
[Installation] - 11 kilowatts at 240V draws max 46amp, 1/2 NPT male ports, 6AWG wire to 50AMP Double-pole breaker, ideal for providing hot water for a bathroom, small sink, office break room and other point-of-use or low-flow applications

8.6

Very Good

Rheem

Rheem 11kW 240V Tankless Electric Water Heater

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Main Highlights

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

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Main Highlights

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

8.3

Very Good

Rheem

Rheem 6kW 240V Point of Use Thermostatic Tankless Electric Water Heater

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Main Highlights

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 - Rheem Professional POU T tankless electric water heaters are 90% smaller than traditional tank heaters, great for point-of-use installation
Save Energy - only heats water when in use

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Main Highlights

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 - Rheem Professional POU T tankless electric water heaters are 90% smaller than traditional tank heaters, great for point-of-use installation
Save Energy - only heats water when in use

8.1

Very Good

Rheem

Rheem RTEX-27 240V 3 Heating Chambers Residential Tankless Water Heater

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Main Highlights

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

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Main Highlights

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

8.1

Very Good

Rheem

Rheem 240V 2 Heating Chambers RTEX-18 Residential Tankless Water Heater, Small Grey

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Main Highlights

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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Main Highlights

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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