Best 240V Tankless Water Heaters in 2026: 15 Picks Ranked by Specs
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Choosing the best 240V tankless water heaters requires comparing published specifications, not opinions. We evaluated 15 models to find units that match your electrical and flow needs. The Rheem 18kW 240V Electric Tankless Water Heater leads this list because its 18 kW wattage delivers steady output for moderate whole-house demand. Each pick is ranked strictly by data like voltage, flow rate, and physical dimensions. This guide helps you decide which heater fits your home's capacity and installation space.
Quick picks
The best fit for you
- You need the best overall whole-house model Rheem 18kW 240V Electric Tankless Water Heater Its 18 kW output delivers up to 4.4 GPM for steady whole-house performance.
- You want the most compact point-of-use unit Camplux 6000W 240V Point-of-Use Tankless Water Heater It measures only 7 by 10 by 7 inches for tight under-sink spaces.
- You need high-output heating for heavy demands WINTEMP 36kW Electric Tankless Water Heater Its 36 kW rating and self-modulating system handle high multi-bathroom flow.
Our 15 picks
Rheem 18kW 240V Electric Tankless Water Heater
Best for: moderate-demand whole-house 240V water heating
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Flow Rate
- 4.4 GPM
- Wattage
- 18 kW
- Temperature Control
- ±1°F
- Dimensions
- 3.5 x 14.5 x 18.5 inches
View on Amazon: Rheem 18kW 240V Electric Tankless Water Heater
This 240V electric tankless water heater delivers up to 4.4 GPM using an 18 kW heating system. It features two field-serviceable copper immersion elements and self-modulating power control. You adjust temperatures via an external digital display with 1-degree precision. With standard 3/4-inch NPT bottom water connections and a compact 14.8-pound frame, it suits your whole-house needs if your peak hot water demand stays within its 4.4 GPM limit.
Pros
- Provides flow rates up to 4.4 GPM
- Self-modulating 18 kW power operation
- Digital temperature control accurate to 1 degree
- Two field-serviceable copper immersion heating elements
- Standard 3/4-inch NPT bottom water connections
Cons
- Maximum flow rate tops out at 4.4 GPM
- No wireless or mobile control features listed
Good fit if
- You require whole-house water heating with flow demands up to 4.4 GPM.
- You want digital thermostatic temperature adjustments with single-degree precision.
- You have a 240V electrical connection ready for an 18 kW load.
Skip if
- You need a flow rate exceeding 4.4 GPM for concurrent high-draw fixtures.
- You want built-in Wi-Fi monitoring or remote operation.
Verdict: Rheem 18kW 240V Electric Tankless Water Heater delivers steady whole-house output with up to 4.4 GPM and precise single-degree temperature control. Its self-modulating dual copper elements provide reliable performance for homes operating within that flow threshold.
Camplux 6000W 240V Point-of-Use Tankless Water Heater
Best for: single-sink point-of-use hot water
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Flow Rate
- 1.07 GPM at 35°F rise
- Wattage
- 6000 W
- Certification
- ETL Listed
- Dimensions
- 10.95 x 7.4 x 2.52 inches
View on Amazon: Camplux 6000W 240V Point-of-Use Tankless Water Heater
The Camplux 6000W is a compact electric tankless water heater designed for point-of-use installations. Running on 240V with a 6000W draw, it supplies 1.07 GPM at a 35°F temperature rise. Measuring 10.95 by 7.4 by 2.52 inches, it mounts directly under a counter. This unit suits you if you need dedicated hot water for a single sink without large equipment.
Pros
- Delivers 1.07 GPM at a 35°F temperature rise
- Compact footprint measuring 10.95 x 7.4 x 2.52 inches
- Digital LCD screen with touch temperature controls
- Self-modulating power based on water demand
Cons
- Output limited to 6000W, restricting use to single fixtures
- Flow rate tops out at 1.07 GPM at a modest 35°F rise
Good fit if
- You need dedicated hot water for a single bathroom or kitchen sink.
- You have tight clearance under a cabinet or counter.
Skip if
- You need to supply showers or whole-home fixtures.
- You require high flow rates in cold groundwater climates.
Verdict: Camplux 6000W 240V Point-of-Use Tankless Water Heater delivers focused low-flow heating for dedicated sink installations. Its small dimensions make it practical for tight under-sink spaces.
VEVOR 30-Gallon 5000W Electric Water Heater
Best for: small commercial setups needing stored 240V capacity
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Wattage
- 5000 W
- Capacity
- 30 gal
- Dimensions
- 40.2 x 17.7 x 17.7 inches
- Use
- Commercial
This VEVOR unit is a 240-volt electric water heater delivering 5000 watts of heating power alongside a 30-gallon storage tank. Unlike tankless models, it keeps water ready using 20 mm foam insulation and a corrosion-resistant enamel interior. Designed for small commercial spaces or households of three to five people, it supplies hot water to three or four outlets simultaneously, giving you steady pressure across multiple fixtures.
Pros
- 30-gallon storage tank supplies three to four outlets simultaneously
- 5000W heating element operates on 240V power
- 20 mm thick foam insulation retains stored heat
- IPX4 waterproof rating with built-in dry heating and overpressure protections
Cons
- Large 40.2 x 17.7 x 17.7-inch footprint weighing 74.5 pounds
- Storage tank design does not provide continuous on-demand heating
Good fit if
- You need a 240V commercial water heater serving three to four outlets at once.
- You prefer a 30-gallon stored reserve over instant on-demand heating.
Skip if
- You need a true tankless unit for unlimited continuous hot water.
- You do not have space for a 40.2-inch tall, 74.5-pound tank.
Verdict: VEVOR 30-Gallon 5000W Electric Water Heater delivers 5000W heating and 30 gallons of insulated capacity for 240V commercial installations. It reliably supplies multiple fixtures, though its storage tank dimensions require substantial installation space.
Thermomate 18kW Electric Tankless Water Heater
Best for: moderate household demands needing up to 4.4 GPM
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Flow Rate
- Up to 4.4 GPM
- Wattage
- 18kW
- Temperature Control
- 80°F to 140°F, 1° increment
- Certification
- ETL
View on Amazon: Thermomate 18kW Electric Tankless Water Heater
The Thermomate 18kW electric tankless water heater runs on 208V to 240V power and delivers flow rates up to 4.4 GPM. It relies on self-modulating technology and features a digital display with temperature adjustments from 80°F to 140°F in 1° increments. This unit fits your setup if you have space on your electrical panel for two 40-amp double-pole breakers and need steady, on-demand hot water for moderate household demands.
Pros
- Delivers flow rates up to 4.4 GPM
- Digital temperature control from 80°F to 140°F in 1° increments
- Heating element is separated from the water tube to reduce mineral scale
- Self-modulating design adjusts power based on incoming flow and temperature
Cons
- Demands dual double-pole 40A breakers and two 8 AWG wire lines
- Maximum water temperature is capped at 140°F
- Specified strictly for indoor installation
Good fit if
- You have panel capacity for two 40-amp double-pole breakers and two 8 AWG wire runs.
- You need up to 4.4 GPM of continuous hot water for moderate home fixtures.
- You want precise temperature control in single-degree increments.
Skip if
- You require water flow rates exceeding 4.4 GPM for simultaneous high-volume fixtures.
- You cannot dedicate an 80-amp electrical capacity to a water heater.
Verdict: Thermomate 18kW 240V Tankless Water Heater provides steady output up to 4.4 GPM with precise single-degree temperature adjustments. It serves as a dependable mid-capacity electric option if your panel supports dual 40-amp breakers.
ThermoMate 14kW Electric Tankless Water Heater
Best for: Small homes running one or two fixtures
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Flow Rate
- 3.4 GPM
- Wattage
- 14 kW
- Installation Location
- Indoor
- Temperature Control
- 86°F to 131°F
View on Amazon: ThermoMate 14kW Electric Tankless Water Heater
The ThermoMate 14kW 240V Electric Tankless Water Heater delivers on-demand hot water at flow rates up to 3.4 GPM. It relies on a cast aluminum heating block, operates at 240 volts, and adjusts temperatures between 86°F and 131°F via digital touch control. You need a 150-amp main electrical panel and a dedicated 60-amp double-pole breaker. It suits small homes, cabins, or apartments running one or two fixtures simultaneously.
Pros
- Delivers up to 3.4 GPM on-demand flow rate
- Cast aluminum heating block isolates water from electrical elements
- Digital touch control adjusts temperature from 86°F to 131°F
- Compact 15.9 x 11.2 x 3-inch footprint weighing 13.2 pounds
Cons
- Requires a minimum 150-amp main panel and a 60-amp breaker
- Flow rate of 3.4 GPM limits use to one or two fixtures
- Uses 1/2-inch NPT connections rather than 3/4-inch fittings
Good fit if
- You have an electrical panel with at least 150-amp total service capacity.
- You need hot water for one to two simultaneous fixtures such as a sink and shower.
- You want a wall-mounted unit for compact closets or small utility rooms.
Skip if
- You need to supply hot water to three or more fixtures at the same time.
- Your electrical panel cannot support a dedicated 60-amp double-pole circuit.
Verdict: ThermoMate 14kW 240V Electric Tankless Water Heater provides steady hot water for up to two fixtures when paired with a 60-amp double-pole breaker. Its cast aluminum heating design and compact enclosure make it a practical choice for small homes and apartments.
Stiebel Eltron Tempra 29 Plus 28.8kW Tankless
Best for: homes with 200-amp service needing high-output heating
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Wattage
- 28,800 W at 240 V
- Temperature Control
- Two temperature memory presets
- Dimensions
- 14.5 x 16.6 x 4.63 inches
- Weight
- 19 pounds
View on Amazon: Stiebel Eltron Tempra 29 Plus 28.8kW Tankless
The Stiebel Eltron Tempra 29 Plus is an electric tankless water heater designed for high-demand residential use. Operating at 240 volts, it delivers up to 28,800 watts of continuous heating power without venting. You can store your preferred settings using two digital temperature memory presets. This compact unit measures 14.5 by 16.6 by 4.63 inches, but it requires significant electrical infrastructure: 200-amp main service and three dedicated 40-amp circuit breakers.
Pros
- Delivers 28,800 watts of heating power at 240 volts
- Includes two temperature memory presets for easy adjustments
- Requires no venting, measuring 14.5 by 16.6 by 4.63 inches
- Supports both 240-volt and 208-volt hard-wired electrical setups
Cons
- Requires three dedicated 40-amp circuit breakers
- Requires minimum 200-amp total residential electrical service
- Demands 8-gauge copper wiring across all three circuits
Good fit if
- You have a 200-amp electrical panel with space for three dedicated 40-amp breakers.
- You want 28,800 watts of heating output without installing exhaust vents.
- You need quick switching between two preset water temperatures.
Skip if
- You have an electrical service panel rated below 200 amps.
- You cannot install three separate 40-amp breakers with 8-gauge copper wiring.
Verdict: Stiebel Eltron Tempra 29 Plus 28.8kW 240V provides high-capacity electric heating and memory presets for homes with heavy hot water requirements. Its 28,800-watt output demands substantial electrical capacity, including three 40-amp breakers and a 200-amp main service.
Ranein 18kW 4.3 GPM Electric Water Heater
Best for: two to three simultaneous household outlets
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Flow Rate
- 4.3 GPM
- Wattage
- 18 kW
- Temperature Control
- 86°F to 131°F, 1°F increments
- Certification
- CSA
The Ranein 18kW 240V Tankless Water Heater delivers up to 4.3 GPM of continuous hot water for small to medium households. It runs at 99% thermal efficiency and lets you adjust temperatures between 86°F and 131°F in 1°F steps using a digital display knob. If you need whole-home heating for two to three simultaneous fixtures, this wall-mounted unit supplies reliable capacity provided your electrical panel supports two 40A double-pole breakers.
Pros
- Maximum flow rate of 4.3 GPM for multi-outlet use
- Adjustable temperature range from 86°F to 131°F in 1°F increments
- High 99% thermal efficiency with stainless steel heating elements
- Standard 3/4-inch NPT plumbing connections
Cons
- Requires two dedicated 40A double-pole breakers and 8 AWG wiring
- Maximum output temperature is limited to 131°F
Good fit if
- You need up to 4.3 GPM to support two to three outlets at once.
- You have panel capacity for two separate 40A 240V circuits.
Skip if
- You need water temperatures higher than 131°F.
- You cannot support two dedicated 40A double-pole breakers.
Verdict: Ranein 18kW 240V Tankless Water Heater delivers solid 4.3 GPM whole-house flow with single-degree digital temperature adjustments. It is a practical choice if your electrical service can supply two dedicated 40A circuits.
WINTEMP 36kW Electric Tankless Water Heater
Best for: homes with 300-amp service and high demand
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Flow Rate
- 8.7 GPM
- Wattage
- 36kW
- Certification
- ETL Certified
- Dimensions
- 13.7 x 21.5 x 5.2 inches
This 240-volt electric tankless water heater delivers up to 36 kW of heating power and a maximum flow rate of 8.7 GPM. It includes built-in Wi-Fi for mobile temperature adjustments and self-modulating power output. You need a substantial electrical setup, including a recommended 300-amp service panel and four 40-amp double-pole breakers. It suits large households running three to five bathrooms simultaneously in mild to moderate climates.
Pros
- Maximum flow rate reaching up to 8.7 GPM
- High 36 kW power output on 240V
- Built-in Wi-Fi connectivity for mobile control
- Standard 3/4-inch NPT water connections
Cons
- Requires four 40A double-pole breakers and 150A maximum draw
- Recommends a 300A main electrical service panel
Good fit if
- You have a 300-amp electrical service panel capable of supporting 150 amps.
- You need up to 8.7 GPM to supply three to five bathrooms in mild climates.
- You want remote temperature control via a smartphone app.
Skip if
- You have a standard 100-amp or 200-amp home electrical panel.
- You cannot dedicate four separate 40-amp double-pole circuit breakers.
Verdict: WINTEMP 36kW WiFi Tankless Water Heater provides high flow rates for multi-bathroom homes with sufficient electrical capacity. Its self-modulating system and wireless controls offer precise management for heavy household demand.
EcoSmart 13 kW Electric Tankless Water Heater
Best for: moderate climates needing compact 13 kW heating
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Wattage
- 13 kW
- Dimensions
- 10 x 13.5 x 6.5 inches
- Weight
- 6.5 pounds
View on Amazon: EcoSmart 13 kW Electric Tankless Water Heater
The EcoSmart 13kW 240V Tankless Water Heater provides on-demand heating drawing 13 kW on a 240-volt electrical setup. At 6.5 pounds with dimensions of 10 by 13.5 by 6.5 inches, it fits into compact wall spaces. The manufacturer configures this electric unit for regions with incoming water temperatures around 60 degrees. It suits you if you need a lightweight, self-modulating 240V system for moderate-climate applications.
Pros
- Draws 13 kW at 240 volts
- Lightweight build at 6.5 pounds
- Compact dimensions of 10 by 13.5 by 6.5 inches
- Uses patented self-modulating technology
Cons
- Configured for incoming water temperatures near 60 degrees, limiting cold-climate use
- Lower 13 kW output than higher-wattage alternatives on the list
Good fit if
- You have incoming groundwater temperatures around 60 degrees.
- You need a compact 240V unit weighing only 6.5 pounds.
- You want self-modulating 13 kW electric heating.
Skip if
- You live in cold regions where inlet water drops significantly below 60 degrees.
- You require higher heating capacity than 13 kW.
Verdict: EcoSmart 13kW 240V Tankless Water Heater delivers 13 kW of self-modulating electric power in a compact 6.5-pound frame. It is an efficient 240V option if your incoming water temperature hovers near 60 degrees.
SIVUATEK 14kW 240V Electric Tankless Water Heater
Best for: one or two simultaneous fixtures
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Temperature Control
- 86°F to 131°F, 1°F increments
- Dimensions
- 15.87 x 11.14 x 2.87 inches
- Wattage
- 14 kW
- Weight
- 15.1 pounds
View on Amazon: SIVUATEK 14kW 240V Electric Tankless Water Heater
The SIVUATEK 14kW 240V Electric Tankless Water Heater provides on-demand hot water for one to two simultaneous fixtures, such as a kitchen sink and bathroom shower. It draws 14 kW on a 240V line and requires a single 60-amp breaker. You can set the LED display between 86°F and 131°F in 1°F steps, while standard 1/2-inch NPT connections handle plumbing.
Pros
- Runs on 14 kW with a single 60-amp breaker requirement
- Temperature range of 86°F to 131°F adjustable in 1°F increments
- Standard 1/2-inch NPT plumbing connections
- Wiring installs without disassembling the outer housing
Cons
- Capacity limited to 1 to 2 simultaneous usage points
- Maximum water temperature output is 131°F
Good fit if
- You need to supply hot water to one or two fixtures at the same time.
- You have a single dedicated 60-amp breaker available on your 240V panel.
Skip if
- You require whole-house hot water across three or more simultaneous fixtures.
- You need output water temperatures exceeding 131°F.
Verdict: SIVUATEK 14kW 240V Electric Tankless Water Heater delivers targeted heating for one to two outlets while keeping electrical needs to a single 60-amp breaker. Its external wiring access and 1°F digital temperature adjustments offer practical, predictable operation.
Orbek 14kW 240V Tankless Water Heater
Best for: small homes with 150-amp electrical panels
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Flow Rate
- 3.38 GPM
- Wattage
- 14 kW
- Temperature Control
- 86°F to 140°F, ±1°F
- Certification
- ETL
The Orbek 14kW 240V Tankless Water Heater delivers on-demand hot water with an output rated up to 3.38 GPM. Designed for 240V electrical setups, it requires a single 60A two-pole breaker and 6 AWG wiring. It fits compact spaces with its 14.2 by 9.5 by 3.1-inch dimensions. This unit suits you if you need steady hot water for two to three points of use.
Pros
- Provides up to 3.38 GPM flow rate
- Digital LED display allows temperature selection from 86°F to 140°F
- Compact footprint measuring 14.2 by 9.5 by 3.1 inches
- ETL listed with leakage and dry-heating protection
Cons
- Requires a household electrical panel with at least 150 amps of capacity
- Limited to 1/2-inch NPT water connections
Good fit if
- You need up to 3.38 GPM for two to three points of use.
- You have a 240V electrical panel rated for at least 150 amps with a 60-amp double-pole breaker.
Skip if
- You have a home electrical panel rated below 150 amps.
- You need plumbing connections larger than 1/2-inch NPT.
Verdict: Orbek 14kW 240V Tankless Water Heater provides steady temperature control and up to 3.38 GPM in a compact footprint for homes with adequate panel capacity.
Rheem 13kW Compact Electric Tankless Water Heater
Best for: moderate-flow point-of-use applications
- Voltage
- 240V (what this guide is about)
- Dimensions
- 12.6 × 8.25 × 3.63 inches
- Weight
- 3.97 pounds
View on Amazon: Rheem 13kW Compact Electric Tankless Water Heater
Rheem 13kW Compact Electric Tankless Water Heater runs on 240V power and pulls 54 amps. It delivers a maximum flow rate of 3.17 GPM using two copper immersion heating elements. The self-modulating control maintains temperatures to within 1°F on its digital LED display. This compact, 3.97-pound unit fits low-demand or single-fixture setups where you have standard 1/2-inch side compression connections and sufficient electrical capacity.
Pros
- Self-modulating power control with 1°F digital adjustments
- Flow rate reaches up to 3.17 GPM
- Field-serviceable dual copper immersion heating elements
- Compact footprint measuring 12.6 by 8.25 by 3.63 inches
- Includes 1/2-inch NPT adapters for side compression connections
Cons
- Requires a dedicated 54-amp electrical draw
- Maximum 3.17 GPM capacity restricts simultaneous high-volume fixtures
- Side-oriented water connections require lateral clearance
Good fit if
- You need a compact 240V heater delivering up to 3.17 GPM.
- You have electrical service capable of supplying 54 amps.
- You want precise single-degree digital temperature adjustments.
Skip if
- You need continuous hot water across multiple simultaneous high-flow fixtures.
- You lack electrical capacity for a 54-amp 240V load.
Verdict: Rheem 13kW Compact Electric Tankless Water Heater provides precise 1°F digital control and up to 3.17 GPM in a lightweight 3.97-pound chassis. It delivers efficient point-of-use heating provided your panel handles a 54-amp load.
SIVUATEK 14kW Electric Tankless Water Heater
Best for: dedicated single-fixture or point-of-use installations
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Wattage
- 14 kW
- Installation Location
- Point of use
- Certification
- ETL, qualifies for UL
- Dimensions
- 17.3 x 12.2 x 12.2 inches
View on Amazon: SIVUATEK 14kW Electric Tankless Water Heater
The SIVUATEK 14kW 240V Point-of-Use Water Heater delivers dedicated on-demand hot water for single fixtures like a shower or washing machine. Running on 240 volts with a 14-kilowatt output, it features self-modulating power technology and standard 1/2-inch NPT plumbing fittings. A digital touch display allows you to monitor and adjust output temperatures. It suits you if you need a compact, direct-feed unit close to your point of use.
Pros
- 14 kW heating system running on 240V electrical service
- Self-modulating control adjusts power in real time to match flow rate
- Digital display with integrated touch control panel
- Built-in leakage, overheat, and auto-stop safety protections
Cons
- Designed for point-of-use service rather than whole-home hot water demands
- No wireless connectivity or remote control functionality listed
Good fit if
- You need dedicated hot water for a single fixture such as a shower or sink.
- You have a 240V electrical connection ready near your installation point.
- You want push-button touch temperature controls with a digital readout.
Skip if
- You need a whole-house water heater to supply multiple bathrooms at once.
- You lack the electrical capacity required for a 14 kW, 240V appliance.
Verdict: SIVUATEK 14kW 240V Point-of-Use Water Heater delivers reliable, self-modulating temperature control for dedicated point-of-use fixtures.
Westinghouse 24kW WiFi Tankless Water Heater
Best for: smart homes needing whole-house 24kW electric heating
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Flow Rate
- 5.55 GPM
- Wattage
- 24kW
- Dimensions
- 17 x 13 x 4.3 inches
- Use
- Whole House
View on Amazon: Westinghouse 24kW WiFi Tankless Water Heater
This 240V electric tankless water heater from Westinghouse delivers 24kW of heating power with a maximum flow rate of 5.55 GPM. It activates at a minimum flow of 0.79 GPM and connects via bottom 3/4-inch NPT fittings. Integrated Wi-Fi provides app monitoring alongside voice control through Alexa or Google Home. You get whole-house capacity in a compact 17-by-13-by-4.3-inch wall-mounted profile if your electrical panel supports three 40-amp double-pole breakers.
Pros
- Delivers up to 5.55 GPM maximum flow rate
- Built-in Wi-Fi with Alexa and Google Home voice control
- Standard bottom 3/4-inch NPT water connections
- Compact wall-mount footprint measuring 17 x 13 x 4.3 inches
Cons
- Requires 100A electrical service using three 40A double-pole breakers
- Needs a minimum flow rate of 0.79 GPM to activate heating
Good fit if
- You have an electrical panel with capacity for three 40A double-pole breakers and 8 AWG wiring.
- You want smart app or voice adjustments for water temperature via Alexa or Google Home.
- You need up to 5.55 GPM of continuous hot water for concurrent fixtures.
Skip if
- You cannot dedicate three 40-amp double-pole breakers to water heating.
- You frequently use low-flow fixtures running below the 0.79 GPM activation threshold.
Verdict: Westinghouse 24kW Wi-Fi Tankless Water Heater pairs strong 24kW heating output and 5.55 GPM flow with modern Wi-Fi connectivity for voice and app control. It is an effective whole-home electric solution if your panel handles the 100-amp requirement.
NOVIEEX 13kW 240V Electric Tankless Water Heater
Best for: Single-bathroom homes with 60A electrical capacity
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Flow Rate
- 3.6 GPM
- Wattage
- 13kW
- Installation Location
- Indoor
- Temperature Control
- 77°F to 140°F, 1°F increments
View on Amazon: NOVIEEX 13kW 240V Electric Tankless Water Heater
The NOVIEEX 13kW unit delivers up to 3.6 GPM at 240V. It features a slim 11.14" W x 15.86" H profile and precise temperature control from 77°F to 140°F in 1°F increments. This model suits single-bathroom homes or apartments needing 1-2 simultaneous water points. Its 99.8% efficiency eliminates standby loss. You get stable hot water without the bulk of traditional tanks.
Pros
- 13kW power output at 240V
- Max flow rate of 3.6 GPM
- Adjustable temperature in 1°F increments
- Slim wall-mounted design saves space
- 99.8% heating efficiency
Cons
- Requires a 60A double-pole circuit breaker
- Indoor installation only
- 1-year warranty coverage
Good fit if
- You need hot water for one bathroom
- You have limited wall space for installation
- You want precise temperature adjustments
Skip if
- You require whole-house capacity
- Your electrical panel cannot support 60A
- You need outdoor-rated equipment
Verdict: NOVIEEX 13kW 240V Electric Tankless fits single-bathroom homes needing compact, efficient hot water. It offers precise control and high efficiency for tight spaces. Choose this if you have the required 60A electrical setup.
Specifications side by side
| Spec | Rheem 18kW 240V Electric Tankless Water Heater | Camplux 6000W 240V Point-of-Use Tankless Water Heater | VEVOR 30-Gallon 5000W Electric Water Heater | Thermomate 18kW Electric Tankless Water Heater | ThermoMate 14kW Electric Tankless Water Heater | Stiebel Eltron Tempra 29 Plus 28.8kW Tankless | Ranein 18kW 4.3 GPM Electric Water Heater | WINTEMP 36kW Electric Tankless Water Heater | EcoSmart 13 kW Electric Tankless Water Heater | SIVUATEK 14kW 240V Electric Tankless Water Heater | Orbek 14kW 240V Tankless Water Heater | Rheem 13kW Compact Electric Tankless Water Heater | SIVUATEK 14kW Electric Tankless Water Heater | Westinghouse 24kW WiFi Tankless Water Heater | NOVIEEX 13kW 240V Electric Tankless Water Heater |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fuel Type | Electric | Electric | Electric | Electric | Electric | Electric | Electric | Electric | Electric | Electric | Electric | not specified | Electric | Electric | Electric |
| Flow Rate | 4.4 GPM | 1.07 GPM at 35°F rise | not specified | Up to 4.4 GPM | 3.4 GPM | not specified | 4.3 GPM | 8.7 GPM | not specified | not specified | 3.38 GPM | not specified | not specified | 5.55 GPM | 3.6 GPM |
| Wattage | 18 kW | 6000 W | 5000 W | 18kW | 14 kW | 28,800 W at 240 V | 18 kW | 36kW | 13 kW | not specified | 14 kW | not specified | 14 kW | 24kW | 13kW |
| Installation Location | not specified | not specified | not specified | not specified | Indoor | not specified | not specified | not specified | not specified | not specified | not specified | not specified | Point of use | not specified | Indoor |
| Capacity | not specified | not specified | 30 gal | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified |
| Voltage | 240 V | 240 V | 240 V | 208~240 Volt | 240 V | 240 V | 240 V | 240V | 240 V | 240 V | 240 V | not specified | 240 V | 240V | 240V |
| Temperature Control | ±1°F | not specified | not specified | 80°F to 140°F, 1° increment | 86°F to 131°F | Two temperature memory presets | 86°F to 131°F, 1°F increments | not specified | not specified | 86°F to 131°F, 1°F increments | 86°F to 140°F, ±1°F | not specified | not specified | not specified | 77°F to 140°F, 1°F increments |
| Certification | not specified | ETL Listed | not specified | ETL | ETL | not specified | CSA | ETL Certified | not specified | not specified | ETL | not specified | ETL, qualifies for UL | not specified | not specified |
| Dimensions | 3.5 x 14.5 x 18.5 inches | 10.95 x 7.4 x 2.52 inches | 40.2 x 17.7 x 17.7 inches | 17.12" x 13.12" x 3.12" | 15.9" x 11.2" x 3" | 14.5 x 16.6 x 4.63 inches | 18.7 x 13.8 x 3.1 inches | 13.7 x 21.5 x 5.2 inches | 10 x 13.5 x 6.5 inches | 15.87 x 11.14 x 2.87 inches | 14.2 x 9.5 x 3.1 inches | not specified | 17.3 x 12.2 x 12.2 inches | 17 x 13 x 4.3 inches | 15.86" H x 11.14" W x 3.18" D |
| Use | Whole House | not specified | Commercial | not specified | not specified | not specified | Whole House | not specified | not specified | not specified | not specified | not specified | not specified | Whole House | not specified |
| Features | not specified | not specified | not specified | not specified | not specified | not specified | not specified | WiFi | not specified | not specified | not specified | not specified | not specified | WiFi | not specified |
| Weight | 14.8 pounds | 4.9 pounds | 74.5 pounds | not specified | 13 pounds | 19 pounds | 17.4 pounds | 36.1 pounds | 6.5 pounds | 15.1 pounds | not specified | 3.97 pounds | 16 pounds | 17 pounds | not specified |
| Size | Small | not specified | 30 Gal | 18kW | not specified | 29 (kW) | not specified | 36kW | 12 x 8 x 4 | not specified | S-14 | Compact | S-14 | L-24 | not specified |
| Color | Gray | White | Gray | Gray | Gray | White | Gray | Gray | color | Gray | Pearl | Gray | Black | Gray 24 | Silver |
| Model | RTEX-18 | TE06ProN5 | FJI-POR-120S2 | ET180 | EH140 | 239223 | RE18K | WN36 | ECO 11 | TSB-140 | 14kW 2.0 Model | RTEX-13 | V7B-140B | WET-24K-G | DS-18 |
Is 240V Worth It for Your Tankless Water Heater?
All 15 models in this guide use 240V power. This voltage enables the high wattage ratings needed for instant hot water. You get precise temperature control and consistent flow without the need for gas lines. However, 240V demands specific electrical infrastructure. Higher wattage units require dedicated breakers, such as dual 40-amp circuits for 18kW models. You must verify your panel capacity before installation. This feature is standard for electric tankless systems, ensuring reliable performance for whole-house or point-of-use applications.
Worth it if
- You have an existing 240V electrical outlet or panel capacity for dedicated circuits.
- You want precise digital temperature control without gas line installation.
- You need high-flow output for multiple simultaneous fixtures.
Skip it if
- Your electrical panel lacks the amperage for the required wattage.
- You prefer gas-powered heating for lower operating costs.
- You only need hot water for a single sink with low flow.
If you also need heating, see our guide to the best 240V space heaters for spec-based comparisons.
How We Selected 240V Heaters
We identified every unit by checking the title and feature list for the 240V specification. This voltage requirement ensures compatibility with standard residential electrical systems. We only included one size or variant for each product family to keep the list clear. All data comes directly from the published specifications on the Amazon listings. We do not handle these products physically. We rely solely on the manufacturer's published data for every detail in this guide.
The final ranking orders products by availability first. Next, we sorted by the listing's overall rating weighted by the total number of ratings. Finally, we considered how many of our core criteria each unit's specs met. This method ensures you see the most relevant and highly rated 240V tankless water heaters at the top. The list includes 15 picks for 2026.
How to Choose the Right One
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Match Wattage to Use
Wattage determines how much hot water you get. Higher wattage means higher flow rates. The Rheem 18kW unit provides up to 4.4 GPM for whole-house use. If you only need one sink, the Camplux 6000W point-of-use model is sufficient. Match the kilowatt rating to your daily hot water needs. Do not oversize for a single faucet. Do not undersize for a full bathroom. Check the wattage spec to ensure the unit meets your flow requirements.
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Check Electrical Panel Capacity
Your home’s electrical panel must support the breaker requirements. The Stiebel Eltron Tempra 29 Plus needs three 40-amp breakers and a 200-amp main service. The ThermoMate 14kW requires a single 60-amp double-pole breaker. The Westinghouse 24kW unit demands a 100-amp panel. Verify your panel has enough space and capacity. Installing a high-wattage unit on an insufficient panel causes tripping or damage. Always check the breaker spec before buying.
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Verify Installation Location
Some units are for indoor use only. The ThermoMate 14kW and Thermomate 18kW are rated for indoor installation. The Camplux 6000W is designed for point-of-use spots like under a sink. The VEVOR 30-Gallon unit is for small commercial setups. Ensure your installation spot matches the rating. Outdoor models need weatherproofing. Indoor models need proper ventilation. Check the installation location spec to avoid damage or voided warranties. Place the unit where it fits safely.
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Assess Physical Dimensions
Tankless heaters vary in size. The Rheem 13kW Compact is small at 8.25 inches wide. The VEVOR 30-Gallon unit is large at 40.2 inches tall. The Camplux 6000W is tiny at 7 inches wide. Measure your space before purchasing. Ensure there is room for connections and maintenance. The Stiebel Eltron Tempra 29 Plus is 16.6 inches wide. The SIVUATEK 14kW is 12.2 inches wide. Check width, height, and length specs. Fit the unit into your designated area.
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Consider Smart Features
Some units offer WiFi connectivity. The WINTEMP 36kW and Westinghouse 24kW models include WiFi. This allows remote control via apps. The Rheem 18kW and EcoSmart 13kW do not list WiFi. Decide if remote monitoring is important. WiFi adds convenience but may increase complexity. Check the features spec. If you want voice control or app adjustments, select a WiFi-enabled model. If you prefer simple operation, a standard unit works fine. Match the feature set to your lifestyle.
Frequently asked questions
Can a 240V tankless heater run multiple bathrooms?
Yes, but only if the unit has sufficient wattage. The WINTEMP 36kW model supports high flow rates for multi-bathroom homes. It requires 300-amp service to handle the load. Lower wattage units like the Camplux 6000W are for single sinks only. Choose higher kW ratings for whole-house coverage.
What is the smallest 240V electric tankless water heater?
The Camplux 6000W is the most compact option. It measures 7 by 10 by 7 inches and weighs 4.9 pounds. This size fits tight under-sink spaces. It is designed for point-of-use applications rather than whole-house heating. Its small footprint makes it ideal for dedicated sink installations.
Do I need a 200-amp panel for these heaters?
Not all units require 200-amp service. The Stiebel Eltron Tempra 29 Plus does need a 200-amp main service with three 40-amp breakers. However, the SIVUATEK 14kW runs on a single 60-amp breaker. Match your panel capacity to the specific wattage requirements of your chosen model.
Which 240V heater offers Wi-Fi connectivity?
Two models in this list include Wi-Fi. The WINTEMP 36kW provides wireless controls for precise management. The Westinghouse 24kW also features Wi-Fi for app and voice control. These units allow you to monitor and adjust settings remotely. Check the features list to confirm connectivity for your specific needs.
How much space does an 18kW heater take?
Dimensions vary by brand. The Rheem 18kW model measures 14.5 by 3.5 by 18.5 inches. The Thermomate 18kW is slightly wider at 13.1 by 17.1 by 13.1 inches. Both are compact enough for most utility closets. Measure your installation space before selecting a specific 18kW unit.
Are there commercial-grade 240V options available?
The VEVOR 30-Gallon unit is rated for commercial use. It provides 5000W heating with 30 gallons of stored capacity. This model suits small commercial setups needing reliable supply. Note that its tank dimensions require substantial installation space. It differs from standard tankless units by offering stored hot water.
What is the maximum flow rate for 240V heaters?
Flow rates depend on wattage and inlet water temperature. The Westinghouse 24kW delivers up to 5.55 GPM. The Rheem 18kW provides up to 4.4 GPM. The Ranein 18kW offers 4.3 GPM. Higher wattage generally supports higher flow rates for simultaneous fixture use.
Can I install these heaters outdoors?
Most listed models are for indoor use. The Thermomate 18kW and 14kW specify indoor installation locations. The Camplux brand mentions outdoor life, but its specific TE06ProN5 model is for under-sink use. Always check the installation location specification in the data before placing a unit outside.