15 Best 8 kW Tankless Water Heaters, Compared
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Choosing the best 8 kW tankless water heaters comes down to matching electrical demands with your target flow rate. This guide compares 15 products based strictly on the specifications published on the listings.
The Rheem 8 kW Multi-Fixture Tankless Water Heater takes the top spot because it supplies up to 1.95 GPM with 1-degree digital temperature adjustments on a single 40-amp breaker. This comparison helps you decide which model fits your cabinet space, electrical service, and daily point-of-use hot water needs.
Quick picks
The best fit for you
- You need multi-fixture heating up to 1.95 GPM Rheem 8 kW Multi-Fixture Tankless Water Heater It delivers up to 1.95 GPM using a single 40-amp breaker on 240-volt electric service.
- You want smart WiFi control under a sink Westinghouse 8kW Smart WiFi Tankless Water Heater It provides integrated WiFi connectivity for 8 kW heating on a 240-volt line.
- You need a lightweight heater under five pounds EcoSmart 8 kW Electric Tankless Water Heater The unit weighs 4.75 pounds while providing 8 kW of electric heating output.
- You have tight space requiring certified lead-free heating Titan Compact Electric Tankless Water Heater It measures 2.5 by 7 by 2.5 inches and carries UL and ETL Lead Free certifications.
Our 15 picks
Rheem 8 kW Multi-Fixture Tankless Water Heater
Best for: multi-fixture point-of-use setups up to 1.95 GPM
- Wattage
- 8 kW (what this guide is about)
- Fuel Type
- Electric
- Voltage
- 240V
- Dimensions
- 12.6 × 8.25 × 3.63 inches
- Weight
- 8 pounds
View on Amazon: Rheem 8 kW Multi-Fixture Tankless Water Heater
This 8 kW electric tankless water heater from Rheem runs on 240-volt power and delivers a flow rate of up to 1.95 GPM for multiple fixtures. You set the output using digital thermostatic controls that adjust in 1-degree increments from 80°F to 140°F. Measuring 12.6 by 8.25 by 3.63 inches, it suits you if you need compact point-of-use heating backed by standard 40-amp electrical service.
Pros
- Delivers up to 1.95 GPM flow rate for multiple fixtures
- Digital thermostatic control adjusts from 80°F to 140°F in 1-degree increments
- Compact dimensions of 12.6 by 8.25 by 3.63 inches weighing 8 pounds
- Requires only one 40-amp double-pole breaker and #8 AWG wire
Cons
- Maximum flow rate is limited to 1.95 GPM
- Requires a recommended minimum 100-amp main electrical service panel
Good fit if
- You need up to 1.95 GPM across multiple fixtures.
- You want 1-degree temperature control between 80°F and 140°F.
- You have a 240V setup with a dedicated 40-amp breaker.
Skip if
- You need water flow greater than 1.95 GPM.
- You have an electrical service panel smaller than 100 amps.
Verdict: Rheem 8 kW Multi-Fixture Tankless Water Heater balances precise 1-degree digital temperature adjustments with a 1.95 GPM flow rate on a single 40-amp breaker. It provides dependable multi-fixture heating in compact spaces.
Stiebel Eltron Tempra 29 Plus 28.8kW Tankless
Best for: homes with 200-amp service needing preset controls
- Wattage
- 8 kW (what this guide is about)
- Fuel Type
- Electric
- Voltage
- 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
This electric tankless water heater operates on a 240-volt electrical service, delivering on-demand hot water without venting. It features two customizable temperature memory presets and measures 14.5 by 16.6 by 4.63 inches. The unit requires 200-amp main electrical service and three dedicated 40-amp breakers with 8-gauge copper wiring. It suits you if you need a high-capacity electric unit and have the panel capacity to support substantial electrical demand.
Pros
- Two temperature memory presets for quick adjustments
- No venting required for installation
- Compact dimensions of 14.5 x 16.6 x 4.63 inches
- Operates on 240-volt or 208-volt electrical service
Cons
- Requires a minimum of 200-amp total residential electrical service
- Requires three separate dedicated 40-amp breakers
- Needs 8-gauge copper wiring across three separate circuits
Good fit if
- You have at least 200-amp main service available in your home.
- You want two programmable temperature memory presets.
- You have panel capacity for three dedicated 40-amp breakers.
Skip if
- You have an electrical panel rated below 200 amps.
- You cannot accommodate three separate dedicated 40-amp circuits.
Verdict: Stiebel Eltron Tempra 29 Plus Tankless Water Heater delivers non-vented on-demand heating with dual temperature presets. It serves homes equipped with a 200-amp service panel ready for three dedicated 40-amp circuits.
Ranein 8kW Electric Tankless Water Heater
Best for: one or two low-demand fixtures
- Wattage
- 8 kW (what this guide is about)
- Fuel Type
- Electric
- Flow Rate
- 1.9 GPM
- Voltage
- 240 V
- Temperature Control
- 86°F to 131°F, 1°F increments
- Dimensions
- 9.06 x 6.7 x 2.34 in
The Ranein 8 kW electric tankless water heater delivers up to 1.9 GPM on a 240-volt electrical supply with a single 40-amp breaker. Measuring 9.06 by 6.7 by 2.34 inches, it fits compact spaces and uses standard 1/2-inch NPT connections. You can adjust water output from 86°F to 131°F in 1°F increments using the front knob and LED display, making it suitable for one to two low-demand fixtures.
Pros
- Delivers a flow rate up to 1.9 GPM
- Temperature adjusts from 86°F to 131°F in 1°F increments
- Wiring connects without needing to disassemble the housing
- Compact casing measuring 9.06 by 6.7 by 2.34 inches
Cons
- Maximum flow rate caps at 1.9 GPM
- Water temperature cannot be set above 131°F
Good fit if
- You have a dedicated 240-volt line with a single 40-amp breaker.
- You want single-degree temperature adjustments on an LED screen.
- You are supplying hot water to only one or two fixtures.
Skip if
- You need more than 1.9 GPM of simultaneous hot water.
- You require water temperatures higher than 131°F.
Verdict: Ranein 8 kW Tankless Water Heater with LED Display pairs precise 1°F temperature tuning with a compact footprint for one to two fixtures. It draws 8 kW at 240 volts through a single 40-amp breaker to supply up to 1.9 GPM.
WINTEMP 13.8kW Electric Tankless Water Heater
Best for: point-of-use sinks and warm-climate single showers
- Wattage
- 8 kW (what this guide is about)
- Fuel Type
- Electric
- Flow Rate
- 3.1 GPM
- Voltage
- 240V
- Temperature Control
- 86°F - 140°F
- Certification
- ETL Certified
View on Amazon: WINTEMP 13.8kW Electric Tankless Water Heater
The WINTEMP 13.8kW Electric Tankless Water Heater provides on-demand heating for sinks and warm-climate showers. Running on 240 volts, it delivers up to 3.1 GPM with self-modulating power that adjusts output to your water flow. It operates between 86°F and 140°F and measures 9.7 by 14.1 by 3.3 inches. This unit suits you if you need compact point-of-use heating or service for one to two bathrooms in moderate climates.
Pros
- Delivers up to 3.1 GPM flow rate
- Adjustable temperature range from 86°F to 140°F
- Self-modulating heating adjusts to real-time water flow
- Compact wall-mount profile measuring 9.7 x 14.1 x 3.3 inches
- Built-in leakage, overheat, and dry-heating protection
Cons
- Requires a 60A double-pole breaker and 6 AWG copper wiring
- Restricted to sinks and point-of-use fixtures in colder climates
- Uses 1/2-inch NPT water connections
Good fit if
- You have a 240V line with a dedicated 60A double-pole breaker.
- You need up to 3.1 GPM for point-of-use sinks or a warm-climate shower.
- You want precise temperature adjustments between 86°F and 140°F.
Skip if
- You live in a cold climate and need whole-home shower coverage.
- Your panel cannot handle a 58A maximum current draw.
- You require plumbing connections larger than 1/2-inch NPT.
Verdict: WINTEMP 13.8kW Electric Tankless Water Heater delivers up to 3.1 GPM using automated self-modulating power. It serves as an efficient 240V solution for point-of-use fixtures or warm-climate single showers.
EcoSmart 8 kW Electric Tankless Water Heater
Best for: compact wall spaces requiring 8 kW electric heating
- Wattage
- 8 kW (what this guide is about)
- Fuel Type
- Electric
- Dimensions
- 4 × 8 × 12 inches
- Weight
- 4.75 pounds
View on Amazon: EcoSmart 8 kW Electric Tankless Water Heater
The EcoSmart 8 kW Electric Tankless Water Heater delivers on-demand hot water using an electric heating setup. At 12 inches high, 8 inches wide, and 4 inches deep, this compact white unit weighs just 4.75 pounds, making it easy to mount in tight utility spaces. If you need a dedicated 8 kW electric water heater for a small space or single point of use, this compact model fits standard setups neatly.
Pros
- Delivers 8 kW of electric heating output
- Compact dimensions measuring 12 by 8 by 4 inches
- Lightweight design at 4.75 pounds
Cons
- No digital temperature display listed in specifications
- No remote control included in product data
Good fit if
- You need an 8 kW electric water heater for tight mounting areas.
- You prefer a lightweight unit weighing under 5 pounds.
Skip if
- You require a gas-fueled water heater instead of electric.
- You want a model that lists an integrated digital screen.
Verdict: EcoSmart 8 kW Electric Tankless Water Heater provides electric heating in a frame that weighs under five pounds. It gives you standard 8 kW output while taking up minimal wall space.
VEVOR 8 kW Electric Tankless Water Heater
Best for: compact 240V installations needing digital touch control
- Wattage
- 8 kW (what this guide is about)
- Fuel Type
- Electric
- Voltage
- 240V
- Temperature Control
- 86°F-140°F or higher
- Dimensions
- 3.3"W x 14"H x 9.7"L
- Weight
- 6.83 pounds
This wall-mounted VEVOR unit provides on-demand heating at 8 kW and 240 volts. It features a cast aluminum heating element designed to separate water from electrical components, alongside an IMD touch screen and digital LED display. With adjustable output between 86°F and 140°F, it requires a single 40A breaker and 10 AWG wiring. It suits you if you need a compact, digital point-of-use heater for standard 1/2-inch NPT plumbing lines.
Pros
- Cast aluminum heating element isolates water from electrical components
- IMD touch screen with digital LED display for temperature setting
- Temperature output range spans from 86°F to 140°F
- Standard 1/2-inch NPT inlet and outlet fittings
Cons
- Requires a dedicated 240V electrical connection
- No remote control included for off-unit adjustments
- Limited to 1/2-inch NPT plumbing connections without external adapters
Good fit if
- You have a 240V electrical setup with a 40A breaker and 10 AWG wiring.
- You want direct digital touchscreen control over water output temperatures.
- You use standard 1/2-inch NPT plumbing connections.
Skip if
- You only have a 120V electrical connection available.
- You need 3/4-inch plumbing connections without using adapters.
- You prefer remote or wireless temperature adjustments.
Verdict: VEVOR 8 kW Electric Tankless Water Heater delivers on-demand output up to 140°F using an isolated cast aluminum heating element and digital touch screen. It provides a straightforward solution for point-of-use spaces wired for 240V service.
Titan Compact Electric Tankless Water Heater
Best for: tight spaces needing certified lead-free heating
- Wattage
- 8 kW (what this guide is about)
- Certification
- UL, ETL Lead Free
- Dimensions
- 7 x 2.5 x 2.5 inches
View on Amazon: Titan Compact Electric Tankless Water Heater
This Titan unit provides on-demand heating in an ultra-compact build measuring 7 by 2.5 by 2.5 inches. It features a cream casing, patented design assembly, and certified lead-free construction under ETL and UL standards. You get endless hot water while taking up minimal wall space. It suits you if you need a certified electric tankless heater engineered for tight installations where standard cabinet or wall clearances are limited.
Pros
- Compact 7 by 2.5 by 2.5 inch dimensions save space
- ETL Lead Free certified and UL compliant
- Patented design assembly
Cons
- No digital temperature display listed
- Only listed in a cream finish
Good fit if
- You have limited installation space and need a small footprint.
- You require ETL Lead Free certification and UL compliance.
Skip if
- You need a digital screen to monitor water temperature.
- You prefer a white or black finish instead of cream.
Verdict: Titan Compact Electric Tankless Water Heater delivers continuous hot water in a small footprint with UL and ETL Lead Free certifications. It fits tight locations where larger wall-mounted heaters cannot go.
WINTEMP 8kW Single Fixture Tankless Water Heater
Best for: single-sink point-of-use installations in small spaces
- Wattage
- 8 kW (what this guide is about)
- Fuel Type
- Electric
- Voltage
- 240 V
- Dimensions
- 9.7"W × 14"H × 3.4"D
- Weight
- 7.9 pounds
View on Amazon: WINTEMP 8kW Single Fixture Tankless Water Heater
The WINTEMP 8kW Single Fixture Tankless Water Heater provides on-demand hot water for dedicated point-of-use setups. It runs on a 240V electrical connection requiring a 40A double-pole breaker and 10 AWG wiring, drawing up to 33A. With standard 1/2-inch NPT connections and a compact 9.7 by 14-inch profile, it suits you if you need reliable sink handwashing or dish cleaning in an apartment, cabin, garage, or office without taking up floor space.
Pros
- Operates on 240V drawing up to 33A with 10 AWG wiring
- Compact wall-mounted profile measuring 9.7 by 14 by 3.4 inches
- Equipped with digital temperature control, dry-heating, and overheat protection
- Standard 1/2-inch NPT water connections
Cons
- Engineered strictly for single fixtures rather than whole-home demand
- Not built to support multiple showers or high flow rates
Good fit if
- You need dedicated hot water for a single kitchen, utility, or bathroom sink.
- You have a 240V setup equipped with a 40A double-pole breaker and 10 AWG wire.
Skip if
- You require whole-house heating or simultaneous multi-fixture hot water supply.
- You need high-flow water heating performance in cold climates.
Verdict: WINTEMP 8kW Single Fixture Tankless Water Heater delivers direct, on-demand heating for single-sink setups in tight spaces. Its compact 240V design fits small utility areas without requiring multi-breaker electrical upgrades.
Camplux 8 kW Point-of-Use Water Heater
Best for: under-sink installation serving up to two faucets
- Wattage
- 8 kW (what this guide is about)
- Fuel Type
- Electric
- Flow Rate
- 1.56 GPM at 35°F rise
- Voltage
- 240 Volt
- Temperature Control
- Maximum 131°F
- Certification
- ETL
This Camplux unit is an 8 kW electric tankless water heater designed for point-of-use service. It runs on a 240-volt circuit and draws up to 33.3 amps, delivering 1.56 GPM at a 35°F temperature rise. The side-mounted half-inch NPT connections suit tight under-sink spaces. If you need dedicated hot water for up to two sinks without running new high-amperage subpanels, this heater fits your setup.
Pros
- Delivers 1.56 GPM at a 35°F temperature rise
- Requires a single 40A double-pole breaker and 8 AWG wire
- Side-mounted 1/2-inch NPT water connections simplify under-counter installation
- Self-modulating flow sensor adjusts power based on demand
Cons
- Requires a minimum flow rate of 0.47 GPM to activate
- Maximum output temperature is capped at 131°F
- 8.5-inch depth is bulkier than flat-panel designs
Good fit if
- You need dedicated hot water for one or two point-of-use faucets.
- You have an electrical panel with capacity for a 40-amp double-pole breaker.
- You prefer side-facing water connections for tight under-counter plumbing.
Skip if
- You need hot water for high-demand whole-home fixtures or simultaneous showers.
- Your low-flow faucets run below the 0.47 GPM activation threshold.
- You require water temperatures above 131°F.
Verdict: Camplux 8 kW Point-of-Use Water Heater delivers reliable point-of-use heating for up to two faucets using a single 40-amp circuit. Its side-connection layout and self-modulating control make it practical for compact under-sink utility.
VancEpic 8kW Point-of-Use Electric Tankless Water Heater
Best for: one or two point-of-use fixtures
- Wattage
- 8 kW (what this guide is about)
- Fuel Type
- Electric
- Voltage
- 240V
- Temperature Control
- 86°F to 131°F, 1°F increments
- Dimensions
- 10.69 x 7.85 x 2.76 inches
- Weight
- 6.6 pounds
View on Amazon: VancEpic 8kW Point-of-Use Electric Tankless Water Heater
The VancEpic 8kW Point-of-Use Electric Tankless Water Heater runs on 240 volts and requires a single 40-amp circuit breaker. It connects to 1/2-inch NPT plumbing lines and supplies one to two fixtures on demand. You adjust water temperature from 86°F to 131°F in 1°F increments using front knob controls and an LED display. This compact unit suits you if you need dedicated hot water for a couple of nearby fixtures.
Pros
- Precise adjustment from 86°F to 131°F in 1°F increments
- Requires only a single 40-amp breaker on 240 volts
- Wiring connects without disassembling the housing
- Heating elements are separated from water to prevent scale
Cons
- Maximum heating temperature caps at 131°F
- Capacity limited to one or two fixtures
Good fit if
- You need hot water for one or two point-of-use fixtures.
- You have a 240V electrical connection with a single 40A breaker.
- You want knob-based temperature control with an LED display.
Skip if
- You need to supply more than two fixtures at the same time.
- You require water temperatures higher than 131°F.
Verdict: VancEpic 8kW Point-of-Use Electric Tankless Water Heater provides precise single-degree temperature settings for up to two fixtures on a 40-amp breaker.
Westinghouse 8kW Smart Electric Tankless Water Heater
Best for: single-sink installations requiring smart Wi-Fi temperature control
- Wattage
- 8 kW (what this guide is about)
- Fuel Type
- Electric
- Voltage
- 240V
- Temperature Control
- 80–130°F
- Dimensions
- 6.9 x 8.1 x 2.5 inches
View on Amazon: Westinghouse 8kW Smart Electric Tankless Water Heater
This 8 kW electric tankless water heater delivers point-of-use hot water on a 240V electrical supply. Measuring 6.9 by 8.1 by 2.5 inches, it fits inside compact spaces under a sink. It offers Wi-Fi app integration with voice control and allows temperature settings from 80°F to 130°F. It suits you if you need dedicated hot water for an individual handwashing or kitchen sink.
Pros
- Wi-Fi app control with Alexa and Google Home support
- Adjustable temperature range from 80°F to 130°F
- Compact footprint measuring 6.9 x 8.1 x 2.5 inches
- Standard 1/2-inch NPT water connections
Cons
- Restricted to single-sink use and not suitable for showers
- Requires a dedicated 40A double-pole breaker that is not included
Good fit if
- You need on-demand hot water for a single sink or vanity.
- You want to adjust water temperature using Wi-Fi or voice commands.
- You have a 240V panel connection wired with 10 AWG conductors.
Skip if
- You need a heater capable of supplying a shower.
- You require whole-home or multi-fixture hot water delivery.
Verdict: Westinghouse 8kW Smart Electric Tankless Water Heater provides precise temperature adjustments and Wi-Fi connectivity for single-sink setups. Its compact 240V design fits tight under-sink spaces while limiting service to one fixture at a time.
Electrolux 8kW Under-Sink Smart Water Heater
Best for: smart under-sink faucet temperature control
- Wattage
- 8 kW (what this guide is about)
- Fuel Type
- Electric
- Installation Location
- Under Sink
- Voltage
- 240V
- Temperature Control
- 80°F – 140°F
- Dimensions
- 8.9" x 3.35" x 3.35"
View on Amazon: Electrolux 8kW Under-Sink Smart Water Heater
The Electrolux 8kW Under-Sink Smart Water Heater is a 240V electric point-of-use unit designed for dedicated sink applications. It requires a single 40A circuit and delivers water adjustable from 80°F to 140°F. Built-in WiFi allows temperature adjustments via a smartphone app or Alexa voice commands. Measuring 8.9 by 3.35 by 3.35 inches, it suits you if you need a compact water heater inside a cabinet or vanity.
Pros
- Built-in WiFi and Alexa voice control for remote temperature adjustments
- Wide operating temperature range from 80°F to 140°F
- Compact 8.9-by-3.35-by-3.35-inch footprint weighing 7.8 pounds
- Standard 1/2-inch NPT connections with a single 40A circuit requirement
Cons
- Not engineered for shower use
- Restricted to single-sink or vanity fixtures
Good fit if
- You want smart app or Alexa voice control for sink temperature adjustments.
- You have a dedicated 240V 40A circuit available near an under-sink installation.
Skip if
- You need a water heater capable of supplying a shower.
- You require a multi-fixture or whole-home heating setup.
Verdict: Electrolux 8kW Under-Sink Smart Water Heater provides targeted point-of-use performance for handwashing sinks with connected app and voice adjustments. Its compact body fits easily inside cabinets powered by a single 40A breaker.
Electrolux 8kW Under Sink Tankless Water Heater
Best for: single-sink handwashing and dish rinsing setups
- Wattage
- 8 kW (what this guide is about)
- Fuel Type
- Electric
- Flow Rate
- 1.97 GPM
- Voltage
- 240 V
- Temperature Control
- max 104°F
- Certification
- CSA, IPX4
View on Amazon: Electrolux 8kW Under Sink Tankless Water Heater
The Electrolux 8kW Under Sink Tankless Water Heater is a compact 240V electric unit designed for point-of-use sink applications. It delivers up to 1.97 GPM at a 77°F temperature rise and caps output at a maximum temperature of 104°F. Requiring a single dedicated 40A circuit and measuring 6.9 by 8.1 by 2.5 inches, it suits you if you need reliable hot water for handwashing or dish rinsing in tight spaces.
Pros
- Compact 6.9 x 8.1 x 2.5 inch footprint fits tight under-sink spaces
- Requires only a single dedicated 40A circuit at 240V
- Delivers up to 1.97 GPM with a 77°F temperature rise
- Separated heating element designed to resist scale and corrosion
Cons
- Maximum water temperature is capped at 104°F
- Not engineered or rated for shower use
- Limited to a 1-year manufacturer warranty
Good fit if
- You need hot water dedicated to a single sink or vanity faucet.
- You have a single 40A, 240V electrical circuit available.
- You have tight clearance requiring an enclosure depth under 3 inches.
Skip if
- You need an electric water heater to supply a shower.
- You require water temperatures exceeding 104°F.
Verdict: Electrolux 8kW Under Sink Tankless Water Heater provides efficient point-of-use performance for single faucets with minimal electrical and physical space demands. Its 104°F ceiling and flow rate clearly limit it to dedicated sink duty rather than bathing.
Westinghouse 8kW Smart WiFi Tankless Water Heater
Best for: smart app-controlled under-sink handwashing installations
- Wattage
- 8 kW (what this guide is about)
- Fuel Type
- Electric
- Voltage
- 240V
- Temperature Control
- 80°F-130°F
- Dimensions
- 6.9 x 8.1 x 2.5 inches
- Features
- WiFi
View on Amazon: Westinghouse 8kW Smart WiFi Tankless Water Heater
The Westinghouse 8kW Smart WiFi Tankless Water Heater runs on a 240V supply and requires a single 40A circuit breaker. It delivers point-of-use hot water with an adjustable output between 80°F and 130°F. Sized at 6.9 by 8.1 by 2.5 inches with 1/2-inch NPT fittings, it fits under sinks and connects to WiFi for Alexa, Google Home, and app control. This setup suits you if you need smart control at a handwashing or kitchen sink.
Pros
- WiFi connectivity with Alexa and Google Home voice control
- Requires a single dedicated 40A circuit on 240V
- Compact dimensions of 6.9 x 8.1 x 2.5 inches fit under sinks
- Adjustable temperature range from 80°F to 130°F
Cons
- Not designed or rated for shower applications
- Restricted to single-sink point-of-use installations
Good fit if
- You want to adjust sink water temperature remotely using an app or voice assistant.
- You have a dedicated 240V, 40A electrical line available under a sink.
- You need a compact unit fitting within 6.9 by 8.1 by 2.5 inches.
Skip if
- You need to heat water for a shower.
- You require whole-home or multi-fixture simultaneous hot water.
Verdict: Westinghouse 8kW Smart WiFi Tankless Water Heater provides dedicated under-sink heating with smart wireless temperature adjustments. It gives you reliable point-of-use performance for single-faucet setups without taking up cabinet space.
VEVOR 8 kW Electric Tankless Water Heater
Best for: single-fixture point-of-use sinks and showers
- Wattage
- 8 kW (what this guide is about)
- Fuel Type
- Electric
- Voltage
- 240 V
- Temperature Control
- 86–131°F / 30–55°C
- Dimensions
- 13.3 x 8.5 x 8.5 in
- Weight
- 8.82 pounds
The VEVOR 8 kW Electric Tankless Water Heater provides on-demand hot water for single-person showers and handwashing sinks. It runs on a 240-volt electrical supply and requires a circuit breaker rated above 40 amps paired with 8 AWG wiring. You can adjust the temperature from 86°F to 131°F using the built-in LED touch panel. It suits you if you need compact point-of-use heating with real-time temperature tracking.
Pros
- Cast aluminum heating element with water-electric separation
- LED touch panel with 86–131°F temperature adjustment
- Real-time sensor monitors temperature to reduce fluctuations
- Compact 8.82-pound frame measuring 13.3 by 8.5 by 8.5 inches
Cons
- Requires a dedicated breaker rated above 40 amps and 8 AWG wire
- Sized strictly for single-person showers and handwashing
Good fit if
- You need on-demand heating for a single handwashing sink or shower.
- You have a 240V connection with an available breaker over 40A and 8 AWG wire.
- You want direct digital adjustments through an LED touch screen.
Skip if
- You need to run multiple hot water fixtures at the same time.
- You lack a 240V supply or wiring rated for 8 AWG.
Verdict: VEVOR 8 kW Electric Tankless Water Heater delivers steady point-of-use output with digital touch controls and a scale-resistant aluminum element. It reliably serves single-fixture installations wired for 240 volts and over 40 amps.
Specifications side by side
| Spec | Rheem 8 kW Multi-Fixture Tankless Water Heater | Stiebel Eltron Tempra 29 Plus 28.8kW Tankless | Ranein 8kW Electric Tankless Water Heater | WINTEMP 13.8kW Electric Tankless Water Heater | EcoSmart 8 kW Electric Tankless Water Heater | VEVOR 8 kW Electric Tankless Water Heater | Titan Compact Electric Tankless Water Heater | WINTEMP 8kW Single Fixture Tankless Water Heater | Camplux 8 kW Point-of-Use Water Heater | VancEpic 8kW Point-of-Use Electric Tankless Water Heater | Westinghouse 8kW Smart Electric Tankless Water Heater | Electrolux 8kW Under-Sink Smart Water Heater | Electrolux 8kW Under Sink Tankless Water Heater | Westinghouse 8kW Smart WiFi Tankless Water Heater | VEVOR 8 kW Electric Tankless Water Heater |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fuel Type | not specified | Electric | Electric | Electric | Electric | Electric | not specified | Electric | Electric | Electric | Electric | Electric | Electric | Electric | Electric |
| Flow Rate | not specified | not specified | 1.9 GPM | 3.1 GPM | not specified | not specified | not specified | not specified | 1.56 GPM at 35°F rise | not specified | not specified | not specified | 1.97 GPM | not specified | not specified |
| Wattage | not specified | 28,800 W at 240 V | 8 kW | 13.8kW | 8-kW | 8KW | 11.8 kW | 8 kW | 8kW | 8kW | 8kW | 8 kW | 8 kW | 8kW | 8 kW |
| Installation Location | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | Under Sink | not specified | not specified | not specified |
| Voltage | not specified | 240 V | 240 V | 240V | not specified | 240V | not specified | 240 V | 240 Volt | 240V | 240V | 240V | 240 V | 240V | 240 V |
| Temperature Control | not specified | Two temperature memory presets | 86°F to 131°F, 1°F increments | 86°F - 140°F | not specified | 86°F-140°F or higher | not specified | not specified | Maximum 131°F | 86°F to 131°F, 1°F increments | 80–130°F | 80°F – 140°F | max 104°F | 80°F-130°F | 86–131°F / 30–55°C |
| Certification | not specified | not specified | not specified | ETL Certified | not specified | not specified | UL, ETL Lead Free | not specified | ETL | not specified | not specified | not specified | CSA, IPX4 | not specified | not specified |
| Dimensions | not specified | 14.5 x 16.6 x 4.63 inches | 9.06 x 6.7 x 2.34 in | 9.7 x 14.1 x 3.3 inches | not specified | 3.3"W x 14"H x 9.7"L | 7 x 2.5 x 2.5 inches | 9.7"W × 14"H × 3.4"D | 12.2 x 8.5 x 8.5 in | 10.69 x 7.85 x 2.76 inches | 6.9 x 8.1 x 2.5 inches | 8.9" x 3.35" x 3.35" | 6.9 x 8.1 x 2.5 in | 6.9 x 8.1 x 2.5 inches | 13.3 x 8.5 x 8.5 in |
| Use | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | Under Sink | Under Sink | not specified | not specified |
| Features | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | WiFi | not specified |
| Weight | 8 pounds | 19 pounds | not specified | 9.85 pounds | 4.75 pounds | 6.83 pounds | not specified | 7.9 pounds | 8.8 pounds | 6.6 pounds | not specified | 7.8 pounds | not specified | not specified | 8.82 pounds |
| Color | Gray | White | Gray | Gray | White | Black | cream | Gray | White | White | Deep Blue | Pearl White | Pearl White | Gray | Black |
| Model | RTEX-08 | 239223 | RE8K-U (8kW) | WN13 | ECO 8 | JN08 | N-120 | YQ-WN8K | TEW08N | RE8K | WET-08K-G | 8kW | 8kW | WET-08K-B | R1T-80 |
| Size | not specified | 29 (kW) | not specified | 13.8kW | 12 x 8 x 4 | 8KW | not specified | WN-08 | not specified | not specified | S-8 | E-8 kW | not specified | S-8 | not specified |
Is 8 kW the Right Wattage for Your Setup?
An 8 kW rating determines your maximum flow rate and electrical load. Most models on this list draw power through a single 40-amp breaker at 240 volts. This output supports point-of-use fixtures like kitchen sinks or showers in warm climates. You get precise temperature control, often with 1-degree adjustments, but the flow rate caps around 1.95 GPM. This wattage is not designed for whole-home simultaneous use. It is strictly for dedicated, localized hot water needs.
Worth it if
- You need a dedicated 40-amp circuit for a single sink or shower
- You want precise digital temperature adjustments for point-of-use fixtures
- You are installing in a compact space with limited electrical capacity
Skip it if
- You need to run multiple high-flow fixtures simultaneously
- You require whole-home hot water capacity
- You have only a 20-amp circuit available
You might also want to see the best DREO space heaters in 2024: 12 picks.
How we selected 8 kW models
We gathered 15 tankless water heaters by scanning Amazon listings for the specific attribute: Wattage: 8 kW. We only included one variant from each product family to keep the comparison clean. Every detail in this guide comes directly from the specifications and feature lists published on those listings. We do not handle or test these units ourselves. All information is based on what the manufacturers state in their product data.
The products are ordered by availability first, then by the listing's overall rating weighted by how many ratings it has, then by how many of the guide's criteria the specs meet. We focused strictly on published specifications. We did not test products or quote customer reviews. Prices and stock levels are shown live on the page and are refreshed at least daily.
How to choose the right 8 kW heater
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Match flow rate to fixtures
Your target flow rate depends on how many faucets run at once. The Rheem RTEX-08 supports up to 1.95 GPM for multi-fixture use. If you only need one sink, the WINTEMP YQ-WN8K serves a single fixture efficiently. Higher flow rates require more power. Check the GPM rating to ensure the unit handles your daily water usage without dropping temperature. Smaller units may struggle with simultaneous use.
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Check electrical breaker capacity
Most 8 kW models require a dedicated 40-amp breaker at 240 volts. The Camplux TEW08N and Rheem RTEX-08 both operate on this standard setup. Ensure your panel has space for this circuit. Some larger units, like the Stiebel Eltron 239223, may need multiple circuits or a 200-amp service panel. Verify your electrical panel capacity before installation. Using the wrong breaker size can cause tripping or safety hazards during operation.
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Measure cabinet space carefully
Physical dimensions determine if the unit fits your installation spot. The Titan N-120 is extremely thin at 2.5 inches wide. The VancEpic RE8K measures 7.79 inches wide. The Westinghouse WET-08K-G is also very narrow at 2.48 inches. Measure your under-sink or utility closet space before buying. Ensure there is room for water connections and ventilation. Compact models are ideal for tight cabinets where larger heaters will not fit.
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Select digital temperature control
Digital displays allow precise temperature adjustments. The Rheem RTEX-08 offers 1-degree adjustments for exact heat levels. The VEVOR JN08 uses a digital touch screen. The Westinghouse WET-08K-G provides smart Wi-Fi control for remote adjustments. Digital controls prevent scalding and ensure consistent water heat. Analog knobs may drift over time. Look for units with clear LED displays or app connectivity for easy monitoring and setting changes.
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Verify fuel and voltage type
All listed models are electric and run on 240 volts. This eliminates the need for gas lines or venting. Electric units are safer for indoor installations like under sinks. The EcoSmart ECO 8 and VEVOR JN08 both use standard electric service. Confirm your location has 240V access. Gas models require exhaust vents. Electric heaters are simpler to install but rely entirely on electrical capacity. Check your wiring before purchasing any electric tankless unit.
Frequently asked questions
Can an 8 kW tankless heater run a shower?
Yes, but only in warm climates or for single-fixture use. The WINTEMP 13.8kW model delivers up to 3.1 GPM, making it suitable for showers in mild regions. Other 8 kW units like the Rheem RTEX-08 provide up to 1.95 GPM, which is better suited for sinks. Check your local groundwater temperature to ensure the unit can raise the water to a comfortable shower temperature.
Do I need a 200-amp electrical panel for these heaters?
Most models on this list require only a single 40-amp breaker at 240 volts. This includes the Rheem RTEX-08 and the VEVOR JN08. However, high-capacity units like the Stiebel Eltron Tempra 29 Plus are designed for homes with 200-amp service panels. Always verify your panel capacity before installation to ensure the dedicated circuit can handle the load safely.
Which 8 kW heater is best for tight under-sink spaces?
The Titan N-120 and Westinghouse WET-08K-G are ideal for tight spots. The Titan unit measures just 2.5 inches wide, while the Westinghouse smart model is only 2.48 inches wide. Both fit easily into small cabinets. The Westinghouse model also offers Wi-Fi connectivity for remote temperature adjustments, which is useful for under-sink installations that are hard to reach.
Do these units have digital temperature displays?
Many models include digital controls for precise temperature tuning. The Rheem RTEX-08 and Ranein RE8K-U offer 1-degree adjustments. The VEVOR JN08 features a digital touch screen. The Electrolux 8kW Under Sink model allows voice and app adjustments. These digital interfaces help you set the exact water temperature needed for handwashing or dish rinsing without guessing.
Is 8 kW enough for multiple faucets running at once?
Only the Rheem RTEX-08 is designed for multi-fixture use, supporting up to 1.95 GPM. Most other 8 kW units are limited to single-sink or point-of-use applications. The WINTEMP YQ-WN8K and Electrolux 8kW Under Sink models are intended for dedicated sink duty. Running multiple fixtures simultaneously with a standard 8 kW unit will likely result in reduced flow or temperature.
Are there smart Wi-Fi enabled 8 kW heaters?
Yes, several models offer smart connectivity. The Westinghouse WET-08K-G and WET-08K-B provide Wi-Fi control for remote temperature adjustments. The Electrolux 8kW Under Sink model supports connected app and voice adjustments. These features allow you to monitor and change settings from your phone, which is convenient for managing water temperature in remote or hard-to-access locations.