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Best whole house electric tankless water heaters - Holiday Sale 2025

Last Updated - December 14, 2025

1
Best Choice

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Westinghouse

Westinghouse 27kW 240V Tankless Water Heater Electric, Instant Hot Water Heater, On Demand Hot Water, Smart WiFi Control, Compatible with Alexa & Google Home, (APOLO-27kw)

Westinghouse

$579.99

More Details
Main highlights
- 【WHOLE HOUSE HOT WATER】 The Apolo-27kW tankless water heater delivers endless hot water for your entire home. With a flow rate of up to 6.26 GPM, it effortlessly handles 2 bathrooms and appliances like dishwashers and washing machines simultaneously — eliminating waits and fluctuations.
- 【SPACE-SAVING WHOLE-HOUSE SOLUTION】 Free up valuable floor space! Unlike bulky tank heaters, this compact tankless unit (17"H × 13"W × 4.3"D) mounts flush to your wall. Its streamlined design is the perfect, space-efficient solution for bringing continuous hot water to every faucet in your home or large apartment.
- 【SMART WI-FI VOICE CONTROL】 Remotely control water temperature and power the unit on/off via app button or voice commands (Alexa/Google Home compatible). Adjust settings from 86°F to 140°F in 1° increments. The easy-access rotary knob and clear LED display offer convenient local control and real-time status monitoring.
- 【POWERFUL & EFFICIENT 27kW PERFORMANCE】 Engineered for whole-house demands, this 240V unit delivers robust 27kW heating power. Activation flow: 0.79 GPM. Compatible with standard residential electrical setup using 3 x 40 Amp (DP) breakers and 3 x 8 AWG wiring. Features 3/4" NPT water connections for optimal flow.
- 【ETL SAFETY CERTIFIED & DURABLE IPX4】 Operate with peace of mind. ETL certified with comprehensive 4-layer protection (leakage, overheat, dry-fire, high voltage). Features IPX4 waterproof rating and separated water-electricity pathways to combat corrosion and scaling, ensuring long-lasting reliability and minimal maintenance.
- Important Notes: up to 6.26 GPM for APOLO-27kW. Activation flow: 0.79 GPM. Amperage (amps): 113A. The product works and is compatible with 3 X 40 AMP (DP) breakers and 3 X 8 AWG wire.Bottom 3/4" NPT water connections
$579.99
2
16% Off

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Rheem
16% Off

Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray

Rheem

$454.41

$546.86
(16% Off)

More Details
Main highlights
- PROVEN PERFORMANCE: Continuous hot water when you need it for the whole home (review performance guide image to confirm this water heater will provide the hot water needed based on geographic location). Ground water temperature impacts temperature rise and gallons per minute.
- ELECTRICAL REQUIREMENTS: 3 x 40 AMP Double Pole Breakers Required. 200 AMP Household service recommended. Ensure your home can accomodate the power supply and that enough space is available in your breaker panel for this unit.
- EFFICIENT: Tankless electric water heaters save space, energy, money, and require no venting.
- EASILY ADJUSTABLE: ON/OFF Dial Control with adjustable digital temperature display allows for adjustments in 1-degree increments from 80-140 degrees F.
$454.41
$546.86 (16% Off)
3
Best Value
21% Off

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

WINTEMP
21% Off

Electric Tankless Water Heater WINTEMP 27kW 240V, Whole House Hot Water Supply, On Demand Instant Endless Water Heater, with LED Temperature Display, WiFi Control, Up to 6.3 GPM, ETL Certified

WINTEMP

$288.99

$369.99
(21% Off)

More Details
Main highlights
- Stable Water Temperature: Automatically adjusts energy consumption based on incoming water temperature and flow rate to ensure maximum efficiency, continuous stable temperature, and optimal power usage. Its maximum hot water output is 6.5 gallons per minute. It is perfect for residential shower use, eliminating the need to wait for preheating. There’s no longer any concern about running out of hot water in the tank, and you won’t experience temperature fluctuations during your shower
- Space Saving: The WN27 features a wall-mounted compact design, occupying 90% less space compared to traditional tank water heaters. It is suitable for tight areas and can be easily installed anywhere. It provides an endless supply of hot water in a short time without the need to wait for preheating. Equipped with remote WiFi control, you can adjust the temperature without being near the water heater
- Safe Usage: Safety is always WINTEMP’s top priority. The product features multiple safety protections, including leakage protection, overheat protection, and dry-fire protection, and is ETL certified to fully ensure your safety, allowing you to enjoy hot water anytime, anywhere with peace of mind. We also provide a 2-year return and exchange warranty along with long-term professional technical support to give you worry-free use
- Important Note: Ensure this tankless water heater meets your installation requirements. The WN27 model is rated at 27KW (240V) with a maximum amperage of 113A. It requires 3 x 40 Amp double-pole (DP) breakers and 3 x 8/2 AWG wiring with ground, with a recommended 250A household power supply. The unit dimensions are 11.1” (W) x 19.1 ” (H) x 4” (D), the water connection is 3/4" NPT
- Energy Saving: The self-regulating technology adjusts power input based on real-time flow and temperature settings. When the water flow decreases, the system reduces power usage, and when not in use, it consumes no energy, achieving up to 99% energy savings. Compared with traditional tank water heaters, it is more energy-efficient and space-saving, making it suitable for 2–4 usage points in the home
$288.99
$369.99 (21% Off)
4

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Rheem

Rheem 18kW 240V Tankless Electric Water Heater, Gray

Rheem

$427.34

$449.00
(4% Off)

More Details
Main highlights
- Threaded for easy replacement, simple installation, digital temperature display
- Simple installation – bottom 3/4 inch NPT water connections
- Most advanced self-modulation, adjust power to meet hot water demand
- External digital thermostatic control with LED display (+/1 degree accuracy)
- Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
$427.34
$449.00 (4% Off)
5
20% Off

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

WINTEMP
20% Off

WINTEMP 36kW Tankless Electric Water Heater 240V, Instant On-Demand Endless Hot Water, Up to 8.7 GPM, LED Temperature Display, Whole House Supply, WiFi Control, ETL Certified

WINTEMP

$375.99

$469.99
(20% Off)

More Details
Main highlights
- Stable Water Temperature: Automatically adjusts energy consumption based on incoming water temperature and flow rate to ensure maximum efficiency, a consistently stable temperature, and optimal power usage. With a maximum hot water output of 8.7 gallons per minute, it’s ideal for residential showers — no need to wait for preheating, no risk of running out of hot water, and no more temperature fluctuations during your shower
- Space Saving: The WN36 features a wall-mounted compact design, occupying 90% less space compared to traditional tank water heaters. It is suitable for tight areas and can be easily installed anywhere. It provides an endless supply of hot water in a short time without the need to wait for preheating. Equipped with remote WiFi control, you can adjust the temperature without being near the water heater
- Safe Usage: Safety is always WINTEMP’s top priority. The product features multiple safety protections, including leakage protection, overheat protection, and dry-fire protection, and is ETL certified to fully ensure your safety, allowing you to enjoy hot water anytime, anywhere with peace of mind. We also provide a 2-year return and exchange warranty along with long-term professional technical support to give you worry-free use
- Important Note: Please ensure this tankless water heater meets your installation requirements. The WN36 model is rated at 36KW (240V) with a maximum current draw of 150A. It requires 4 x 40 Amp double-pole (DP) breakers and 4 x 8/2 AWG cables with ground. A 300A household power supply is recommended. Unit dimensions: 13.7” (W) x 21.1” (H) x 5.3” (D). Water connection: 3/4" NPT
- Energy Saving: The self-regulating technology adjusts power input based on real-time flow and temperature settings. When the water flow decreases, the system reduces power usage, and when not in use, it consumes no energy, achieving up to 99% energy savings, suitable for 3-5 usage points in the home
$375.99
$469.99 (20% Off)

Best whole house electric tankless water heaters - Holiday Sale 2025

Westinghouse 27kW 240V Tankless Water Heater Electric, Instant Hot Water Heater, On Demand Hot Water, Smart WiFi Control, Compatible with Alexa & Google Home, (APOLO-27kw)

Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray

Electric Tankless Water Heater WINTEMP 27kW 240V, Whole House Hot Water Supply, On Demand Instant Endless Water Heater, with LED Temperature Display, WiFi Control, Up to 6.3 GPM, ETL Certified

Rheem 18kW 240V Tankless Electric Water Heater, Gray

WINTEMP 36kW Tankless Electric Water Heater 240V, Instant On-Demand Endless Hot Water, Up to 8.7 GPM, LED Temperature Display, Whole House Supply, WiFi Control, ETL Certified

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