10 Best Whole House Electric Tankless Water Heater of December 2025
List of Top Rated Whole House Electric Tankless Water Heater from thousands of customer reviews & feedback.
Updated On Dec 2025
1,093 Reviews Studied
1
EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology,... Read Review
- Savings of up to 50% on water heating costs. Dimensions :17H x 17W x 3.625D inches ;Pipes fittings :3/4 inch NPT
- Digital temperature control in 1-degree increments allows control of hot water; Activation Flow: 0.3 GPM
- Copper and stainless components designed for efficiency, durability and easy replacement.
- Compact size saves valuable storage space, while the stylish and advanced design is pleasing to the eye and Copper and stainless components designed for efficiency, durability and easy replacement.
- Prior to purchase & installation, please verify that this model is the right size for your hot water needs and electrical requirements. Electrical requirements: 27 kW, 240 volts, (3) 40 required breakers, 112.5 maximum power (AMP), (3) 8 required wire.Amperage Draw:113 A
- Required Breaker Quantity: Three 40 Amp Double Pole
- Recommended Electrical Panel: 200 Amps
- NEVER run out of hot water with an ECOSMART tankless water heater.
- Save up to 12 cubic feet of storage space.
- Digital temperature control in 1-degree increments gives users complete control of hot water
2
Stiebel Eltron 224199 240V, 1 Phase, 50/60 Hz, 24 kW Tempra 24 Plus Whole House Tankless Electric Water Heater, Advanced... Read Review
- Digital temperature control. Voltage : 240 Volt or 208 Volt
- Proven reliability
- No venting required
- Sleek design fits anywhere
- Save at least 15-20% on the hot water portion of your electric bill
3
Rheem 240V 2 Heating Chambers RTEX-18 Residential Tankless Water Heater, small, GREY Read Review
- 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
4
Camplux Electric Tankless Water Heater, TE27 Whole House Instant Water Heater, On Demand Electric Water Heater Digital D... Read Review
- SMART & CONSIDERED DESIGN - The point of use tankless water heater design with touch control & digital display, save space, smart and easy to set temperature. Comes with remote smart controller, very convenient even install under sink.
- RELIABLE AND DURABLE- The 27kW tankless water heater comes with multiple protection. NFS approved, offer lead-free water. ETL safety certified, leakage and overheat protection device to ensure your safety. Stainless steel component for high efficiency and durability.
- INSTANT ENDLESS HOT WATER - Enjoy instant and endless hot water! The on demand tankless water heater rated power up to 87,500 BTU. Easy to get water between 86°F - 125°F.
- MINIMUM ACTIVATION WATER FLOW - Camplux electric tankless water heaters just need 0.85 GPM water flow for activation. No need to waiting and pre-heating. Get hot water in seconds.
- COMPACT DESIGN & MULTI-ANGLED MOUNTING - The compact size electric water heater requires a connection of 3* 50A 2 poles circuit breaker. Install close to outlet for energy saving. Can be mounted Multi-angled, ideal for kitchen, school, hospital and hair salon. Please make sure it is the right size for you: 27kW at 240V, product dimensions 15.15" x 10.23" x 3.66", water pipes fitting: 3/4" NPT male.
5
Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater Read Review
- Sleek and compact design with digital output temperature display
- ECOSMART tankless water heaters are 99.8-percent energy efficient
- Manufactured in United States
- Pipe Fittings:3/4 inch NPT
- Required Breaker:4 x 40 A
- 150 A
6
Eemax EEM24027 Electric Tankless Water Heater, Blue Read Review
- Tank less water heaters provide a continuous Supply of hot water and only heats the water you need, when you need it
- Instant, consistent and endless hot water
- The most advanced, self-modulating technology available, meaning the unit will adjust how much energy needs to be input based on how much hot water is needed
- Compact size saves valuable storage space
- Before purchase and installation, Please verify that this EEM24027 is the correct size for your hot water needs
7
Rheem 240V 4 Heating Chambers RTEX-36 Residential Tankless Water Heater Read Review
- External digital thermostatic control with LED display (+/1 degree accuracy)
- Most advanced self-modulation, adjust power to meet hot water demand
- Durable Copper immersion four heating elements, field Serviceable
- Simple installation – bottom 3/4 inch NPT water connections
- Threaded for easy replacement, simple installation, digital temperature display.Amperage:150 amps.A max flow of 8.0 GPM
8
EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology Read Review
- Lifetime warranty
- Save up to 60-percent on your water heating cost with an ECOSMART electric tankless water heater
- Never run out of hot water with an ECOSMART tankless water heater
- Patented Self Modulating Technology and design
- ECOSMART tankless water heaters are 99.8-percent energy efficient.Uniform Energy Factor:0.98
9
Rheem 240V 3 Heating Chambers RTEX-24 Residential Tankless Water Heater, GRAY Read Review
- 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
- Flow Rate: up to 5.9 GPM