10 Best Whole House Electric Tankless Water Heater of December 2025

• 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

Ecosmart

• 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

Stiebel Eltron

• 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

Rheem

• 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.

CAMPLUX

• 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

Ecosmart

• 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

Eemax

• 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

Rheem

• 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

Ecosmart

• 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

Rheem

• Tankless Water Heater
• 220 V
• 54 Max Amps

Titan