Best EcoSmart Tankless Water Heaters: 7 Models Compared

Quick picks

Our 7 picks

1 Best overall

EcoSmart 13 kW Electric Tankless Water Heater

Best for: moderate climates with 240V electrical connections

Fuel Type

Electric

Wattage

13 kW

Voltage

240 V

Dimensions

10 x 13.5 x 6.5 inches

Weight

6.5 pounds

View on Amazon: EcoSmart 13 kW Electric Tankless Water Heater

EcoSmart 13kW Electric Tankless Water Heater runs on 240 volts and draws 13 kW of electric power. It features patented self-modulating technology and weighs 6.5 pounds with compact dimensions of 10 by 13.5 by 6.5 inches. The system is configured specifically for climates where incoming water temperatures are around 60 degrees. You get an electric setup designed for these moderate inlet conditions.

Pros

• Draws 13 kW on a 240V electric connection
• Includes patented self-modulating technology
• Lightweight build at 6.5 pounds
• Compact dimensions of 10 x 13.5 x 6.5 inches

Cons

• Requires a 240-volt electrical supply
• Configured for incoming water temperatures near 60 degrees

Good fit if

• You live in a climate with incoming water temperatures near 60 degrees.
• You have a dedicated 240-volt electric connection.
• You need a lightweight unit weighing 6.5 pounds.

Skip if

• You live in cold climates where incoming water drops well below 60 degrees.
• You only have a 120-volt electrical supply.

Verdict: EcoSmart 13kW Electric Tankless Water Heater delivers 13 kW of self-modulating heating in a lightweight 6.5-pound frame. It is engineered specifically for homes in climates with incoming water temperatures near 60 degrees.

2 Best premium

EcoSmart 8 kW Electric Tankless Water Heater

Best for: compact spaces needing 8 kW electric heating

Fuel Type

Electric

Wattage

8-kW

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 is a compact electric heating unit designed for on-demand hot water. It operates on an 8 kW heating capacity and measures 12 inches high by 8 inches wide and 4 inches deep. Weighing 4.75 pounds, it mounts in tight indoor spaces. This setup suits you if your installation demands a light electric unit with minimal physical bulk.

Pros

• 8 kW electric heating output
• Compact dimensions of 12 by 8 by 4 inches
• Lightweight build at 4.75 pounds

Cons

• 8 kW output is lower than higher-capacity whole-home models
• Electric power source only with no gas fuel option listed

Good fit if

• You need an electric tankless unit that provides 8 kW of heating capacity.
• You require a compact unit measuring 12 by 8 by 4 inches.
• You want a lightweight heater weighing under 5 pounds.

Skip if

• You need higher output than 8 kW for large simultaneous demands.
• You prefer a gas-fueled water heater.

Verdict: EcoSmart 8 kW Electric Tankless Water Heater delivers 8 kW of heating capacity in a compact 4.75-pound enclosure. It fits restricted wall spaces where a low-profile electric unit is needed.

3 Best budget

EcoSmart 2.5-Gallon Point-of-Use Mini Tank

Best for: single-sink point-of-use hot water

Fuel Type

Electric

Installation Location

Point-of-Use

Capacity

2.5 gallons

Voltage

120 V

Dimensions

17 x 10.9 x 10.9 inches

Weight

15.8 pounds

View on Amazon: EcoSmart 2.5-Gallon Point-of-Use Mini Tank

The EcoSmart 2.5-Gallon Point-of-Use Water Heater is an electric storage unit designed for tight spaces. It holds 2.5 gallons of water and runs on a standard 120-volt connection drawing 12 amps. You do not need venting, and the included power cord plugs straight into an outlet. This unit suits you if you need dedicated hot water directly under a sink without modifying your home electrical panel.

Pros

• Includes appliance line cord with plug for standard outlet connection
• Requires no venting for point-of-use installation
• Operates on 120-volt service at 12 amps
• Digital output temperature display

Cons

• Limited capacity capped at 2.5 gallons rather than continuous flow
• Weighs 15.8 pounds before adding water

Good fit if

• You have an existing 120-volt outlet near your sink.
• You need a compact 2.5-gallon water source without installing ventilation.

Skip if

• You need continuous hot water for showers or high-demand fixtures.
• You lack 17 by 10.9-inch clearance under your cabinet or installation space.

Verdict: EcoSmart 2.5-Gallon Point-of-Use Water Heater provides dedicated under-sink hot water through a standard 120-volt plug-in design without venting. It fits single-fixture setups that need small-volume storage rather than continuous whole-home supply.

4 Also great

EcoSmart 3.5kW 120V Point-of-Use Tankless Heater

Best for: single low-flow sink installations on 120V power

Fuel Type

Electric

Wattage

3.5kW

Installation Location

Point of Use

Voltage

120v

Dimensions

11 x 11 x 7 inches

Weight

4 pounds

View on Amazon: EcoSmart 3.5kW 120V Point-of-Use Tankless Heater

This is a compact electric point-of-use tankless water heater designed for dedicated, low-flow fixtures. It runs on a standard 120V electrical supply and draws 3.5kW of power. Measuring 11 by 11 by 7 inches and weighing 4 pounds, it mounts easily in tight cabinet spaces. It suits you if you need consistent, on-demand hot water at a single sink without installing a 240V circuit or storing water in a tank.

Pros

• Operates on standard 120V electrical service
• Compact 11 by 11 by 7-inch footprint
• Lightweight build weighing 4 pounds
• Heats water only when used

Cons

• Limited 3.5kW output restricted to low-flow applications
• Point-of-use design cannot supply whole-home demand

Good fit if

• You need on-demand hot water for a single low-flow fixture.
• You have a dedicated 120V electrical connection near the sink.
• You need a compact 4-pound unit for tight under-sink spaces.

Skip if

• You need to provide hot water to multiple fixtures at once.
• You require a high-capacity heater for whole-house use.

Verdict: EcoSmart 3.5kW 120V Point-of-Use Tankless Heater provides a compact, 4-pound solution for single low-flow fixtures running on standard 120V power. It delivers steady on-demand hot water where space is too limited for a standard water tank.

5 Also great

EcoSmart 6 kW Point-of-Use Electric Water Heater

Best for: single low-flow hand sinks in small spaces

Fuel Type

Electric

Flow Rate

1 GPM

Wattage

6 KW

Installation Location

Point of Use

Dimensions

6 x 11 inches

Width

11 inches

View on Amazon: EcoSmart 6 kW Point-of-Use Electric Water Heater

The EcoSmart 6 kW Point-of-Use Electric Water Heater provides on-demand heating for single fixtures. Operating at 6 kW with an electric power source, it supports flow rates up to 1 GPM. With dimensions of 6 by 11 inches and a weight of 3.85 pounds, it fits into compact spaces. This model suits you if you need dedicated hot water for a hand sink in an RV, boat, office, or commercial setting.

Pros

• Draws 6 kW of electric heating power
• Compact footprint measuring 6 by 11 inches
• Lightweight build at 3.85 pounds
• Serves single point-of-use setups up to 1 GPM

Cons

• Maximum flow rate capped at 1 GPM
• Designed only for single point-of-use applications

Good fit if

• You need a dedicated heater for a single hand sink.
• You have limited installation space in an RV, boat, or office.
• You require a flow rate that does not exceed 1 GPM.

Skip if

• You need to supply hot water to multiple fixtures simultaneously.
• You require a flow rate greater than 1 GPM.

Verdict: EcoSmart 6 kW Point-of-Use Electric Water Heater delivers compact 6 kW electric heating for single-sink setups. Its 1 GPM capacity makes it a practical choice for dedicated low-flow installations.

6 Best 36 kw

EcoSmart 36 kW Electric Tankless Water Heater

Best for: homes with 150-amp dedicated electrical capacity

Fuel Type

Electric

Wattage

36 kW

Voltage

240 V

Dimensions

17 x 21 x 3.6 inches

Weight

18.4 pounds

View on Amazon: EcoSmart 36 kW Electric Tankless Water Heater

This EcoSmart unit delivers 36 kW of heating power on a 240-volt electrical supply. It features standard 3/4-inch NPT pipe fittings and a digital output temperature display. With a compact depth of 3.6 inches and an efficiency rating of 99.8 percent, it mounts on your wall without taking up floor space. You will find it suits high-demand heating needs if your home panel supports a 150-amp draw.

Pros

• 99.8 percent energy efficiency rating
• High 36 kW heating output
• Digital output temperature display
• Standard 3/4-inch NPT pipe connections
• Slim 3.6-inch depth profile

Cons

• Requires four 40-amp circuit breakers
• Requires 150 amps of electrical capacity

Good fit if

• You have electrical capacity for a 150-amp, 240-volt load.
• You need 3/4-inch NPT plumbing connections for your installation.
• You want a digital display to monitor output water temperature.

Skip if

• You lack panel capacity for four 40-amp double-pole breakers.
• You only have a 120-volt electrical connection available.

Verdict: EcoSmart 36 kW Electric Tankless Water Heater provides 36 kW output and 99.8 percent efficiency for setups with sufficient 240-volt electrical infrastructure. It concentrates heavy heating capacity into an 18.4-pound wall-hung cabinet.

7 Also great

EcoSmart 120V Point of Use Tankless Water Heater

Best for: single-sink handwashing in warm climates

Fuel Type

Electric

Flow Rate

0.5 GPM

Wattage

3.5KW

Installation Location

Point of Use

Voltage

120-Volt

Dimensions

6 x 11 x 3 Inch

View on Amazon: EcoSmart 120V Point of Use Tankless Water Heater

This EcoSmart unit runs on a standard 120-volt line and draws 3.5 kilowatts. At 6 by 11 by 3 inches and four pounds, it mounts directly under a single sink with standard half-inch NPT connections. You get a 47.8-degree Fahrenheit temperature rise at a 0.5 gallon-per-minute flow rate. It suits you if you need dedicated handwashing hot water in a warm climate without installing a 240-volt electrical circuit.

Pros

• Operates on a 120-volt electrical connection
• Compact 6 x 11 x 3-inch size weighing 4 pounds
• Standard 1/2-inch NPT plumbing connections
• Provides a 47.8°F temperature rise at 0.5 GPM

Cons

• Requires a 30-amp breaker and 10 AWG wire for 0.5 GPM output
• Temperature rise drops to 15.9°F at 1.5 GPM
• Limited to warm climates for single-sink use

Good fit if

• You need hot water for a single sink running at 0.5 GPM in a warm climate.
• You have a 120-volt setup with space for a 30-amp breaker.
• You need a compact 4-pound heater to fit inside a small vanity cabinet.

Skip if

• You live in a colder climate where incoming water requires higher heating capacity.
• You need to supply multiple fixtures simultaneously or exceed 0.5 GPM flow.
• You lack a dedicated 30-amp circuit with 10 AWG wiring.

Verdict: EcoSmart 120V Point of Use Tankless Water Heater provides dedicated single-sink heating on a 120-volt connection in warm regions. Its four-pound footprint fits tight spaces, though low flow limits its scope.

Specifications side by side

The EcoSmart Lineup at a Glance

EcoSmart divides its catalog between point-of-use units and high-capacity tankless heaters. If you need hot water at a single fixture, low-voltage models install directly under sinks without heavy electrical work. The EcoSmart 3.5kW 120V Point-of-Use Tankless Heater serves low-flow sinks on standard 120V connections. If your setup requires stored water instead of instantaneous heating, the EcoSmart 2.5-Gallon Point-of-Use Mini Tank plugs directly into a standard 120-volt outlet.

For higher heating demands, you must choose based on available 240V electrical capacity. The EcoSmart 13 kW Electric Tankless Water Heater matches moderate climates with incoming water near 60 degrees. For homes equipped with 150-amp dedicated electrical capacity, the EcoSmart 36 kW Electric Tankless Water Heater provides 36 kW of output with 99.8 percent efficiency.

Where EcoSmart Water Heaters Fit

EcoSmart suits you if your setup relies strictly on electric power. Heating capacities span from 3.5 kW point-of-use units up to a 36 kW unit. Hardware weights range from 3.85 pounds for small sink heaters up to 18.4 pounds for the ECO 36, plus a 15.8-pound mini-tank. Dimensions scale from 11-by-3-inch boxes to a 21-by-17-inch cabinet.

Notable gaps exist across the range. You will not find gas models, and the lineup skips capacities between 13 kW and 36 kW. You also need specific electrical supply, ranging from 120V outlets to 150-amp service.

Choosing Your EcoSmart Water Heater

1. Check your electrical voltage

   You must match the heater to your home’s electrical system. EcoSmart offers both 120V and 240V models. The 120V units, such as the 3.5kW Point-of-Use Heater, plug into standard outlets, making them easy to install near a single sink. The 240V units, like the 13 kW model, require dedicated circuits and heavier wiring. Using the wrong voltage can damage the unit or prevent it from working. Verify your panel capacity before buying a high-wattage 240V heater to ensure your home can handle the load safely.

2. Define your hot water needs

   Decide if you need hot water for one faucet or multiple fixtures. Point-of-use heaters serve single sinks, while larger tankless units handle whole-home supply. The 2.5-Gallon Mini Tank provides stored hot water for under-sink use, ideal for remote bathrooms. The 13 kW Electric Tankless Heater delivers continuous flow for moderate climates and multiple fixtures. If you only need hot water for handwashing, a small point-of-use unit is sufficient. For whole-home needs, select a higher kilowattage model to maintain temperature during peak usage times.

3. Measure available space

   Tankless heaters are compact, but dimensions vary significantly. The 8 kW Electric Heater measures 8 by 12 by 4 inches and weighs just 4.75 pounds, fitting into tight wall spaces. The 36 kW model is larger at 21 by 17 by 3.6 inches. Measure your installation area carefully to ensure the unit fits. Also consider weight; the 36 kW unit weighs 18.4 pounds and requires sturdy mounting. Smaller units like the 6 kW model weigh only 3.85 pounds, making them easier to handle during installation in confined areas.

4. Evaluate climate conditions

   Incoming water temperature affects heater performance. In warmer climates, lower-kilowattage units can raise water temperature effectively. The 120V Point of Use Heater works well in warm regions for single-sink applications. In colder climates, you need more power to achieve the same output temperature. The 13 kW model is engineered for incoming water near 60 degrees Fahrenheit. If your groundwater is colder, you may need a higher capacity unit like the 36 kW model to maintain consistent hot water temperatures throughout the year.

5. Consider installation complexity

   Installation difficulty depends on the unit type and electrical requirements. Point-of-use models like the 3.5kW unit often plug into existing outlets, simplifying setup. Larger tankless heaters require professional electrical installation due to high amperage demands. The 2.5-Gallon Mini Tank connects to standard plumbing and power, offering a straightforward upgrade for remote fixtures. Always check local codes for electrical and plumbing connections. High-capacity units like the 36 kW model demand significant electrical infrastructure, so consult an electrician to ensure your panel can support the increased load safely.

Frequently asked questions

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