EcoSmart ECO 11 Electric Tankless Water Heater Alternatives: 6 Similar Picks Compared
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If you are researching ecosmart eco 11 electric tankless water heater alternatives, several competing models offer comparable heating for your home. The EcoSmart ECO 11 operates on 240 volts and draws 13 kW of power inside a compact 6.5-pound chassis measuring 10 by 13.5 by 6.5 inches. It is configured specifically for moderate climates where incoming water temperatures remain near 60 degrees.
You might seek a different option if you want higher output, an alternative brand, a distinct physical size, or added features such as Wi-Fi control. For instance, homes running multiple simultaneous fixtures may require 18 kW, 24 kW, or 27 kW units with heavier electrical service requirements. The 6 alternatives in this guide were chosen because their specs overlap directly with the original unit, giving you practical options across different power levels and capacities.
Our top pick: EcoSmart 13 kW Electric Tankless Water Heater.
EcoSmart ECO 11 Alternatives Compared
Ranein 13 kW Tankless Water Heater
EcoSmart draws 13 kW on 240 volts in a 6.5-pound shell measuring 13.5 inches wide and 6.5 inches deep. The Ranein RE13K also provides 13 kW at 240 volts, but it specifies a flow rating of up to 3.1 GPM and 1°F digital temperature adjustments on a single 60A circuit. In exchange for precise digital control, you take on more bulk. Ranein weighs 8.38 pounds and measures 11.2 inches wide, 12.9 inches high, and 11.2 inches deep, making it significantly deeper than the original. You should pick the Ranein if you want exact 1-degree temperature increments for up to two fixtures and have cabinet depth to fit an 11.2-inch chassis.
Like the original EcoSmart unit, the NOVIEEX DS-18 operates at 240 volts and draws 13 kW of power. NOVIEEX stands out by delivering up to 3.6 GPM alongside 1°F digital temperature adjustments on a single 60A breaker. What you give up is compact wall clearance. At 15.9 inches high, 11.1 inches wide, and 11.1 inches deep, it stands nearly six inches taller and over four inches deeper than the 10-by-13.5-by-6.5-inch EcoSmart casing. You should choose the NOVIEEX if you manage an apartment setup needing up to 3.6 GPM across one or two fixtures simultaneously, provided your indoor mounting space accommodates its taller profile.
The VancEpic RE13K matches the EcoSmart with a 13 kW rating at 240 volts on a 60-amp circuit. Its main advantage is physical footprint and element isolation. Measuring 7.8 inches wide, 10.9 inches high, and 7.8 inches deep, the VancEpic cuts nearly six inches off the EcoSmart’s 13.5-inch width, and its heating elements remain isolated from water. It gives up the EcoSmart's slim 6.5-inch depth, protruding 1.3 inches farther out from the wall at 7.8 inches, while weighing slightly more at 6.6 pounds. Select the VancEpic if you need a narrow point-of-use heater for a small multi-point setup where horizontal wall space is limited.
Both the LiberLive RE13K and the EcoSmart ECO 11 run on 240 volts and draw 13 kW. LiberLive improves on overall weight and horizontal width, coming in at 5 pounds and 7.9 inches wide compared to the EcoSmart’s 6.5 pounds and 13.5-inch width. It also offers digital control in a compact frame. However, you give up some wall clearance depth, as the LiberLive measures 7.9 inches deep versus the EcoSmart's 6.5 inches. You should pick the LiberLive if you require the lightest 13 kW unit available for one or two point-of-use fixtures where narrow horizontal clearance matters more than wall depth.
Senville matches the EcoSmart’s electrical specs with 13 kW power at 240 volts and includes self-modulating heating technology. Its key specification advantage is a documented 5-year manufacturer replacement warranty for long-term coverage. What you give up is the lightweight design of the EcoSmart. At 10.2 pounds, the Senville unit adds over 3.5 pounds of extra weight over the 6.5-pound EcoSmart, and Senville does not provide specific exterior casing dimensions or incoming temperature climate recommendations. You should pick the Senville if you want a self-modulating 240V water heater for an apartment or condo with the protection of a 5-year replacement warranty.
The MRNIU Mrniu13 shares the same electrical profile as the EcoSmart, drawing 13 kW at 240 volts. In dimensions, the MRNIU is narrower at 8.6 inches wide compared to the 13.5-inch width of the EcoSmart. However, it gives up several features found on the original. It weighs 8.16 pounds versus 6.5 pounds, measures 13.2 inches high and 8.6 inches deep, and does not provide a visible digital display or a published flow-rate specification. You should choose the MRNIU if you need a narrow 240V wall-mounted heater for a compact spot where horizontal width is restricted and a digital interface is not required.
Quick picks
Our 7 picks
EcoSmart 13 kW Electric Tankless Water Heater
Best for: moderate climates with 60-degree incoming water
- 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
The EcoSmart 13kW Electric Tankless Water Heater is an on-demand unit rated for 240-volt electrical systems. It provides 13 kW of heating power and features self-modulating technology to manage electrical draw. The compact frame measures 10 by 13.5 by 6.5 inches and weighs 6.5 pounds. This unit suits you if you live in moderate climates where incoming groundwater temperatures stay around 60 degrees.
Pros
- Draws 13 kW on a 240-volt electrical supply
- Uses patented self-modulating heating technology
- Compact casing measuring 10 by 13.5 by 6.5 inches
- Lightweight build at 6.5 pounds
Cons
- Configured for climates with incoming water around 60 degrees
- No remote control listed in the specifications
Good fit if
- You have a 240-volt setup available to support a 13 kW demand.
- You reside in a climate with incoming groundwater temperatures near 60 degrees.
- You need a compact unit weighing under 7 pounds for small wall spaces.
Skip if
- You live in cold regions where incoming water drops significantly below 60 degrees.
- You cannot support a 240V electric water heater in your service panel.
Verdict: EcoSmart 13kW Electric Tankless Water Heater provides steady electric heating in a compact 6.5-pound chassis. It delivers optimal output if your home receives incoming water near 60 degrees.
Thermomate 18kW Electric Tankless Water Heater
Best for: medium homes needing up to 4.4 GPM
- Fuel Type
- Electric
- Flow Rate
- Up to 4.4 GPM
- Wattage
- 18kW
- Voltage
- 208~240 Volt
- Temperature Control
- 80°F to 140°F, 1° increment
- Certification
- ETL
View on Amazon: Thermomate 18kW Electric Tankless Water Heater
This Thermomate unit is an 18kW indoor electric tankless water heater running on 240 volts. It provides a flow rate up to 4.4 GPM and lets you adjust water temperature between 80°F and 140°F in single-degree steps. It suits you if you need higher output than standard 11kW heaters and have capacity for two 40-amp double-pole breakers.
Pros
- Delivers up to 4.4 GPM flow rate
- Digital temperature adjustments in 1° increments from 80°F to 140°F
- Heating element separated from water tube to reduce mineral scale
- Standard 3/4-inch NPT plumbing fittings
Cons
- Requires high electrical capacity with two double-pole 40-amp breakers
- Does not include Wi-Fi connectivity or app monitoring
Good fit if
- You need up to 4.4 GPM flow rate for your fixtures
- You have electrical panel space for two double-pole 40-amp breakers
- You want precise temperature control down to the single degree
Skip if
- You cannot accommodate an 80-amp total electrical draw
- You want remote control or Wi-Fi support
Verdict: Thermomate 18kW Electric Tankless Water Heater provides up to 4.4 GPM for households that require more heating capacity than entry-level 11kW units. It serves users who already have the required 80-amp electrical breaker capacity.
SIVUATEK 27kW Electric Tankless Water Heater
Best for: homes running multiple fixtures simultaneously
- Fuel Type
- Electric
- Wattage
- 27kW
- Voltage
- 240V
- Temperature Control
- 86°F to 131°F, 1°F increments
- Dimensions
- 15.87 x 11.14 x 2.87 in
- Use
- Whole House
View on Amazon: SIVUATEK 27kW Electric Tankless Water Heater
This SIVUATEK 27kW unit is a high-capacity 240V electric tankless water heater designed for whole-house use. It supports four to five simultaneous fixtures, delivering water heated between 86°F and 131°F via an LED display. If you need significantly more output than an 11kW model and have the electrical capacity for three 40-amp breakers, it fits your home well.
Pros
- 27kW heating capacity supports 4 to 5 simultaneous fixtures
- Adjustable temperature range from 86°F to 131°F in 1°F increments
- Up to 99.8% thermal efficiency
- Standard 3/4-inch NPT water connections
Cons
- Requires three separate 40-amp circuit breakers
- Maximum temperature output is limited to 131°F
- Does not include remote or mobile app controls
Good fit if
- You need to supply hot water to 4 or 5 fixtures at the same time.
- You have an electrical panel that can supply three 40-amp breakers.
- You want single-degree temperature adjustments on an LED interface.
Skip if
- You cannot dedicate three 40-amp breakers to water heating.
- You only need point-of-use heating for a single sink or low-flow fixture.
Verdict: SIVUATEK 27kW Electric Tankless Water Heater provides high-volume output for homes with the electrical capacity to handle three 40-amp breakers. It serves households running multiple bathrooms and appliances simultaneously.
Orbek 18kW 240V Tankless Electric Water Heater
Best for: Homes supporting 2 to 3 simultaneous fixtures
- Fuel Type
- Electric
- Wattage
- 18 kW
- Installation Location
- Wall-mounted
- Voltage
- 240 V
- Certification
- ETL
- Dimensions
- 17 x 13 x 3.9 in
View on Amazon: Orbek 18kW 240V Tankless Electric Water Heater
The Orbek 18kW Electric Tankless Water Heater delivers on-demand hot water reaching up to 140°F for two to three simultaneous fixtures. Drawing up to 75 amps across two 40-amp double-pole breakers, it steps up output over base 11kW models. If your home has the panel capacity for dual breakers, you get 3/4-inch NPT connections and ETL-certified operation in a wall-mounted profile.
Pros
- 18 kW heating power supports 2 to 3 points of use
- Standard 3/4-inch NPT water connections
- Heats water up to 140°F on demand
- ETL certified with leakage, dry-fire, and overheat protection
Cons
- Requires two 40-amp double-pole breakers and 75-amp panel capacity
- Lacks Wi-Fi integration or mobile app controls
Good fit if
- You need to supply hot water to 2 or 3 fixtures at the same time.
- You have panel capacity for two 40-amp double-pole breakers and 8/2 AWG wiring.
- You prefer standard 3/4-inch NPT plumbing fittings.
Skip if
- You only have panel space for a single breaker connection.
- You want Wi-Fi connectivity or app monitoring.
Verdict: Orbek 18kW 240V Electric Tankless Water Heater delivers higher multi-fixture capacity than 11kW units if your breaker panel can accommodate its 75-amp electrical draw.
Ranein 13 kW Tankless Water Heater
Best for: precise point-of-use heating up to two fixtures
- Fuel Type
- Electric
- Flow Rate
- 3.1 GPM
- Wattage
- 13 kW
- Voltage
- 240 V
- Temperature Control
- 86°F to 131°F, 1°F increments
- Dimensions
- 10.7 x 7.9 x 2.8 inches
This Ranein 13kW electric tankless water heater delivers up to 3.1 GPM on a 240V circuit, making it a direct alternative to the EcoSmart ECO 11. It requires a single 60A breaker and standard 1/2-inch NPT plumbing fittings. You can adjust water output between 86°F and 131°F in single-degree increments using the rotary knob and LED screen. It suits small apartments or point-of-use setups running one or two fixtures simultaneously.
Pros
- Delivers up to 3.1 GPM flow rate
- Adjustable from 86°F to 131°F in precise 1°F increments
- Wiring connects without needing to remove the outer housing
- Heating elements are separated from direct water flow
Cons
- Requires a dedicated 60A breaker on a 240V electrical service
- Caps maximum temperature at 131°F
Good fit if
- You have an electrical panel that supports a dedicated 240V, 60A breaker.
- You need point-of-use hot water for one to two simultaneous fixtures.
- You want precise 1°F temperature adjustments via a digital display and control knob.
Skip if
- You need hot water output temperatures higher than 131°F.
- You do not have 60 amps of available breaker space on a 240V line.
Verdict: Ranein 13kW Electric Tankless Water Heater delivers up to 3.1 GPM with 1°F digital temperature adjustments on a single 60A circuit. It is a practical point-of-use unit for one or two fixtures in tight spaces.
SIVUATEK 24 kW Point-of-Use Tankless Water Heater
Best for: point-of-use installations with heavy electrical service capacity
- Fuel Type
- Electric
- Wattage
- 24kW
- Installation Location
- Point of use
- Voltage
- 240V
- Certification
- ETL
- Dimensions
- 17.3 x 12.2 x 12.2 inches
View on Amazon: SIVUATEK 24 kW Point-of-Use Tankless Water Heater
This SIVUATEK unit delivers 24 kW of electric heating at 240 volts for dedicated point-of-use setups. It features self-modulating power adjustment based on flow rate and water temperature, along with separated water and electric chambers. If you need significantly higher heating capacity than an 11 kW heater and have adequate panel capacity, this system suits your installation.
Pros
- 24 kW heating system provides rapid point-of-use water heating
- Self-modulating technology adjusts power draw based on real-time flow rate
- Separated water and electrical chambers reduce scale deposits and corrosion risk
- Uses standard 3/4-inch NPT pipe fittings
Cons
- Demands three 40A double-pole breakers and three 8 AWG wiring runs
- Deep 12.2-inch depth requires more clearance than slim alternatives
- Specifications do not mention a digital display or remote control
Good fit if
- You have electrical panel capacity for three 40A double-pole breakers.
- You need 24 kW of output to deliver water above 120°F rapidly.
- You prefer separated internal fluid and electrical lines to minimize scale.
Skip if
- You have an electrical service panel that cannot support a 120A total draw.
- You require a slim profile unit for shallow cabinet or wall mounting.
Verdict: SIVUATEK 24kW Electric Tankless Water Heater fits homeowners who require high point-of-use output and have the heavy electrical service needed to support three dedicated 40-amp circuits.
Westinghouse 11 kW Smart Wi-Fi Tankless Water Heater
Best for: single-fixture smart homes and small apartments
- Fuel Type
- Electric
- Flow Rate
- 2.6 GPM
- Wattage
- 11 kW
- Voltage
- 240V
- Certification
- ETL
- Dimensions
- 12.6" x 9.56" x 9.56"
View on Amazon: Westinghouse 11 kW Smart Wi-Fi Tankless Water Heater
This 11 kW, 240V electric tankless water heater runs on a single 60A double-pole breaker and 8 AWG wiring. It supplies up to 2.6 GPM when heating water from 62°F to 105°F. You get built-in Wi-Fi for Alexa and Google Home control. It suits you if you need dedicated hot water for a single shower or sink.
Pros
- Wi-Fi connectivity with Alexa and Google Home voice control
- Provides 2.6 GPM flow at 62°F inlet and 105°F outlet
- Requires only one 60A double-pole breaker and 8 AWG wire
- Separated water and electricity pathways with IPX4 moisture rating
Cons
- 11 kW capacity limits output to a single fixture at a time
- Requires a minimum start-up flow rate of 0.53 GPM
Good fit if
- You want smart app and voice control for water temperature settings.
- You have a 60A double-pole 240V breaker available on your electrical panel.
- You need point-of-use hot water for a single shower or sink.
Skip if
- You need to run multiple high-demand fixtures at the same time.
- You live in a region with very cold groundwater requiring more heating power than 11 kW.
Verdict: Westinghouse 11kW Smart Electric Tankless Water Heater delivers focused point-of-use output with app and voice control for a single bathroom or sink.
Specifications side by side
| Spec | EcoSmart 13 kW Electric Tankless Water Heater | Thermomate 18kW Electric Tankless Water Heater | SIVUATEK 27kW Electric Tankless Water Heater | Orbek 18kW 240V Tankless Electric Water Heater | Ranein 13 kW Tankless Water Heater | SIVUATEK 24 kW Point-of-Use Tankless Water Heater | Westinghouse 11 kW Smart Wi-Fi Tankless Water Heater |
|---|---|---|---|---|---|---|---|
| Fuel Type | Electric | Electric | Electric | Electric | Electric | Electric | Electric |
| Flow Rate | not specified | Up to 4.4 GPM | not specified | not specified | 3.1 GPM | not specified | 2.6 GPM |
| Wattage | 13 kW | 18kW | 27kW | 18 kW | 13 kW | 24kW | 11 kW |
| Installation Location | not specified | not specified | not specified | Wall-mounted | not specified | Point of use | not specified |
| Voltage | 240 V | 208~240 Volt | 240V | 240 V | 240 V | 240V | 240V |
| Temperature Control | not specified | 80°F to 140°F, 1° increment | 86°F to 131°F, 1°F increments | not specified | 86°F to 131°F, 1°F increments | not specified | not specified |
| Certification | not specified | ETL | not specified | ETL | not specified | ETL | ETL |
| Dimensions | 10 x 13.5 x 6.5 inches | 17.12" x 13.12" x 3.12" | 15.87 x 11.14 x 2.87 in | 17 x 13 x 3.9 in | 10.7 x 7.9 x 2.8 inches | 17.3 x 12.2 x 12.2 inches | 12.6" x 9.56" x 9.56" |
| Use | not specified | not specified | Whole House | Whole House | not specified | not specified | not specified |
| Features | not specified | not specified | not specified | not specified | not specified | not specified | WiFi |
| Weight | 6.5 pounds | not specified | not specified | not specified | 8.38 pounds | 20 pounds | not specified |
| Size | 12 x 8 x 4 | 18kW | not specified | M-18 | not specified | L-24 | S-11 |
| Color | color | Gray | Gray | Snow | Gray | Black | Gray |
| Model | ECO 11 | ET180 | TSB-270 | HEU-ET018A5W-M0 | RE13K (13kW) | V7B-240B | WET011A0G |
If you also heat outdoor spaces, you can evaluate the best electric patio heaters by power requirements and coverage.
Frequently asked questions
Which EcoSmart ECO 11 alternative includes smart wireless controls?
The Westinghouse 11 kW Smart Wi-Fi model features app and voice controls. Like standard 11 kW heaters, it operates on a 240V supply. This unit suits single-fixture setups, such as a dedicated sink or small apartment bathroom, where remote adjustments are helpful.
What electrical supply do you need to step up from 11 kW to an 18 kW alternative?
Moving up to an 18 kW heater requires a substantially larger electrical setup. For instance, the Thermomate 18 kW requires an 80-amp breaker capacity, while the Orbek 18 kW pulls a 75-amp draw. Both operate on 240 volts and support multiple fixtures simultaneously.
Can any alternatives handle whole-house water heating across multiple bathrooms?
Yes, higher-wattage alternatives can serve whole-house demands. The SIVUATEK 27 kW unit is rated for whole-house use and runs multiple fixtures at once. It requires three dedicated 40-amp breakers on a 240-volt system to supply enough power for larger household demands.
What breaker size does a 13 kW alternative like the Ranein require?
The Ranein 13 kW unit runs on a single 60-amp circuit at 240 volts. This matches point-of-use requirements while delivering up to 3.1 GPM. It allows 1°F digital temperature adjustments, making it a direct electrical fit for moderate household setups.
How many fixtures can an 18 kW alternative run at the same time?
An 18 kW model such as the Orbek can support between two and three simultaneous fixtures. If your household demands higher volume, units like the Thermomate 18 kW provide flow rates reaching up to 4.4 GPM, provided your panel supports an 80-amp breaker.
What electrical capacity does the SIVUATEK 24 kW heater require?
The SIVUATEK 24 kW unit requires heavy electrical service featuring three dedicated 40-amp circuits at 240 volts. Weighing 20 pounds, this high-output point-of-use heater delivers higher capacity than standard 11 kW options for installations that already have significant panel capacity.