EcoSmart ECO 11 Electric Tankless Water Heater vs EcoSmart POU 4T 3.5kW 120v (2026): Key Differences
As an Amazon Associate we earn from qualifying purchases. Links on this page are affiliate links.
The ecosmart eco 11 electric tankless water heater vs pou 4t 3 5kw 120v comparison highlights two distinct electric water heating solutions from the same brand. Both units operate on electricity and provide on-demand hot water without a storage tank. The primary difference lies in their power output and intended application. The ECO 11 delivers higher capacity for general household use, while the POU 4T is designed specifically for point-of-use installations with lower flow requirements.
Key differences
| Aspect | EcoSmart 13 kW Electric Tankless Water Heater | EcoSmart 3.5kW 120V Point-of-Use Tankless Heater |
|---|---|---|
| Voltage | 240 V | 120 V |
| Wattage | 13 kW | 3.5 kW |
| Installation Location | not listed | Point of Use |
| Dimensions | 10 x 13.5 x 6.5 inches | 11 x 11 x 7 inches |
| Weight | 6.5 pounds | 4 pounds |
Which one should you choose?
Choose EcoSmart 13 kW Electric Tankless Water Heater if
- You need higher hot water output for a kitchen or bathroom sink.
- Your electrical panel supports a 240-volt circuit.
- You want a compact unit that can handle moderate flow rates.
Choose EcoSmart 3.5kW 120V Point-of-Use Tankless Heater if
- You are installing a heater directly under a sink or counter.
- You only have a standard 120-volt outlet available.
- You need a lightweight unit for easy mounting in tight spaces.
Verdict: Choose the ECO 11 if you require more power and have the necessary 240-volt wiring for a dedicated circuit. Select the POU 4T if you need a simple plug-in solution for a single faucet or low-flow application. Both models save space compared to traditional tanks, but they serve different electrical and usage needs.
ECO 11 vs POU 4T Specs
Voltage and wiring
The EcoSmart ECO 11 operates on 240 volts, requiring a dedicated double-pole circuit breaker and thicker gauge wiring. This is standard for whole-house or multi-fixture applications. The EcoSmart POU 4T runs on 120 volts, allowing it to plug into a standard household outlet in many cases. This lower voltage requirement simplifies installation for single sinks or small spaces. You must check your home’s electrical panel capacity before choosing the ECO 11, as it draws significantly more power. The POU 4T offers greater flexibility for older homes or locations without 240-volt circuits.
Heating power
Power output determines how much hot water you can get simultaneously. The ECO 11 delivers 13 kW of heating power. This higher wattage supports higher flow rates and can handle multiple fixtures in warmer climates. The POU 4T provides 3.5 kW of power. This lower output is designed for point-of-use scenarios, such as a single bathroom sink or kitchen faucet. It heats water efficiently for low-demand tasks but cannot keep up with high-flow showers or tubs. If you need substantial heat for a primary bathroom, the ECO 11 is the stronger choice.
Physical size
Dimensions affect where you can mount the unit. The ECO 11 measures 10 inches high, 13.5 inches wide, and 6.5 inches deep. It weighs 6.5 pounds. The POU 4T is slightly taller at 11 inches high, with a width and length of 11 inches, and weighs just 4 pounds. Both units are compact compared to tank heaters. The POU 4T’s square footprint may fit better in tight under-sink cabinets. The ECO 11’s narrower width might slide into tighter vertical spaces. Both are lightweight enough for standard wall mounting without heavy-duty brackets.
Intended use
These heaters serve different roles in your home. The ECO 11 is configured for climates with incoming water temperatures around 60 degrees Fahrenheit. It is suitable for whole-house use or supplying multiple fixtures in mild weather. The POU 4T is explicitly labeled as a Point of Use unit. It is designed for low-flow applications and single fixtures. It saves space by being 90% smaller than a traditional tank. You should install the POU 4T close to the faucet to minimize heat loss in the pipes. The ECO 11 is built for higher demand.
Installation location
Location impacts efficiency and convenience. The POU 4T is designed for point-of-use installation, meaning it sits right next to the sink or tap. This reduces the distance hot water travels, saving energy and time. The ECO 11 is typically installed at the main water entry point or near a central bathroom. Its higher capacity allows it to serve more distant fixtures. If you need hot water for a remote cabinetry or an outbuilding, the POU 4T’s proximity to the source is a key advantage. For central home distribution, the ECO 11’s placement is more practical.
Which tankless heater fits your needs
Whole-house or multi-fixture user
You need higher output for multiple taps. The ECO 11 delivers 13 kW at 240 volts. This power level handles whole-house demands better than lower wattage units. It requires a dedicated double-pole circuit and thicker wiring. Choose this if you prioritize flow rate over compact size.
Small sink or low-flow install
You want a compact unit for a single sink. The POU 4T offers 3.5 kW at 120 volts. It fits standard outlets and needs less electrical infrastructure. Its small footprint saves space under counters. This model is ideal for point-of-use applications where high flow is not required.
Renter or easy wiring setup
You prefer standard home wiring without upgrades. The POU 4T runs on 120 volts, matching common household circuits. It avoids the need for expensive 240-volt breaker panels. The lighter weight and smaller dimensions make installation simpler. This option reduces electrical complexity for basic hot water needs.
The products compared
EcoSmart 13 kW Electric Tankless Water Heater
Best for: Compact 240V single-sink installations in moderate climates
- 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 Affiliate link
The EcoSmart ECO 11 is a 13 kW electric tankless water heater designed for 240-volt circuits. It uses self-modulating technology to adjust energy use based on demand. The unit measures 10 x 13.5 x 6.5 inches and weighs 6.5 pounds. It is configured for climates with incoming water temperatures around 60 degrees Fahrenheit. This model suits you if you need a compact, efficient solution for a single sink or small application.
Pros
- 13 kW heating capacity for efficient hot water delivery
- Compact dimensions of 10 x 13.5 x 6.5 inches
- Lightweight design at only 6.5 pounds
- Patented self-modulating technology adjusts power automatically
Cons
- Requires a 240-volt electrical circuit, limiting installation locations
- Optimized for moderate climates with 60-degree incoming water
- Lacks included mounting hardware in the provided data
Good fit if
- You have a 240-volt outlet available near the installation site
- You need a compact unit for a single sink or small application
- You live in a region with moderate winter water temperatures
Skip if
- You only have 120-volt outlets available for installation
- You live in a very cold climate with low incoming water temperatures
- You need a high-flow unit for multiple simultaneous fixtures
Verdict: EcoSmart ECO 11 13kW Electric Heater is a space-saving option for users with 240-volt access in moderate climates. It delivers reliable performance for single-point applications where compact size and energy efficiency are priorities.
EcoSmart 3.5kW 120V Point-of-Use Tankless Heater
Best for: Single sink hot water supply
- 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 Affiliate link
This unit is a 3.5kW electric water heater designed for point-of-use applications. It runs on 120V power and measures 11 x 11 x 7 inches. The compact size makes it 90% smaller than traditional tanks. You get consistent hot water on demand. It fits well in small spaces where standard heaters cannot go.
Pros
- 3.5kW heating capacity
- 120V electrical connection
- Compact 11 x 11 x 7 inch design
- Saves 90% space compared to tanks
Cons
- Lower 3.5kW output compared to 13KW main models
- Limited to point-of-use installation
- Requires 120V circuit which may need dedicated wiring
Good fit if
- You need hot water for a single sink
- You have limited space for installation
- You want to save energy by heating only when used
Skip if
- You need to heat water for multiple fixtures simultaneously
- You only have a 240V electrical supply
- You require high flow rates for showers
Verdict: EcoSmart POU 4T 120V Point of Use is a compact solution for single-fixture hot water needs. It suits you if you need a small, energy-efficient heater for a sink or small application.
Specifications side by side
| Spec | EcoSmart 13 kW Electric Tankless Water Heater | EcoSmart 3.5kW 120V Point-of-Use Tankless Heater |
|---|---|---|
| Fuel Type | Electric | Electric |
| Wattage | 13 kW | 3.5kW |
| Installation Location | not stated | Point of Use |
| Voltage | 240 V | 120v |
| Dimensions | 10 x 13.5 x 6.5 inches | 11 x 11 x 7 inches |
| Weight | 6.5 pounds | 4 pounds |
| Size | 12 x 8 x 4 | not stated |
| Color | color | White |
| Model | ECO 11 | POU 4T |
Frequently asked questions
Can the EcoSmart ECO 11 replace a traditional tank water heater?
It depends on your household size and climate. The ECO 11 delivers 13 kW of power at 240 volts, making it suitable for single-sink or moderate climate applications. It is not designed for whole-house demands in cold regions. You should verify your electrical capacity before installation to ensure it meets the 240-volt requirement.
Is the POU 4T suitable for a shower?
No, the POU 4T is not recommended for showers. It is a 3.5 kW unit designed specifically for point-of-use applications like a single sink. Its 120-volt input limits its heating capacity. For a shower, you typically need higher wattage and voltage to maintain adequate water temperature during flow.
Do I need a special breaker for the ECO 11?
Yes, the ECO 11 requires a dedicated double-pole circuit breaker. Because it operates on 240 volts with 13 kW of power, it draws significant current. Standard 120-volt outlets cannot support this unit. You must have thicker gauge wiring installed by a qualified electrician to handle the load safely.
How much space does the POU 4T take up?
The POU 4T is very compact, measuring 11 inches in width, 7 inches in height, and 11 inches in length. It weighs only 4 pounds, making it easy to mount under a sink or in a small cabinet. Its small footprint is ideal for tight spaces where a traditional tank would not fit.
Can I use the ECO 11 in a garage?
The ECO 11 is designed for moderate climates. If your garage experiences freezing temperatures, you may need to take additional precautions. The unit is 12 x 8 x 4 inches and weighs 6.5 pounds. Ensure the installation area is protected from extreme cold to prevent damage to the internal components during winter months.
What is the difference in voltage between these two models?
The ECO 11 uses 240 volts, while the POU 4T uses 120 volts. This voltage difference dictates their power output and installation requirements. The 240-volt ECO 11 provides 13 kW of heat, whereas the 120-volt POU 4T provides 3.5 kW. You must match the unit to your home’s available electrical circuit.
Is the POU 4T energy efficient?
Yes, the POU 4T is energy efficient for its intended use. As a point-of-use heater, it heats water only when needed, eliminating standby heat loss. It is designed for single-sink applications, reducing the energy required to keep a large tank of water hot. This makes it a practical choice for small, isolated water needs.