Rheem or Electrolux? Tankless Water Heaters Compared in 2026
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When you research rheem vs electrolux tankless water heater options, you find two very different electric solutions. Rheem offers a true tankless unit for whole-house use. Electrolux provides a small point-of-use tank heater. Both rely on electric power. The main difference lies in capacity and installation. Rheem heats water on demand. Electrolux stores a small amount of hot water. Your choice depends on whether you need continuous flow or a single sink boost.
Key differences
| Aspect | Rheem 18kW 240V Electric Tankless Water Heater | Electrolux 1.5 Gal 120V Under Sink Heater |
|---|---|---|
| Type | Tankless | Mini Tank |
| Use | Whole House | Under Sink |
| Voltage | 240 V | 120 V |
| Wattage | 18 kW | not listed |
| Flow Rate | 4.4 GPM | not listed |
| Dimensions | 3.5 x 14.5 x 18.5 inches | 10.1 x 12.3 inches |
Which one should you choose?
Choose Rheem 18kW 240V Electric Tankless Water Heater if
- You need hot water for multiple fixtures simultaneously.
- You have the electrical capacity for a 240V circuit.
- You want a continuous flow of hot water for a whole house.
Choose Electrolux 1.5 Gal 120V Under Sink Heater if
- You only need hot water for a single sink or small area.
- You want a simple plug-in installation without special wiring.
- You have limited space under a sink or in a tight cabinet.
Verdict: Choose the Rheem unit if you require a high-flow, whole-house solution with precise digital temperature control. Select the Electrolux model if you need a compact, easy-to-install booster for a single point of use. These products serve fundamentally different needs within the electric water heating category.
Rheem vs Electrolux Tankless Specs
Power and Voltage
Rheem uses a high-voltage 240V system with 18 kW of power. This setup requires dedicated heavy-duty wiring and a robust electrical panel. Electrolux runs on standard 120V power. It includes a 3.6 ft cord for easy plug-in use. You do not need special wiring or gas lines for the Electrolux. Rheem demands professional installation due to its voltage. Electrolux allows simple DIY setup in minutes. If you have a standard outlet, Electrolux wins. If you have a 240V circuit, Rheem offers more power.
Capacity and Flow
Rheem is a true tankless unit with a flow rate up to 4.4 GPM. It heats water on demand as it flows through. Electrolux is a small 1.5-gallon tank heater. It stores hot water for immediate use. Rheem supports whole-house needs with continuous heating. Electrolux is designed for point-of-use tasks like sinks. You cannot run multiple fixtures simultaneously with Electrolux. Rheem handles higher demand. Electrolux is limited by its small storage volume. Choose Rheem for whole-home flow. Choose Electrolux for single-fixture convenience.
Size and Dimensions
Rheem measures 14.5 x 18.5 x 3.5 inches. It weighs 14.8 pounds. Its slim profile fits wall mounts well. Electrolux measures 10.1 x 12.3 inches. It is compact enough for under-sink cabinets. Rheem is larger but still space-efficient. Electrolux is smaller and lighter. It fits tight spaces easily. Rheem requires more wall space. Electrolux fits under most sinks. If space is tight, Electrolux is better. If you need a wall mount, Rheem works well. Both are designed for efficient space use.
Temperature Control
Rheem features an external digital thermostatic control with an LED display. It offers ±1°F accuracy. This precise control lets you set exact water temperatures. Electrolux data does not list specific temperature control features. It relies on internal components for heating. Rheem allows fine-tuned adjustments. Electrolux likely has standard thermostat settings. If you need precise temperature settings, Rheem is superior. Its digital display provides clear feedback. Electrolux lacks detailed control specs. Rheem wins for precision and visibility.
Installation Requirements
Rheem has bottom 3/4 inch NPT water connections. It is threaded for easy replacement. Installation requires professional electrical work for 240V. Electrolux plugs into standard 120V outlets. It includes a power cord. No special wiring is needed. Electrolux is DIY-friendly. Rheem needs licensed electricians. Electrolux installs in minutes. Rheem takes longer due to wiring. If you want plug-and-play, Electrolux wins. If you have existing 240V infrastructure, Rheem is viable. Electrolux is easier for most homeowners.
Which unit fits your hot water needs
Whole house users needing high flow
You need 4.4 GPM for multiple fixtures. The 18 kW power and 240V supply deliver consistent hot water for a whole home. The compact 3.5-inch depth saves space while providing precise temperature control. This unit handles the demand of daily showers and laundry without waiting for recovery.
Renters wanting easy plug-in setup
You want instant hot water under a sink without electrical upgrades. This 1.5-gallon unit plugs into a standard 120V outlet. The included cord simplifies installation. It is ideal for kitchens or bathrooms where you only need a small amount of hot water for hand washing or dish rinsing.
Budget-conscious DIY installers
You prefer a straightforward installation process. This model requires no special wiring or gas lines. You simply plug it into a standard wall outlet. The compact size fits easily in tight spaces under sinks. It provides reliable hot water for point-of-use applications without complex professional installation requirements.
The products compared
Rheem 18kW 240V Electric Tankless Water Heater
Best for: Whole-home electric heating needs
- Fuel Type
- Electric
- Flow Rate
- 4.4 GPM
- Wattage
- 18 kW
- Voltage
- 240 V
- Temperature Control
- ±1°F
- Dimensions
- 3.5 x 14.5 x 18.5 inches
View on Amazon: Rheem 18kW 240V Electric Tankless Water Heater Affiliate link
This Rheem unit delivers up to 4.4 GPM at 18 kW. It features a slim 3.5-inch depth and external digital controls with ±1°F accuracy. The copper immersion elements are field-serviceable. You get precise temperature management for whole-home use. It suits households needing reliable electric heating without complex installation.
Pros
- High 18 kW output for whole-home use
- Slim 3.5-inch profile saves wall space
- Precise ±1°F digital temperature control
- Field-serviceable copper heating elements
Cons
- Requires 240V dedicated circuit
- No smart connectivity features listed
- Heavier than point-of-use models
Good fit if
- You need a whole-home solution
- You have a 240V electrical setup
- You want precise temperature control
Skip if
- You only have 120V outlets
- You need smart home integration
- You want a point-of-use unit
Verdict: Rheem 18kW Whole Home Electric Heater offers robust 4.4 GPM flow and precise control. It fits homes with 240V power seeking reliable whole-house heating.
Electrolux 1.5 Gal 120V Under Sink Heater
Best for: single sink hot water needs
- Fuel Type
- Electric
- Capacity
- 1.5 Gallon
- Voltage
- 120V
- Certification
- CSA
- Dimensions
- 10.1 x 12.3 in
- Use
- RV, Under Sink
View on Amazon: Electrolux 1.5 Gal 120V Under Sink Heater Affiliate link
This Electrolux mini tank provides 1.5 gallons of hot water at 120 volts. It plugs into standard outlets, making installation simple without special wiring. The compact 10.1 by 12.3 inch design fits under most sinks. It includes overheat protection and a CSA certification. You get a 6-year tank warranty and 2-year electrical warranty. This unit suits small spaces where full-size heaters do not fit.
Pros
- 120V plug-in installation requires no special wiring
- Compact 10.1 x 12.3 inch dimensions fit under sinks
- CSA certified with overheat protection
- 6-year tank warranty included
Cons
- Small 1.5-gallon capacity limits simultaneous use
- 120V voltage provides slower recovery than 240V units
- Limited to point-of-use applications only
Good fit if
- You need hot water for a single sink
- You want a plug-in unit for easy DIY setup
- You have limited space under the counter
Skip if
- You require high flow rates for showers
- You need to heat water for multiple fixtures
- You prefer a tankless unit with no storage
Verdict: Electrolux 1.5 Gal 120V Under Sink Heater is a practical solution for single-sink applications where space and simple installation matter most.
Specifications side by side
| Spec | Rheem 18kW 240V Electric Tankless Water Heater | Electrolux 1.5 Gal 120V Under Sink Heater |
|---|---|---|
| Fuel Type | Electric | Electric |
| Flow Rate | 4.4 GPM | not stated |
| Wattage | 18 kW | not stated |
| Capacity | not stated | 1.5 Gallon |
| Voltage | 240 V | 120V |
| Temperature Control | ±1°F | not stated |
| Certification | not stated | CSA |
| Dimensions | 3.5 x 14.5 x 18.5 inches | 10.1 x 12.3 in |
| Use | Whole House | RV, Under Sink |
| Weight | 14.8 pounds | not stated |
| Size | Small | not stated |
| Color | Gray | 1.5 Gallon |
| Model | RTEX-18 | EES015 |
Frequently asked questions
Is Rheem a better brand than Electrolux for whole-home hot water?
Rheem is the better choice for whole-home needs. Its 18kW model delivers up to 4.4 GPM flow, which supports multiple fixtures simultaneously. Electrolux offers a 1.5-gallon unit designed only for single-sink applications. If you need consistent hot water for showers and appliances, Rheem provides the necessary capacity and power.
Can I plug the Electrolux heater into a standard outlet?
Yes, the Electrolux 1.5-gallon unit runs on standard 120V power. It includes a 3.6-foot cord for easy plug-in installation. This makes it ideal for under-sink use where dedicated high-voltage wiring is not available. You do not need an electrician for basic setup if you have a nearby standard outlet.
Does Rheem require special electrical wiring?
Yes, the Rheem 18kW model requires a 240V power supply. This setup needs dedicated heavy-duty wiring and a robust electrical panel. It is not a plug-in unit like smaller under-sink heaters. You must ensure your home’s electrical system can handle the 18 kW load before installation.
Which heater is smaller and easier to install?
The Electrolux 1.5-gallon unit is more compact for point-of-use installation. It measures 10.1 inches wide and 12.3 inches high. The Rheem model is also slim at 3.5 inches deep but requires more complex electrical work. For simple under-sink placement, the Electrolux design fits standard cabinetry easily.
What is the difference between tankless and tank-style under-sink heaters?
The Rheem unit is a true tankless heater for whole-home use. It heats water instantly as it flows through. The Electrolux model is a small 1.5-gallon tank heater. It stores a limited amount of hot water for single-sink use. Choose Rheem for continuous flow and Electrolux for small, localized needs.
Can the Electrolux heater supply hot water for a shower?
No, the Electrolux 1.5-gallon unit is designed for single-sink applications. Its small capacity and 120V power are insufficient for shower demands. For bathroom showers, you need the Rheem 18kW model. It provides high flow rates and consistent temperature for whole-home hot water needs.
How much space does the Rheem heater take up?
The Rheem 18kW unit is compact and wall-mountable. It measures 14.5 inches wide and 18.5 inches long. The depth is only 3.5 inches, saving valuable space. It weighs 14.8 pounds, making it easy to mount securely. This small footprint allows installation in utility rooms or closets without taking up floor space.