Best Electric Tankless Water Heater for 3 Bathrooms [In 2025]

If you’re in the market for a reliable and efficient electric tankless water heater to meet the hot water demands of a home with three bathrooms, you’ve come to the right place. In this comprehensive review, we’ll explore three top-performing options that can provide endless hot water while optimizing energy usage and space-saving considerations.

Tankless water heaters have become increasingly popular in recent years, offering a more compact and energy-efficient alternative to traditional tank-style models. Unlike their tank counterparts, tankless heaters heat water on-demand, eliminating the need for a large storage tank and providing a continuous supply of hot water. This makes them an ideal choice for homes with multiple bathrooms, where the demand for hot water can be high.

5 Best Electric Tankless Water Heater for 3 Bathrooms Review

18kW Tankless Water Heater Electric, Orbek Instant On Demand Hot Water Heater 240V

Specs:

• Heating Capacity: 18kW
• Flow Rate: Up to 4.17 GPM
• Voltage: 240V
• Dimensions: 17″H x 13.0″L x 3.9″W
• Certifications: ETL Certified

Pros:

• Provides on-demand hot water for 2-3 fixtures simultaneously
• Highly efficient, with potential for up to 60% cost savings compared to tank heaters
• Comprehensive safety features, including leakage protection and over-temperature protection
• Compact size and easy installation
• Stable temperature control within 1°F

Cons:

• Requires 2 x 240V/40A two-pole breakers and 2 sets of 8 AWG wires for installation
• May not be suitable for homes with very high hot water demands

3kW 120V Mini Instant Hot Water Heater Under Sink

Specs:

• Heating Capacity: 3kW
• Flow Rate: Suitable for single point of use
• Voltage: 120V
• Dimensions: Compact under-sink design
• Certifications: IPX4 waterproof

Pros:

• Easy to use with knob control and LED digital display
• Designed with multiple safety protections, including leakage and overheat protection
• Provides instant hot water without the need for preheating
• Compact and versatile design for installation under sinks

Cons:

• Not suitable for high-flow or multiple-use applications
• Requires 120V power supply, which may not be readily available in all homes

Tankless Electric Water Heater 36kW 240V

Specs:

• Heating Capacity: 36kW
• Flow Rate: Up to 8.7 GPM
• Voltage: 240V
• Dimensions: 13.74″W x 21.14″H x 5.31″D
• Certifications: ETL Certified

Pros:

• Provides stable water temperature and adjusts power consumption based on flow and temperature
• Offers energy savings of up to 99% compared to traditional tank heaters
• Compact wall-mounted design saves space compared to tank heaters
• Includes WiFi control for remote temperature adjustments
• Comprehensive safety features and ETL certification

Cons:

• Requires professional installation with 4 x 40A breakers and 4 x 8/2 AWG cables
• Higher upfront cost compared to smaller tankless models

Buying Guide

When selecting the best electric tankless water heater for a home with three bathrooms, there are several key factors to consider:

Heating Capacity

• Look for a model with a high kW rating (typically 18kW or higher) to ensure it can handle the hot water demands of multiple bathrooms
• Consider the maximum flow rate (GPM) to ensure the heater can provide sufficient hot water for concurrent use in the bathrooms

Voltage Requirements

• Most high-capacity tankless electric heaters require a 240V power supply, which may necessitate an electrical panel upgrade
• Ensure the heater’s voltage and amperage requirements match your home’s electrical infrastructure

Space Considerations

• Opt for a compact, wall-mounted design to minimize the footprint and allow for flexible installation locations
• Measure the available space in your home to ensure the heater’s dimensions will fit the desired installation spot

Safety and Efficiency

• Look for models with comprehensive safety features, such as leakage protection and overheat protection, for peace of mind
• Consider the energy efficiency of the heater, as this can translate to significant cost savings on your utility bills

Installation and Warranty

• Determine if professional installation is required and factor in the associated costs
• Look for tankless water heaters that come with a robust warranty, ensuring long-term reliability and protection

FAQs

1. How do tankless water heaters compare to traditional tank-style heaters in terms of energy efficiency?
2. What are the typical flow rate and temperature range capabilities of electric tankless water heaters?
3. How difficult is the installation process for an electric tankless water heater?
4. Can a single tankless water heater serve multiple bathrooms in a home?
5. What safety features are commonly found in high-quality electric tankless water heaters?

Conclusion

Choosing the right electric tankless water heater for a home with three bathrooms requires careful consideration of factors such as heating capacity, voltage requirements, space constraints, and safety/efficiency features. The three models highlighted in this review – the Orbek 18kW, the 3kW mini under-sink heater, and the WINTEMP 36kW – each offer unique advantages that cater to different needs and budgets. By weighing the pros and cons of each option and aligning them with your specific requirements, you can ensure that your home’s hot water demands are met with a reliable, energy-efficient, and hassle-free tankless water heater solution.