5 Best Tankless Water Heaters for 3 Bathrooms [In 2025]

When it comes to efficient and reliable hot water supply for your home, tankless water heaters have emerged as the preferred choice for many homeowners. With their compact size, energy-saving capabilities, and on-demand hot water delivery, these innovative appliances have revolutionized the way we approach our daily hot water needs. In this comprehensive review, we’ll explore some of the top tankless water heater options that are well-suited for homes with three bathrooms.

5 Best Tankless Water Heaters for 3 Bathrooms Review

FOGATTI 14kW Tankless Water Heater Electric

Overview

The FOGATTI 14kW Tankless Water Heater Electric is a powerful and efficient on-demand hot water solution designed to serve up to 3 points of use simultaneously. Its compact and space-saving design makes it an ideal choice for homes with limited space, while its robust construction and safety certifications ensure reliable performance and peace of mind.

Specs

• Maximum Flow Rate: 3.3 GPM
• Voltage: 240V
• Heating Capacity: 14kW
• Dimensions: 14.2″ x 9.5″ x 3.5″
• Safety Certifications: ETL

Pros

• Provides continuous hot water for up to 3 points of use simultaneously
• Compact and space-saving design for easy installation
• Intuitive temperature controls and easy-to-read LED display
• Undergone rigorous safety testing and certification

Cons

• Requires professional installation with a 60A two-pole breaker and 6 AWG wiring
• May not provide instant hot water to the furthest bathroom

Customer Reviews

Customers have generally praised the FOGATTI 14kW Tankless Water Heater Electric, with many highlighting its ability to provide continuous hot water and easy installation. Some users have noted that it may take a bit of time for the hot water to reach the furthest bathroom, but overall, the feedback has been positive.

Natural Gas Tankless Water Heater

Overview

The Natural Gas Tankless Water Heater is a high-performance, on-demand hot water solution designed for homes with multiple bathrooms. With its advanced combustion technology and compact design, this unit delivers efficient and energy-saving hot water to meet the demands of your household.

Specs

• Maximum Flow Rate: 4.21 GPM
• Heating Capacity: 81,888 BTU/h
• Fuel Type: Natural Gas
• Temperature Range: 95°F to 149°F
• Dimensions: 23.6″ x 14.2″ x 6.7″

Pros

• Provides on-demand hot water for 2-3 points of use simultaneously
• Advanced combustion technology for efficient gas consumption and quiet operation
• Stainless steel body and oxygen-free copper tank for superior durability and corrosion resistance
• Digital display for easy temperature adjustments

Cons

• Designed for natural gas usage, not suitable for propane or other fuel types
• Requires professional installation with proper ventilation and gas line hookup

Customer Reviews

While the customer reviews for this Natural Gas Tankless Water Heater are limited, the available feedback suggests that it is an efficient and reliable option for homeowners seeking an on-demand hot water solution.

4 Gallon Electric Mini Tank Water Heater

Overview

The 4 Gallon Electric Mini Tank Water Heater is a compact and energy-efficient under-sink solution that provides instant hot water on demand. Designed for point-of-use applications, this mini tank heater is a great choice for homes with limited space or for supplementing larger water heaters in multi-bathroom households.

Specs

• Tank Capacity: 4 gallons
• Voltage: 110V
• Heating Power: 1500W
• Temperature Range: 77°F to 176°F
• Dimensions: 13.8″ x 13.4″ x 17.3″

Pros

• Provides instant hot water on demand, reducing wait times and water waste
• Adjustable temperature control for maximum comfort and energy savings
• Compact design for easy under-sink installation
• Made with durable ABS and stainless steel materials

Cons

• Limited to single-point of use, not suitable for whole-home hot water needs
• Requires professional installation to ensure proper and safe operation

Customer Reviews

Unfortunately, there are no customer reviews available for this specific 4 Gallon Electric Mini Tank Water Heater model at the time of writing. However, similar under-sink electric water heaters from this brand generally receive positive feedback for their functionality and ease of installation.

3kW 120V Mini Instant Hot Water Heater Under Sink

Overview

The 3kW 120V Mini Instant Hot Water Heater Under Sink is a compact, on-demand water heating solution designed for low-flow, single-point use applications. With its user-friendly controls, advanced safety features, and efficient performance, this mini tankless heater can be a convenient addition to your home’s hot water system.

Specs

• Heating Power: 3kW
• Voltage: 120V
• Temperature Range: 30°C to 55°C (86°F to 131°F)
• Dimensions: 11.8″ x 6.7″ x 3.9″
• Safety Features: Leakage protection, overheat protection, IPX4 waterproof

Pros

• Compact and easy-to-use design with enlarged LED display and knob control
• Multiple safety features for reliable and secure operation
• Efficient on-demand hot water delivery without the need for preheating
• Suitable for a variety of applications, including sinks, kitchens, and small bathrooms

Cons

• Not recommended for high-flow or multiple-use applications
• 120V model may not provide as much heating capacity as 240V counterparts

Customer Reviews

Customers who have purchased the 3kW 120V Mini Instant Hot Water Heater Under Sink have generally reported positive experiences, particularly regarding its ease of use and reliable performance for single-point applications, such as a food truck or small bathroom sink.

VEVOR Tankless Electric Water Heater, 27kW

Overview

The VEVOR Tankless Electric Water Heater, 27kW is a high-powered, on-demand hot water solution designed to serve multiple bathrooms and other hot water needs in your home. With its advanced heating technology, user-friendly controls, and safety features, this tankless heater is a versatile option for larger households.

Specs

• Heating Power: 27kW
• Temperature Range: 30°C to 60°C (86°F to 140°F)
• Flow Rate: Dependent on water pressure and temperature settings
• Dimensions: 17.9″ x 12.2″ x 4.5″
• Safety Features: Constant temperature control, over-temperature protection, child lock

Pros

• Powerful 27kW heating system for efficient, on-demand hot water delivery
• LCD touch screen for easy temperature monitoring and control
• Compact, space-saving design for flexible installation options
• Comprehensive safety features, including a child lock, for peace of mind

Cons

• Requires a dedicated 240V electrical circuit with three 40A breakers and 8 AWG wiring
• May not be the most cost-effective option for smaller households with limited hot water needs

Customer Reviews

At the time of writing, there are no customer reviews available for the VEVOR Tankless Electric Water Heater, 27kW model. However, similar high-powered tankless heaters from this brand have generally received positive feedback for their performance and features.

Buying Guide: Choosing the Best Tankless Water Heater for 3 Bathrooms

Factors to Consider

• Heating Capacity: Ensure the tankless water heater has sufficient heating power to meet the hot water demands of your 3-bathroom home.
• Flow Rate: Look for a unit with a high enough flow rate (typically 3-4 GPM or more) to support multiple simultaneous uses.
• Fuel Type: Decide between electric or natural gas models based on your home’s infrastructure and personal preferences.
• Installation Requirements: Consider the electrical and/or gas hookup needs, as well as any special venting or piping requirements.
• Durability and Safety Features: Prioritize tankless heaters with robust construction, corrosion resistance, and comprehensive safety certifications and protections.

Pros and Cons of Tankless Water Heaters

Pros:

• Provide on-demand hot water, eliminating the need for a storage tank
• Compact and space-saving design for flexible installation options
• Energy-efficient operation, often leading to lower utility bills
• Longer lifespan compared to traditional tank-style water heaters

Cons:

• Higher upfront cost compared to traditional tank water heaters
• May require professional installation with specialized electrical or gas hookups
• May not provide instant hot water to the furthest bathroom, depending on the model and home layout
• Some electric models may have limited heating capacity for high-flow applications

FAQs

1. What is the recommended flow rate for a tankless water heater serving 3 bathrooms?

For a home with 3 bathrooms, we recommend a tankless water heater with a minimum flow rate of 3-4 gallons per minute (GPM) to ensure sufficient hot water supply for multiple simultaneous uses.

2. Do I need to upgrade my electrical panel for an electric tankless water heater?

Depending on the heating capacity of the electric tankless water heater, you may need to upgrade your home’s electrical panel and wiring to accommodate the higher power requirements. It’s best to consult with a licensed electrician to determine the appropriate electrical setup for your specific model and home.

3. How do I maintain a tankless water heater?

Proper maintenance of a tankless water heater typically includes regular flushing to remove mineral buildup, checking and replacing the anode rod (for gas models), and ensuring the venting system is clear and functioning correctly. Refer to the manufacturer’s instructions for specific maintenance recommendations.

4. Can a tankless water heater provide instant hot water to all 3 bathrooms?

The ability of a tankless water heater to provide instant hot water to all 3 bathrooms can depend on factors such as the unit’s heating capacity, the distance between the heater and the bathrooms, and the water flow rate. Some models may take a bit of time to deliver hot water to the furthest bathroom, but higher-capacity units are more likely to meet the hot water demands of a 3-bathroom home.

5. How do I determine the right tankless water heater size for my home?

When selecting a tankless water heater for a 3-bathroom home, you’ll need to consider the total hot water demand, including factors like the number of bathrooms, the number of appliances or fixtures that require hot water, and the desired flow rate. It’s best to consult with a professional plumber or the manufacturer’s recommendations to ensure you choose the right-sized unit for your specific needs.

Conclusion

Investing in the right tankless water heater for your 3-bathroom home can provide a reliable, energy-efficient, and space-saving hot water solution. By carefully considering factors like heating capacity, flow rate, fuel type, and safety features, you can find the perfect tankless water heater to meet the unique hot water demands of your household. With this comprehensive review and buying guide, you’ll be well-equipped to make an informed decision and enjoy the benefits of on-demand hot water for years to come.