Choosing the right tankless water heater for a home with two bathrooms depends on several factors, including hot water demand, electrical capacity, and space. The 18kW Electric Tankless Water Heater 240V ETL Certified WiFi stands out for its smart control and high capacity, making it ideal for larger households in mild climates. Alternatively, the Westinghouse 14kW WiFi Model offers quick installation and smart features for smaller households or retrofit projects. For those prioritizing energy savings and space, the 14kW ORBEK provides reliable performance at a more accessible price point. Each of these options involves tradeoffs—whether in wiring, flow rate, or capacity—so understanding your household’s specific needs is key.
Get the little things that make your day delivered free — and shop member deals
- Fast, free delivery on millions of items
- Access to Prime Big Deal Days deals on October 6–7
- Prime Video, Amazon Music and more included
Key Takeaways
- Higher wattage models like the 18kW are better suited for larger households with higher hot water demand.
- Smart WiFi features enhance convenience but often require dedicated electrical circuits and can add to installation complexity.
- Energy efficiency and compact size are common advantages but may limit flow rate or simultaneous usage capacity.
- Installation requirements vary significantly, with some models needing professional electrical upgrades.
- Flow rate and point-of-use capacity determine whether a heater can comfortably serve two bathrooms simultaneously.
| 18kW Electric Tankless Water Heater 240V ETL Certified WiFi |  | Best Overall for High Capacity and Smart Control | Power: 18KW | Voltage: 240V | Maximum Amperage: 75A | VIEW ON AMAZON | See Our Full Breakdown |
| 14kW Tankless Electric Water Heater 240V for Sink & Shower, Gray |  | Best for Compact Spaces and Low Usage | Power: 14kW | Voltage: 240V | Dimensions: 15.87″x11.14″x2.87″ | VIEW ON AMAZON | See Our Full Breakdown |
| 14kW Tankless Electric Water Heater ORBEK On Demand 240V 3.38 GPM |  | Best for Simultaneous Use and Space Saving | Power: 14KW | Voltage: 240V | Flow Rate: 3.38 GPM | VIEW ON AMAZON | See Our Full Breakdown |
| Westinghouse 14kW Electric Tankless Water Heater, 240V, WiFi, ETL Certified, Gray |  | Best for Smart Home Integration | Power: 14KW | Voltage: 240V | Connections: 1/2″ NPT | VIEW ON AMAZON | See Our Full Breakdown |
| 18kW Tankless Electric Water Heater 240V for Whole House – Gray | | Best for Whole-House Hot Water | Power: 18KW | Voltage: 240V | Dimensions: 15.87″ x 11.14″ x 2.87″ | VIEW ON AMAZON | See Our Full Breakdown |
| tankless water heater for 2 bathroom | Power | Voltage | Dimensions | Flow Rate |
|---|---|---|---|---|
| 18kW Electric Tankless Water H | 18KW | 240V | 11.1" W x 19.2" H x 4" D | 4.3 gallons per minute |
| 14kW Tankless Electric Water H | 14kW | 240V | 15.87"x11.14"x2.87" | — |
| 14kW Tankless Electric Water H | 14KW | 240V | 14.2"H x 9.5"L x 3.1"W | 3.38 GPM |
| Westinghouse 14kW Electric Tan | 14KW | 240V | — | 3.4 GPM at 62°F inlet |
| 18kW Tankless Electric Water H | 18KW | 240V | 15.87" x 11.14" x 2.87" | — |
More Details on Our Top Picks
18kW Electric Tankless Water Heater 240V ETL Certified WiFi
This model excels in providing continuous, high-volume hot water, making it suitable for households with two bathrooms in mild climates. Its 18kW power ensures ample flow, and the WiFi control adds a layer of convenience for remote adjustments. Compared to smaller units, it supports multiple outlets simultaneously but requires a robust electrical system with a dedicated 150 Amp service, which may be a barrier in some homes. The compact wall-mounted design saves space, yet installation can be complex and usually needs a qualified electrician. Its safety certifications and energy-efficient technology make it a reliable choice for larger households.
Pros:- Provides endless hot water without preheating
- Space-saving wall-mounted design
- WiFi control for remote temperature management
- Energy-efficient with up to 99% savings
Cons:- Requires a 150 Amp service and specific wiring
- Installation may be costly and complex
- Less suitable for cold climates due to heating capacity
Best for: Households needing high capacity and smart features in a mild climate
Not ideal for: Homes with limited electrical capacity or in very cold climates
- Power:18KW
- Voltage:240V
- Maximum Amperage:75A
- Flow Rate:4.3 gallons per minute
- Dimensions:11.1″ W x 19.2″ H x 4″ D
- Safety Certifications:ETL
Our verdict“A robust, high-capacity choice for larger households with advanced electrical setups and mild climates.”
14kW Tankless Electric Water Heater 240V for Sink & Shower, Gray
This heater is a solid pick for small households or spaces where only 1-2 points need hot water at a time. Its 14kW power and compact design make it easy to install under sinks or on walls, ideal for retrofit projects. It offers instant hot water with precise temperature control and high efficiency, reducing energy costs by up to 50%. However, its limited flow rate and the need for a dedicated 60-amp circuit mean it’s not suitable for high-demand situations or large households. Installation might be straightforward for experienced DIYers, but some users could find electrical upgrades necessary.
Pros:- Energy-efficient with significant cost savings
- Compact and easy to install
- Precise temperature control
- High efficiency (99.8%)
Cons:- Limited to 1-2 points of use
- Requires a 60-amp circuit, possibly needing electrical upgrades
- Flow rate may be insufficient for larger households
Best for: Small households or point-of-use applications with limited demand
Not ideal for: Homes with two bathrooms that require simultaneous high-volume hot water
- Power:14kW
- Voltage:240V
- Dimensions:15.87″x11.14″x2.87″
- Water Connection:1/2″ NPT
- Temperature Range:86°F to 131°F
- Efficiency:99.8%
Our verdict“A practical, space-saving solution for small homes or single-point applications that prioritize energy efficiency.”
14kW Tankless Electric Water Heater ORBEK On Demand 240V 3.38 GPM
The ORBEK 14kW model balances flow rate and efficiency, providing up to 3.38 GPM of hot water. It’s tailored for households with 2-3 points of use, such as bathrooms or kitchens, and offers advanced safety features and stable temperature control. Its compact design makes it easy to install in tight spaces, and the high efficiency translates into lower energy bills. Nonetheless, the flow rate could be limiting if multiple fixtures are used at once, and it requires a dedicated 240V/60AMP circuit, which might involve electrical upgrades for some homes.
Pros:- Provides hot water for multiple points simultaneously
- High efficiency with energy savings up to 60%
- Compact, easy to install
- Advanced safety protections
Cons:- Flow rate may limit performance for larger households
- Requires a dedicated 240V/60AMP circuit
- Installation may require professional electrical work
Best for: Households needing reliable hot water for multiple points with space constraints
Not ideal for: Large households with high simultaneous hot water demand
- Power:14KW
- Voltage:240V
- Flow Rate:3.38 GPM
- Temperature Range:86°F – 140°F
- Dimensions:14.2″H x 9.5″L x 3.1″W
- Water Connections:1/2″ NPT
Our verdict“An excellent option for space-conscious households seeking reliable hot water for multiple outlets.”
Westinghouse 14kW Electric Tankless Water Heater, 240V, WiFi, ETL Certified, Gray
This heater combines reliable performance with smart home compatibility, including Alexa and Google Home. Its 14kW power and WiFi control make it convenient for modern households. It is relatively straightforward to install and offers safety features like leakage, overheat, and dry-fire protection. The flow rate of 3.4 GPM at typical inlet/outlet temperatures suits small to medium households, but it might struggle during peak demand if multiple fixtures are used simultaneously. Its safety certifications and smart controls make it a compelling choice for tech-savvy users.
Pros:- Instant hot water in 3 seconds
- Smart WiFi control with voice assistant compatibility
- Compact and easy to install
- High safety standards
Cons:- Requires dedicated 60A double-pole breaker
- Maintenance needed for inlet filter
- Limited flow rate for high-demand households
Best for: Tech-oriented households looking for smart control and safety features
Not ideal for: Homes with very high hot water demand or electrical limitations
- Power:14KW
- Voltage:240V
- Connections:1/2″ NPT
- Flow Rate:3.4 GPM at 62°F inlet
- Certifications:ETL
Our verdict“A smart, reliable choice for homes wanting integrated control and safety features in a compact form.”
18kW Tankless Electric Water Heater 240V for Whole House – Gray
This 18kW model offers substantial capacity for households requiring hot water across multiple fixtures simultaneously. Its high thermal efficiency and precise temperature control via LED display make it ideal for larger homes or households with two bathrooms that see heavy usage. The unit’s compact size and space-efficient design help it fit into various setups, but it demands two 40-amp circuit breakers and professional wiring. Its ability to serve 3-4 points simultaneously makes it a versatile choice for busy households, though the higher electrical requirements can increase installation complexity and cost.
Pros:- Energy-efficient with up to 50% cost savings
- Instant hot water with high thermal efficiency
- Precise temperature control with LED display
- Space-saving design
Cons:- Requires two 40-amp circuit breakers
- Installation may need professional electrical wiring
- Limited to 3-4 points of use simultaneously
Best for: Households needing reliable, whole-house hot water for multiple fixtures
Not ideal for: Homes with limited electrical capacity or where electrical upgrades are not feasible
- Power:18KW
- Voltage:240V
- Dimensions:15.87″ x 11.14″ x 2.87″
- Water Connection:3/4″ NPT
- Temperature Range:86°F to 131°F
Our verdict“A strong all-around choice for larger households seeking dependable whole-house hot water with energy savings.”
How We Picked
Our selection process focused on models that specifically meet the needs of households with two bathrooms, balancing capacity, efficiency, ease of installation, and safety features. We prioritized products with clear specifications for flow rate and power, ensuring they can deliver hot water simultaneously to multiple points. Compatibility with typical household electrical systems was a key criterion, along with user-friendly controls and safety protections. We also considered models that are versatile enough for different home sizes and climates, avoiding products that are overly specialized or limited in scope.
Factors to Consider When Choosing Tankless Water Heater For 2 Bathrooms
Choosing the right tankless water heater for two bathrooms involves balancing flow rate, electrical capacity, space, and additional features like smart controls. Understanding your household’s hot water needs and electrical wiring setup is essential to select a model that performs reliably without costly upgrades. This guide highlights the key factors to consider and compares the main types of units to help you make an informed decision.Flow Rate and Hot Water Demand
For two bathrooms, you’ll want a heater capable of delivering at least 3.4 GPM to 4.3 GPM to ensure simultaneous use without cold water surprises. Higher wattage models like the 18kW can handle greater demand, but smaller units like the 14kW ORBEK are better suited for limited usage points or if your household isn’t heavy on simultaneous hot water needs.
Electrical Requirements
Most high-capacity units require dedicated circuits—often 60A or 150A. Double-check your electrical system before purchasing. For homes with existing wiring upgrades, larger models will perform better; otherwise, a professional assessment is necessary to avoid safety hazards or costly rewiring.
Size, Space, and Installation
Compact, wall-mounted units like the Westinghouse or ORBEK are suitable for small spaces or retrofits. Larger models with higher wattage may need more space and professional installation, especially when wiring upgrades are involved. Consider your available space and whether you prefer DIY or professional setup.
Features and Safety
Smart controls, safety protections, and certifications add significant value. Units with WiFi and voice control, like the Westinghouse, enhance convenience. Safety features such as leak detection and overheat protection are critical for safe long-term operation, especially in busy households.
Frequently Asked Questions
Can a tankless water heater supply hot water to two bathrooms at the same time?
Yes, but only if the unit has enough flow capacity—typically at least 3.4 GPM or higher. Larger models like the 18kW units are better suited to support simultaneous use in two bathrooms, especially if both are used heavily. Smaller units may struggle during peak demand, leading to cold water or inconsistent temperature.
What electrical upgrades might I need for a high-capacity tankless heater?
Many high-capacity models require dedicated circuits—often 60A or 150A—along with specific wiring. In some homes, this means upgrading your main electrical panel or rewiring existing circuits, which should be performed by a licensed electrician to ensure safety and compliance with local codes.
Are electric tankless water heaters suitable for cold climates?
While electric units can work in cold climates, their heating capacity might be less effective if incoming water is very cold, especially for larger households. You may need a unit with higher wattage or supplemental heating options to maintain performance during winter months.
How much space do I need for installation?
Most models are designed to be space-saving, wall-mounted, and compact. For example, units like the Westinghouse or ORBEK fit easily in small closets or under sinks. Larger models, such as the 18kW for whole house, require a dedicated wall space and proper clearance for electrical connections.
What safety features should I look for?
Look for units with protections such as leak detection, overheat shutoff, dry-fire prevention, and over-voltage protection. Certifications from safety agencies like ETL or UL also indicate the product meets safety standards, providing peace of mind during operation.
Conclusion
For households with high hot water demand, especially in mild climates with electrical capacity, the 18kW Electric Tankless Water Heater makes sense. Small households or those with limited space should consider the 14kW models like the Westinghouse or ORBEK for their balance of size, efficiency, and smart features. Homeowners seeking a whole-house solution with reliable performance and energy savings should lean toward the larger, 18kW units, while those prioritizing space and simplicity might prefer the smaller, point-of-use models. Carefully evaluate your household size, electrical system, and priorities before making a choice.
Fall Picks
fall essentials
As an affiliate, we earn on qualifying purchases.
