Best Electric Tankless Water Heater for One Bathroom [In 2025]

In the realm of modern home appliances, the electric tankless water heater has emerged as a game-changer, offering a more efficient and space-saving solution for providing hot water. Whether you’re building a new home or upgrading your existing setup, finding the right electric tankless water heater for a single bathroom can be a daunting task. In this comprehensive review, we’ll delve into the top options on the market, providing you with the information you need to make an informed decision.

5 Best Electric Tankless Water Heater for One Bathroom Reviews

CRAFTSMAN 18kW 240-Volt 3.7 GPM Electric Tankless Water Heater

Overview

The CRAFTSMAN 18kW 240-Volt 3.7 GPM Electric Tankless Water Heater is a powerful and versatile solution designed to meet the hot water needs of one to two bathrooms. Its energy-efficient performance and user-friendly controls make it a top contender in the electric tankless water heater category.

Specs

• Warm to hot climates – serves up to 1-2 bathrooms | Cool to cold climates – serves up to 1 bathroom
• Requires a 240-Volt service with two 40 Amp double-pole breakers and two 8/2 AWG wires
• 35° F Temperature Rise – 3.7 GPM, 45° F Temperature Rise – 2.85 GPM, 55° F Temperature Rise – 2.4 GPM
• Digital control panel allows you to easily set the desired temperature up/down in increments of 1 degree F from 90 – 122 degrees
• Durable assembly with stainless steel, non-corrosive, lead free internal canisters and piping with standard 1/2 in. NPT (straight thread) fittings

Pros

• Provides sufficient hot water for one to two bathrooms
• Allows for precise temperature control
• Durable construction with stainless steel components
• Energy-efficient performance

Cons

• Requires dedicated 240-Volt electrical service
• May not be suitable for colder climates with higher temperature rise demands

Customer Reviews

Customers report mixed experiences with the water heater’s functionality, with some saying it works well while others mention it stops working after a few months of use. The temperature control system also receives mixed feedback, with one customer reporting temperature fluctuations between 110°F and 143°F.

Tankless Water Heater Electric for Single Sink Faucet by ThermoMate

Overview

The ThermoMate Tankless Water Heater Electric is a compact and efficient solution designed for single-sink applications. Its self-modulating power and instant hot water capabilities make it a practical choice for tight spaces within your home or business.

Specs

• [Instant Sink Hot Water] – 3500W power heating system provides on demand hot water in seconds for point-of-use applications, perfect for under / over sink faucet. Temperature setting range from 86°F – 131°F. 24 Hours standby. 0.4GPM-0.66GPM
• [Self-modulating Power] – Regulating the amount of energy required to heat water only when you need it with 99.8% efficient. 120V must Hardwired
• [Long-lasting Quality] – Cast aluminum heating element separated from water line, significantly reducing scale, corrosion and mineral buildup. SUS 304 stainless steel water tube
• Sleek Compact Size – 7.9″ x 6.4″ x 2.5″, Small water heater fit in tight places within your home or business, like under cabinets and sinks, hair salons, bar counters and hotel receptions, saving valuable storage space
• Touch control panel and digital temperature display allowing adjustment in 1° increment. IP25 waterproof, Standard 1/2″NPT pipe fitting, pre-wired pigtail for easy installation

Pros

• Instant hot water delivery for single-sink applications
• Self-modulating power for energy efficiency
• Compact and space-saving design
• Durable construction with stainless steel components

Cons

• Limited to single-sink usage
• Wiring issues reported by some customers

Customer Reviews

Customers appreciate the water heater’s adjustable temperature control and fast heating capabilities. They find it easy to install and consider it good value for money. However, the wiring receives mixed feedback, with one customer reporting issues with the internal wiring to the flow sensor.

FOGATTI 11kW Tankless Water Heater Electric

Overview

The FOGATTI 11kW Tankless Water Heater Electric is a powerful and efficient solution designed to provide endless hot water for one to two usage points throughout your home. Its advanced features and safety protections make it a reliable choice for whole-house hot water needs.

Specs

• Instant Endless Hot Water:11kW tankless electric water heater with a heating efficiency of up to 98%, it can output hot water within seconds of being turned on and maintain a stable temperature.It can supply up to 2.6 GPM flow rate hot water, suitable for 1-2 usage points throughout the entire house.
• Safety Protection: Fogatti Tankless hot water heater electric has passed CSA certification and have multiple safety protection features such as overheating protection and leak detection.
• Simple to use：The endless hot water heater electric features knob controls and an LED display. Digital temperature display allowing adjustment in 1° increment from 86°F to 140°F.It allows your family to efficiently enjoy endless hot water.
• Save Space: Electric Tankless water heaters are typically smaller than traditional tank water heaters, which can be wall-mounted, and more compact in size. Tankless electric water heater 240v can be installed in a variety of locations in your whole house.

Pros

• Powerful 11kW heating capacity for whole-house hot water
• Stable temperature output and fast heating capabilities
• Multiple safety features for reliable and safe operation
• Compact and space-saving design for versatile installation

Cons

• Requires professional installation due to electrical requirements
• Limited customer feedback available

Customer Reviews

The FOGATTI 11kW Tankless Water Heater Electric has limited customer feedback available, but the reviews suggest it works well for those who have installed it, with one customer mentioning it appears to be a good value for the money.

Instant Electric Water Heater 240V 6500W by YEELZ

Overview

The YEELZ Instant Electric Water Heater 240V 6500W is a high-powered and energy-efficient solution designed to provide instant and reliable hot water for your home. Its advanced self-modulating technology and safety features make it a compelling choice for single-bathroom or whole-house applications.

Specs

• 【Instant & Sufficient Hot Water】This tankless water heater utilizes energy-efficient heating technology and microelectronics. The instant water heater provides instant, sufficient, and endless hot water. The temperature of the water is adjustable between 86°F and 131°F, allowing you to make on-demand adjustments to the water temperature.
• 【Smart Self Modulation】The electric water heater features a frequency conversion design that automatically adjusts power input based on flow and temperature settings. When water flow decreases, the system operates at minimal power consumption, effectively minimizing energy waste.
• 【Safe & Reliable】The instant hot water heater features a memory function and an automatic alarm for power supply issues and failures. It is IPX4 waterproof and includes leakage protection, dry-burning protection, as well as automatic power-off in over-temperature and inactive states.
• 【Easy to Install & Application】This instant electric water heater comes with premade fixing screw holes, an English manual, Fixed bracket and 1/2 inch NPT standard interface. This small electric water heater is ideal for spaces such as kitchens, apartments, bathrooms, shower, washroom and under sink.

Pros

• Powerful 6500W heating capacity for whole-house hot water
• Instant and adjustable hot water delivery
• Energy-efficient self-modulating technology
• Comprehensive safety features for reliable operation
• Compact and versatile installation options

Cons

• Requires professional installation due to electrical requirements
• Limited customer feedback available

Customer Reviews

The YEELZ Instant Electric Water Heater 240V 6500W has received positive feedback from customers, with one reviewer stating that the water heater works perfectly as it should.

Buying Guide: Choosing the Best Electric Tankless Water Heater for One Bathroom

Capacity and Performance

• Consider the water heating capacity (in kW) and flow rate (in GPM) to ensure the heater can meet the hot water demands of your bathroom.
• Look for features like self-modulating technology and temperature adjustment capabilities for efficient and personalized hot water delivery.
• Evaluate the heater’s ability to maintain stable water temperatures and provide instant hot water, especially for single-sink applications.

Installation and Electrical Requirements

• Determine the appropriate voltage (120V or 240V) and ensure your home’s electrical system can support the heater’s power requirements.
• Consider the installation complexity and whether you’ll need professional assistance, especially for larger whole-house tankless water heaters.
• Verify the water connections, mounting options, and any additional accessories or hardware needed for a seamless installation.

Safety and Durability

• Look for safety features like overheating protection, leak detection, and dry-burning prevention to ensure reliable and safe operation.
• Assess the construction quality and materials used, such as stainless steel components, to ensure long-lasting performance.
• Check for any certifications or warranties that provide assurance of the heater’s quality and the manufacturer’s commitment to customer satisfaction.

Sizing and Compatibility

• Determine the appropriate size and capacity of the tankless water heater based on the hot water needs of your bathroom, considering factors like the number of fixtures and expected usage patterns.
• Ensure the heater’s dimensions and mounting options are compatible with the available space in your bathroom or home.

Customer Reviews and Feedback

• Review customer feedback and ratings to gauge real-world performance, reliability, and overall satisfaction with the tankless water heater.
• Pay attention to any common issues or limitations reported by users to help identify the best fit for your specific requirements.

FAQ

1. How do I determine the right size of an electric tankless water heater for my bathroom?

To determine the appropriate size, consider the number of bathrooms, the expected hot water demand, and the climate conditions. Generally, a 18kW to 24kW heater is suitable for a single bathroom in a moderate climate, while a larger 30kW to 36kW heater may be required for colder climates or homes with multiple bathrooms.

2. What are the key differences between a tankless and a traditional tank-style water heater?

Tankless water heaters provide on-demand hot water, eliminating the need for a storage tank and reducing standby energy losses. They are typically more energy-efficient, compact, and offer endless hot water supply. In contrast, traditional tank-style heaters have a limited hot water capacity and require more space.

3. Do electric tankless water heaters require special installation?

Yes, electric tankless water heaters often require professional installation due to their high-power electrical requirements. This includes ensuring the proper voltage, circuit breaker size, and wire gauge to safely power the heater. Proper plumbing connections and venting considerations are also important for a successful installation.

4. How do I maintain an electric tankless water heater?

Regular maintenance, such as flushing the system to remove mineral buildup, is important for prolonging the life and efficiency of an electric tankless water heater. Checking the electrical connections, flow sensors, and safety features periodically can also help ensure optimal performance and prevent any issues.

5. Are electric tankless water heaters more energy-efficient than traditional tank-style heaters?

Yes, electric tankless water heaters are generally more energy-efficient than traditional tank-style heaters. By only heating water on-demand, they avoid the energy losses associated with keeping a large tank of water constantly heated. This can result in significant energy and cost savings over time.

Conclusion

Choosing the best electric tankless water heater for a single bathroom is a balance of considering factors like capacity, performance, installation requirements, safety, and customer feedback. The options reviewed in this article offer a range of features and capabilities to meet the hot water needs of your home. By carefully evaluating your specific requirements and the pros and cons of each model, you can make an informed decision and enjoy the benefits of an efficient and reliable electric tankless water heater.