Best Under-Sink Water Heaters in 2024

Introducing the solution for instant hot water at your fingertips—the best under-sink water heaters. Say goodbye to waiting for hot water to reach your faucet and hello to instant convenience. In our extensive in-home testing, we’ve discovered the top choice that outperforms the competition in both efficiency and reliability. Join us as we unveil the ultimate solution for on-demand hot water in your kitchen or bathroom.

EcoSmart ECO 11 Electric Tankless Water Heater

Transform your space with the EcoSmart ECO 11 Electric Tankless Water Heater. With its compact design, it saves up to 90% of space compared to traditional tank heaters. This 13-kilowatt wonder delivers endless hot water on demand, ideal for bathrooms, small sinks, or office breakrooms, with consistent performance within 1 degree of your selected temperature.

Experience efficiency like never before with 99% thermal energy efficiency. Say goodbye to wasted energy as this heater only activates when needed, unlike its tank counterparts. With its LED display and 1.3 to 3.1 gallons-per-minute output, enjoy convenience and reliability in every use. Say hello to endless hot water and goodbye to wasted space and energy.

Pros:

• Endless, on-demand hot water supply
• Consistent temperature within 1 degree
• 90% smaller than traditional tank heaters
• Energy-efficient with 99% thermal energy efficiency
• LED display for easy monitoring
• Ideal for various applications and point-of-use

Cons:

• Limited capacity is suitable for smaller setups
• Requires careful consideration of inlet water temperature for optimal performance

Bosch Electric Mini-Tank Water Heater

Compact yet powerful, the Bosch Electric Mini-Tank Water Heater offers instant hot water wherever you need it. With a sleek design and lightweight build, it fits conveniently under your sink, ensuring efficient use of space. Crafted with premium glass-lined material, it promises durability and easy maintenance, delivering long-lasting quality. Measuring 13.75 inches in width and height and 13.5 inches in depth, it’s designed for hassle-free installation, whether on a shelf, wall, or floor.

Equipped with a 4-gallon capacity and a fast recovery rate, this water heater eliminates long waits for hot water, supplying up to two sinks simultaneously. Its independent installation feature allows for versatile placement, with a 36- to 37-iinch cord for easy access to a 120-volt outlet. Say goodbye to cold water delays and hello to on-demand hot water with Bosch’s reliable and efficient mini-tank water heater.

Pros:

• Compact 4-gallon size for point-of-use convenience
• Outstanding 98% thermal efficiency
• Durable glass-lined material ensures a long service life
• The fast recovery rate for instant hot water on demand
• Versatile, independent installation with a 120-volt outlet
• Lightweight design at 17.3 pounds
• Can supply hot water to up to two sinks simultaneously

Cons:

• Limited to 4-gallon capacity
• The power source is restricted to a 120-volt outlet

Electric ECOTOUCH 9KW 240V Tankless Water Heater

Experience instant and endless hot water with the Electric ECOTOUCH 9KW 240V Tankless Water Heater. Its 9kW heating system delivers temperatures of 116°F or higher without preheating, ensuring comfort without waiting. Smart self-modulation adjusts power input based on flow rate, providing optimal energy efficiency and preventing scalding. The upgraded heating system eliminates “cold water sandwiching” and extends the unit’s lifespan by preventing corrosion inside pipes.

Safety is paramount with multiple protection devices and separate water and electricity lines, ensuring 100% safety and longevity. With a digital display and touch control panel, temperature adjustment is effortless. Compact at 15.74 inches in height and featuring a modern design, this heater blends seamlessly into any decor, making it the perfect companion for sinks.

Pros:

• Instant and endless hot water at 116 °C or higher
• Smart self-modulation for optimal energy efficiency (99.8%)
• Upgraded heating system prevent “cold water sandwich” and pipe corrosion
• Multiple safety features and ETL approval
• Compact design with a stylish, modern aesthetic
• Digital display and touch control panel for easy temperature adjustments

Cons:

• Requires hardwiring (240V/60Hz)
• Limited to 1.5-gallon capacity
• Pipes fittings: 1/2″ NPT (ensure compatibility)
• Black may not suit all aesthetic preferences

Camplux ME25 Mini Tank Electric Water Heater

Elevate your kitchen’s efficiency with the Camplux ME25 Mini Tank Electric Water Heater. Compact yet powerful, this 2.5-gallon wonder saves energy and money by delivering hot water right where you need it. With a sleek design and UL-approved safety features, including thermostat control and high-limit devices, it seamlessly blends into any space, ensuring both style and peace of mind.

Installation is a breeze, whether it is wall-mounted or set beneath your sink. And with Camplux’s renowned tech support and warranties, you can trust in its durability and performance for years to come. Say goodbye to cold water woes and hello to convenient, reliable hot water—every time.

Pros:

• Compact 2.5-gallon capacity for point-of-use hot water.
• Built-in insulation foam minimizes heat loss, saving energy and money.
• A glass-lined tank ensures durability and easy maintenance.
• An elegant, streamlined design enhances kitchen aesthetics.
• UL approval and thermostat control with three temperature settings.
• Easy installation, suitable for wall, floor, or shelf mounting.
• a versatile 120-volt outlet for independent or in-line installation.
• It comes with a CSA-listed temperature and pressure relief valve.
• 3-year limited warranty for the tank, 2-year warranty for parts.
• 24-hour customer service for technical support.

Cons:

• Limited hot water capacity is suitable for specific applications.
• It requires a power source and may not be suitable for off-grid use.

110V-120V 1.5KW 2.5-Gallon Electric Water Heater

Elevate your home’s water heating with the BISELONG 110V-120V 1.5KW 2.5-Gallon Electric Water Heater. Crafted from robust 304 stainless steel, its rustproof, lightweight design ensures durability. The innovative “L”-shaped heating element swiftly heats water, offering rapid temperature recovery for up to two sinks in just 8–15 minutes. With dry combustion, overheating, and high water pressure protection, it guarantees safety and efficiency.

Compact yet powerful, this heater’s energy-saving smart inverter maintains water warmth and boasts 98% thermal efficiency. Its space-saving design fits snugly under sinks, in RVs, or alongside appliances. Plus, with easy installation and complete accessories included, enjoy hassle-free setup. Experience uninterrupted hot water flow and reliable performance with BISELONG’s upgraded electric water heater.

Pros:

• A compact 2.5-gallon size fits under sinks
• Durable stainless steel construction
• Multiple safety features for peace of mind
• Smart inverter for energy-efficient heating
• Fast recovery rate, providing instant hot water
• Easy-to-use knob for temperature adjustment

Cons:

• A safety valve may require replacement for high-water pressure
• Limited capacity for larger households
• A plastic shell may not be as robust as an all-metal design

Best Under Sink Water Heaters Buying Guide

When it comes to having instant access to hot water, nothing beats the convenience of an under-sink water heater. These compact units are designed to be installed directly beneath your kitchen or bathroom sink, providing hot water on demand without the need for a large, bulky tank. This buying guide will help you navigate the world of under-sink water heaters, ensuring you make an informed decision that meets your specific needs.

Capacity and Flow Rate

One of the most important factors to consider when choosing an under-sink water heater is its capacity and flow rate. These units come in various sizes, ranging from small point-of-use models to larger, whole-house systems. Determine how much hot water you typically require at any given time and choose a unit that can meet your demands. The flow rate, measured in gallons per minute (GPM), will dictate how quickly the unit can deliver hot water.

Heating Technology

Under-sink water heaters utilize different heating technologies, each with its own advantages and disadvantages. Tankless models use either electric or gas heating elements to heat water on demand, while tank-style units store a small reserve of preheated water. Electric models are generally more energy-efficient and easier to install, but gas-powered units may be more cost-effective in areas with lower electricity rates.

Energy Efficiency

Energy efficiency should be a top priority when selecting an under-sink water heater. Look for models with high Energy Factor (EF) ratings, which indicate how efficiently the unit converts energy into heat. Additionally, consider units with advanced features like modulating power controls, which adjust the heating output based on demand, and insulated tanks to minimize standby heat loss.

Installation and Maintenance

Before making your purchase, consider the installation requirements for your chosen under-sink water heater. Electric models tend to be more straightforward, while gas units may require additional venting and gas line connections. Additionally, factor in the unit’s maintenance needs, such as descaling or anode rod replacement, to ensure it operates at peak performance for years to come.

Safety Features

Safety should never be compromised when it comes to water heaters. Look for models with advanced safety features like automatic shut-off valves, overheat protection, and pressure relief valves. These features can help prevent accidents and damage caused by overheating, excessive pressure buildup, or other potential hazards.

Warranty and Support

Finally, consider the manufacturer’s warranty and customer support offerings. A longer warranty period can provide peace of mind and protect your investment, while robust customer support can ensure you have access to knowledgeable assistance should you encounter any issues with your under-sink water heater.

Conclusion

Selecting the perfect under-sink water heater requires careful consideration of your specific hot water needs, energy efficiency goals, installation requirements, and safety concerns. By weighing the factors outlined in this guide, you can confidently choose a unit that delivers instant hot water while maximizing convenience, efficiency, and peace of mind.

Frequently Asked Question

What is the advantage of using an under-sink water heater?

Under-sink water heaters provide hot water directly at the point of use, eliminating the need to wait for hot water to travel from a central water heater. This results in energy savings and instant hot water availability, especially in areas far from the main water heating source.

How does the installation of an under-sink water heater differ from a traditional water heater?

Installing an under-sink water heater is generally more straightforward than installing a traditional water heater. These units are compact and designed for point-of-use applications, often requiring a dedicated electrical circuit. Traditional water heaters, on the other hand, are larger and may involve more complex installation, including connections to a gas line.

What size under-sink water heater is suitable for my needs?

The appropriate size depends on your hot water usage patterns. Consider factors such as the number of fixtures connected, the flow rate required, and the temperature rise needed. Smaller units with lower flow rates may be suitable for handwashing, while larger units are better for tasks like dishwashing.

Are under-sink water heaters energy-efficient?

Under-sink water heaters can be energy-efficient because they only heat water as needed, reducing standby energy losses. However, the efficiency may vary among different models. Look for units with high energy efficiency ratings or features like thermostatic control to optimize energy usage.

What safety features should I look for in an under-sink water heater?

Safety is crucial when selecting an under-sink water heater. Look for models with features such as a pressure relief valve, temperature controls, and a thermostat to prevent overheating. Additionally, ensure that the unit is installed according to the manufacturer’s guidelines and local building codes to guarantee safe operation.