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Best Under Sink Water Heater (2024 Updated)

If you're looking for a convenient and space-saving way to heat water for your home, an under sink water heater might be just what you need. These compact units are designed to provide hot water quickly and efficiently, without taking up valuable space in your kitchen or bathroom.

Before you make a purchase, there are a few factors to consider. First, think about the size and capacity of the unit you need. If you only need to supply hot water to one sink, a smaller unit may be sufficient. However, if you'll be using hot water in multiple locations or for larger tasks like dishwashing, you may need a larger unit with a higher capacity.

Another important factor is energy efficiency. Look for models that are ENERGY STAR certified, as these units have been proven to use less energy and save on utility bills. You'll also want to consider the installation process and whether you'll need professional help to get your new under sink water heater up and running.

Are you tired of waiting for the water to heat up in the morning? Do you want a more efficient way to supply hot water to your kitchen or bathroom sink? Investing in an under sink water heater could be the solution you're looking for. Keep reading to learn more about the benefits of these units, and to find out what factors to consider when choosing the right one for your home.

10 Best Under Sink Water Heater

# Product Image Product Name Product Notes Check Price
1
This product is ideal for providing instant hot water under the sink in homes, offices or small apartments.
2
Ideal for providing hot water in small spaces such as RVs, trailers, under sinks, and cupboards.
3
Ideal for point-of-use applications or as a booster for existing water heaters.
4
Ideal for providing hot water in small spaces such as under sinks or in tiny homes, powered by standard 120V outlets.
5
Ideal for providing instant hot water under the kitchen sink, with point-of-use installation and wall/floor mounting options.
6
This product is ideal for providing hot water on demand to a kitchen sink faucet.
7
Ideal for providing hot water to a sink in small spaces or areas with limited access to hot water.
8
The product is ideal for providing clean and safe drinking water by reducing pollutants and contaminants such as lead and chlorine.
9
The product is ideal for commercial kitchens that need to separate oil and water from wastewater before it enters the sewer system.
10
The product is ideal for those who want a comfortable and supportive pillow-top style waterbed mattress.
This product is ideal for providing instant hot water under the sink in homes, offices or small apartments.
Ideal for providing hot water in small spaces such as RVs, trailers, under sinks, and cupboards.
Ideal for point-of-use applications or as a booster for existing water heaters.
Ideal for providing hot water in small spaces such as under sinks or in tiny homes, powered by standard 120V outlets.
Ideal for providing instant hot water under the kitchen sink, with point-of-use installation and wall/floor mounting options.
This product is ideal for providing hot water on demand to a kitchen sink faucet.
Ideal for providing hot water to a sink in small spaces or areas with limited access to hot water.
The product is ideal for providing clean and safe drinking water by reducing pollutants and contaminants such as lead and chlorine.
The product is ideal for commercial kitchens that need to separate oil and water from wastewater before it enters the sewer system.
The product is ideal for those who want a comfortable and supportive pillow-top style waterbed mattress.

1. Led Under Sink Electric Water Heater

The Smart&Considered Design mini water heater has been designed with a smart touch control and LED display, making it easy to use. Its small size makes it perfect for under sink installation. The minimum water flow required for activation is just 0.4 GPM, making it ideal for a single sink. The compact size of the instant electric water heater requires a connection of 1* 40A circuit breaker & 8 AWG wire. It can be mounted at multiple angles, making it suitable for use in various places like kitchens, wet bars, schools, hospitals, hair salons, and boats. It is important to ensure that the product dimensions of 7.8" x 6.3" x 3.9" and water pipes fitting of 1/2" NPT male are suitable for your needs. The heater requires a 3.5kW at 120V power supply.

The mini water heater is reliable and durable, with 5 protections in place. It has been NFS approved, ensuring that it offers lead-free water. It is also ETL safety certified, with a leakage and overheat protection device to ensure your safety. The stainless steel and copper components ensure high efficiency and durability.

With the on-demand feature, the mini water heater heats water only when you need it, ensuring consistent hot water without waiting for preheat. The temperature rise of 1.0 GPM is 22°F, making it easy to get hot water between 85°F – 194°F in seconds. The LED display can be rotated, and the touch control panel makes it easy to set the ideal temperature. Note that this mini water heater is only suitable for sink use and not for bathing.

Pros

  • Smart touch control and LED display make it easy to use
  • Compact size perfect for under sink installation
  • Can be mounted at multiple angles
  • NFS approved, offering lead-free water
  • ETL safety certified, with leakage and overheat protection device
  • Stainless steel and copper components for high efficiency and durability
  • On-demand feature ensures consistent hot water without waiting for preheat
  • LED display can be rotated, making it easy to read output water temperature
  • Easy to set the ideal temperature

Cons

  • – Only suitable for sink use, not for bathing

2. Compact Rv Electric Water Heater With Accessories.

The 304 stainless steel construction of this mini hot water heater ensures that it is safe, durable, and long-lasting. Its anti-leakage plug and multiple safety protection functions protect you from scalding, leakage, and other injuries. The premium plastic shell is corrosion-resistant. This hot water heater is perfect for use in the kitchen, bar, school, hospital, community, and RV.

The digital display and smart inverter of this hot water heater ensure energy efficiency. The automatic heat preservation and storage of hot water, combined with its 3.0-gallon point-of-use mini-tank, makes it easy to get hot water right when you need it. It has a thermal efficiency of 98% and a maximum temperature of 167℉. The built-in smart chip heats up to the temperature you set and automatically insulates the water when it reaches the desired temperature.

This storage tank electric water heater is easy to use, thanks to its easy-to-operate knob temperature adjustment design. The vent valve, tee pipeline, pipes, and other accessories are complete for quick installation without additional expenses or preparation time of accessories. It can supply up to 2 sinks at a time and takes only 8-15 minutes to heat up to your desired temperature.

The compact design of this hot water heater allows it to be shelf, wall, or floor mounted (water inlet and outlet upward). It measures 18.0''L x12.6''W x10.2''H and weighs 8.86lbs. It uses 1/2″NPT NPT and has a power output of 1.5 kW, 110-120 volts. It comes with a one-year warranty and 24-hour customer service support, so you can contact them anytime if you have any questions or concerns.

This upgraded version of the hot water heater has an increased cylinder thickness of 1.2mm, making it more durable. The T-tube has also been replaced with a new one to make installation easier. The manufacturer is committed to constantly improving their products to meet the needs of their customers.

Pros

  • Safe, durable, and long-lasting construction
  • Energy-efficient with a 98% thermal efficiency
  • Compact design allows for shelf, wall, or floor mounting
  • Comes with a one-year warranty and 24-hour customer service support
  • Upgraded version with increased cylinder thickness for durability

Cons

  • – May not be suitable for larger households or commercial use

3. Ariston Andris 2.5 Gallon 120-Volt Corded Point Of Use Mini-Tank Electric Water Heater

The compact and versatile design of this product makes it suitable for wall or floor mounting, with a wall bracket included for easy installation. It provides instant hot water at the point of use, and can be installed as a booster or standalone unit. The installation process is hassle-free, requiring only a water connection and a standard 110/120 Volt outlet. The tank comes with a 6-year limited warranty and the parts have a 2-year warranty. This product features TitanShield technology which protects the inner surface against corrosion, ensuring long-lasting durability. The environmentally safe insulation increases energy efficiency, making it an eco-friendly choice for any household.

Pros

  • Compact and versatile design allows for wall or floor mounting
  • Provides instant hot water at the point of use
  • Easy installation process with only a water connection and standard outlet required
  • Comes with a 6-year limited warranty on tank and 2-year warranty on parts
  • TitanShield technology protects inner surface against corrosion
  • Environmentally safe insulation increases energy efficiency

4. Hot Sink: Camplux 1.3gal Mini Water Heater

The mini water heater is a highly efficient and durable product that is UL listed and uses a glass-lined tank with excellent insulation. Its freezing mode prevents the water tank from freezing, ensuring a long service life. With its compact dimensions of 11.4 W × 11.4 H × 9.7 D inches, this small water heater can be shelf, wall, or floor mounted with the included bracket. Once the water pipe is connected and the water tank is filled, simply plug the 35.43" cord into a 120V/12A power supply, and it will be ready for use.

The electric hot water heater comes with an overheat protection feature that automatically shuts it down when the water temperature exceeds 203°F. This ensures the safety of you and your family. Additionally, the point of use water heater has three temperature level settings, ranging from 68°F to 140°F, and a thermal efficiency of up to 99%.

With this mini water heater, there's no need to wait for hot water at the sink. You can now have on-demand hot water at your every need. The product also comes with a 1-year warranty for parts and 24-hour customer service for added convenience.

Pros

  • UL listed and uses a glass-lined tank with good insulation
  • Freezing mode can prevent the water tank from freezing, ensuring a long service life
  • Compact dimensions of 11.4 W × 11.4 H × 9.7 D inches that can be shelf, wall, or floor mounted
  • Comes with overheat protection for safety
  • Three temperature level settings, ranging from 68°F to 140°F, and a thermal efficiency of up to 99%
  • Provides convenient on-demand hot water
  • Comes with a 1-year warranty for parts and 24-hour customer service

5. Hot Spot Mini Tank Water Heater

The Point of Use 2.5 Gallons Mini Tank Water Heater is the perfect solution for those who want instant hot water where they need it. With a fast recovery rate, this mini tank water heater reduces standby loss and provides hot water on demand. It has an adjustable temperature range from 50°F to 149°F, making it easy to find the perfect temperature for any task.

This mini tank water heater is designed for easy installation, with compact dimensions of 12.95"W x 12.95"H (16.49" with valve) x 11.5"D, it can be wall or floor mounted under sink/counter and plugs into a standard 120V outlet. Its Incoloy 800 stainless steel heating element is excellent at resisting corrosion, handling and transferring heat at high temperatures, and has a heating efficiency of up to 99%, enhancing the water heater’s lifespan and durability. The enamel coating glass-lined gold porcelain lining provides better insulation and prevents leaking. The CSA T&P Relief valve CASH USA made, UL certified ensures a safe long service life.

The water heater's specifications include dimensions of 12.95"H x 12.95"W x 11.5"D and a weight of 15.4 lbs. It has water connections of 1/2" NPT, electrical requirements of 1.44 kW at 120 volts, and a plug-in connection with a 2 feet power cord. It has a maximum water pressure of 150PSI and a nominal current of 12A. Additionally, this mini tank water heater comes with a 3-year limited warranty for the tank, a 1-year warranty for parts, and 24-hour customer service.

Overall, the Point of Use 2.5 Gallons Mini Tank Water Heater is a reliable and efficient appliance that provides instant hot water where you need it. Its compact size, easy installation, and durable design make it the perfect choice for any home or office.

Pros

  • Fast recovery rate reduces standby loss
  • Adjustable temperature range from 50°F to 149°F
  • Incoloy 800 stainless steel heating element resists corrosion and has a heating efficiency of up to 99%
  • Enamel coating glass-lined gold porcelain lining provides better insulation and prevents leaking
  • CSA T&P Relief valve CASH USA made, UL certified ensures safe long service life
  • Compact design allows for wall or floor mounting under sink/counter
  • Easy to install with a plug-in connection to a standard 120V outlet
  • Comes with a 3-year limited warranty for the tank, a 1-year warranty for parts, and 24-hour customer service

6. Gold Sink Heater – Instant Hot Water Anywhere

The 110v Tankless Water Heater is a compact home water heater that can be installed under the sink, saving valuable space. With dimensions of 7.87 x 5.12 x 2.56 inches, this mini tankless water heater makes for an excellent gift for anyone looking to upgrade their sink. It is suitable for universal water pipes with a 1/2 inch diameter (inflow or outflow) and a US plug. The instant water heater is perfect for installation under the American kitchen island, kitchen, living room, or any other place where hot water is required for washing dishes, food, clothes, faces, and more.

The 3000W output tankless electric water heater heats water in just 3 seconds when it passes through the unit, which can lead to significant savings on your water bill. You can control the temperature according to the water flow, with a water temperature range of 35-50℃.

The 110v Tankless Water Heater is equipped with a safety automatic power-off feature that shuts down the unit when inactive, overheated, or leaking. It also stops heating when there is no water flow, saving you money on your electricity bills. Installation is easy, as you can install the small water heater on a shelf, wall, or bracket under the bathroom or kitchen sink. Simply connect the water pipes up and down to provide hot water for your sink.

It is important to note that the small tankless water heater 110v wire requirements are 2.5 square (#14 awg wire) and a breaker of at least 30 amps. Otherwise, it may trip. If you feel that the water heater is not heating up to your preferred temperature, try waiting longer or reducing the water flow.

Pros

  • Compact and space-saving design
  • Heats water in just 3 seconds, leading to potential savings on your water bill
  • Temperature can be controlled according to water flow
  • Automatic power-off feature for safety
  • Easy installation

Cons

  • – Limited to 110v power supply
  • – May require specific wire requirements and breaker specifications

7. Mini-Tank Water Heater For Under Sink Convenience

The 4-gallon point-of-use mini-tank is a wonderful addition to your home, providing hot water right where you need it. It features a stainless steel tank and heating element that ensure efficiency, durability, and long life service. The relief valve has been upgraded to provide you with maximum safety and protection. This water heater is perfect for those who want to save energy, as it has low standby loss power consumption. With the advanced Thermostop technology of Germany, it automatically stops heating or reheating when it reaches a high or low set temperature. This feature saves you money on your energy bills.

The EPS foaming technology used in this mini-tank is designed to heat water quickly and provide better insulation. The fast recovery rate eliminates long waits for hot water at your sink. It is safe and reliable, with overheat protection and an auto cut-off electricity feature if hot water does not come out. This mini-tank has an IPX24 water-proof rating and a 2.6ft plug-in cord, making it suitable for use in the kitchen, bathroom, bar, school, hospital, office, and RV.

Before purchase and installation, please verify that this model is the right size for your hot water needs and electrical requirements. The dimensions of this mini-tank are 18H x 12.2W x 11D inches, and it weighs 14 lbs. The water connections are 1/2 inch NPT, and the electrical requirements are 1.5 kW and 120 volts. The maximum pressure is 150PSI, and the nominal current is 13A.

Pros

  • 4-gallon capacity provides hot water right where you need it
  • Stainless steel tank and heating element designed for efficiency, durability, and long life service
  • Low standby loss power consumption saves energy
  • Advanced Thermostop technology of Germany stops heating or reheating when the water heater reaches a high or low set temperature
  • EPS foaming technology heats water quickly and provides better insulation
  • Fast recovery rate eliminates long waits for hot water at your sink
  • Safe and reliable with overheat protection and auto cut-off electricity feature
  • IPX24 water-proof rating and a 2.6ft plug-in cord make it suitable for use in various places

Cons

  • – May not be the right size for everyone's hot water needs
  • – May not be compatible with everyone's electrical requirements

8. Aqua-Pure Filter: Clean & Safe Drinking Water

The 3M Aqua-Pure Under Sink Water Filter System AP-DWS1000 Replacement Cartridge is the perfect solution for providing cleaner and clearer drinking water. This cartridge is designed for use with the 3M Aqua-Pure Under Sink Water Filter System AP-DWS1000 and features a Sanitary Quick Change cartridge design that allows for fast and easy cartridge change-outs with minimal effort. The advanced dual-stage carbon-block filtration process helps provide cleaner, clearer better-tasting drinking water by reducing particulate, chlorine taste and odor, lead, parasitic protozoan cysts, volatile organic compounds (VOCs), and methyl tert-butyl ether (MTBE).

Additionally, the AP-DWS1000 Water Filter System is designed with a built-in automatic shut-off meter that automatically shuts off the system after 625 gallons (2, 366 liters). This feature serves as a reminder to change cartridges and helps ensure that the system is always providing optimal filtration performance.

Overall, the 3M Aqua-Pure Under Sink Water Filter System AP-DWS1000 Replacement Cartridge is an easy-to-replace, effective, and efficient solution for providing cleaner and clearer drinking water.

Pros

  • Features a Sanitary Quick Change cartridge design for easy cartridge change-outs
  • Reduces particulate, chlorine taste and odor, lead, parasitic protozoan cysts, volatile organic compounds (VOCs), and methyl tert-butyl ether (MTBE)
  • Advanced dual-stage carbon-block filtration process provides cleaner, clearer better-tasting drinking water
  • Designed with a built-in automatic shut-off meter that reminds you to change cartridges

9. Stainless Steel Restaurant Grease Trap, 40lbs Capacity

The Commercial Grease Trap with 3 Top Inlet is an essential tool for restaurants, hotels, food trucks, canteens, and cafes. It is made of 1mm thickened stainless steel, which is anti-rust and anti-corrosion, ensuring a long service life. The overall dimension of this grease trap is 23.6" x 15.8" x 15.2" (60 x 40 x 38.5 cm, L * W * H). It has an inlet hole diameter of 1.77" / 4.5 cm, a water outlet hole diameter of 1.38" /3.5cm(for pipe), 1.18"/3cm (for valve), and an oil outlet hole diameter of 0.98"/25mm. The length of the threaded pipe is 80 cm / 31.5 Inches, and the maximum capacity is 40 pounds. It can flow up to 13 Gallons Per Minute (G.P.M.).

This restaurant grease trap is designed with 3 top inlet holes, making it easy to connect to a triple sink directly, making it convenient and efficient. It also has 2 water outlets for draining out all water, making it easy to clean the water sink. The upgraded drawer-like filter basket makes it effortless to clean up the solid waste without pulling out the inlet water pipe or opening the grease trap lid. This feature also prevents wasted water from spilling out. The package includes a deodorant cover for the inlet hole, a sealing ring for the valve, and pipe sealing tape, ensuring a reliable sealing effect.

The Commercial Grease Trap with 3 Top Inlet is a practical and high-quality kitchen tool that can withstand the demands of busy restaurant kitchens. Its heat-resistant steel wire water pipe is more durable and corrosion-resistant. The seamless grease trap body and full cover grease trap lid offer excellent sealing, while the threaded water outlet interface ensures a firm connection to the water outlet pipe.

Pros

  • Constructed by 1mm thickened stainless steel, which is anti-rust and anti-corrosion
  • Has 3 top inlet holes for easy connection to a triple sink
  • Effortlessly clean up solid waste with the upgraded drawer-like filter basket
  • Offers a reliable sealing effect with a seamless grease trap body and full cover grease trap lid
  • Can withstand the demands of busy restaurant kitchens

Cons

  • – May not be suitable for smaller kitchens or households

10. King Size Softside Pillow Waterbed Mattress White

Experience a luxurious and comfortable sleep with this waterbed mattress. It features a soft and plush feel that will make you feel like you're sleeping on a cloud. This waterbed also comes with a bamboo pillow top cover that adds an extra layer of comfort and support.

You can choose from three different options: 90%, 95%, or 100% waveless or free flow. This allows you to customize your sleeping experience according to your preferences. If you want a more stable and motionless sleep, the waveless option is perfect for you. On the other hand, if you prefer a more natural and free-flowing sleep, the free flow option is the way to go.

This waterbed mattress also comes with an adjustable digital heating system. You can easily control the temperature to suit your needs and preferences. Whether you want a warm and cozy sleep or a cool and refreshing one, this waterbed has got you covered.

To make things even more convenient, an electric pump with hose adapters is also included. This makes it easy to set up and inflate the waterbed in no time.

Overall, this waterbed mattress is a great investment for those who want to experience a comfortable and restful sleep. With its soft and plush feel, customizable options, adjustable heating system, and easy setup, you can't go wrong with this product.

Pros

  • Soft and plush feel for a comfortable sleep
  • Customizable options for a personalized sleeping experience
  • Adjustable heating system for temperature control
  • Comes with an electric pump with hose adapters for easy setup

Best Under Sink Water Heater FAQs

Can an under sink water heater be used for more than one sink or appliance?

Yes, an under sink water heater can be used for more than one sink or appliance. However, it is important to consider the capacity of the water heater and the demand for hot water from each sink or appliance. If the demand exceeds the capacity of the water heater, it may not be able to provide sufficient hot water to all the sinks or appliances at the same time. In such cases, it may be necessary to install multiple under sink water heaters or a larger capacity water heater that can serve all the sinks or appliances. It is also important to ensure that the water heater is installed correctly and in compliance with local plumbing codes to ensure safety and optimal performance. Overall, an under sink water heater can be a convenient and efficient solution for providing hot water to multiple sinks or appliances in a home or office.

How does an under sink water heater work?

An under sink water heater is a compact appliance that provides hot water to a single fixture, such as a sink, shower or bathtub. It operates by heating water that passes through a heating element. The amount of water that can be heated at one time is limited to the size of the unit, which is typically less than 10 gallons.

When hot water is needed, a valve is opened to allow cold water to flow into the unit. The water is then heated by the heating element and exits the unit through a pipe, ready for use. The heating element is controlled by a thermostat, which ensures that the water temperature remains constant.

Under sink water heaters are popular in homes and businesses where hot water is needed at a single location, but the main water heater is located far away. They are also used in situations where there is limited space for a larger water heater, such as in apartments or small offices. Overall, under sink water heaters are a convenient and efficient way to provide hot water to a single location.

How much does it cost to install an under sink water heater?

The cost of installing an under sink water heater can vary depending on multiple factors such as the brand, size, and complexity of the unit. On average, you can expect to pay anywhere between $100 and $500 for the unit itself, with installation costs ranging from $200 to $800.

If you opt for a smaller, less complex unit, it may cost you less to install. However, if you choose a more advanced unit that requires additional plumbing, electrical work, or ventilation, the installation costs may be higher. It's important to keep in mind that the installation costs may also vary depending on your location and the availability of qualified professionals in your area.

Overall, investing in an under sink water heater can provide you with many benefits, including energy efficiency, convenience, and a continuous supply of hot water. It's essential to do your research and compare costs before making a purchasing decision to ensure you get the best value for your money.

What are the benefits of installing an under sink water heater?

Installing an under sink water heater can bring numerous benefits to your home. Firstly, it provides you with instant hot water supply, eliminating the need to wait for the water to heat up before use. This can save you time and energy, especially when you need hot water for tasks such as washing dishes or showering.

Secondly, under sink water heaters are energy-efficient, as they only heat up the water that you need. This means that you don't have to heat an entire tank of water, which can result in wasted energy and higher electricity bills.

Thirdly, under sink water heaters are compact and can be easily installed in small spaces such as under the sink. This can be particularly useful for homes with limited space, as it eliminates the need for a large water heater tank.

Lastly, under sink water heaters are convenient and easy to use. They come with a range of features such as temperature control and automatic shut off, making them safe and user-friendly.

Overall, installing an under sink water heater can bring numerous benefits to your home, from energy efficiency to convenience and ease of use.

What is the best type of under sink water heater for my needs?

When it comes to choosing the best type of under sink water heater for your needs, there are a few factors to consider. The first thing to think about is the size of your household and how much hot water you typically use. If you have a larger family or tend to use a lot of hot water, you may want to consider a tankless water heater, which heats water on demand and can provide an endless supply of hot water. However, if you have a smaller household and don't use as much hot water, a traditional tank-style water heater may be a better option.

Another factor to consider is the energy efficiency of the water heater. Look for models with a high Energy Star rating, which can help save you money on your energy bills over time. Additionally, consider the installation process and whether you have the space and resources to install a more complex tankless model.

Ultimately, the best type of under sink water heater for your needs will depend on your specific household and usage patterns. It's worth doing some research and consulting with a professional to determine the best option for you.

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