Under sink water heaters can transform the way you access hot water in your home or office, offering instant, efficient heating right where you need it.
To assist you in navigating this crucial decision, we’ve embarked on a comprehensive testing and evaluation process to scrutinize a wide selection of under sink water heaters.
Throughout our rigorous examination, we concentrated on three pivotal factors to consider when selecting an under sink water heater:
- Size: Consider the capacity for tank heaters or flow rate for tankless models. For instance, a 3.1-gallon tankless heater provides 3.1 gallons of hot water per minute.
- Water Pressure: Choose based on usage; 115 PSI suits basic tasks, while activities like washing appliances or watering distant plants require at least 150 PSI.
- Temperature Range: Look at the minimum and maximum water temperatures the heater can provide, indicating its versatility for various applications.
In this article, we have presented 8 best under sink water heaters that not only meets your immediate hot water needs but also integrates seamlessly into your space without inflating your energy bills.
Accompanying our findings is an in-depth “Buying Guide”, providing you with the knowledge to discern what features and specifications align with your requirements
Best Under Sink Water Heater 2024
| Best Under Sink Water Heater | Size | Water Pressure | Temperature Range | Buy Now |
|---|---|---|---|---|
| EcoSmart ECO 11 Electric Tankless Water Heater | 3.1 Gallons | 80 to 140°F | Check On Amazon | |
| Bosch Electric Mini-Tank Water Heater | 4 Gallons | 150 PSI | 65 to 145°F | Check On Amazon |
| EcoTouch Tankless Water Heater | 67 to 116°F | Check On Amazon | ||
| Camplux ME25 Mini Tank Electric Water Heater | 2.5 Gallons | 150 PSI | 50 to 140°F | Check On Amazon |
| BISELONG 110V-120V Electric Tank Heater | 2.5 Gallons | 115 PSI | 149 °F | Check On Amazon |
| Thermoflow Corded Electric Mini Tank Water Heater | 2.5 Gallons | 150 PSI | 45 to 167°F | Check On Amazon |
| Eccotemp EM-2.5 Electric Mini Tank Water Heater | 2.5 Gallons | 50 to 140°F | Check On Amazon | |
| Agust Electric Hot Water Heater | 3.0 Gallons | 115 PSI | 167 °F | Check On Amazon |
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Best Under Sink Water Heater Reviews
1. EcoSmart ECO 11 Electric Tankless Water Heater
EcoSmart is one of the most famous brands that comes to mind for home accessories, especially water heaters. This brand designs a variety of water heaters for pools, spas, whole-home applications, and even under sink options.
Our first pick for this list of the best under sink water heaters is the EcoSmart ECO 11. This is probably the best tankless heater you could find to install in a cabinet under your sink since it measures only 3.75 x 8 x 11.5 inches in size. Still, it manages to deliver about 3.1 gallons of warm water every minute which is more than enough for basic applications. Plus, you will get a temperature range of 80 to 140°F with EcoSmart ECO 11.
With the given size, the EcoSmart ECO 11 is nearly 90% smaller compared to traditional tank-type water heaters. On top of that, this machine is also nearly 99% more efficient in terms of thermal energy consumption which is a big deal. It is powered by a 13 KW heating system which will be perfect for bathrooms, sinks, office kitchens, and many other similar applications. You can also adjust the water flow between 1.3 to 3.1 gallons per minute as per your demands.
Best Features
- It measures about 3.75 x 8 x 11.5 inches in size
- It offers 3.1 gallons size
- Offers a temperature range of 80 to 140°F
Pros
- One of the most compact options
- Offers great water flow with high temperature
- Powered by a 13 KW heating system
Cons
- A bit more expensive than other options
2. Bosch Electric Mini-Tank Water Heater
If water heater size is an important factor for you, you should go with a tank-type water heater. But so is the installation size since you are looking for one to install under a sink. Therefore, we are introducing this mini-tank water heater from Bosch Thermotechnology.
Usually, tank-type water hearts are quite large and are not suitable for compact installation spaces. But, Bosch Thermotechnology has managed to bring a perfect option to bridge the gap between these 2 types, the Bosch Tronic 3000 Bosch Electric Water Heater. Despite being a tank-type option, it measures only 13.75 x 13.5 x 13.75 inches in size, making it suitable for compact installation spaces. And, you will still get a 4 gallons built-in tank on the Bosch Tronic 3000 Bosch Electric Water Heater to suffice for your warm water needs.
The thermal efficiency of the Bosch Tronic 3000 Bosch Electric Water Heater is about 98%. So, it can offer you hot water on demand without being heavy on your pocket. Plus, it also has premium glass-lined material on the inside, extending its lifespan for quite a long time. Since this is a tank-type water heater, you can even connect 2 sinks with the same unit without worrying about the water flow rate.
Best Features
- It measures about 13.75 x 13.5 x 13.75 inches in size
- It offers 4 gallons size
- Offers a temperature range of 65 to 145°F
- Can be used with 2 sinks simultaneously
Pros
- Compact option along with a 4 gallons tank
- Easy to install or mount on a shelf, wall, or floor with floor mounting brackets
- Built-in pressure relief valve to improve its safety rating
Cons
- It does not have a digital display
3. EcoTouch Tankless Water Heater
EcoTouch is also a brand that mainly deals with water heaters and other similar equipment. The most attractive point of water heaters designed by EcoTouch is their stylish design paired with a versatile range of applications.
In the 3rd position, we are bringing the EcoTouch Tankless Water Heater. Unlike most other options that you can find for a tankless water heater, the EcoTouch Tankless Water Heater measures only 15.25 x 11.2 x 4.9 inches in size, making it a very attractive option in terms of design. It also features a compact digital display that indicates the current water temperature that you can manually adjust from the control options provided right below the display panel.
The EcoTouch Tankless Water Heater is powered by a 5.5 KW heating system, offering a temperature range of 67 to 116°F with sufficient water flow capacity. As you can adjust the water temperature yourself, you will get about 98% energy efficiency on the EcoTouch Tankless Water Heater which is quite high compared to other choices. The electrical circuit and water pipelines inside the EcoTouch Tankless Water Heater are mounted separately to avoid any electrical anomaly caused by leakage. This design is also approved by ETL and it qualifies for UL, assuring its safety.
Best Features
- It measures about 15.25 x 11.2 x 4.9 inches in size
- Approved by ETL and qualifies for UL
- Offers a temperature range of 67 to 116°F
- Powered by a 5.5 KW heating system
Pros
- Offers about 98% energy efficiency
- Safe, durable, and attractive design
- Digital display with touch control on the water heater
Cons
- Maximum heating temperature is lower than other options
4. Camplux ME25 Mini Tank Electric Water Heater
Camplux is a brand that usually manufactures accessories that you would find beneficial for indoor as well as outdoor applications. As for water heaters, this brand manufactures both gas water heaters as well as electrical water heaters.
The Camplux ME25 Electric Water Heater is yet another mini-tank water heater that we are including on this list. This unit features a capacity of 2.5 gallons which might be suitable if your requirements aren’t that high. As for the size, the Camplux ME25 Electric Water Heater measures nearly 11.75 x 10.38 x 14.5 inches in size, making it perfect for compact spaces. To increase its service life, Camplux has also provided a glass-lined tank on the inside of the Camplux ME25 Electric Water Heater.
When it comes to safety, the Camplux ME25 Electric Water Heater does not leave any boxes unchecked. It has a thermostat that allows manual adjustment of water temperature so that you can always be sure about using the water coming out of your tap and its temperature. It also features UL approval which is essential for home appliances. There is also a built-in safety feature on the Camplux ME25 Electric Water Heater that prevents overheating of the water and in turn, the problems caused by overheating.
Best Features
- It measures about 11.75 x 10.38 x 14.5 inches in size
- It offers 2.5 gallons size
- Offers a temperature range of 50 to 140°F
- UL approved design
Pros
- Great build quality and service life
- Manual control for water temperature adjustment
- Comes with a year of warranty
Cons
- Tank capacity might be too low for some users
5. BISELONG 110V-120V Electric Tank Heater
If you are looking for a tank-type water heater under an affordable price range, the following option from BISELONG might be worth checking out. BISELONG is also a brand that primarily focuses on water heaters along with many other essential home accessories.
The BISELONG Electric Water Heater is yet another compact option we found for a tank-type water heater. This unit has a 14.57 x 13.7 x 13.31 inches footprint and still offers a 2.5 gallons built-in water tank. Thus, you can easily install this water heater adjacent to the primary water pipelines of your sink. Along with the water heater, you will also receive stainless steel water hoses, a vent valve, and a 16 inches long FIP.
Other than that, there are multiple safety protections installed in the BISELONG Electric Water Heater to protect the unit from problems like scald, leakage, or other design faults. Even though this is a tank-type water heater, you can get on-demand hot water from this water heater thanks to its automatic heat preservation system. The BISELONG Electric Water Heater offers a maximum of 149°F water temperature which should be sufficient for most applications.
Best Features
- It measures about 14.57 x 13.7 x 13.31 inches in size
- It offers 2.5 gallons size
- Offers a temperature range of up to 149°F
- Offers 98% thermal efficiency
Pros
- Built-in smart chip to retain water temperature
- Can be used for 2 sinks simultaneously
- Pretty cheap option for a tank-type water heater
Cons
- Takes 8 to 15 minute to warm up the water
6. Thermoflow Corded Electric Mini Tank Water Heater
Thermoflow is also bringing a compact yet powerful option for an under sink water heater. If you are looking for a tankless option, you can also find that on Thermoflow’s product page.
Up next, we have one more mini tank-type water heater coming from Thermoflow. The Thermoflow Mini Tank Water Heater is a great option in terms of design since this unit offers a German design. This water heater will offer you an adjustable water temperature between 45 to 167°F which is pretty high compared to many other options. The Thermoflow Mini Tank Water Heater also has an advanced thermostop technology that reduces energy loss.
While we are talking about safety, the Thermoflow Mini Tank Water Heater also includes an EPS foaming technology that ensures proper insulation and avoids leakage problems. Other safety circuits on the Thermoflow Mini Tank Water Heater include overheating protection, auto cut-off, IPX24 water resistance, and much more. So, the Thermoflow Mini Tank Water Heater will be the right choice for your office, home, RV, and other similar applications.
Best Features
- It measures about 18 x 11 x 12.2 inches in size
- It offers 2.5 gallons size
- Offers a temperature range of 45 to 167°F
- EPS foaming technology for better insulation
Pros
- Advanced thermostop technology for energy efficiency
- It has IPX24 water resistance
- Stainless steel tank
Cons
- Larger in terms of height
7. Eccotemp EM-2.5 Electric Mini Tank Water Heater
Eccotemp has also lined up a great option for a mini tank heater on our list that grants you many features within a very affordable price range.
The Eccotemp Mini Tank Water Heater is also a similar tank-type option for water like the ones we have seen so far. It offers a 2.5 gallons water tank built-in within the unit, which itself measures about 14.75 x 11 x 13.25 inches in size. Therefore, fitting the unit below your sink would not be a problem. The adjustable temperature range of the Eccotemp Mini Tank Water Heater ranges between 50 to 140°F, so you can get the desired output temperature from the unit.
The Eccotemp Mini Tank Water Heater also includes a temperature and pressure relief valve to ensure the safety of the user as well as the device in the event of overheating or overuse. You will be able to mount this water heater on the wall or even on the floor with the help of mounting brackets included with the heater. The Eccotemp Mini Tank Water Heater has a recovery time ranging between 25 to 45 minutes which depends upon your usage.
Best Features
- It measures about 14.75 x 11 x 13.25 inches in size
- It offers 2.5 gallons size
- Offers a temperature range of 50 to 140°F
- Comes with a built-in temperature and pressure relief valve.
Pros
- Compact design and easy to install
- Comes with mounting brackets
- Adjustable temperature range
Cons
- Recovery period might be too long
8. Agust Electric Hot Water Heater
If you still haven’t found the right option for an under sink water heater in your budget so far, the following option from Agust is right for you. This is also a budget-friendly option for a mini-tank water heater.
In the end, we are bringing one more budget-friendly option for an under sink tank-type water heater. The Agust Electric Hot Water Heater is the best option for home applications since it operates on 110 to 120 volts input. Plus, it is also a compact unit with 3 gallons capacity that resolves the installation problem for a lot of users. The Agust Electric Hot Water Heater is made up of stainless steel so you will never have to worry about problems like rust or corrosion even after frequent water contact.
Despite the low price range, the Agust Electric Hot Water Heater offers the highest water temperature option up to 167°F which is missing from even the premium options. Since this is a tank-type water heater, it can suffice for 2 sinks at a time without any problem. Plus, it can get the inlet water ready to use within 8 to 15 minutes after you turn the unit ON. Unlike most other options, the Agust Electric Hot Water Heater also features a digital display to easily acknowledge the status of the water heater.
Best Features
- Easy-to-operate knob for temperature adjustment
- It offers 3 gallons size
- Offers a temperature range of up to 167°F
- It has a digital display
Pros
- Can be used for 2 sinks at a time
- Tank size is comparatively larger
- Water is ready to use within 8 to 15 minutes based on temperature level
Cons
- Comparatively larger than many other options
Buying Guide for the Best Under Sink Water Heater
Choosing the best under sink water heater involves navigating various features and specifications to find the perfect match for your immediate hot water needs. This buying guide aims to simplify the process, focusing on the key factors you should consider to ensure you select a unit that is efficient, reliable, and suitable for your space.
1. Type of Under Sink Water Heaters
When selecting an under sink water heater, the initial decision between a tank-type and a tankless model is crucial, each offering distinct benefits within different budgets.
- Tank-Type Water Heaters store and pre-heat water in a tank, providing a continuous flow and the ability to supply multiple faucets simultaneously. Their main drawbacks include higher energy consumption due to the need to maintain the water temperature and a delay in getting hot water initially.
- Tankless Water Heaters, favoured for their immediate heating capability, are compact and ideal for tight spaces, eliminating waiting time for hot water. They are energy-efficient since they heat water on demand but may offer limited flow rate compared to tank models.
2. Considering Size and Capacity
After choosing the heater type, assess its size and capacity to ensure it meets your requirements. For tank-type heaters, a larger tank means more available hot water but requires more energy to keep the water heated.
Meanwhile, tankless heaters are gauged by flow rate (how much hot water they deliver per minute), where a higher rate means more efficient water heating. Ensure the unit’s physical size fits under your sink and that its capacity or flow rate matches your hot water needs to avoid frequent, energy-intensive use.
3. Energy Efficiency
When selecting an under sink water heater, prioritize models with a high Energy Star rating to ensure lower running costs. These ratings indicate a heater’s energy efficiency, with higher scores reflecting better performance per unit of energy consumed, leading to reduced energy bills.
4. Safety Features
Safety is crucial for under sink water heaters due to the inherent risks of combining water and electricity. Key features to look for include a built-in thermostat for temperature control, a pressure relief valve to prevent pressure build-up, and, in advanced models, modulation units and digital displays for enhanced safety and maintenance alerts. Always consider the warranty period as an indicator of the unit’s reliability and component quality.
Under Sink Water Heaters – FAQs
Ans: Tank-type can serve multiple faucets; tankless models are typically designed for single-point use.
Ans: Professional installation usually takes a few hours, depending on existing plumbing.
Ans: Yes, annual maintenance is recommended to ensure efficiency and extend lifespan.
Ans: Yes, tankless models heat water on demand, reducing energy consumption compared to tank models.
Ans: Some models are DIY-friendly, but professional installation is recommended for safety and warranty reasons.
Ans: Typically, 5-10 years, depending on the model, usage, and maintenance.
Ans: Most models require a minimum water pressure, specified by the manufacturer, to operate effectively.
Ans: Primarily, they are electric due to their compact size and installation location.
Ans: Yes, most models allow temperature adjustments to suit your preference.
Ans: Look for features like overheat protection, anti-scald technology, and pressure relief valve
Ans: Under sink water heaters may not be ideal for high-demand commercial settings like large cafes or restaurants due to their limited flow rate. However, they can be effective in smaller establishments with minimal sink usage.
Ans: For optimal performance, keep the under sink water heater within six feet of the tap to minimize heat loss and ensure prompt delivery of hot water, particularly important for tankless models.
Conclusion
While the market is flooded with various water heaters, under sink models are particularly well-suited for small spaces, offering quick access to hot water.
We’ve curated a list of the best under sink water heaters, highlighting their key features to assist you in finding the perfect match for your needs. For more guidance, refer to our buying guide and top recommendations.
- The EcoTouch Tankless Water Heater excels in small spaces with its digital display, 67 to 109°F temperature range, and efficient 5.5 KW system for quick heating.
- For higher capacity needs, the Bosch Electric Mini-Tank Water Heater offers 4 gallons of immediate hot water and durability, ideal for two sinks.
- The EcoSmart ECO 11 Electric Tankless Water Heater, a premium tankless model, delivers up to 3.1 gallons per minute with a 13 KW heater, featuring a compact design and an 80 to 140°F temperature range, perfect for under sink use with adjustable flow rates.
