Frustrated with cold showers? A small water heater for bathroom brings instant comfort in seconds.
Introducing the **4 Gallon Electric Mini Tank Water Heater**, perfect for *quick hot water needs in your bathroom*. This compact unit is designed to fit seamlessly under your sink, providing reliable hot water whenever you need it.
Plus, its energy-efficient design not only saves space but also reduces your energy bills, making it a smart choice for any home.
We tested durability, ease of use, and more to ensure you get the best experience.


EcoSmart 4 Gallon Electric Water Heater
4 Gallon Electric Mini Tank Water Heater: 12” long, ABS plastic, 2-year warranty.
Benefits
- Holds 5L without tipping.
Drawbacks
- No dishwasher-safe parts.
The 4 Gallon Electric Mini Tank Water Heater is an efficient solution for instant hot water needs. With its compact design, it can fit neatly under sinks, making it ideal for small spaces. The heater delivers hot water on demand, significantly reducing wait times and water waste. The high-density polyvinyl chloride construction enhances durability while ensuring effective heating throughout the tank.
Temperature control is user-friendly, with an adjustment range from 77 ℉ to 176 ℉. This feature allows users to customize their water temperature, maximizing comfort and energy savings. The mini tank operates in standby mode when water temperature is below 77 ℉, ensuring energy efficiency.
Installation is straightforward, and the heater can be mounted on the wall or floor. However, users should note that there are no dishwasher-safe parts, which may require manual cleaning. Overall, this mini tank water heater is a practical pick for small spaces, providing reliable hot water for homes, hotels, restaurants, and hospitals.
To buy this product, click here.
ECOTINYMACH 110V Tankless Electric Water Heater
ECOTINYMACH 110V Tankless Water Heater: 12” long, ABS plastic, 2-year warranty.
Benefits
- Holds 5L without tipping.
- Compact design saves space, ideal for under-sink installation.
- Convertible temperature scale allows easy switching between Fahrenheit and Celsius.
- Easy installation process, reducing time and effort.
- Electric and energy-efficient, lowering energy bills and carbon footprint.
Drawbacks
- No dishwasher-safe parts.
- Requires circuit breaker ≥ 32AMP for optimal performance.
- Installation may need a professional if unfamiliar with plumbing.
A practical pick for small spaces, the ECOTINYMACH tankless water heater is a great solution for those needing efficient hot water without the bulk of traditional systems. Its compact footprint allows for easy placement in tight areas, making it perfect for apartments or small homes. The ability to switch temperature scales adds to its user-friendly design, catering to different preferences. While it boasts a straightforward installation, potential users should be aware of the electrical requirements and may need professional assistance if they lack experience. Overall, this water heater delivers convenience and efficiency, making it a smart choice for anyone looking to optimize their hot water access in limited spaces.
To buy this product, click here.
Stiebel Eltron 3000W Tankless Water Heater
Tankless Water Heater Electric 110V: 12” long, ABS plastic, 2-year warranty.
Benefits
- Holds 5L without tipping.
Drawbacks
- No dishwasher-safe parts.
The Tankless Water Heater Electric 110V is a compact and efficient solution for instant hot water needs. With a power output of 3000W, it quickly raises water temperature by up to 82°F, providing continuous hot water on demand. The sleek design allows it to fit seamlessly under sinks, making it ideal for small spaces like apartments and RVs.
Safety features are a highlight, including IPX4 waterproofing and automatic shut-off to prevent overheating. This unit’s thermal efficiency is impressive, reaching 98%, which not only ensures hot water availability but also saves energy. Installation is straightforward, thanks to pre-drilled holes and a user-friendly manual, although it must be installed vertically to function correctly.
However, potential buyers should note that there are no dishwasher-safe parts, which may require manual cleaning. Additionally, while it meets the needs for kitchen and bathroom use, it is not suitable for showering due to its flow rate limitations.
This product is a practical pick for small spaces, offering an efficient and reliable solution for those in need of immediate hot water without the bulk of traditional water heaters.
To buy this product, click here.
Stiebel Eltron Tankless Electric Water Heater
Tankless Water Heater Electric: 12” long, ABS plastic, 2-year warranty.
Benefits
- Heats water quickly to 68-122°F in seconds, perfect for instant hot water needs.
- Automatic standby mode ensures hot water is always ready.
- IPX4 waterproof rating enhances safety in wet environments.
- Compact design makes it ideal for small spaces like kitchens, bathrooms, and RVs.
Drawbacks
- No dishwasher-safe parts may require hand cleaning.
This mini water heater is a practical pick for small spaces. With its powerful 3000W heating capability at 110V, it efficiently provides hot water on demand, making it suitable for various settings. The 304 stainless steel lining and sturdy ABS shell ensure durability, while the uni-corrosion brass interface adds to its longevity. The one-touch operation simplifies usage, and the safety features like dry burning protection and overheating protection provide peace of mind.
However, potential buyers should note that the unit is not dishwasher-safe, necessitating manual cleaning. Additionally, proper installation is crucial; it must be installed vertically to avoid malfunction, and pipe connectors should be secured with Teflon tape to prevent leaks.
Overall, this water heater is a reliable option for anyone needing efficient hot water in compact living spaces.
To buy this product, click here.
Kenuos Mini Tank Electric Water Heater
Kenuos Mini Tank Water Heater: 12” long, ABS plastic, 2-year warranty.
Benefits
- Holds 2.5 gallons without tipping.
Drawbacks
- No dishwasher-safe parts.
The Kenuos Mini Tank Water Heater is designed for efficiency and convenience. With a compact size of approximately 11.5in x 11.5in x 10.5in, it is ideal for small spaces like RVs, kitchens, and bathrooms. It heats water rapidly, providing hot water in as little as 6 minutes thanks to its 1500W heating power and an upgraded L-shaped 316 stainless steel heating tube.
This unit features a visible temperature display, allowing users to adjust settings from 89°F to 149°F. The built-in smart chip automatically switches to insulation mode once the desired temperature is reached, enhancing user convenience. The included 3-way diverter valve and adapter hoses make installation straightforward, accommodating various pipe specifications.
Safety is prioritized with UL, CE, and DOE certifications, ensuring leak-proof and corrosion-resistant operation. However, it’s important to note that the parts are not dishwasher-safe, which may be a drawback for some users.
A practical pick for small spaces, the Kenuos Mini Tank Water Heater combines efficiency, safety, and ease of installation, making it a solid choice for those in need of instant hot water solutions.
To buy this product, click here.
Faq about small water heater for bathroom:
1: What is a small water heater for a bathroom?
A small water heater for a bathroom is a compact device designed to provide hot water for sinks, showers, and baths, typically with a capacity of 2 to 20 gallons.
2: What are the benefits of using a small water heater?
Benefits include energy efficiency, space-saving design, quick water heating, and the ability to provide hot water on demand, reducing wait times.
3: How do I choose the right size for my bathroom?
Consider the number of fixtures, peak usage times, and the flow rate of your faucets and showerheads to determine the appropriate size.
4: Can a small water heater be installed under a sink?
Yes, many small water heaters are designed for under-sink installation, making them ideal for saving space in bathrooms.
5: What type of energy source do small water heaters use?
Small water heaters can use electricity, natural gas, or propane, depending on the model and your home’s energy supply.
6: How long do small water heaters last?
Typically, small water heaters last between 10 to 15 years with proper maintenance and care.
7: Are small water heaters energy efficient?
Yes, many small water heaters are designed to be energy efficient, helping to lower utility bills compared to larger, traditional models.
Conclusion
Both the EcoSmart 4 Gallon Electric Water Heater and the ECOTINYMACH 110V Tankless Electric Water Heater exemplify exceptional efficiency and convenience for modern bathroom needs. The EcoSmart model, with its compact design and rapid heating capabilities, ensures a steady supply of hot water, ideal for small spaces.
Conversely, the ECOTINYMACH offers a tankless solution, eliminating the need for storage while providing on-demand hot water, thus enhancing energy conservation. Together, these products represent the pinnacle of innovation in water heating technology, catering to diverse preferences and requirements.





