Best Compact Water Heaters of 2025

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Compact water heaters are a great solution for homeowners who are looking to save space while still enjoying the convenience of hot water. These water heaters are designed to be compact and efficient, making them perfect for small apartments, condos, or even RVs. They come in a variety of sizes and styles, so homeowners can choose the one that best fits their needs. Some models even offer energy-saving features like programmable timers and adjustable thermostats, helping homeowners save money on their energy bills. With their space-saving design and energy-efficient features, compact water heaters are a smart choice for any homeowner looking to upgrade their hot water system.
At a Glance: Our Top Picks
Top 10 Compact Water Heaters
Ariston Andris 8 Gallon 120-Volt Point of Use Mini-Tank Electric Water Heater
The Ariston Mini-Tank Water Heater is a compact and versatile water heating solution that can be wall or floor mounted. This electric water heater provides immediate hot water at the point of use, making it ideal as a booster or standalone unit. Installation is a breeze, requiring only a water connection and standard 110/120 Volt outlet (hard wiring is also an option). The Mini-Tank Water Heater comes with a 6-year limited warranty on the tank and a 2-year warranty on parts. Its TitanShield technology fully protects the inner surface against corrosion, while robust and environmentally safe insulation increases energy efficiency. With its compact design and easy installation, the Ariston Mini-Tank Water Heater is perfect for those who need hot water quickly and conveniently.
BISELONG 2.5 Gallon Electric Water Heater
The BISELONG 2.5 Gallon Electric Water Heater is an ideal solution for providing hot water right where you need it. Made of stainless steel, this mini hot water heater is safe, durable, and corrosion-resistant. It features a smart inverter for energy-saving, automatic heat preservation and storage of hot water, and easy-to-use knob temperature adjustment design. With a fast recovery rate, it eliminates long waits for hot water at your sink. The compact design allows you to shelf, wall or floor mount it, making it perfect for kitchen, bar, school, hospital, community and RV.
Daordaer 2.5 Gallon Electric Water Heater
The Daordaer Mini Tank Heater is a compact solution for instant hot water needs. With a capacity of 2.5 gallons and a powerful 1.5 KW output, it heats water quickly, ensuring you won't have to wait long at the sink. You can easily adjust the temperature between 86°F and 149°F using a simple knob, allowing you to set the perfect warmth for your tasks. Its durable stainless steel construction ensures safety and longevity, while multiple safety features protect against potential hazards. Enjoy consistent hot water on demand, making your daily routines more comfortable and efficient.
Fisoceny 2.5 Gallon Instant Hot Water Heater
The Fisoceny Mini Hot Water Heater is designed for easy installation and versatile use, making it perfect for kitchens, offices, and more. With a rapid heating efficiency of 90%, you can enjoy hot water in just six minutes, even during cold winters. Its durable construction, featuring corrosion-resistant materials and stainless steel heating tubes, ensures long-lasting performance. Additionally, this compact unit boasts excellent energy efficiency and superior insulation, keeping hot water readily available when you need it. With user-friendly temperature controls, it offers convenience and comfort for your everyday needs.
OOOJS 8-Gallon Instant Electric Water Heater
The OOOJS Instant Water Heater is designed for convenient hot water access in areas lacking immediate hot water sources. It includes essential accessories like durable water pipes and a safety valve, ensuring a reliable installation. You can enjoy peace of mind with its robust stainless steel construction and multiple safety features, protecting you from potential hazards. This model also boasts intelligent energy-saving technology, heating water to your desired temperature quickly and efficiently, making it perfect for kitchens, RVs, and more.
Reliance Compact Electric Water Heater
The Reliance Compact Electric Water Heater is perfect for under counter or crawl space installation, with a 6-gallon capacity and a 6-year warranty. It features a single 120-volt 1650-watt copper heating element, as well as a side-mounted cold water inlet and hot water outlet for easy installation. The factory-installed Temperature and Pressure (T&P) relief valve ensures safety and peace of mind.
Agust Electric Hot Water Heater
The Agust Electric Hot Water Heater is a safe, durable, and long-lasting solution for your hot water needs. Made of 304 stainless steel, this mini tank storage is anti-leakage and corrosion-resistant. Equipped with a smart inverter for energy-saving, it features a digital display and automatic heat preservation, offering a thermal efficiency of 98% and maximum temperature of 167℉. With easy-to-operate knob temperature adjustment, vent valve, and tee pipeline, it is easy to use and install without additional expenses. The fast recovery rate eliminates long waits for hot water, and the compact design can be shelf, wall, or floor mounted.
Goyappin Tankless Water Heater 110V
The Goyappin Instant Hot Water Heater offers a quick and efficient solution for your hot water needs. With its powerful 5500W heating system, you can enjoy instant hot water within just 10 seconds, perfect for tasks like handwashing or making tea. This compact unit only uses energy when you need hot water, helping you save on energy bills while reducing your environmental footprint. Its small size allows for easy under-sink installation, maximizing your space. Plus, the user-friendly remote control and LED display make it simple to operate, even with wet hands.
thermomate Mini Tank Electric Water Heater ES250
The thermomate Mini Tank Electric Water Heater ES250 offers instant hot water with fast recovery, eliminating the wait time. It has a compact design for easy installation under the sink or counter, and can be wall or floor mounted. The Incoloy 800 Stainless Steel Heating Element is resistant to corrosion and has high heating efficiency. The Enamel Coating Glass-lined ensures better insulation and prevents leaking. It has CSA T&P Relief valve CASH USA made, UL certified ensuring a safe long service life. The temperature range is adjustable from 50°F to 149°F.
BN-LINK 2.7 Gallon Mini-Tank Water Heater
The BN-LINK Mini-Tank Heater is designed for quick and efficient hot water delivery. With its powerful 1440W output, you can enjoy hot water in no time, eliminating long waits. You can easily adjust the temperature from 86°F to 167°F, ensuring it meets your specific needs. Safety is a priority with features like Dry Combustion and Overheat Protection, giving you peace of mind while using it. Additionally, its energy-saving design minimizes heat loss, making it an eco-friendly option that helps reduce your utility bills.
Frequently Asked Questions (FAQs)
1. What is the smallest water heater size?
Frequently called a point-of-use or utility water heater, these units typically range in size from 2.5 to 19 gallons.
2. What are the small water heaters called?
A point of use (POU) hot water heater is a small water heater that is installed near the fixture it will supply.
3. Are under sink water heaters any good?
Under-sink water heaters are more energy-efficient than the traditional one, by using these water heaters you can cut down on your household energy consumption because they need less energy to heat the water and they don't need to heat up constantly to keep a large amount of water hot.
4. What size water heater do I need for a 1 bedroom apartment?
When all is said and done, here is what the math tells us should work for you: 1-2 people need a 30-gallon water heater. 2-3 people need a 40-gallon water heater. 3-4 people need a 40-50 gallon water heater.
During our compact water heater research, we found 24 compact water heater products and shortlisted 10 quality products. We collected and analyzed 21,718 customer reviews through our big data system to write the compact water heaters list. We found that most customers choose compact water heaters with an average price of $167.62.
The compact water heaters are available for purchase. We have researched hundreds of brands and picked the top brands of compact water heaters, including Ariston, BISELONG, Daordaer, Fisoceny, OOOJS. The seller of top 1 product has received honest feedback from 53 consumers with an average rating of 4.7.

Harry Stack owns a small hardware store, his career landed him a depth of knowledge in categories such as tools, equipment, machinery and hardware. In his spare time, he usually repairs furniture, safes and appliances, and he knows how to make simple repairs to plumbing or electrical fixtures. His hobbies also include woodworking and fishing.