Best Compact Water Heaters of 2025

Harry Stack Avatar
Harry Stack
Last Updated: Jan 3, 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

Ariston Andris 8 Gallon 120-Volt Point of Use Mini-Tank Electric Water Heater Cover #TOP 1
Ariston Andris 8 Gallon 120-Volt Point of Use Mini-Tank Electric Water Heater
ftb score rating icon 9.8
BISELONG 2.5 Gallon Electric Water Heater Cover #TOP 2
BISELONG 2.5 Gallon Electric Water Heater
ftb score rating icon 9.7
Daordaer 2.5 Gallon Electric Water Heater Cover #TOP 3
Daordaer 2.5 Gallon Electric Water Heater
ftb score rating icon 9.5

Top 10 Compact Water Heaters

#TOP 1

Ariston Andris 8 Gallon 120-Volt Point of Use Mini-Tank Electric Water Heater

ARI POU-8 120V 1500W
grey,black
8 Gallon
Ariston Andris 8 Gallon 120-Volt Point of Use Mini-Tank Electric Water Heater Cover
Ariston Andris Mini Tank Electric Water Heater – Heating Solution for Under Sink, RV, and Compact Spaces, Smart Boost for Versatile Heating, Simple Installation, 120-Volt, 8 Gallon Capacity

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.

What We Like
Easy installation
Compact design
Immediate hot water
TitanShield technology
6-year limited warranty

BISELONG 2.5 Gallon Electric Water Heater

BI-2.5
White
BISELONG 2.5 Gallon Electric Water Heater Cover
110V-120V 1440-1500W Small Under Sink Tank 2.5 Gallon Water Heater Hot Storage,Mini Instant Electric RV TR Trailer Kitchen Compact,Food Truck 2 PCs 16” Long 1/2”FIP Stainless Steel Hose (BI-2.5)

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.

What We Like
Easy to install
Temperature control
Compact size
Immediate hot water
Longer availability of hot water
#TOP 3

Daordaer 2.5 Gallon Electric Water Heater

YT175666
2.5 Gallon- White
Daordaer 2.5 Gallon Electric Water Heater Cover
DAORDAER 110/120v 1.5kw Mini Tank Electric Water Heater 2.5 Gallon Compact Under Sink Water Heater Knob Temperature Adjustment Instant Hot Water Heater For Home Kitchen (2.5 Gallon- White)

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.

What We Like
Fast heating capability
Temperature adjustable
Durable stainless steel design
Multiple safety protections
#TOP 4

Fisoceny 2.5 Gallon Instant Hot Water Heater

Fisoceny
White Instant water heater
White
Fisoceny 2.5 Gallon Instant Hot Water Heater Cover
Fisoceny Under Sink Instant Hot Water Heater 2.5 Gallon Mini Tank Water Heater 110V 120V Small Hot Water Heater,1500W Rv Compact Mini Water Heater Kitchen Mini Water Heater 1/2" NPT White

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.

What We Like
Quick hot water access
Durable, corrosion-resistant materials
Energy efficient operation
Compact space-saving design

OOOJS 8-Gallon Instant Electric Water Heater

OOOJS
JS-08
8.0Gallon
OOOJS 8-Gallon Instant Electric Water Heater Cover
110V-120V 1440-1500W Instant Electric Hot Water Heater Under Kitchen Small Tank 8.0 Gallon Storage,Rv Trailer Instant Fiberglass Compact Point-of-Use,2 PCs 16” Long 1/2”FIP Stainless Steel Hose 30L

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.

What We Like
Quick hot water access
Robust safety features
Energy-efficient operation
Easy installation
#TOP 6

Reliance Compact Electric Water Heater

Reliance
6-6-SOMS K
White
6 Gallon
Reliance Compact Electric Water Heater Cover
Reliance 6 6 SOMS K 6 Gallon 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.

What We Like
Easy to install with side-mounted cold water inlet and hot water outlet
Compact size perfect for under counter or crawl space installation
Comes with a factory-installed Temperature and Pressure relief valve for safety
#TOP 7

Agust Electric Hot Water Heater

Agust
AGU-001
White 3.0gallons
Agust Electric Hot Water Heater Cover
110V-120V 1.5Kw Instant Electric Hot Water Heater Under Kitchen Small Tank 2.5-3.0 Gallon Storage,Rv Trailer Instant Counter Compact Point-of-Use,2 PCs 16” Long 1/2”FIP Stainless Steel Water Hose 11L

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.

What We Like
304 stainless steel construction for long-lasting durability
Smart inverter for energy-saving and automatic heat preservation
Fast recovery rate and compact design for on-demand hot water
#TOP 8

Goyappin Tankless Water Heater 110V

Goyappin
LF-002A
White
Small
Goyappin Tankless Water Heater 110V Cover
Goyappin Tankless Water Heater Electric 110 V, Under Sink Instant Hot Water Heater Electric, Small Water Heater On Demand, Remote Control, Compact Size

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.

What We Like
Instant hot water supply
Energy efficiency
Compact design
User-friendly controls
#TOP 9

thermomate Mini Tank Electric Water Heater ES250

White
2.5 Gallon
thermomate Mini Tank Electric Water Heater ES250 Cover
Electric Mini Tank Water Heater UL Listed, thermomate 2.5 Gallons Small Under Sink Water Heater for Point of Use Instant Hot Water 110V 120V, Wall or Floor Mounted, 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.

What We Like
Instant hot water with fast recovery
Compact design for easy installation
Stainless Steel Heating Element for high heating efficiency
Enamel Coating Glass-lined for better insulation and prevention of leaking
Adjustable temperature range from 50°F to 149°F
#TOP 10

BN-LINK 2.7 Gallon Mini-Tank Water Heater

CP-C190
White
BN-LINK 2.7 Gallon Mini-Tank Water Heater Cover
BN-LINK Electric Mini-Tank Water Heater 2.7 Gallon Under Sink Water Heater, 1440W Point of Use Demand for Instant Hot Water 120V, Compact Tank for Space Saving, ETL Listed

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.

What We Like
Fast heating capability
Adjustable temperature control
Energy-efficient design
Compact size for small spaces
Safety features included
Buying Guide Image

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.

Editor's Notes

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.

Written by
Harry Stack Avatar

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.