Updated: 17 Jul 2025

10 Best water heaters of 2025

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Updated: 17 Jul 2025

#1

Best Choice
Chromex Tankless Water Heater Flush Kit with Certified Liquid Descaling Solution and Right Angle Inlet Hoses & 1/6HP Extra Strength Pump

9.8

Chromex

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Main highlights

Works with most all tankless water heaters such as Rinnai, Bosch, Noritz, Rheem, Takagi, Tempra, Navien, Ecosmart, Stiebel, Eccotemp, Atmor, Trutankless, Marey Power, and others.

The right angle hoses allow you to easily attach the hoses to the tankless water heater with easier positioning.

6 Piece Tank-less Water Heater Flush Kit. Helps maintain and extend the lifespan of your tank-less water heater. Kit comes with 5 gallon bucket with lid, 1/6 HP Pump, 2 Steel Hoses, descaler solution, and an elevated pump grate.
#2

Value for Money
Airthereal Electric Tankless Water Heater, 27kW, 240Volts - Endless On-Demand Hot Water - Self Modulates to Save Energy Use - Small Enough to Install Anywhere - for 3 Showers, Evening Tide series

9.5

AIRTHEREAL

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Why we love it

Endless Hot Water

Save Space

Save Energy

Main highlights

☼Save Space: This wall-mounted water heater is perfect for saving space. It uses 90% less space than a traditional hot water heater with a tank, which means you can use the extra space for other things.

☼Save Energy: The self-modulating temperature technology only heats up water when you need it, which means you won't be wasting energy by storing hot water in a tank. You can save up to 50% on water heating energy compared to a typical tank water heater.

☼Endless Hot Water: Imagine being the last one in your family to take a shower before heading out for the day. You turn on the faucet and the water is freezing cold. With the Airthereal Electric Tankless Water Heater, you'll have endless hot water on demand with no preheating required. No more worrying about running out of hot water in the tank or experiencing temperature fluctuations in the middle of your shower.
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#3
Chromex Tankless Water Heater Flush Kit with Concentrated Vinegar, Dilutes to 4 Gallons and 1/6HP Extra Strength Pump

9.3

Chromex

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Main highlights

Our descaling kit is an ideal match for those who want to adhere to Rinnai and other manufacturer guidelines and ensure you maintain your appliance responsibly and effectively. Add 3 parts water for standard vinegar strength.

Maintain and extend the lifespan of your tankless water heater with our 5 Piece Tankless Water Heater Flush Kit. Kit includes 6 gallon bucket with lid, 1/6 HP Pump, PVC Coated Premium Hoses, Pump Grate, 20% concentrated vinegar. Bonus maintenance tag included.

6 Foot hoses easily connect to tankless heater valves, and the kit will clean most heaters in 30 minutes or less! Usage instructions are included as an info-graphic on this listing as well as with your kit.
#4
Rheem 18kW 240V Tankless Electric Water Heater, Gray

9.2

Rheem

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Why we love it

The water heater is controlled by a digital thermostat for accurate temperature control.

The water heater can modulate its power output to meet hot water demand, making it more efficient.

The water heater has two durable copper heating elements that can be replaced if necessary.

Main highlights

Most advanced self-modulation, adjust power to meet hot water demand

External digital thermostatic control with LED display (+/1 degree accuracy)

Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
#5
EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology

9.1

EcoSmart

-30%

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Why we love it

Small and saves space

Only heats water when needed very efficient

Comes with a lifetime warranty

Main highlights

Save Space; EcoSmart tankless electric water heaters are 90% smaller than traditional tank heaters; may be installed on wall or at point of use; Dimensions 11.5 x 8 x 3.75 inches

Save Energy; EcoSmart tankless electric water heaters are 99% thermal energy efficient; Only heats water when called unlike a tank heater that maintains water temperature even when not being used.

Endless On-Demand Hot Water; Consistent hot water when you need it that never runs out; Continuously monitored water temperature and controlled flow rates ensure efficiency and consistent performance within 1 degree of selected temperature.Amperage Draw : 54 A.Special Features: ‎Energy Efficient

-30%
#6
Immersion Water Heater,with 304 Stainless Steel Cover Intelligent Temperature Control and UL Certification Portable Bucket Heater Heat 5 Gallons of Water in Minutes

9.0

Lakkzoom

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Why we love it

Fast heating warms water in minutes

Safe automatic shut off prevents burns

Portable perfect for travel and road trips

Main highlights

Wide Range Of Applications:Our portable pool heater suitable for portable bathtub,mini pool(Using more than one),sink, bucket, washbasin,etc.Make sure the container can hold hot water when using it.This immersion heater is handy and super lightweight, making it perfect for travels and road trips.Note, it is not suitable for using in big swimming pool .WARNING：Environmental problems: The use of the Immersion Water Heater did not operate this appliance within 3 ft (1 m) of any structure,combustible material, or other gas cylinders which increase the risk of fire.

Safety design: UL certified instant water heater with high-quality stainless steel protective cover, effectively prevent heating elements from direct contact with humans or animals, rust resistant and durable. Our immersion water heaters are designed with intelligent temperature control and automatically cut off the power when the water temperature reaches 75 ° C (165°F).WARNING:When using, first put the water heater into the water, be sure to ensure that the water heater is fully immersed in water, and then plug in the socket. Determine the operation sequence to effectively prevent fire.

Fast Heating:1500W high-power electric water heater can heat up to 5 gallons of water in minutes. Heat dissipates to the water faster by flowing through the holes in the guard. The heater needs to be completely immersed in water in working condition. Please take out the immersion water heater before touching the water! WARNING: It is recommended not to use more than one hour, you need to quickly heat a lot of water can use more than one water heater at the same time, But never plug two water heaters into the same socket to avoid causing a fire.
#7
BOSCH Electric Mini-Tank Water Heater Tronic 3000 T 2.5-Gallon (ES2.5) - Eliminate Time for Hot Water - Shelf, Wall or Floor Mounted

8.9

BOSCH

-14%

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Why we love it

This water heater is great for small spaces and provides hot water on demand.

It is easy to install and can be mounted on a shelf, wall, or floor.

The recovery rate is fast, so you wont have to wait long for hot water.

Main highlights

LONG LASTING QUALITY: This electric water heater is easy to maintain and has premium glass-lined material for a long service life. (Amps 12A, Volts (VAC) 120)

INDEPENDENT INSTALLATION: 36-37" cord plugs into a 120 volt outlet for independent installation or in-line with a large hot water source

CONVENIENT HOT WATER HEATER: 2.5 gallon point-of-use mini-tank fits under your sink to provide hot water right where you need it. Thermal efficiency is 98%. Dimensions : 13.75 W x 13.75 H x 10.75 D Inches

-14%
#8
GE Appliances 10 Gallon Versatile Plug and Play Electric Water Heater with Adjustable Thermostat, Easily Installs Where You Want It, 120 Volt

8.8

GE

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Why we love it

Hot water where you need it

Takes up limited space

Easy to install

Main highlights

LEADING WARRANTY- 8- year limited replacement or 8-year tank and parts/1-year labor warranty for peace of mind

EASY INSTALLATION - Installs in minutes with existing plumbing. Uses standard 3/4-in NPT compatible water connections and connects into any 120-Volt supply

COMPACT DESIGN - Offers flexibility and space savings in places like kitchens, bathrooms, laundry rooms, RVs, cabins, barns, garages, etc
#9
CAMPLUX Tankless Water Heater Outdoor, 1.32 GPM Portable Propane Camping Water Heater, 5L, AY132, White

8.7

CAMPLUX ENJOY OUTDOOR LIFE

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Why we love it

Compact Portable: 10lb, folding handle

Easy Installation: 10 min setup

Fast Output: 1.32 GPM, max temp 114.8

Main highlights

Versatile Applications: The lowest water pressure at beginning for the water heater is 3.0 PSI. For off-grid and rural areas, this hot water generator powered by two size D batteries is ideal. No more chilly outdoor shower anymore.

Lightweight, Compact & Portable Design: The 10 pounds lightweight portable water heater's folding handle keeps it out of the way and enables easy setup outside.

Flow Rate & Temperature Specification: The temperature raise is 114.8℉ (46℃) at its highest point and 46.4℉ (8℃) is at its lowest point of 1.32 GPM. Also, 1.32 gallons of hot water can be produced per minute at the flow rate of 1.32 GPM.
#10
14kW Tankless Water Heater Electric, ORBEK 240 Volt On Demand Instant Hot Water Heater, with LED Digital Display, ETL Certified, Up to 3.38 GPM for 2-3 Point of Use

8.6

Orbek

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Main highlights

Note: Things to know before buying, Our Orbek tankless water heater electric 14kw requires a 240V/60AMP two-pole breaker, 1 set of 6 AWG wires and 1/2" NPT water connections

Instant Hot Water Supply: Orbek electric tankless water heater 240v can provides up to 3.38 GPM of on demand endless hot water and ensure comfortable hot water for 2-3 points of use simultaneously

High Energy Efficiency: This on demand hot water heater electric utilizes water-electricity separation to minimize scale and corrosion. It provides endless hot water in just 3 seconds with an impressive efficiency, potentially reducing electricity costs by up to 60% compared to traditional tank-style heaters

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10 Best water heaters of 2025

Chromex Tankless Water Heater Flush Kit with Certified Liquid Descaling Solution and Right Angle Inlet Hoses & 1/6HP Extra Strength Pump

9.8

Main highlights

Airthereal Electric Tankless Water Heater, 27kW, 240Volts - Endless On-Demand Hot Water - Self Modulates to Save Energy Use - Small Enough to Install Anywhere - for 3 Showers, Evening Tide series

9.5

Why we love it

Main highlights

Chromex Tankless Water Heater Flush Kit with Concentrated Vinegar, Dilutes to 4 Gallons and 1/6HP Extra Strength Pump

9.3

Main highlights

Rheem 18kW 240V Tankless Electric Water Heater, Gray

9.2

Why we love it

Main highlights

EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology

9.1

Why we love it

Main highlights

Immersion Water Heater,with 304 Stainless Steel Cover Intelligent Temperature Control and UL Certification Portable Bucket Heater Heat 5 Gallons of Water in Minutes

9.0

Why we love it

Main highlights

BOSCH Electric Mini-Tank Water Heater Tronic 3000 T 2.5-Gallon (ES2.5) - Eliminate Time for Hot Water - Shelf, Wall or Floor Mounted

8.9

Why we love it

Main highlights

GE Appliances 10 Gallon Versatile Plug and Play Electric Water Heater with Adjustable Thermostat, Easily Installs Where You Want It, 120 Volt

8.8

Why we love it

Main highlights

CAMPLUX Tankless Water Heater Outdoor, 1.32 GPM Portable Propane Camping Water Heater, 5L, AY132, White

8.7

Why we love it

Main highlights

14kW Tankless Water Heater Electric, ORBEK 240 Volt On Demand Instant Hot Water Heater, with LED Digital Display, ETL Certified, Up to 3.38 GPM for 2-3 Point of Use

8.6

Main highlights

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