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12 Best Under Sink Water Heater (2023 Updated)

Under sink water heaters are small, compact water heaters that are designed to be installed under a kitchen or bathroom sink. They are a great option for people who want to have hot water available without taking up a lot of space.

Under sink water heaters typically have a small tank that holds around 2-5 gallons of water. The water in the tank is heated to around 120 degrees Fahrenheit and is available on demand.

12 Best Under Sink Water Heater

Product Image Product Name Features Price

Bosch 4 gal. Mini-Tank Electric Water Heater

  • 4 gallon point-of-use mini-tank fits under your sink to provide hot water right where you need it
  • Electric water heater is easy to maintain and has glass-lined tank for long service life

Rinnai RUCS75IP 7.5 GPM Residential Indoor Liquid Propane Tankless Water Heater

  • Endless Hot Water: Enjoy unlimited hot water flow throughout the house; compact, durable, and easy to install; professional installation recommended

Rheem Prestige Condensing Tankless Indoor Liquid Propane Water Heater with Built in Recirculation 11.0 GPM – RTGH-RH11DVLP

  • 11 Gpm

Bosch T 4-Gallon Electric Mini-Tank Under Sink Water Heater ES4

  • Exactly what I wanted.
  • April 13 Purchased the four gallons tank instead of the two gallons.

Camplux Enjoy Outdoor Life Camplux 2.5 gal. Residential Point of Use Mini Tank Electric Water Heater

  • 2.5 Gallon

Eccotemp Em 2.5 Gallon Under Sink Electric Mini Hot Water Heater (2 Pack)

  • Designed to supply on-demand hot water to any faucet without the wait
  • Small, compact design is perfect for residential, commercial, and industrial use

Eemax SPEX3012T LavAdvantage Electric Tankless Water Heater

  • Water Heaters 3, 000 W, Amps.
  • Water Heaters 25 A, Voltage.
  • Water Heaters 120, Min. Flow Activation 0.2 gpm, Phase.

Eemax SPEX3012 FlowCo Electric Tankless Water Heater

  • 120 Volt

Bosch T 4-Gallon Electric Mini-Tank Under Sink Water Heater ES4

  • Exactly what I wanted.
  • April 13 Purchased the four gallons tank instead of the two gallons.
Bosch 4 gal. Mini-Tank Electric Water Heater
  • 4 gallon point-of-use mini-tank fits under your sink to provide hot water right where you need it
  • Electric water heater is easy to maintain and has glass-lined tank for long service life
Rinnai RUCS75IP 7.5 GPM Residential Indoor Liquid Propane Tankless Water Heater
  • Endless Hot Water: Enjoy unlimited hot water flow throughout the house; compact, durable, and easy to install; professional installation recommended
Rheem Prestige Condensing Tankless Indoor Liquid Propane Water Heater with Built in Recirculation 11.0 GPM – RTGH-RH11DVLP
  • 11 Gpm
Bosch T 4-Gallon Electric Mini-Tank Under Sink Water Heater ES4
  • Exactly what I wanted.
  • April 13 Purchased the four gallons tank instead of the two gallons.
Camplux Enjoy Outdoor Life Camplux 2.5 gal. Residential Point of Use Mini Tank Electric Water Heater
  • 2.5 Gallon
Eccotemp Em 2.5 Gallon Under Sink Electric Mini Hot Water Heater (2 Pack)
  • Designed to supply on-demand hot water to any faucet without the wait
  • Small, compact design is perfect for residential, commercial, and industrial use
Eemax SPEX3012T LavAdvantage Electric Tankless Water Heater
  • Water Heaters 3, 000 W, Amps.
  • Water Heaters 25 A, Voltage.
  • Water Heaters 120, Min. Flow Activation 0.2 gpm, Phase.
Eemax SPEX3012 FlowCo Electric Tankless Water Heater
  • 120 Volt
Bosch T 4-Gallon Electric Mini-Tank Under Sink Water Heater ES4
  • Exactly what I wanted.
  • April 13 Purchased the four gallons tank instead of the two gallons.

1. Bosch 4 gal. Mini-Tank Electric Water Heater

Bosch 4 gal. Mini-Tank Electric Water Heater

  • 4 gallon point-of-use mini-tank fits under your sink to provide hot water right where you need it
  • Electric water heater is easy to maintain and has glass-lined tank for long service life
  • 36-37″ cord plugs into a 120 volt outlet for independent installation or in-line with a large hot water source
  • Fast recovery rate eliminates long waits for hot water at your sink

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Amazon.com
eBay
Walmart – Online Supply Center
Home Depot

Product Details

Specifications

Details
Recovery at 90 Degree Rise (gph.) 6.8

Reviews From Real Customers

medw6591
4271roxrd
campingkeystone1

2. Rinnai RUCS75IP 7.5 GPM Residential Indoor Liquid Propane Tankless Water Heater

Rinnai RUCS75IP 7.5 GPM Residential Indoor Liquid Propane Tankless Water Heater

  • Endless Hot Water: Enjoy unlimited hot water flow throughout the house; compact, durable, and easy to install; professional installation recommended
  • Energy and Space Efficient: Space-saving design conserves energy as it heats only when necessary
  • Optimal Water Pressure: High-performance 7.5 GPM hot water flow rate for a powerful, constant stream
  • Multiple venting options available including PVC/CPVC using the Ubbink Concentric to Twin Pipe adaptor allow for an easy installation

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Amazon.com
Home Depot
SupplyHouse.com
Supply Online

Product Details

Specifications

Details
Weight 57.3 oz

Reviews From Real Customers

sam39405
leo38937
alt37889

3. Rheem Prestige Condensing Tankless Indoor Liquid Propane Water Heater with Built in Recirculation 11.0 GPM – RTGH-RH11DVLP

Rheem Prestige Condensing Tankless Indoor Liquid Propane Water Heater with Built in Recirculation 11.0 GPM - RTGH-RH11DVLP

  • 11 Gpm

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Amazon.com
TanklessKing
Rheem Tankless Online
Compact Appliance

Product Details

Specifications

Details
Fuel Type Liquid Propane
Water Connection 3/4″
Voltage 120V
Amperage 2A
Activation GPM 0.5

Reviews From Real Customers

AquatechP
Cathie and Michael D

4. Bosch T 4-Gallon Electric Mini-Tank Under Sink Water Heater ES4

Bosch T 4-Gallon Electric Mini-Tank Under Sink Water Heater ES4

  • Exactly what I wanted.
  • April 13 Purchased the four gallons tank instead of the two gallons.

Check Latest Price

Sold By Price
Amazon
SupplyHouse.com

Product Details

Specifications

Details
Capacity (Gallons) 4
Water Connection 1/2″
Connection Type Male Threaded
Recovery 90°F Rise 6.8
Efficiency 98%

Reviews From Real Customers

psem3288
robcarolina108
ron764077

5. Camplux Enjoy Outdoor Life Camplux 2.5 gal. Residential Point of Use Mini Tank Electric Water Heater

Camplux Enjoy Outdoor Life Camplux 2.5 gal. Residential Point of Use Mini Tank Electric Water Heater

  • 2.5 Gallon

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Sold By Price
Amazon
Home Depot
Overstock.com

Product Details

Specifications

Details
Water Heater Profile Compact
Efficiency Level Super High
Fuel Type Electric
Nominal Tank Capacity (gallons) 3 gal
Amperage (amps) 12 A

Reviews From Real Customers

Billsssss
edisoncomputers
westernspecial

6. Bosch Ariston ES2.5 Point of Use 2.5 Gallon Mini Tank Under Counter Water Heater

Bosch Ariston ES2.5 Point of Use 2.5 Gallon Mini Tank Under Counter Water Heater

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Amazon
Sears
Neobits.com

Product Details

Reviews From Real Customers

Tom in NH
The Soundman

7. Eccotemp Em 4 Gallon Under Sink Electric Mini Tank Hot Water Heater (2 Pack)

Eccotemp Em 4 Gallon Under Sink Electric Mini Tank Hot Water Heater (2 Pack)

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Amazon
VMInnovations

Product Details

Specifications

Details
Tank volume 4 gallons
Heating capacity 1440 Watts
Temperature range 50 to 140 degrees F
Voltage 110/120
Amps 12

Reviews From Real Customers

pitt1877.pkqy2
shubn.shubn
007mike770

8. Bosch US7 Tronic 3000 C Under Sink Electric Tankless Water Heater

Bosch US7 Tronic 3000 C Under Sink Electric Tankless Water Heater

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Amazon
Cozplan

Product Details

Specifications

Details
GPM Output @ Temperature Rise of 35°F 1.4
GPM Output @ Temperature Rise of 45°F 1.1
GPM Output @ Temperature Rise of 55°F 0.9
GPM Output @ Temperature Rise of 65°F 0.8
GPM Output @ Temperature Rise of 75°F 0.7

Reviews From Real Customers

rdb1946
4scrubs4
jwoo97963

9. Eccotemp Em 2.5 Gallon Under Sink Electric Mini Hot Water Heater (2 Pack)

Eccotemp Em 2.5 Gallon Under Sink Electric Mini Hot Water Heater (2 Pack)

  • Designed to supply on-demand hot water to any faucet without the wait
  • Small, compact design is perfect for residential, commercial, and industrial use
  • Able to supply hot water to 2 or more sinks
  • Easy-access temperature controls for hassle-free use
  • Water pressure operates at a maximum of 150 PSI

Check Latest Price

Sold By Price
Amazon
VMInnovations

Product Details

Specifications

Details
Tank volume 4 gallons
Heating capacity 1440 Watts
Temperature range 50 to 140 degrees F
Voltage 110/120
Amps 12

Reviews From Real Customers

sekjr3bxq
reechy99

10. Eemax SPEX3012T LavAdvantage Electric Tankless Water Heater

Eemax SPEX3012T LavAdvantage Electric Tankless Water Heater

  • Water Heaters 3, 000 W, Amps.
  • Water Heaters 25 A, Voltage.
  • Water Heaters 120, Min. Flow Activation 0.2 gpm, Phase.
  • Water Heaters 1, Temp. Range.
  • Water Heaters 70 Degrees to 140 Degrees F, Water Connection 3/8 in Compression, Temp.

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Amazon
eBay
Home Perfect
Zoro

Product Details

Specifications

Details
Item – Water Heaters Electric Tankless Water Heater
Water Heater Design Point-of-Use
Water Heater Application Undersink
Commercial / Residential Both
Watts – Water Heaters 3000

Reviews From Real Customers

Ferguson
noe.vicke
asharog

11. Eemax SPEX3012 FlowCo Electric Tankless Water Heater

Eemax SPEX3012 FlowCo Electric Tankless Water Heater

  • 120 Volt

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Sold By Price
Amazon
eBay
SupplyHouse.com
Big Frog Supply

Product Details

Specifications

Details
Amperage 25 A
Voltage 120 V
Kilowatts 3 kW
Fuel Type Electric
Water Connection 3/8″

Reviews From Real Customers

birdman4444f40
nationsproperty

12. Bosch T 4-Gallon Electric Mini-Tank Under Sink Water Heater ES4

Bosch T 4-Gallon Electric Mini-Tank Under Sink Water Heater ES4

  • Exactly what I wanted.
  • April 13 Purchased the four gallons tank instead of the two gallons.

Check Latest Price

Sold By Price
Amazon
SupplyHouse.com

Product Details

Specifications

Details
Capacity (Gallons) 4
Water Connection 1/2″
Connection Type Male Threaded
Recovery 90°F Rise 6.8
Efficiency 98%

Conclusion

There are many things to consider when selecting an under sink water heater. The size and capacity of the unit, the source of power, the warranty, and the price are all important factors.

Under sink water heaters come in a variety of sizes and capacities. The size of the unit will determine the amount of hot water it can produce and the size of the tank. The capacity of the unit will determine the amount of time it takes to heat the water.

The source of power for the under sink water heater is another important consideration. Units can be powered by electricity, natural gas, or propane. Each type of power has its own set of pros and cons.

The warranty is another important factor to consider when selecting an under sink water heater. Most units come with a one-year warranty. Some companies offer extended warranties for an additional cost.

The price of the under sink water heater is the final consideration. Units range in price from a few hundred dollars to several thousand dollars. Select the unit that fits your budget and needs.

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