20 Best Instant Hot Water Heater Under Sink (2022 Updated)

An instant hot water heater under sink is a small, tankless water heater that mounts under your kitchen sink. It provides hot water on demand, meaning you don’t have to wait for the water to heat up.

This is a great option for small homes or apartments where space is limited.

20 Best Instant Hot Water Heater Under Sink

1. Stiebel Eltron Tempra 36 Plus Whole House Electric Tankless Water Heater

Stiebel Eltron Tempra 36 Plus Whole House Electric Tankless Water Heater

  • 36 Plus Tankless

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Home Depot
TanklessKing
Wholesale Home

Product Details

Specifications

Details
Temperature (Minimum) 68° F
Temperature (Maximum) 140° F
Vent Type Vent Free
Amperage 150A
Voltage 240V

Reviews From Real Customers

ChristianMC
Sklewis
Brian Lackie

2. Rinnai RU199iN 199,000 BTU Indoor Natural GAS Tankless Water Heater

Rinnai RU199iN 199,000 BTU Indoor Natural GAS Tankless Water Heater

  • 150 PSI Temperature 98
  • 140 F Natural Gas Pressure 3.5
  • 10.5 WC Voltage 120V / 60hz / 4A Maximum Flow Rate 0.26 GPM Gas Input 15,000

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Amazon.com – Seller
Home Depot
Lowe’s
Big Frog Supply

Product Details

Specifications

Details
Fuel Type Liquid Propane (LP)
Fuel Type Natural Gas (NG)

Reviews From Real Customers

MJahn
Brian M.
motobojo4004

3. Stiebel Eltron Tempra 24 Trend Whole House Electric Tankless Water Heater

Stiebel Eltron Tempra 24 Trend Whole House Electric Tankless Water Heater

  • 24

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eBay – homedealss
Walmart
Tank The Tank

Product Details

Specifications

Details
Temperature (Minimum) 68° F
Temperature (Maximum) 140° F
Vent Type Vent Free
Amperage 100A
Voltage 240V

Reviews From Real Customers

Matt M
Key west FL
BandM

4. Rheem RTGH-RH11DVLN Prestige Series Natural GAS Condensing Tankless Water Heater with Built-in Recirculation

Rheem RTGH-RH11DVLN Prestige Series Natural GAS Condensing Tankless Water Heater with Built-in Recirculation

  • Exclusive Water Savings technology conserving up to 1, 100 gallons per year
  • 199, 000 BTU (gas consumed per hour)
  • Instant hot water
  • For use indoor only

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Amazon.com
SupplyHouse.com
Wholesale Water Heaters & More
TanklessKing

Product Details

Specifications

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

Reviews From Real Customers

AquatechP
Cathie and Michael D

5. Titan Electric Tankless Water Heater N-160

Titan Electric Tankless Water Heater N-160

  • N-160

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Amazon.com – Seller
Home Depot
Tank The Tank
The BuildClub

Product Details

Specifications

Details
Energy Star Certified Yes
Product Type Tankless Water Heater
Width 7 in.
Power Source Electric
Amps 66 amps

Reviews From Real Customers

FixitForTheKids
guidera48
hesh-3091

6. Ecosmart 27 Tankless Electric Water Heater

Ecosmart 27 Tankless Electric Water Heater

  • 27kw

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Walmart
Ace Hardware

Product Details

Specifications

Details
Assembled Depth (in) 3.75 in
Assembled Height (in) 18 in
Assembled Width (in) 17 in
Assembled Weight (lbs) 13.75 lbs
Item is Shipped at this Packaging Level Y

Reviews From Real Customers

Juan Carlos Garcia
Mario Consuegra
TheBoop

7. Marey ECO110 Electric Tankless Water Heater – 11kW

Marey ECO110 Electric Tankless Water Heater - 11kW

  • 11kw

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eBay
Walmart
Camping World

Product Details

Specifications

Details
Required Volt Connection 220 volt
Application Type Residential
Indoor/Outdoor Indoor
Efficiency Level Super High
Fuel Type Electric

Reviews From Real Customers

My T.
Ronnie R.
Sam

8. Rinnai Value 6.6 GPM Liquid Propane Tankless Water Heater – White

Rinnai Value 6.6 GPM Liquid Propane Tankless Water Heater - White

  • 6.5 Gpm / 150,000 Btu

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Amazon.com
Home Depot
Build.com
Big Frog Supply

Product Details

Specifications

Details
Fuel Type Liquid Propane (LP)
Fuel Type Natural Gas (NG)

Reviews From Real Customers

Ricky
Steve C
Greg Heyborne

9. Stiebel Eltron DHC-E 12 Electric Tankless Water Heater

Stiebel Eltron DHC-E 12 Electric Tankless Water Heater

  • Serves 2 sinks + 1 shower
  • Simple and secure operation
  • Easy and quick installation
  • Works even with low water pressure
  • Constant temperature up to the output limit

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Amazon.com
Wholesale Home
Tank The Tank
E-Tankless Water Heaters

Product Details

Specifications

Details
Vent Type Vent Free
Amperage 50A
Voltage 240V
Activation GPM 0.264
Maximum Flow Rate 2 GPM

Reviews From Real Customers

fgendreau
Tim the Toolman Taylor
bthes97

10. Rinnai V75IN 7.5 GPM Indoor Natural GAS Tankless Water Heater

Rinnai V75IN 7.5 GPM Indoor Natural GAS 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 up to 7.5 GPM hot water flow rate for a powerful, constant stream
  • Enhanced scale detection lessens possibility of serious, long-term damage to unit

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Amazon.com
eBay
Home Depot
Lowe’s

Product Details

Specifications

Details
Fuel Type Liquid Propane (LP)
Fuel Type Natural Gas (NG)

Reviews From Real Customers

paris2932
Boz
Atlanta Homeowner

11. Rinnai RL94iP Indoor Tankless Water Heater Propane

Rinnai RL94iP Indoor Tankless Water Heater Propane

  • ENERGY STAR qualified.
  • Energy factor of.
  • Built-in Rinnai Circ-LogicTM recirculation program cycles an external pump at pre-set intervals and temperatures to maximize efficiency and comfort.

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Amazon.com – Seller
Home Depot
Lowe’s
Ferguson

Product Details

Specifications

Details
Fuel Type Liquid Propane (LP)
Fuel Type Natural Gas (NG)

Reviews From Real Customers

alf24328
birdoger
ter28222

12. Rheem Performance 18 KW Self-Modulating 3.5 GPM Electric Tankless Water Heater

Rheem Performance 18 KW Self-Modulating 3.5 GPM Electric Tankless Water Heater

  • 18kw

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Amazon.com – Seller
eBay
Home Depot
BUYA.COM – Buya – Mid Valley Pawn

Product Details

Specifications

Details
Required Volt Connection 240 volt
Application Type Residential
Indoor/Outdoor Indoor
Fuel Type Electric
Number of Showers 1-2

Reviews From Real Customers

Louis Murray
jesse patterson
Ziggy Moo

13. Bosch Tronic 3000T Series ES Point-of-Use Tankless Water Heater – Electric – 7 gal

Bosch Tronic 3000T Series ES Point-of-Use Tankless Water Heater - Electric - 7 gal

  • 7 Gallon

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Amazon.com
eBay
Walmart – Online Supply Center
Home Depot

Product Details

Specifications

Details
Efficiency Level Super High
Water Heater Profile Compact
Nominal Tank Capacity (gallons) 7 gal
Amperage (amps) 12 A
Application Type Point of Use

Reviews From Real Customers

eben133
JDP
KJ Handyperson

14. Bosch Tronic Electric Tankless Water Heater US12

Bosch Tronic Electric Tankless Water Heater US12

  • 99% efficient with minimal stand-by loss
  • Ultra compact and lightweight, saving valuable space
  • Copper heat exchanger with copper-sheathed heating elements
  • No temperature/pressure relief valve is necessary (check local codes)
  • Max 1.5 GPM

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eBay
Home Depot
Grainger Industrial Supply

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 12,000

Reviews From Real Customers

gyi151
stpeteboyz8ys4
barbarevan-26

15. Ecosmart ECO18 Electric Tankless Water Heater – 18 KW – 240 V

Ecosmart ECO18 Electric Tankless Water Heater - 18 KW - 240 V

  • 18kw

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Ace Hardware

Product Details

Specifications

Details
Packaging Depth 6.25 IN
Packaging Height 19.5 IN
Packaging Width 16.25 IN
Package Weight 11
Package Weight UOM LB

Reviews From Real Customers

dennis3456
Matthew Easter
wbsmgparts

16. Stiebel Eltron Mini 3.5-1 Point-of-Use Electric Tankless Water Heater

Stiebel Eltron Mini 3.5-1 Point-of-Use Electric Tankless Water Heater

  • Extremely compact design saves space
  • Sleek design is appealing and can be mounted in plain sight
  • Unlimited supply of hot water
  • Major energy savings
  • Minimum flow to activate unit: 0.40 GPM

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Home Depot
WebstaurantStore.com
Wholesale Home

Product Details

Specifications

Details
Vent Type Vent Free
Wattage 3500W
Amperage 29A
Voltage 120V
Activation GPM 0.4

Reviews From Real Customers

milan7
Jeff P
Richard S.

17. Black & Decker 36 KW 6.1 GPM Electric Tankless Water Heater

Black & Decker 36 KW 6.1 GPM Electric Tankless Water Heater

  • 36 Kw

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Walmart
Lowe’s
Sam’s Club

Product Details

Specifications

Details
Hybrid Heat Pump Technology No
Maximum Gallons per Minute 6.2
Point of Use No
Bluetooth Compatibility No
Commercial/Residential Commercial/Residential

Reviews From Real Customers

jack d
Regina

18. Rinnai V65IN Indoor Natural GAS Tankless GAS Water Heater

Rinnai V65IN Indoor Natural GAS Tankless GAS Water Heater

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Lowe’s
Home Depot
SupplyHouse.com

Product Details

Reviews From Real Customers

arvidpodsim
henr_milet
PJ

19. Bosch WH17 Tankless Water Heater – Electric

Bosch WH17 Tankless Water Heater - Electric

  • CONVENIENT TANKLESS HOT WATER HEATER: 17.3 kW tankless whole house electric water heater provides hot water when needed, for as long as needed
  • EASY INSTALLATION: Can be installed virtually anywhere for commercial or residential applications
  • CONSISTENT TEMPERATURE: Polymer encased elements & built-in flow sensor ensures constant output temperature
  • STABILITY & CONTROL: External temperature control knob & superior temperature stability and control
  • GREAT EFFICIENCY: 97% thermal efficiency with minimal stand-by loss

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eBay
Home Depot
AF Supply

Product Details

Specifications

Details
Power Source Electric
Product Type Tankless Water Heater
Commercial or Residential Residential or Commercial
Amperage 80 are
Assembled Width 8-1/2 in.

Reviews From Real Customers

Friendly Lance
Becca

20. A.O. Smith Signature 240-Volt 28 Kilo-Watt 2.4-GPM Tankless Electric Water Heater

A.O. Smith Signature 240-Volt 28 Kilo-Watt 2.4-GPM Tankless Electric Water Heater

  • 240-Volt 28

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eBay – ecycle-techs
Lowe’s

Product Details

Specifications

Details
Point of Use No
Mobile Home Compatible Yes
Installation Location Wall mount
Smart Compatible No
Power Output (Kilowatts) 28.0

Reviews From Real Customers

Jcator
Valerie26
Ata94

Conclusion

The conclusion of an instant hot water heater under sink is that it is a great way to have hot water on demand without having to wait for a traditional water heater to heat up the water. This can be a great convenience for busy families or anyone who wants to have hot water without having to wait.

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