Top 30 Whole House Water Heaters on Amazon (Verified You can Buy)
Top 1
Best for 80 Gallon
Best for Stiebel Eltron
Best for EcoSmart
Best for 4 GPM
Best for 12 GPM
Best for 14 GPM
18kW Tankless Water Heater Electric 240V WINTEMP, On Demand Instant Hot Water Heater, Up to 4.3 GPM, with LED Temperature Display, Whole House Hot Water Supply, WiFi Control, ETL Certified
WINTEMP
WN18
19.1 x 11.1 x 4.0 inches
12.0 Pounds
Ratings for WINTEMP (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| WINTEMP | - | ❌ | ❌ | ❌ |
Features
Important Note: Ensure this tankless water heater meets your installation requirements, 150 Amp Household Service Recommended. The WN18 model is rated at 18KW (240V) with a maximum amperage of 75A. It requires 2 x 40 Amp DP breakers and 2 x 8/2 AWG wiring with ground. The unit dimensions are 11.1” (W) x 19.1 ” (H) x 4” (D), the water connection is 3/4" NPT, Please consult a qualified electrician before purchasing
Stable Water Temperature: Automatically adjusts energy consumption based on incoming water temperature and flow rate to ensure maximum efficiency, continuous stable temperature, and optimal power usage. Its maximum hot water output is 4.3 gallons per minute. It is perfect for residential shower use, eliminating the need to wait for preheating. There’s no longer any concern about running out of hot water in the tank, and you won’t experience temperature fluctuations during your shower. Provides continuous hot water for showers and everyday household use
Top 2
Tankless Electric Hot Water Heater Set, 4500W 110V Under Sink On Demand Instant Hot Water Heater LED Screen Display Water Heater- Fault Self-Test Function-for 0.02-0.6Mpa, RV, Whole House (Blue)
Beuioslyr
Beuioslyr
2.24 x 2.24 x 10.91 inches
Ratings for Beuioslyr (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| FFBCXSI | - | ❌ | ❌ | ❌ |
Features
【Work Stably】: It is suitable for water pressure of 0.02-0.6Mpa, so it can work stably even under low water pressure, allowing users on higher floors to enjoy a comfortable shower experience.
【High Efficiency】: It has a high power of 4.5kw and can heat water efficiently, evenly, and permanently. Meanwhile, it adopts a stainless steel inner liner for heating to provide you with hot water in about 5-10 seconds, saving you lots of time and effort.
Top 3
Electric Tankless Water Heater SIVUATEK 18kW, 240V - On-Demand Hot Water for Whole House - ETL Certified, Self Modulating - Compact Design for Easy Installation - for 3 Point of Use Hot Water
SIVUATEK
V7B-180B
15.0 x 11.0 x 3.0 inches
19.0 Pounds
Ratings for SIVUATEK (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| SIVUATEK-US | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
【Electric Tankless Water Heater】The V7B-180B is compact design for point of use anywhere, in the meanwhile it is able to provide luxury & endless hot water up to 4.3GPM with its powerful 18kW heating system. It is great idea to install this tankless water heater electric a few ft away from shower tub or washing machine, to get sufficient and endless hot water of higher than 120℉ in seconds.
【Smart Tankless Water Heater】Tankless water heater electric V7B-180B wastes no energy for preheating like tank water heater, instead, this instant water heater adjusts power input based on real time flow rate and temp setting, thus, no fluctuation out of it even when flowrate changes, which commits comfortable experience, safety and optimal energy efficiency of 99.8%, saving up to 50% on water heating cost.
Top 4
Best for Tanked
Best for 2 GPM
Best for 3 GPM
Best for 7 GPM
Best for 8 GPM
Best for 9 GPM
Best for 10 GPM
Best for 11 GPM
Electric Tankless Water Heater WINTEMP 27kW 240V, Whole House Hot Water Supply, On Demand Instant Endless Water Heater, with LED Temperature Display, WiFi Control, Up to 6.3 GPM, ETL Certified
WINTEMP
WN27
11.0 x 11.0 x 19.1 Inches
12.7 Pounds
Ratings for WINTEMP (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| WINTEMP | - | ❌ | ❌ | ❌ |
Features
Important Note: Ensure this tankless water heater meets your installation requirements, 200 Amp Household Service Recommended. The WN27 model is rated at 27KW (240V) with a maximum amperage of 113A. It requires 3 x 40 Amp double-pole (DP) breakers and 3 x 8/2 AWG wiring with ground, with a recommended 250A household power supply. The unit dimensions are 11.1” (W) x 19.1 ” (H) x 4” (D), the water connection is 3/4" NPT, Please consult a qualified electrician before purchasing
Stable Water Temperature: Automatically adjusts energy consumption based on incoming water temperature and flow rate to ensure maximum efficiency, continuous stable temperature, and optimal power usage. Its maximum hot water output is 6.5 gallons per minute. It is perfect for residential shower use, eliminating the need to wait for preheating. There’s no longer any concern about running out of hot water in the tank, and you won’t experience temperature fluctuations during your shower. Provides continuous hot water for showers and everyday household use
Top 5
Best for Rheem
Best for Inline
Best for Tanked
Best for Electric
Best for Rheem
Best Tankless Water Heaters
Best for Takagi
Best for Noritz
Best for Rheem
Best for Rinnai
Best for EcoSmart
Best for FOGATTI
Best for Eccotemp
Best for AO Smith
Best for 2 GPM
Best for 3 GPM
Best for 4 GPM
Best for 5 GPM
Best for 6 GPM
Best for 7 GPM
Best for 8 GPM
Best for 9 GPM
Best for 10 GPM
Best for 11 GPM
Best for 12 GPM
Best for 14 GPM
Best for 15 GPM
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
Rheem
RTEX-24
18.25 x 14.5 x 3.5 Inches
17.8 Pounds
Ratings for Rheem (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ✅ | ✅ | ✅ |
| GM Not Mo | - | ✅ | ✅ | ✅ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
| Sunny ING | - | ❌ | ❌ | ❌ |
| Nantek | - | ❌ | ❌ | ❌ |
| Columbiatradestock (S/N Info Recorded) | - | ❌ | ❌ | ❌ |
| Trena's Liquidation LLC | - | ❌ | ❌ | ❌ |
| MTL Retailers | - | ❌ | ❌ | ❌ |
Features
ON/OFF Dial Control with adjustable digital temperature display
Self-modulating power control
Top 6
Best for Inline
Best for Tanked
Best for Gas Powered
Best for NG
Best for Indoor
Best for Propane
Best Gas Water Heaters
Best for 30 Gallon
Best for 40 Gallon
Best for 50 Gallon
Best for 60 Gallon
Best for 75 Gallon
Best for 80 Gallon
Best for Tankless
Best for 40 Gallon
Best for 80 Gallon
Best Tankless Water Heaters
VEVOR Tankless Water Heater Gas, 4.3Gal Instant Water Heater, 100000 BTU, Silver Gray, Smart Temperature Control, Multiple Security Protections, Indoor Use for Whole House
VEVOR
JSQ30-A
13.78 x 13.78 x 21.65 inches
19.75 Pounds
Ratings for VEVOR (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
Enjoy Instant Hot Water: This 4.3Gal, 100,000 BTU/h tankless water heater powered by gas, lets you and your family say goodbye to cold water and enjoy constant, comfortable hot water for showers and more
±1℉ Precision Temperature Control: Smart sensors maintain the water temperature within ±1℉ of the set value, avoiding large fluctuations and ensuring a consistent and comfortable water temperature
Ranein 18kW Electric Tankless Water Heater, 240V On Demand Instant Endless Water Heater with LED Temperature Display, Control Knob, Space Saving Design, Up to 4.3 GPM for Whole House Water
Ranein
RE18K
13.8 x 13.8 x 18.7 inches
17.4165 Pounds
Ratings for Ranein (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Ranein Store | - | ❌ | ❌ | ❌ |
Features
𝐈𝐦𝐩𝐨𝐫𝐭𝐚𝐧𝐭: This 18 kW, 240 V tankless electric water heater requires 2 dedicated 240 V circuits (2 × 40 A double-pole breakers and 2 × 8 AWG cables). Product dimensions: 13.8" × 3.1" × 18.7". Water connection: 3/4" NPT.
𝐏𝐨𝐰𝐞𝐫𝐟𝐮𝐥 𝐏𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞: With 99% thermal efficiency and a maximum flow rate of 4.3 GPM, this 18 kW tankless water heater can support 2–3 household water outlets simultaneously. Enjoy continuous hot water for showers, sinks, or dishwashing without waiting for a storage tank to heat up.
Top 8
Best for Inline
Best for Electric
Best for NG
Best for Compact
Best for Digital
Best for Mini
Best for Outdoor
Best for Thermostat
Best for Under Sink
Best for Wall
Best for Residential
Best for High Efficiency
Best for 120 Volt
Best for 10 Gallon
Best for 60 Gallon
Best for 80 Gallon
Best for 100 Gallon
Best Tankless Water Heaters
Best for Takagi
Best for Noritz
Best for Stiebel Eltron
Best for EcoSmart
Best for FOGATTI
Best for GASLAND
Best for Eccotemp
Best for AO Smith
Best for 2 GPM
Best for 7 GPM
Best for 9 GPM
Best for 11 GPM
Best for 12 GPM
Best for 14 GPM
Best for 15 GPM
110V Tankless Water Heater Electric, 3000W Tankless Electric Water Heater Instant, Under Sink Water Heater with Digital Display, On Demand Hot Water Heaters Electric for Kitchen Washin Bathroom.
xwdzswgs
Tankless Water Heater
4.32 x 4.32 x 7.86 Inches
Ratings for xwdzswgs (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| liuyiliang7788 | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
Tankless Electric Water Heater - This electric tankless water heater uses stainless steel and ABS materials, LED display. With 3000W power, the electric water heater tankless can raise the water by 82° F(0.3GPM) -131° F(0.5GPM) in seconds. The instant water heater can set Fahrenheit or Celsius degrees by holding the power button for 6 seconds. This 110 volt electric tankless hot water heater uses advanced technology, no need to preheat, eliminating the long waiting time for hot water!
Safety Intelligence Reliable - This instant hot water heater has multiple protection functions. IPX4 waterproof, water and electricity isolation, leakage protection, dry boil protection, and automatic power off under overheating and inactivity. On demand water heater with LCD digital display, intelligent detection of working status, and performance. The thermal efficiency of electric hot water heater is as high as 98%, allowing you to enjoy hot water at any time and save energy.
Top 9
Best for Stiebel Eltron
Best for Inline
Best Tankless Water Heaters
Best for Stiebel Eltron
Best for EcoSmart
Stiebel Eltron Tankless Water Heater – Tempra 24 Trend – Electric, 24kW, On Demand Hot Water, Eco, White, Made in Germany
Stiebel Eltron
24 Trend
4.63 x 16.63 x 14.5 Inches
16.1 pounds
Ratings for Stiebel Eltron (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| MTL Retailers | - | ❌ | ❌ | ❌ |
| Amazon.com | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
CONTINOUS FLOW – Hot showers will never be interrupted again. Enjoy continuous, on-demand hot water with an unlimited supply, when you want it without wasting any energy when not needed
SPACE & ENERGY SAVER – Its small, sleek white design saves space yet still provides endless hot water for your whole house, and no venting is required. Eco friendly unit saves energy with auto-modulation
Top 10
Best for EcoSmart
27kW Tankless Water Heater Electric 240V, Whole House, Gray
SIVUATEK
TSB-270
12.2 x 12.2 x 17.26 inches
Ratings for SIVUATEK (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| SIVUATEK-US | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
【PLEASE NOTE BEFORE PURCHASE】Ensure this 27kW 240V tankless electric water heater meets your hot water demand. Requires 3 x 40-amp circuit breaker. Unit dimensions: 15.87"x11.14"x2.87"; standard 3/4" NPT water connection.
【ENERGY-SAVING & EFFICIENT】Eliminate standby energy loss with our electric tankless water heater —no preheating, zero idle power use. Reduce your water heating costs by up to 50% compared to traditional models. Compact and space-saving, it installs flexibly under-sink or on-wall.
Top 11
Best for Rheem
Best for Inline
Best for Tanked
Best for Rheem
Best for 20 Gallon
Best for 50 Gallon
Best Tankless Water Heaters
Best for Takagi
Best for Noritz
Best for Rheem
Best for Rinnai
Best for EcoSmart
Best for FOGATTI
Best for Eccotemp
Best for AO Smith
Best for 2 GPM
Best for 5 GPM
Best for 7 GPM
Best for 9 GPM
Best for 11 GPM
Best for 12 GPM
Best for 14 GPM
Best for 15 GPM
Rheem 18kW 240V Tankless Electric Water Heater
Rheem
RTEX-18
18.5 x 14.5 x 3.5 inches
14.78 Pounds
99.8%
Ratings for Rheem (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Miami Water Heater | - | ✅ | ✅ | ✅ |
| CARESAN | - | ✅ | ✅ | ✅ |
| CASA CAYOS | - | ✅ | ✅ | ✅ |
| Amazon.com | - | ✅ | ✅ | ✅ |
| Trena's Liquidation LLC | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
| Mega Mart Warehouse | - | ❌ | ❌ | ❌ |
| PEACHSTATESTEALSANDDEALS | - | ❌ | ❌ | ❌ |
| MTL Retailers | - | ❌ | ❌ | ❌ |
Features
External digital thermostatic control with LED display (+/1 degree accuracy)
Most advanced self-modulation, adjust power to meet hot water demand
Top 12
Best for Gas Powered
Natural Gas Tankless Water Heater, Max 3.6 GPM, 85,000 BTU Indoor Installation, On Demand Instant Hot Water Heater, 2-3 Points Whole House, Within 1℉ Stable Temp, Multi-Protection, 1/2" NPT Connector
QERPRE
3.6GPM,Natural Gas
14.2 x 14.2 x 22.0 Inches
24.1009 Pounds
Ratings for QERPRE (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| HM-XUXI | - | ❌ | ❌ | ❌ |
Features
Endless Hot Water for Whole House: The QERPRE tankless water heater gas delivers powerful 85,000 BTU with a 3.6 GPM flow rate, ensuring continuous hot water for 2-3 water points like bathrooms, kitchens, and wet bars. Ideal for households requiring reliable, energy-conscious solutions without preheating delays
Stable Temperature Control: Adopting V3.0 Self-Modulating Temperature System, the gas tankless water heaters precisely keeps water temperature stable ±1℉ for a comfortable shower experience. The segmented burner ensures consistent comfort, no matter it’s a chilly winter or a hot summer
Top 13
Best for Gas Powered
Best for LP
Best for Indoor
Best for Propane
Best for Boiler
Best for 30 Gallon
Best for 50 Gallon
Best for 60 Gallon
Best for 80 Gallon
Best for 30 Gallon
Best for AO Smith
VEVOR Tankless Water Heater Propane, 4.3Gal Instant Water Heater, 100000 BTU, Silver Gray, Smart Temperature Control, Multiple Security Protections, Indoor Use for Whole House
VEVOR
JSQ30-B
13.78 x 13.78 x 21.65 inches
19.75 pounds
Efficient
Ratings for VEVOR (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ❌ | ❌ | ❌ |
Features
Enjoy Instant Hot Water: This 4.3Gal, 100,000 BTU/h tankless water heater powered by propane, lets you and your family say goodbye to cold water and enjoy constant, comfortable hot water for showers and more
±1℉ Precision Temperature Control: Smart sensors maintain the water temperature within ±1℉ of the set value, avoiding large fluctuations and ensuring a consistent and comfortable water temperature
Top 14
Best for Inline
Best for Indoor
Best for Residential
Best for High Efficiency
Best Gas Water Heaters
Best for 30 Gallon
Best for 40 Gallon
Best for 50 Gallon
Best for 60 Gallon
Best for 75 Gallon
Best for 80 Gallon
Best for Tankless
Best for 50 Gallon
Best for 2 GPM
Best for 5 GPM
Best for 7 GPM
ThermoMate CZ422NG Natural Gas Tankless Water Heater, Up to 5 GPM 113,000 BTU, High Efficiency Instant On-Demand Hot Water for Whole House Use, Indoor Residential Water Heater with Multi-Point Heating
thermomate
CZ422NG
13.77 x 13.77 x 21.65 Inches
22.0 Pounds
0.81 UEF
Ratings for thermomate (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| ThermoMate Official | - | ❌ | ❌ | ❌ |
Features
[Max 5 GPM & 113,000 BTU] - The ThermoMate instant hot water heater can supply two showers simultaneously, each delivering 105°F water at a flow rate of 2 GPM, based on an inlet water temperature of 65°F. No waiting time, no cold water shocks, perfect for busy households. Adopting advanced water flow sensor, the built-in chip can adjust the heating power 20,000 times per second, ensuring that the hot water within ±1℉ fluctuations for a comfortable shower experience.
[Safety & Reliable] - This gas tankless water heater integrates 8 protections: boil-dry, freeze, flame-out, overheating, over-temperature, pipe blockage, high-temperature lock, and excessive air pressure. Equipped with 4 ceramic heating cores, it auto-activates frost protection when temperatures hit 41°F (5℃). The energy-smart system uses minimal electricity to generate gentle warmth, preventing pipe ice buildup without high energy costs.
Top 15
Best for 2 GPM
Best for 4 GPM
Best for 5 GPM
Best for 7 GPM
Best for 8 GPM
Best for 9 GPM
Best for 10 GPM
WINTEMP 36kW Tankless Electric Water Heater 240V, Instant On-Demand Endless Hot Water, Up to 8.7 GPM, LED Temperature Display, Whole House Supply, WiFi Control, ETL Certified
WINTEMP
WN36
13.7 x 13.7 x 21.1 inches
36.05 pounds
Ratings for WINTEMP (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| WINTEMP | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
Important Note: Please ensure this tankless water heater meets your installation requirements, 300 Amp Household Service Recommended. The WN36 model is rated at 36KW (240V) with a maximum current draw of 150A. It requires 4 x 40 Amp double-pole (DP) breakers and 4 x 8/2 AWG cables with ground. A 300A household power supply is recommended. Unit dimensions: 13.7” (W) x 21.1” (H) x 5.3” (D). Water connection: 3/4" NPT, Please consult a qualified electrician before purchasing
Stable Water Temperature: Automatically adjusts energy consumption based on incoming water temperature and flow rate to ensure maximum efficiency, a consistently stable temperature, and optimal power usage. With a maximum hot water output of 8.7 gallons per minute, it’s ideal for residential showers — no need to wait for preheating, no risk of running out of hot water, and no more temperature fluctuations during your shower. Provides continuous hot water for showers and everyday household use
Top 16
Best for Gas Powered
Best for High Efficiency
Best for 50 Gallon
Best for 75 Gallon
Best for Rinnai
Best for 5 GPM
Best for 7 GPM
MIZUDO Natural Gas Tankless Water Heater, 199,000 BTU, Indoor Installation, Max 10.3 GPM, WiFi&APP Control, Non Condensing, High Efficiency for Large Families Residential Whole House
MIZUDO
WCIU-HW199A1G-NG-M0
15.9 x 15.9 x 24.8 inches
55.5 Pounds
Ratings for MIZUDO (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Mizudo Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
[Professional 199k BTU Tankless Water Heater]: Experience uninterrupted hot water delivery with 10.3 GPM flow capacity, designed to support large households with 5-7 fixtures simultaneously, providing hot water only when needed, making it an economically smart choice
[Smart WiFi Connectivity for Remote Management]: Control and monitor your gas tankless water heater from anywhere using the dedicated mobile application. Adjust temperature settings, create custom schedules, receive maintenance alerts, and track energy usage through your smartphone
Ranein 8kW Tankless Electric Water Heater, 240V on Demand Instant Endless Thermostatic Water Heater with LED Temperature Display for Bathroom and Kitchen sink
Ranein
RE8K-U (8kW)
9.06 x 9.06 x 6.7 inches
Ratings for Ranein (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Ranein Store | - | ❌ | ❌ | ❌ |
Features
Note: Make sure this on-demand electric water heater is sized for your hot water needs: 8 kW; 240 volts, circuit breaker required: 1 × 40 amps; unit dimensions: 9.06" × 6.7" × 2.34"; water connection: 1/2" NPT.Note: No need to disassemble the housing for wiring.
Save: Compared to tank-type water heaters, tankless water heaters don’t require preheating. There’s no energy consumption when not in use. It saves 60% of heating costs. Additionally, it’s more compact and can be installed anywhere.
Top 18
Best for Rheem
Best for Inline
Best for Tanked
Best for Electric
Best for NG
Best for Thermostat
Best for Rheem
Best for 10 Gallon
Best Tankless Water Heaters
Best for Takagi
Best for Noritz
Best for Rheem
Best for EcoSmart
Best for FOGATTI
Best for Eccotemp
Best for AO Smith
Best for 2 GPM
Best for 4 GPM
Best for 5 GPM
Best for 7 GPM
Best for 8 GPM
Best for 9 GPM
Best for 10 GPM
Best for 11 GPM
Best for 12 GPM
Best for 14 GPM
Best for 15 GPM
Rheem 11kW 240V Tankless Electric Water Heater
Rheem
RTEX-11
12.63 x 8.25 x 3.63 Inches
7.0548 pounds
99,8%
Ratings for Rheem (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ✅ | ✅ | ✅ |
| Plumber's Paradise | - | ✅ | ✅ | ✅ |
| CASA CAYOS | - | ✅ | ✅ | ✅ |
| AXY Co | - | ✅ | ✅ | ✅ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
| Trena's Liquidation LLC | - | ❌ | ❌ | ❌ |
| MTL Retailers | - | ❌ | ❌ | ❌ |
| Vertex Harbor | - | ❌ | ❌ | ❌ |
Features
ON/OFF Dial Control with adjustable digital temperature display
Self-modulating power control
Westinghouse Wifi Tankless Water Heater Electric,24kW 240V,Whole House,Gray
Westinghouse
WET-24K-G
12.99 x 12.99 x 17.05 inches
17.0 pounds
Ratings for Westinghouse (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Westinghouse Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
【Important Note】The APOLO-on demand hot water heater electric has a maximum flow rate of 5.55 GPM. Starting flow rate: 0.79 GPM. Current: 100A. This product can be used with 3 X 40 AMP (DP) breakers and 3 X 8 AWG wire. Bottom 3/4-inch NPT water connection. Voltage: 240V
【Instant Endless Hot Water】 The electric tankless water heater 240v 24kw features a powerful heating system, providing up to 5.55 GPM of instant on-demand hot water with a starting flow rate of only 0.79 GPM. Without long waits, you can comfortably use shower and sink simultaneously, without worrying about running out of hot water or a sudden stop in the cold water
Top 20
Best for 30 Gallon
Best for 2 GPM
Best for 5 GPM
Best for 7 GPM
Best for 8 GPM
Best for 10 GPM
Best for 15 GPM
Wintemp 27kW Tankless Water Heater Electric 240V, Whole House On Demand Hot Water, Automatically Maintains Water Temperature, Up to 6.5 GPM, WiFi Control, ETL Eertified, Eco, WM27V Plus
WINTEMP
WM27V
13.0 x 13.0 x 15.9 inches
21.5 Pounds
Ratings for WINTEMP (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| WINTEMP | - | ❌ | ❌ | ❌ |
Features
Important Note: Before purchasing, please ensure this unit meets your installation requirements, 200 Amp Household Service Recommended. The WM27V model is rated at 27kW (240V) with a maximum current of 113A. It requires 3 × 40 Amp double-pole breakers and 3 sets of 8 AWG wiring for installation, with 3/4" NPT water connections, Please consult a qualified electrician before purchasing
Endless Hot Water: Advanced flow control technology automatically maintains water temperature, ensuring maximum efficiency and consistently comfortable hot water. It delivers up to 6.5 GPM of stable hot water output, and if the hot water demand exceeds capacity, the system will slightly reduce the flow to keep the temperature steady-so your hot shower is never interrupted. No more worrying about running out of hot water. Perfect for 2–4 points of use in the home
Top 21
18kw Tankless Water Heater Electric 240v 4.22GPM for Whole House | 3s instant, On Demand Electric Water Heater 240v, 2-3 Point of Use for Whole Home, ETL Certified, Compact Design
Orbek
HEU-ET018A5W-M0
8.0 x 8.0 x 11.0 Inches
Ratings for Orbek (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Westinghouse Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
Note: 18KW (240V) with a maximum amperage of 75A. It requires 2 x 40 Amp DP breakers and 2 x 8/2 AWG wiring with ground, The unit dimensions are 13” (W) x 17 ” (H) x 3.9” (D), the water connection is 3/4" NPT
Energy-Efficient & Cost-Saving - No bulky tank sitting around keeping water hot 24/7. Advanced modulation matches power to demand, helping reduce standby heat loss and potentially saving up to 50% on water-heating costs.
Top 22
Best for Residential
Tankless Water Heater Electric 27kW 240 Volt, thermomate On Demand Instant Endless Hot Water Heater, Digital Temperature Display for Residential Whole House Shower, 114A GRAY
thermomate
ET270
12.9921 x 12.9921 x 18.1102 inches
Ratings for thermomate (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| ThermoMate Official | - | ❌ | ❌ | ❌ |
| thermoflow | - | ✅ | ✅ | ✅ |
| THMOS | - | ✅ | ✅ | ✅ |
Features
[Instant Unlimited Hot Water] - REQUIRE 3 SET x Double-pole 40AMP Breakers to Achieve 240V for this On demand tankless electric water heater, providing hot water in 3 seconds when you need it and as long as you need, eliminating wait time, never run out of hot water again and No More cold shower. Flow Rate 5.27GPM @35°F Rise
[Self-modulating Power] - Self-modulating technology regulating the amount of energy required to heat water only when you need it with 99.8% efficient, saving up to 60% on water heating cost comparing to traditional tank water heater. Wall mounted compact size with no water tank, convenient for any spaces, saving floor space and fitting into tight spaces.
Top 23
Best for Inline
Best for Electric
Best for Indoor
Best Tankless Water Heaters
Best for EcoSmart
Best for 3 GPM
18kW Tankless Water Heater Electric, NOVIEEX 240V 3s Instant Hot Water Heater, Flow Rate Max 4.9 GPM, Supply for 2-3 Points, Indoor Installation, Ideal for Apartment, Garage, Salon, Bathroom, Kitchen
NOVIEEX
DS-18
11.14 x 11.14 x 15.86 inches
Ratings for NOVIEEX (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| NOVIEEX Global | - | ❌ | ❌ | ❌ |
| Woot | 115 | ❌ | ❌ | ❌ |
Features
【HIGH-POWER 18kW PERFORMANCE】 Built for demanding hot water needs, this 18kW tankless water heater delivers high-power heating performance at 240V, with a maximum current of 75A. It requires 2 × 40A double-pole circuit breakers and 2 sets of 8 AWG wires with a ground wire. The unit measures 11.14" (W) × 15.86" (H) × 3.18" (D) and features 3/4" NPT water connections. Please consult a qualified electrician and verify that your electrical system meets the requirements before purchasing.
【MEDIUM HOME SOLUTION】 The NOVIEEX 18kW electric tankless water heater is specifically engineered for small-to-medium-sized homes, condos, and apartments with 2-3 simultaneous water needs. Its sleek, ultra-thin wall-mount profile frees up 80% more space compared to obsolete, bulky storage tanks, maximizing spatial efficiency in your basement, utility closet, or garage.
Tankless Water Heater Electric ，110v 0-3500W Whole House Tankless Hot Water Heater with Led Temperature Display for Indoor or Outdoor Black-5 Years Quality Assurance
HNK
D3548A11
9.13 x 9.13 x 7.59 inches
Ratings for HNK (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| youerduo | - | ❌ | ❌ | ❌ |
Features
RELIABLE MATERIAL, SAFE AND STABLE:This 110v 3500w Tankless water heater electric uses 304 stainless steel water pipe, all-aluminum die-cast heating body and corrosion resistant housing to ensure efficient heating and super durability under long-term use. Built-in anti-leakage protection device, insulation material, multiple safety protection design, let you enjoy worry-free hot water experience, safety more assured
HIGH EFFICIENCY AND ENERGY SAVING:This water heater can heat water to the ideal temperature in an instant, no long wait, and truly realize the convenience of enjoying hot water life immediately. The use of advanced intelligent temperature control technology, accurately adjust the water temperature, reduce energy waste, compared with traditional water heaters more energy saving , is the ideal choice for modern family energy saving life
Top 25
18kW Tankless Water Heater Electric 240V SIVUATEK, Self-Modulating Power for Optimal Efficiency, On Demand Instant Hot Water for Whole House, LED Display, ETL Certified
SIVUATEK
TSB-180
12.2 x 12.2 x 17.26 inches
Ratings for SIVUATEK (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| SIVUATEK-US | - | ❌ | ❌ | ❌ |
Features
【PLEASE NOTE BEFORE PURCHASE】Ensure this 18kW 240V tankless electric water heater meets your hot water demand. Requires 2 x 40-amp circuit breaker. Unit dimensions: 15.87"x11.14"x2.87"; standard 3/4" NPT water connection.
【ENERGY-SAVING & EFFICIENT】Eliminate standby energy loss with our electric tankless water heater —no preheating, zero idle power use. Reduce your water heating costs by up to 60% compared to traditional models. Compact and space-saving, it installs flexibly under-sink or on-wall.
Top 26
Best Gas Water Heaters
Best for 30 Gallon
Best for 40 Gallon
Best for 50 Gallon
Best for 60 Gallon
Best for 75 Gallon
Best for Tankless
Best for 50 Gallon
Best for Takagi
Best for 2 GPM
Best for 4 GPM
MIZUDO Natural Gas Tankless Water Heater, Indoor or Outdoor Convertible Installation, Max 5.1 GPM 120,000 BTU, WiFi&APP Control CSA Certified for Large Families Whole House, GEN 3
MIZUDO
FDG-CS120AW-NG
14.56 x 14.56 x 22.83 inches
Ratings for MIZUDO (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Mizudo Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
[Flexible Indoor&Outdoor Installation Solution]: Mizudo innovative natural gas tankless water heater indoor offers versatile installation options to meet various home configurations. Convert from indoor to outdoor use with accessory kits (Purchase Required), providing homeowners unprecedented flexibility for space utilization
[Smart WiFi and App Control]: Manage your tankless water heater gas remotely through the dedicated mobile application. Adjust temperature settings, monitor energy usage, and receive maintenance notifications from anywhere
Top 27
240V Tankless Water Heater, 27kW Electric Instant Hot Water Heater with LED Temperature Display, On-Demand Endless Hot Water for Whole House Shower, Space-Saving Design for Residential Use
MRNIU
Mrniu27
13.1 x 13.1 x 17.7 inches
14.24 pounds
Ratings for MRNIU (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Mrniu | - | ❌ | ❌ | ❌ |
Features
[Compact & Space-Saving Design]The compact, space-saving design of this tankless water heater is ideal for small homes, apartments, and commercial spaces. It mounts easily on the wall, freeing up space in your bathroom or kitchen.
[Safe & Reliable]Equipped with multiple safety features, including overheat protection and automatic shut-off, this tankless water heater ensures your safety while delivering hot water reliably and efficiently. The durable build guarantees long-lasting use.
Top 28
24Kw 240V Electric Tankless Water Heater, LED Temperature Display, On-Demand Instant Hot Water, Space-Saving Design for Whole House Shower – Endless Hot Water Supply for Residential Use
MRNIU
Mrniu24
13.1 x 13.1 x 17.7 inches
14.24 pounds
Ratings for MRNIU (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Mrniu | - | ❌ | ❌ | ❌ |
Features
[Compact & Space-Saving Design]The compact, space-saving design of this tankless water heater is ideal for small homes, apartments, and commercial spaces. It mounts easily on the wall, freeing up space in your bathroom or kitchen.
[Safe & Reliable]Equipped with multiple safety features, including overheat protection and automatic shut-off, this tankless water heater ensures your safety while delivering hot water reliably and efficiently. The durable build guarantees long-lasting use.
Top 29
Tankless Water Heater Electric 11kW 240V On-Demand Instant Hot Water Heater with Digital Display Self-Modulating for Whole House & Apartment
Garvee
PTH_33HAA3LA9Ks-h
14.17 x 14.17 x 2.99 inches
13.32 pounds
Ratings for Garvee (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Garvee | - | ❌ | ❌ | ❌ |
| Garvee Direct | - | ❌ | ❌ | ❌ |
Features
11KW 240V High Efficiency Instant Hot Water – Provides steady and instant hot water on demand, no more waiting, ideal for bathroom, kitchen, and residential use with consistent water flow
Square Design & Sturdy Iron Metal Enclosure – Compact square shape for easy installation and space saving, heavy-duty metal iron housing ensures durability, anti-rust, anti-corrosion and long service life
Top 30
14kW Tankless Water Heater Electric, 240V On-Demand Hot Water Heater | 3s Instant Heating, ±1℉ Precise Control, 2 Points Use, Max 2.85 GPM, 98% High Thermal Efficiency, LED Display, Touch Control
PeiXWming
ERSSDF00
11.26 x 11.26 x 19.37 inches
13.56 pounds
Ratings for PeiXWming (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Peiming | - | ❌ | ❌ | ❌ |
Features
【Instant Hot Water Supply】PeiXWming 14kW electric tankless hot water heater can provide up to 2.85 GPM of unlimited hot water as needed, and can provide hot water for 1-2 usage points simultaneously. It can provide continuous hot water supply in just 3 seconds, eliminating long waiting times and the anxiety of running out of hot water in the tank.
【Intelligent Frequency Conversion】The intelligent system of this electric tankless water heater 240v can automatically adjusts energy consumption based on the inlet water temperature and flow rate to ensure maximum efficiency, continuous stable temperature, and optimal power usage. Thanks to a built-in chip that can be adjusted more than 20,000 times per second, this tankless electric water heater can keep the water temperature within ± 1 ° F of your selected temperature, ensuring a consistently comfortable experience for you.
Top 10 Whole House Water Heaters - Verified to Buy (October 2026)
- 1. 18kW Tankless Water Heater Electric 240V WINTEMP, On Demand Instant...
- 2. Tankless Electric Hot Water Heater Set, 4500W 110V Under Sink...
- 3. Electric Tankless Water Heater SIVUATEK 18kW, 240V - On-Demand Hot...
- 4. Electric Tankless Water Heater WINTEMP 27kW 240V, Whole House Hot...
- 5. Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
- 6. VEVOR Tankless Water Heater Gas, 4.3Gal Instant Water Heater, 100000...
- 7. Ranein 18kW Electric Tankless Water Heater, 240V On Demand Instant...
- 8. 110V Tankless Water Heater Electric, 3000W Tankless Electric Water Heater...
- 9. Stiebel Eltron Tankless Water Heater – Tempra 24 Trend –...
- 10. 27kW Tankless Water Heater Electric 240V, Whole House, Gray
Top 10 Whole House Water Heaters Brands on Amazon
Here is the list of top-rated brands that were evaluated by CherryPicks.
- WINTEMP
- Beuioslyr
- SIVUATEK
- Rheem
- VEVOR
- Ranein
- xwdzswgs
- Stiebel Eltron
- QERPRE
- thermomate
Related Whole House Water Heaters Guides
For more personalized Whole House Water Heaters guides, Check those pages,
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Top 10 Whole House Water Heaters Sellers: CPR Seller Rank List
CPR sellers rank is based on CherryPicks-AI bestselling ranking system that helps us analyze each seller's sales trends. The List of top seller ranks is our in-house data, essential for our product ranking to help you make the right shopping choice.
- 1. Woot : 266,742 Yearly Feedback , Avg. Ratings 4.8
- 2. Plumber's Paradise : 2,222 Yearly Feedback , Avg. Ratings 4.8
- 3. MTL Retailers : 499 Yearly Feedback , Avg. Ratings 4.1
- 4. Mizudo Home Comfort Direct : 404 Yearly Feedback , Avg. Ratings 4.7
- 5. Amazon.com : 386 Yearly Feedback , Avg. Ratings 4.7
- 6. ThermoMate Official : 375 Yearly Feedback , Avg. Ratings 4.7
- 7. thermoflow : 303 Yearly Feedback , Avg. Ratings 4.7
- 8. Westinghouse Home Comfort Direct : 268 Yearly Feedback , Avg. Ratings 4.8
- 9. Mega Mart Warehouse : 218 Yearly Feedback , Avg. Ratings 3.7
- 10. PEACHSTATESTEALSANDDEALS : 180 Yearly Feedback , Avg. Ratings 4.2
| Rank | Name | Yearly Feedbacks | Avg. Ratings |
|---|---|---|---|
| 🥇 | Woot | 266,742 | 4.8 |
| 🥈 | Plumber's Paradise | 2,222 | 4.8 |
| 🥉 | MTL Retailers | 499 | 4.1 |
| 4 | Mizudo Home Comfort Direct | 404 | 4.7 |
| 5 | Amazon.com | 386 | 4.7 |
| 6 | ThermoMate Official | 375 | 4.7 |
| 7 | thermoflow | 303 | 4.7 |
| 8 | Westinghouse Home Comfort Direct | 268 | 4.8 |
| 9 | Mega Mart Warehouse | 218 | 3.7 |
| 10 | PEACHSTATESTEALSANDDEALS | 180 | 4.2 |
[Get] Whole House Water Heaters Deals (✅Exclusively for Prime)
What does "Amazon Fulfilled" Mean?
Amazon Fulfilled refers to products handled by Amazon's logistics, which indicates that the product is stored, packed, and shipped by Amazon from one of its fulfillment centers.
When you order a product that is "Amazon Fulfilled," Amazon takes care of the storage, packing, shipping, and customer service for that product. This often ensures quicker delivery and better customer service compared to products that are not fulfilled by Amazon. It also means that the product is eligible for Amazon's return policy.
What does "Prime" Mean?
"Prime" refers to Amazon Prime Member (Join Amazon Prime Now), which indicates eligibility for Prime benefits. When you see "Prime" next to a product on Amazon, This generally means that if you are an Amazon Prime member, you can get free two-day shipping on that product, and sometimes even same-day or one-day shipping depending on your location.
Prime members also have access to other benefits, including 2-Day Shipping, Exclusive Member Deals, Prime Video, Buy With Prime, Amazon Music, Prime Gaming, and more.
Shop Prime Whole House Water Heaters Deals
What does "Free Shipping" Mean?
"Free Shipping" means that you will not be charged additional fees for the shipping of that product. However, unlike "Prime," which usually guarantees fast two-day shipping, "Free Shipping" doesn't necessarily mean fast shipping.
Sometimes there might be a minimum purchase requirement to qualify for free shipping if you are not a Prime member. For Prime members, the "Free Shipping" usually refers to the free two-day shipping that is one of the benefits of the Prime membership.
Why Should You Trust Us?
Now hundreds and thousands of Rough Plumbing supplies are available on Amazon, Picking the right one is not easy, and that may take a lot of your time, Right? and What is the best Whole House Water Heaters to buy for new October 2026?
CherryPicks’s Methodology for Evaluating Whole House Water Heaters
We developed the CherryRatings-AI system to identify and score reviews and the CherryPicks-AI ranking system that uses TensorFlow framework to generate the best list, It will help us evaluate Rough Plumbing items that sell on Amazon. The score of items is based on over ten parameters such as analyzing customer review content, product reviewing rating statistics, brand reputation evaluation, comparing product price with features, etc, You can visit How We Rank to learn more in detail.
We collected and analyzed 306 of Whole House Water Heaters reviews based on our selection criteria. It helped us shortlist the top qualified and rated Whole House Water Heaters for Rough Plumbing, We found that most customers choose Whole House Water Heaters with an average price of $326.46, and the top brands are VEVOR, Westinghouse, Rheem, thermomate And Stiebel Eltron.
Then our expert-level editors reviewed all those quality items and selected the top 30 Whole House Water Heaters for you, We have researched hundreds of sellers and picked the top sellers for Rough Plumbing, including Amazon Resale, Woot, Plumber's Paradise, MTL Retailers, Mizudo Home Comfort Direct, Amazon.com, ThermoMate Official, thermoflow, Westinghouse Home Comfort Direct, Mega Mart Warehouse, PEACHSTATESTEALSANDDEALS And AXY Co. The 18kW Tankless Water Heater Electric 240V WINTEM... are available for purchase right now, and The seller of #1 rank product has received honest feedback from 203 consumers with an average rating of 4.4.
We've helped a lot of satisfied users get the right Tools & Home Improvement product based on their needs, and save lots of time for them to pick Whole House Water Heaters to buy.
Hunter Lambrick is a contributing writer on the Cherrypicksreview platform who specializes in writing articles on outdoor events and home tool products. He has been doing this for a while now and has developed a wealth of experience in it.