Top 29 Whole House Water Heaters on Amazon (Verified You can Buy)
Top 1
18kW Tankless Water Heater Electric 240V, Whole House with LED Display
MERXENG
aV3-lxx-heaters-18KW-vImcFRO
11.42 x 11.42 x 3.54 inches
16.76 Pounds
Ratings for MERXENG (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Zhonglili | - | ❌ | ❌ | ❌ |
Features
Instant Hot Water Without the Bulk of a Tank - This 18kW electric tankless water heater delivers on demand hot water when you need it, helping reduce long wait times compared with traditional storage tank systems. Ideal for daily residential use in bathrooms, kitchens, apartments, and smaller whole house setups.
18kW 240V Heating Power for Reliable Daily Use - Built for 240V residential electric systems, this unit provides strong heating performance for showers, sink use, dish washing, and routine household hot water needs. A practical solution for homes that need compact installation with dependable hot water output.
Top 2
AutoSteelix 27kW Electric Tankless Water Heater 240V Immediate On-Demand Hot Water Digital Display Self-Modulating Energy Efficient Compact Wall-Mounted for Whole House Apartment
AutoSteelix
bQ5-33HB3MVRzOaZWm
11.42 x 11.42 x 3.54 inches
17.86 Pounds
Ratings for AutoSteelix (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| YuguoY | - | ❌ | ❌ | ❌ |
Features
Immediate, endless hot water on demand with advanced self-modulating technology for efficient whole-house use.
High-quality stainless steel or heavy-duty iron casing for durability and corrosion resistance in humid environments.
Top 3
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 | - | ❌ | ❌ | ❌ |
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 4
18Kw 240V Electric Tankless Water Heater, On-Demand Instant Hot Water, LED Temperature Display, Space-Saving Design for Whole House Shower Bath Endless Hot Water Supply for Residential Use
MRNIU
Mrniu18
10.7 x 10.7 x 17.1 inches
14.0 Pounds
Ratings for MRNIU (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Mrniu | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
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 5
VEVOR Tankless Water Heater Electric, 27KW 240V Black Instant Water Heater, LCD Touch Screen, Digital Temperature Display, Child Security Lock, On Demand for Bathroom, Kitchen, Shower, Mall, Salon
VEVOR
JN27
10.94 x 10.94 x 3.937 inches
13.56 pounds
Ratings for VEVOR (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| VEMIXO | - | ❌ | ❌ | ❌ |
| Amazon.com | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
Die-Cast Aluminum Heating: The water and electricity are separated, with no water tank, avoiding the buildup of scale and reducing the risk of electric leakage. The 27kW heating system can provide water at 30-60°C / 86-140°F within seconds. Before purchasing, please carefully review the product details (voltage, power, additional accessories and parts required, installation information, etc.)
Applicable Regions: You can choose the ideal tankless water heater based on your location. Our hot water heaters feature constant temperature control and over-temperature protection, so you don’t need to worry about sudden temperature fluctuations during showers
Top 6
WINTEMP Tankless Water Heater Electric 27kW 240V, Whole House Instant Hot Water, Up to 6.3 GPM, Digital Self-Regulating System, Space-Saving Wall Mount, ETL Certified
WINTEMP
YQ-WN27K
11.1 x 11.1 x 19.1 inches
Ratings for WINTEMP (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| GREENTECH APPLIANCE | - | ❌ | ❌ | ❌ |
Features
Important Note: Ensure this tankless water heater meets your installation requirements. 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
Energy Saving: The self-regulating technology automatically adjusts power based on real-time water flow and temperature settings. When the water flow decreases, the system reduces power to save energy; when not in use, it consumes no electricity, achieving up to 99% energy savings. Compared to traditional tank water heaters, it is more energy-efficient and suitable for 2-4 points of use in the home
Top 7
Best Water Heaters & Parts
Best for Rheem
Best for Inline
Best for Tanked
Best for Electric
Best for NG
Best for Digital
Best for Thermostat
Best for Rheem
Best for 20 Gallon
Best for 50 Gallon
Best for Takagi
Best for Noritz
Best for Rheem
Best for Stiebel Eltron
Best for Rinnai
Best for EcoSmart
Best for FOGATTI
Best for GASLAND
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 7 GPM
Best for 8 GPM
Best for 9 GPM
Best for 10 GPM
Best for 11 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 | - | ❌ | ❌ | ❌ |
Features
External digital thermostatic control with LED display (+/1 degree accuracy)
Most advanced self-modulation, adjust power to meet hot water demand
Top 8
Best for Rheem
Best for Tanked
Best for 20 Gallon
Best for Takagi
Best for Noritz
Best for Rinnai
Best for FOGATTI
Best for Eccotemp
Best for AO Smith
Best for 2 GPM
Best for 4 GPM
Best for 7 GPM
Best for 8 GPM
Best for 9 GPM
Best for 10 GPM
Best for 11 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
99.8% Energy efficient
Ratings for Rheem (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ✅ | ✅ | ✅ |
| GM Not Mo | - | ✅ | ✅ | ✅ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
| Columbiatradestock (S/N Info Recorded) | - | ❌ | ❌ | ❌ |
| Sunny ING | - | ❌ | ❌ | ❌ |
| Nantek | - | ❌ | ❌ | ❌ |
Features
ON/OFF Dial Control with adjustable digital temperature display
Self-modulating power control
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 10
Best for Rheem
Best for Indoor
Best for High Efficiency
Best for Rheem
Best for 40 Gallon
Best for 50 Gallon
Best for Takagi
Best for Rheem
Best for AO Smith
Best for 3 GPM
Best for 7 GPM
Rheem RTG-70DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater 7.0 GPM, 160,000 BTUs
Rheem
RTG-70DVLN-3
10.27 x 13.5 x 24.2 inches
46.5 Pounds
Ratings for Rheem (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ❌ | ❌ | ❌ |
Features
High-efficiency tankless gas water heater delivers up to 7.0 GPM, perfect for 2–3 bathroom homes with multiple hot water needs like showers and laundry.
Powered by natural gas with 160,000 BTUs, this durable tankless unit ensures fast, reliable hot water—even during peak household demand.
Top 11
Best Water Heaters
Best for Inline
Best for Tanked
Best for 20 Gallon
Best for 2 GPM
Best for 4 GPM
Best for 15 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
High Efficiency
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 12
Best for Gas Powered
Best for Outdoor
Best for 30 Gallon
Best for 50 Gallon
Best for 60 Gallon
VEVOR Tankless Water Heater Propane, 5.3Gal Instant Water Heater, 100000 BTU, Silver Gray, Smart Temperature Control, Multiple Security Protections, Outdoor Use for Whole House
VEVOR
JSW38-20L-B
14.96 x 14.96 x 23.23 inches
29.1 pounds
Ratings for VEVOR (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ❌ | ❌ | ❌ |
| VEMIXO | - | ❌ | ❌ | ❌ |
Features
Enjoy Instant Hot Water: This 5.3Gal, 120,000 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 13
Best for 3 GPM
Best for 4 GPM
Best for 8 GPM
Best for 9 GPM
Best for 10 GPM
Best for 11 GPM
Best for 15 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 | - | ❌ | ❌ | ❌ |
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 14
Best for Gas Powered
Best for LP
Best for Indoor
Best for Propane
Best for 60 Gallon
Best for 80 Gallon
Best for 30 Gallon
Best for 50 Gallon
Best for Takagi
Best for FOGATTI
Best for Eccotemp
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 15
Best for Digital
TOTTE 18KW Electric Tankless Water Heater, 240V On-Demand Instant Hot Water Heater for Whole House, Easy Install with Digital Display for Shower & Sink, White
TOTTE
KF640007US-02AK-001
11.4 x 11.4 x 14.4 inches
Ratings for TOTTE (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| TOTTE | - | ❌ | ❌ | ❌ |
Features
Instant Endless Hot Water On Demand: Say goodbye to cold showers! This 18KW tankless electric water heater delivers a continuous flow of instant hot water the moment you turn on the tap. Powered for whole-house use, it efficiently supports 1-2 applications simultaneously, such as a shower and sink, ensuring you never run out.
Significant Energy & Space Savings: Heat water ONLY when you need it! Unlike traditional tank heaters that constantly reheat water, our on-demand electric water heater can reduce your energy costs by up to 50%. Plus, its compact, wall-mounted design frees up valuable floor space.
Top 16
Best for Rheem
Best for Outdoor
Best for Residential
Best for High Efficiency
Best for Rheem
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 15 GPM
Rheem RTG-84XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater 8.4 GPM, 180,000 BTUs
Rheem
RTG-84XLN-3
9.4 x 13.5 x 20.75 Inches
39.25 pounds
Ratings for Rheem (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Columbiatradestock (S/N Info Recorded) | - | ❌ | ❌ | ❌ |
| Amazon.com | - | ❌ | ❌ | ❌ |
Features
High-efficiency tankless gas water heater delivers up to 8.4 GPM, perfect for 2–3 bathroom homes with multiple hot water needs like showers and laundry.
Powered by natural gas with 180,000 BTUs, this durable tankless unit ensures fast, reliable hot water—even during peak household demand.
APUS Tankless Water Heater Propane, 140,000 BTU Indoor Installation Up to 6.8 GPM, Zero Cold Water Technology for Instant Hot Water on Demand, Smart Wi-Fi App Control
APUS
AP-AWH-Q20LPG
7.09 x 7.09 x 21.26 Inches
26.9 Pounds
High
Ratings for APUS (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| APUS WATER EQUIPMENT | - | ❌ | ❌ | ❌ |
Features
Instant Hot Water: This upgraded smart propane tankless water heater delivers consistent performance with its 140,000 BTU burner and durable oxygen-free copper heat exchanger. With the latest intelligent heating technology, it provides hot water in just 1 second, giving you instant comfort without the wait
Zero Cold Water Tech - Instant Hot Water：Our tankless water heater propane system features APUS exclusive single-circulation technology that eliminates cold water wait time. This on demand water heater delivers instant hot water while its 24/7 ECO smart cycle saves 40% more energy than conventional hot water heaters
VEVOR Tankless Water Heater Electric, 18KW 240V Black Instant Water Heater, LCD Touch Screen, Digital Temperature Display, Child Security Lock, On Demand for Bathroom, Kitchen, Shower, Mall, Salon
VEVOR
JN18
11.1 x 4.0 x 19.1 inches
11.68 pounds
Ratings for VEVOR (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| VEMIXO | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
| Suplander | - | ❌ | ❌ | ❌ |
Features
Energy Efficiency: You're choosing a greener solution for your hot water needs. Forget about preheating! The electric water heater utilizes a 18kw heating system delivers endless hot water in seconds at temperatures ranging from 86-140℉ or higher. Before purchasing, please carefully review the product details (voltage, power, additional accessories and parts required, installation information, etc.)
Instant Hot Water: The water heater is equipped with a high-performance cast aluminum heater, which effectively separates water and electricity, scale and corrosion resistant. Our electric water heater delivers hot water instantly, saving you time and minimizing water wastage. You can start enjoying ultimate relaxing and comfort in no time!
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 20
Best for Tanked
Best for Gas Powered
Best for Indoor
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
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 | - | ❌ | ❌ | ❌ |
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
Top 21
Best for 4 GPM
14kW Tankless Water Heater Electric, ThermoMate 240 Volt Instant On-Demand Hot Water Heater with Touch Control, Max 3.4 GPM Self-Modulating, ETL Certified for Residential Indoor
thermomate
EH140
11.2 x 11.2 x 15.9 inches
13.0 Pounds
Ratings for thermomate (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| ThermoMate Official | - | ❌ | ❌ | ❌ |
Features
Electrical & Installation Requirements: Before purchasing, please ensure your home's main panel has a total electrical capacity of at least 150 Amps. This 14kW unit requires a dedicated 60 Amp double-pole circuit breaker, 1 set of 6 AWG copper wires, and standard 1/2" NPT water connections for proper installation
Instant & Endless Hot Water: Powering up to 3.4 GPM of on-demand hot water, the ThermoMate 240V electric tankless water heater ensures a continuous supply without running out. Perfect for running up to 1-2 plumbing fixtures simultaneously (such as a shower and a bathroom sink) depending on your inlet water temperature
Top 22
Ranein Propane Gas Tankless Water Heater, 5.3 GPM, 130,000 BTU, Indoor
Ranein
RH13K-LPG
14.17 x 14.17 x 23.15 inches
38.0 pounds
Ratings for Ranein (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Ranein Store | - | ❌ | ❌ | ❌ |
Features
Fans Placed Underneath: It will be more secure in terms of safety, and no smoke backflow will occur. The blower has large power and can automatically adjust the rotating speed according to the change of external wind pressure and the change of water temperature to provide sufficient oxygen for gas combustion, ensuring full combustion and safer use. Low noise and longer service life.
No Waiting Required: Unlike traditional tank water heaters, tankless water heaters eliminate the need for a 30-minute preheating wait time, allowing you to have unlimited hot water on demand.
Top 23
Tankless Water Heater Electric 27kW 240V On-Demand Instant Hot Water Heater with Digital Display Self-Modulating for Whole House & Apartment
Garvee
PTH_33HB3MVR
11.42 x 11.42 x 3.54 Inches
17.86 Pounds
Ratings for Garvee (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Garvee Direct | - | ❌ | ❌ | ❌ |
| Garvee | - | ❌ | ❌ | ❌ |
Features
27kW High Power & Whole-House Hot Water Supply: The 27kW high-power electric tankless water heater delivers powerful and continuous hot water for large homes, supporting simultaneous use of multiple showers, sinks and appliances without temperature drops, meeting the hot water needs of the whole family
Stainless Steel Enclosure & Durable Construction: Built with a premium stainless steel enclosure, this water heater offers excellent corrosion resistance, heat dissipation and long-lasting durability, suitable for long-term indoor use and resisting daily wear and tear
Top 24
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
Best for 30 Gallon
Best for Noritz
Best for 7 GPM
Best for 8 GPM
Best for 9 GPM
Best for 10 GPM
27kW Tankless Water Heater Electric, NOVIEEX 240V 3s Instant Hot Water Heater, Flow Rate Max 7.4 GPM, Supply for 3-4 Points, Indoor Installation, Heavy Duty Ideal for Whole House Use
NOVIEEX
DS-27
14.13 x 14.13 x 15.86 Inches
Ratings for NOVIEEX (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| NOVIEEX Global | - | ❌ | ❌ | ❌ |
Features
【WHOLE HOUSE HEAVY DUTY】 The NOVIEEX 27kW tankless hot water heater electric is a heavy-duty solution custom-built to satisfy full household demands. Designed to seamlessly supply larger homes, its streamlined wall-mount enclosure (14.13" x 15.86" x 3.18") saves 80% more space than mammoth 50+ gallon storage tanks, inserting perfectly into narrow closets or compact utility spaces.
【3-4 MULTI-POINT LUXURY FLOW】 It delivers a massive, industry-topping water flow of up to 7.4 Gallons Per Minute (GPM). This high-velocity output effortlessly services 3 to 4 water applications simultaneously. Fill a grand whirlpool bathtub, run the washing machine, and support multiple master showers concurrently without a single drop in temperature or water pressure.
Top 26
Tankless Electric Hot Water Heater,4500W 110V Instant Water Heater On Demand Bath Shower with LED Screen Display for Bathroom, Bathtub, RV, Whole House, Shower, Sink Small,w/Overheating Protection
CNCEST
HG-HJWJL-2037-US
7.0 x 7.0 x 11.0 inches
Ratings for CNCEST (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| DETAIKENA | - | ❌ | ❌ | ❌ |
Features
【Instant Water Heater】Screen Type: LED; Rated Voltage: AC 110V; Rated Power: 4500W; Heating Power: ±500W; Rated Current: 40.9A; Suitable Water Pressure: 0.02-0.6Mpa; Rated Water Pressure: 0.6Mpa; Working Temperature: 30-55℃/86-131℉; Wire Requirements: ≥ 4cm²/0.62in² Copper Core Wire
【Constant Hot Water】 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 27
Vancepic 18kW Electric Tankless Water Heater 240V Whole House
VancEpic
RE18K
13.8 x 13.8 x 18.7 Inches
16.0 Pounds
Ratings for VancEpic (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Vancepic WarmHome Mall | - | ❌ | ❌ | ❌ |
Features
Note: Make sure this on-demand electric water heater is sized for your hot water needs: 18 kW; 240 volts, circuit breaker required: 2 × 40 amps; unit dimensions: 13.8" × 3.15" × 18.7"; water connection: 3/4" NPT.
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 28
Westinghouse 18kW Electric Tankless Whole House Water Heater, 4.2 GPM Instant Hot Water on Demand, 240V, WIFI & Self Modulating High Efficiency, Copper Heating, LED Display, ETL Certified
Westinghouse
ET018CA0G
14.17 x 14.17 x 3.94 Inches
15.4 pounds
Ratings for Westinghouse (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Westinghouse Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
Electric Tankless Water Heater for Whole House: This 18kW 240V electric tankless water heater delivers up to 4.2 GPM, supplying 2-3 fixtures simultaneously with no temperature drop — ideal for busy households that need reliable hot water on demand, every single time
Smart WiFi Control & Alexa/Google Voice: Remote wifi & app control lets you adjust temperature from anywhere, or go hands-free with Alexa and Google Assistant voice commands. Digital LED display shows real-time status at a glance
Top 29
CAMIIGA 18kW Tankless Water Heater Electric, 240V, 4.4 GPM, 3s Instant Hot Water | LED Display 86-131F, Self-Modulating, Whole House Wall Mount, Space Saving, 99.8% Efficient.
CAMIIGA
CA-18K
11.42 x 11.42 x 14.69 Inches
20.17 pounds
Ratings for CAMIIGA (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Mactii Lab | - | ❌ | ❌ | ❌ |
Features
INSTANT HOT WATER ON DEMAND — The 18kW heating system delivers up to 4.4 GPM for 2–3 simultaneous uses, helping power showers, sinks or laundry without preheating or a bulky storage tank.
ULTRA-SLIM, SPACE-SAVING DESIGN — Measuring 14.69 × 11.42 × 3.54 inches and weighing 20.2 lbs, this wall-mounted heater saves valuable floor space and suits whole-house or point-of-use installation.
Top 10 Whole House Water Heaters - Verified to Buy (September 2026)
- 1. 18kW Tankless Water Heater Electric 240V, Whole House with LED...
- 2. AutoSteelix 27kW Electric Tankless Water Heater 240V Immediate On-Demand Hot...
- 3. 27kW Tankless Water Heater Electric 240V, Whole House, Gray
- 4. 18Kw 240V Electric Tankless Water Heater, On-Demand Instant Hot Water,...
- 5. VEVOR Tankless Water Heater Electric, 27KW 240V Black Instant Water...
- 6. WINTEMP Tankless Water Heater Electric 27kW 240V, Whole House Instant...
- 7. Rheem 18kW 240V Tankless Electric Water Heater
- 8. Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
- 9. Wintemp 27kW Tankless Water Heater Electric 240V, Whole House On...
- 10. Rheem RTG-70DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water...
Top 10 Whole House Water Heaters Brands on Amazon
Here is the list of top-rated brands that were evaluated by CherryPicks.
- MERXENG
- AutoSteelix
- SIVUATEK
- MRNIU
- VEVOR
- WINTEMP
- Rheem
- TOTTE
- APUS
- Stiebel Eltron
Related Whole House Water Heaters Guides
For more personalized Whole House Water Heaters guides, Check those pages,
MOUNTING LOCATION
Top 9 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. VEMIXO : 3,591 Yearly Feedback , Avg. Ratings 4.1
- 2. Suplander : 2,884 Yearly Feedback , Avg. Ratings 4.0
- 3. MTL Retailers : 498 Yearly Feedback , Avg. Ratings 4.1
- 4. Amazon.com : 386 Yearly Feedback , Avg. Ratings 4.7
- 5. ThermoMate Official : 371 Yearly Feedback , Avg. Ratings 4.7
- 6. Westinghouse Home Comfort Direct : 265 Yearly Feedback , Avg. Ratings 4.8
- 7. Columbiatradestock (S/N Info Recorded) : 161 Yearly Feedback , Avg. Ratings 4.6
- 8. DETAIKENA : 76 Yearly Feedback , Avg. Ratings 4.4
- 9. Trena's Liquidation LLC : 61 Yearly Feedback , Avg. Ratings 3.7
| Rank | Name | Yearly Feedbacks | Avg. Ratings |
|---|---|---|---|
| 🥇 | VEMIXO | 3,591 | 4.1 |
| 🥈 | Suplander | 2,884 | 4.0 |
| 🥉 | MTL Retailers | 498 | 4.1 |
| 4 | Amazon.com | 386 | 4.7 |
| 5 | ThermoMate Official | 371 | 4.7 |
| 6 | Westinghouse Home Comfort Direct | 265 | 4.8 |
| 7 | Columbiatradestock (S/N Info Recorded) | 161 | 4.6 |
| 8 | DETAIKENA | 76 | 4.4 |
| 9 | Trena's Liquidation LLC | 61 | 3.7 |
[Get] Whole House Water Heaters Deals (✅Exclusively for Prime)
What does "Amazon Fulfilled" Mean?
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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 September 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 $362.87, and the top brands are VEVOR, Westinghouse, Rheem, thermomate, Stiebel Eltron And CNCEST.
Then our expert-level editors reviewed all those quality items and selected the top 29 Whole House Water Heaters for you, We have researched hundreds of sellers and picked the top sellers for Rough Plumbing, including Amazon Resale, VEMIXO, Suplander, MTL Retailers, Amazon.com, ThermoMate Official, Westinghouse Home Comfort Direct, Columbiatradestock (S/N Info Recorded), DETAIKENA, Trena's Liquidation LLC, Nantek And GM Not Mo. The 18kW Tankless Water Heater Electric 240V, Whole... are available for purchase right now, and The seller of #1 rank product has received honest feedback from 1 consumers with an average rating of 5.0.
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.