Top 28 4 GPM Tankless Water Heaters on Amazon (Verified You can Buy)
Top 1
Best for Takagi
Best for Noritz
Best for Rheem
Best for Stiebel Eltron
Best for EcoSmart
Best for FOGATTI
Best for AO Smith
Best for 2 GPM
Best for 3 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
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 2
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 Whole House
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 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 3
Best for Rheem
Best for Tanked
Best for Electric
Best for Under Sink
Best for 120 Volt
Best for Boiler
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
Rheem 3.5kW 120V Point of Use Thermostatic Tankless Electric Water Heater
Rheem
RTEX-04T
3.0 x 6.0 x 6.0 inches
4.0 Pounds
Ratings for Rheem (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Eagle Point [S/N Recorded] | - | ❌ | ❌ | ❌ |
| Amazon.com | - | ❌ | ❌ | ❌ |
| Valley Deals AZ | - | ❌ | ❌ | ❌ |
| Profitwise Brands | - | ❌ | ❌ | ❌ |
| eFaucets | 9,630 | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
| Columbiatradestock (S/N Info Recorded) | - | ❌ | ❌ | ❌ |
Features
ELECTRICAL REQUIREMENTS: 1 x 30 AMP Double Pole Breaker Required. Product installation hard wired to 120 volts requiring a 30-amp breaker.
SAVES SPACE: Ideal for low flow point-of-use applications, such as in a bathroom, office breakroom, wet bar, or garage. The compact size of the water heater is up to 98% smaller than a standard electric water heater.
Top 4
Best for Residential
Best for 30 Gallon
Best for Noritz
Best for 2 GPM
Best for 3 GPM
Best for 5 GPM
Best for 7 GPM
Best for 15 GPM
27kW Tankless Water Heater Electric, APUS 240V On Demand Instant Hot Water with Memory Function & LED Display, Energy-Saving Whole Home Water Heating System, Up to 6.5 GPM and Space Saving Design,Gray
APUS
AP- ADSK-270G13
11.42 x 11.42 x 17.72 inches
18.96 pounds
99%
Ratings for APUS (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| APUS WATER EQUIPMENT | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
Endless Instant Hot Water On Demand: Experience continuous electric tankless water heater performance with our powerful 27kW tankless water heater, delivering on-demand hot water at up to 6.5 GPM—ideal for 3-4 simultaneous uses (showers, sinks, appliances). The advanced cast aluminum heating element ensures rapid, efficient heating in this tankless hot water heater electric, with no preheating, no waiting, and no cold interruptions.
Smart Control with Memory Function: Precisely set your temperature (86°F-140°F) via the LED display on this electric tankless water heater 240V, with 1°F adjustments for ultimate comfort. The memory function saves settings after power cycles, while self-modulating tech adjusts energy use for efficiency—perfect for smart tankless water heater operation.
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 6
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
Best for GASLAND
Best for 3 GPM
Tankless Water Heater, Novieex On Demand Water Heater Natural Gas, Up to 4.3 GPM, 100,000 BTU Instant Hot Water Heater with LED Display, Indoor Installation, 2-4 Point Use for Family Bathroom Kitchen
NOVIEEX
RS-16
28.54 x 17.32 x 10.83 inches
19.84 Pounds
Ratings for NOVIEEX (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| NOVIEEX Global | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
| Woot | 118 | ❌ | ❌ | ❌ |
Features
【Note 】 This is 4.3GPM natural gas model. Gas rated pressure: 8.04" w.c. (2.0 kPa), Gas Inlet & Cold Water Inlet & Hot Water Outlet：NPT 1/2", Power Supply: 110V-120V AC/60Hz, Water Pressure Range: 1.5-116 psi (0.01-0.8MPa)
【Reliable Hot Water on Demand】 With 100,000 BTU power, this on demand water heater delivers up to 4.3 GPM instant hot water. You can comfortably run a shower, kitchen faucet, and bathroom sink simultaneously—all without any noticeable temperature drop.
Top 7
Best for Gas Powered
Best for Wall
Best for 60 Gallon
Best for Tankless
Best for Eccotemp
Best for 9 GPM
Best for 11 GPM
Propane Gas Tankless Water Heater, Indoor Max 4.3 GPM, 100,000 BTU On Demand Instant Hot Water Heater Propane Gas with LED Temperature Control Panel, 1/2" NPT Connector Size, Gray
LiberLive
HKRV-HR2110
14.2 x 14.2 x 22.1 Inches
Ratings for LiberLive (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Woot | 118 | ❌ | ❌ | ❌ |
Features
Powerful On-Demand Heating – This tankless water heater gas delivers 100,000 BTU & 4.3 GPM, supporting 3–4 water points simultaneously (shower + kitchen sink + bar sink + more). Enjoy endless tankless hot water heater performance with no waiting – perfect for daily household use
Precision Temperature Stability – Unlike conventional gas water heater units, our propane water heater eliminates sudden hot/cold spikes. Adjustable range (95°F–149°F) ensures consistent warmth, safe for infants, kids, and elders – no more unexpected cold blasts
Westinghouse Tankless Water Heater Gas, 5.1 GPM 120,000 BTU Indoor Natural Gas Heater Whole House, Smart WiFi&App Control, CSA Certified, ±1°F Temperature Stability, Non-Condensing for 2-4 Fixtures
Westinghouse
AMZ-HW120A1G-NG
12.5 x 12.5 x 23.9 Inches
Ratings for Westinghouse (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Westinghouse Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
【Endless Hot Water for Everyday Home Use】Designed for indoor whole-home performance, this natural gas tankless water heater delivers up to 5.1 GPM and 120,000 BTU of on-demand hot water for showers, sinks, dishwashers, and laundry appliances. Comfortably supports 2–4 fixtures simultaneously without running out of hot water.
【Smart WiFi App Control】This gas tankless water heater allows you to adjust water temperature and monitor system operation via smartphone app or LED panel. It clearly shows daily water usage reports for at-a-glance consumption tracking, with real-time temperature visibility and simplified operation to deliver a smarter, more convenient hot water experience.
Top 9
Best Water Heaters
Best for Inline
Best for Tanked
Best for Whole House
Best for 20 Gallon
Best for 2 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
FOGATTI Upgrade 18kW Tankless Water Heater Electric, 240V On Demand Instant Hot Water Heater, Up to 4.4 GPM for Whole House Showering, ETL Certified, with LED Display
FOGATTI
18kW
3.9 x 3.9 x 17.1 inches
Ratings for FOGATTI (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Westinghouse Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
NOTE：Be sure to understand the wire usage requirements first. Fogatti 18kW 240V tankless water heater electric requires 2 x 40 AMP Two-pole Circuit Breaker and 2-sets of 8 AWG wires. Water connection 3/4" NPT. Product size 17.1" x 12.9" x 3.9".
Instant & Unlimited Hot Water: Get hot water on demand, the second you need it. This electric tankless water heater delivers a high heating efficiency of up to 98%, providing immediate comfort and remarkable temperature stability. With a flow rate of 4.4 GPM, it's perfectly designed to power 2-3 points of use simultaneously anywhere in your home, ensuring everyone's comfort is met.
Top 11
Best for Rheem
Best for Tanked
Best for Whole House
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 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
Top 12
ThermoMate 98,500 Natural Gas Tankless Water Heater, Up to 4 GPM, High Efficiency Instant On-Demand Hot Water for Whole House Use, Indoor Residential Water Heater with Multi-Point Heating, CZ360NG
thermomate
CZ360NG
13.7795 x 13.7795 x 21.6535 inches
Ratings for thermomate (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| ThermoMate Official | - | ❌ | ❌ | ❌ |
Features
[Max 4 GPM & 98,500 BTU] - The ThermoMate instant water heater delivers water hot enough for simultaneous use— at 105°F to a shower (2 GPM) and a kitchen faucet (1 GPM) — from a 62°F inlet. It reliably supplies a comfortable single shower even with a 40°F inlet temperature. No waiting time, no cold water shocks, perfect for busy households. With an advanced flow sensor, its built-in chip regulates heating 20,000 times/sec to keep water temperature within ±1°F for a stable.
[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 13
Best Water Heaters
Best for Indoor
Best for 30 Gallon
Best Tankless Water Heaters
Best for Rinnai
Best for 5 GPM
Best for 7 GPM
Best for 8 GPM
Best for 9 GPM
Best for 10 GPM
Ranein Propane Gas Tankless Water Heater, Indoor Max 8.5 GPM, 190,000 BTU Instant Hot Water Heater
Ranein
RH19K-LPG
15.08 x 15.08 x 24.25 inches
42.0 Pounds
Ratings for Ranein (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon Resale | - | ❌ | ❌ | ❌ |
| 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 14
Best for Fogatti
Best for 40 Gallon
Best for 60 Gallon
Best for 75 Gallon
Best for 80 Gallon
Best for Tankless
Best for Takagi
Best for Rinnai
Best for FOGATTI
Best for 5 GPM
Best for 8 GPM
FOGATTI Natural Gas Tankless Water Heater Outdoor - Max 8.1 GPM 180,000 BTU, CSA Certified Compact Design On Demand Instant Hot Water Heater - Instagas Comfort 180S Series, New Upgraded
FOGATTI
FOG-PM18OS
17.1 x 17.1 x 26.2 inches
43.2 pounds
Ratings for FOGATTI (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Westinghouse Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
Instant Hot Water: Say goodbye to preheating delays! FOGATTI tankless water heater delivers continuous hot water instantly, powered by 180,000 BTU and up to 8.1 GPM flow rate. Whether it’s for showers, sinks, or appliances, even for 3-5 outlet points, it ensures uninterrupted hot water
Built for Outdoor Durability: Designed specifically for outdoor installation, this tankless water heater gas features a remote control panel for convenient indoor operation. The bottom-mounted fan enhances safety, durability, and lifespan by preventing smoke backflow and ensuring stable combustion, making it reliable in all seasons
Top 15
Best for Whole House
Best for 3 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
CAMPLUX Climatech 3 Tankless Water Heater Gas 4.22 GPM, 102,000 BTU Propane Tankless Water Heaters, High Efficiency Instant Hot Water with Multi-Points Use for Whole House, Indoor, CX422, White
CAMPLUX ENJOY OUTDOOR LIFE
CX422WLP
6.8 x 6.8 x 21.3 Inches
21.1 pounds
Ratings for CAMPLUX ENJOY OUTDOOR LIFE (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Camplux | - | ❌ | ❌ | ❌ |
| DC Home Supply | - | ❌ | ❌ | ❌ |
Features
【4.22 GPM Gas Water Heater】It is ideal for compact houses, mobile homes, and apartments. These gas tankless water heaters produce 4.22 GPM of endless hot water on demand for 2-3 water points
【Temperature Control】The CAMPLUX indoor tankless water heater has sophisticated water flow sensors and a smart chip with 1,000s calculation, which ensures consistent hot waterwith variations of only ±1℉, making bathing enjoyable
Top 17
Best Water Heaters
Best for NG
Best Gas Water Heaters
Best for 30 Gallon
Best for 40 Gallon
Best for 75 Gallon
Best for 80 Gallon
Best for Tankless
Best for 3 GPM
Best for 5 GPM
Westinghouse Smart Tankless Water Heater Gas Indoor, 7.9 GPM 180,000 BTU Whole Home Natural Gas Heater, WiFi App Control, ±1°F Temperature Stability, Non-Condensing for 3-5 Fixtures
Westinghouse
HW180A0G-NG
17.1 x 17.1 x 26.2 inches
Ratings for Westinghouse (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Westinghouse Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
【Endless Hot Water for the Whole Home】Enjoy continuous instant hot water for showers, laundry, dishwashing, and daily household use. Delivering up to 7.9 GPM and 180,000 BTU, this whole house tankless water heater comfortably supports 3–5 fixtures simultaneously without sacrificing comfort or water pressure.
【Smart WiFi App Control】Control your indoor tankless water heater anytime through the smartphone app or LED display panel. Easily adjust water temperature, monitor operating status, and enjoy a smarter, more convenient hot water experience for your home.
Top 18
Propane Gas Tankless Water Heater, Indoor Max 4.3 GPM, 100,000 BTU On Demand Instant Hot Water Heater Propane Gas with LED Temperature Control Panel, 1/2" NPT Connector Size, Gray 4.3 P1
LiberLive
HKRV-HR2109
14.2 x 14.2 x 22.1 inches
Ratings for LiberLive (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| LiberLive Store | - | ❌ | ❌ | ❌ |
| Woot | 118 | ❌ | ❌ | ❌ |
Features
Powerful On-Demand Heating – This tankless water heater gas delivers 100,000 BTU & 4.3 GPM, supporting 3–4 water points simultaneously (shower + kitchen sink + bar sink + more). Enjoy endless tankless hot water heater performance with no waiting – perfect for daily household use
Precision Temperature Stability – Unlike conventional gas water heater units, our propane water heater eliminates sudden hot/cold spikes. Adjustable range (95°F–149°F) ensures consistent warmth, safe for infants, kids, and elders – no more unexpected cold blasts
CAMPLUX 4.22 GPM Propane Tankless Water Heater with 4.33'' S/S Rain Cap, 110,000 BTU Outdoor Hot Water Heater for Off Grid Use, High Flow with Adjustable Controls, Easy to Install & Use
CAMPLUX ENJOY OUTDOOR LIFE
BD422NC
7.5 x 7.5 x 32.5 Inches
15.0 Pounds
Ratings for CAMPLUX ENJOY OUTDOOR LIFE (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Camplux | - | ❌ | ❌ | ❌ |
Features
【Powerful High Flow Hot Water】This propane water heater delivers up to 4.22 GPM of continuous hot water with a robust 110,000 BTU heating, perfect for outdoor showers, camping, and off-grid living where strong, consistent hot water is needed.
【Easy Temperature & Flow Control】Propane tankless water heater features gas and water knobs allow fine temperature tuning, helping prevent sudden hot or cold spikes while adjusting water flow for showers, gear rinsing, or extended outdoor use
Tankless Water Heater, Camplux 5.28 GPM Instant Water Heater Indoor, Propane Hot Water Heater for Whole House, White
CAMPLUX ENJOY OUTDOOR LIFE
CA528M-LP
14.92 x 14.92 x 6.69 Inches
31.3 pounds
Ratings for CAMPLUX ENJOY OUTDOOR LIFE (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Camplux | - | ✅ | ✅ | ✅ |
| Woot | 118 | ❌ | ❌ | ❌ |
Features
Energy & Space Efficient - The propane gas water heater has space-saving design conserves energy as it heats only when necessary.
Optimal Water Pressure - The on demand water heater with high-performance up to 5.28 GPM hot water flow rate for a powerful, constant stream for whole home.
Top 21
Best for 2 GPM
Westinghouse Tankless Water Heater Propane Outdoor, 5.1 GPM 120,000BTU, CSA
Westinghouse
AMZ-HS120A1G-LP
15.5 x 15.5 x 23.9 Inches
Ratings for Westinghouse (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Westinghouse Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
Whole-House Unlimited Instant Hot Water: Engineered for outdoor wall mounting, this propane water heater delivers up to 5.1 GPM with 120,000 BTU with ±1°F stability and continuous flow. Supports 2–4 fixtures simultaneously for showers, kitchen sinks, dishwashers, and laundry. Ideal for 2–4 person families, tiny B&Bs, restaurant back kitchens, beauty salons, and small laundries. Ultra-low 0.53 GPM activation works with 15 PSI minimum pressure, making it suitable for older plumbing systems as well.
Precise ±1°F Temperature Stability: Intelligent self-modulating water-gas linkage technology on this propane tankless water heater matches gas input with water flow in real time, maintaining outlet temperature within ±1°F throughout operation to avoid sudden hot-cold fluctuations during showers. Comes standard with a wired digital controller for convenient temperature adjustment from multiple points around the house, with an adjustable range of 95°F–158°F for precise on-demand heating.
Top 22
Best for NG
Vancepic Natural Gas Tankless Water Heater Indoor,4.3 GPM | 3-4 Point Use for Family, 100,000 BTU, on Demand Instant Hot Water Heater with LED Display, Silent operation, Child Lock Design
VancEpic
VH10K-W-NG-U01
14.4 x 14.4 x 24.6 inches
25.1 Pounds
Ratings for VancEpic (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Vancepic WarmHome Mall | - | ❌ | ❌ | ❌ |
Features
𝐀𝐢𝐫𝐁𝐨𝐨𝐬𝐭 𝐂𝐨𝐦𝐛𝐮𝐬𝐭𝐢𝐨𝐧, 𝐏𝐨𝐰𝐞𝐫𝐟𝐮𝐥 𝐇𝐨𝐭 𝐖𝐚𝐭𝐞𝐫: AirBoost preheated air technology enhances combustion efficiency, delivering up to 100,000 BTU and 4.3 GPM continuous hot water. This natural gas tankless water heater easily supports 3-4 water outlets for whole-house hot water needs.
±𝟏°𝐅 𝐏𝐫𝐞𝐜𝐢𝐬𝐞 𝐓𝐞𝐦𝐩𝐞𝐫𝐚𝐭𝐮𝐫𝐞 𝐂𝐨𝐧𝐭𝐫𝐨𝐥: Intelligent gas water and temperature linkage automatically adjusts heating output to maintain water temperature within ±1°F. Enjoy stable, comfortable hot water without sudden temperature fluctuations.
Top 23
Best for Whole House
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
Tankless Water Heater 4.75 GPM Natural Gas Constant Hot Water
Amzgachfktch
FM-WHAQ3016W
13.7 x 13.7 x 21.6 Inches
Ratings for Amzgachfktch (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| FanmiTechnology | - | ❌ | ❌ | ❌ |
Features
【Endless Constant Hot Water for Whole-Home Use】Delivers a powerful 4.75 GPM flow rate, supporting up to 3-4 fixtures simultaneously—shower, kitchen faucet, and bathroom sink all at once. Powered by a robust 102,000 BTU natural gas burner, this hot water heater provides instant temperature rise and an endless supply of hot water on demand. No more cold shocks when someone flushes a toilet or turns on another tap; every family member enjoys steady, uninterrupted hot water.
【Advanced Precision Temperature Stability (±1°F)】Featuring advanced water servo technology and high-sensitivity temperature sensors, this instant hot water heater precisely adjusts water flow and gas intake in real-time to maintain temperature stability within ±1°F—even when water pressure fluctuates or multiple fixtures are running simultaneously. No more unexpected cold blasts or scalding surprises; just set your ideal temperature (95°F–149°F) and let the system deliver consistent, comfortable hot water on demand.
Top 25
Konfino Indoor Tankless Water Heater Propane Gas - Up to 4.3 GPM, 102,000 BTU for 3-4 Water Point Use, On Demand Instant Hot Water Heater with Smart Digital Display, Multi-Protections & Alarm System
Konfino
Propane Gas Max 4.3GPM
13.8 x 13.8 x 21.7 inches
20.28 pounds
High Efficiency
Ratings for Konfino (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| konfino | - | ❌ | ❌ | ❌ |
Features
Endless Hot Water for Your Whole Family: Experience a continuous flow with our powerful 102,000 BTU heating system, delivering up to 4.3 gallons per minute, it effortlessly supports 3-4 points of simultaneous use—perfect for running a shower while the dishwasher is on. Say goodbye to cold showers and waiting for the tank to refill.
Durable Stainless Steel & Oxygen-Free Copper Core: Engineered for longevity with a corrosion-resistant stainless steel exterior and a high-conductivity oxygen-free copper heat exchanger. This robust construction ensures reliable performance and maximizes heat transfer efficiency for years to come.
Westinghouse Smart Outdoor Tankless Water Heater Gas, 8.1 GPM 180,000 BTU Natural Gas Tankless Water Heater Whole House, ±1°F Temp Stability, Non-Condensing High Efficiency for 3-5 Fixtures, CSA
Westinghouse
HS180A0G-NG
17.1 x 17.1 x 26.8 Inches
Ratings for Westinghouse (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Westinghouse Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
【Endless Hot Water for the Whole Home】Designed for outdoor installation, this natural gas tankless water heater delivers up to 8.1 GPM and 180,000 BTU of powerful on-demand performance. Comfortably supports 3–5 fixtures simultaneously, including showers, sinks, dishwashers, and laundry appliances without running out of hot water.
【Precise ±1°F Temperature Stability】Advanced self-modulating technology automatically adjusts gas and water flow to maintain consistent water temperature within ±1°F for a more stable and comfortable shower experience. Helps reduce cold bursts and sudden temperature fluctuations during everyday household use.
Ranein Propane Gas Tankless Water Heater, Indoor Max 4.3 GPM, 100,000 BTU Instant Hot Water Heater
Ranein
RANEIN-43GPM-100KBTU
14.1732 x 14.1732 x 22.5079 inches
Ratings for Ranein (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Ranein Store | - | ❌ | ❌ | ❌ |
| Woot | 118 | ❌ | ❌ | ❌ |
Features
Powerful On-Demand Heating: 100,000 BTU & 4.3 GPM for this tankless water heater propane, supports 3-4 water points simultaneously, delivers endless propane hot water on demand with no waiting.
4 Intelligent Preset Modes: One-click switch for 4-season/Kitchen/Bathtub/Shower modes on the propane tankless water heater; 4-season auto-matches temp, kitchen defaults to 100°F, bathtub supports 50-800L volume adjustment.
Top 28
Best for 2 GPM
Orbek 120,000 BTU Tankless Water Heater Natural Gas,Indoor/Outdoor
Orbek
HW120A1W-NG
14.57 x 14.57 x 22.83 inches
25.57 pounds
Ratings for Orbek (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Westinghouse Home Comfort Direct | - | ❌ | ❌ | ❌ |
Features
✔️【Endless On-Demand Hot Water】The Orbek tankless water heater gas indoor delivers 120,000 BTU heating capacity with 5.1 GPM high flow rate, featuring innovative 0.53 GPM low-flow start technology. It can provide a continuous supply of hot water to 2-4 outlets at the same time, making it suitable as a whole-house water heater or a practical gift for friends and family
✔️【Smart WiFi, App & Voice Control】: Connect your tankless gas water heater to WiFi and take full control from the Orbek app – or simply use your voice with Alexa. No more manual adjustments. Whether you're at home or away, you can easily set your ideal water temperature, monitor energy usage in real time, and receive instant maintenance alerts directly to your phone.
Top 10 4 GPM Tankless Water Heaters - Verified to Buy (September 2026)
- 1. Electric Tankless Water Heater WINTEMP 27kW 240V, Whole House Hot...
- 2. Rheem 18kW 240V Tankless Electric Water Heater
- 3. Rheem 3.5kW 120V Point of Use Thermostatic Tankless Electric Water...
- 4. 27kW Tankless Water Heater Electric, APUS 240V On Demand Instant...
- 5. Wintemp 27kW Tankless Water Heater Electric 240V, Whole House On...
- 6. Tankless Water Heater, Novieex On Demand Water Heater Natural Gas,...
- 7. Propane Gas Tankless Water Heater, Indoor Max 4.3 GPM, 100,000...
- 8. Westinghouse Tankless Water Heater Gas, 5.1 GPM 120,000 BTU Indoor...
- 9. 18kW Tankless Water Heater Electric 240V WINTEMP, On Demand Instant...
- 10. FOGATTI Upgrade 18kW Tankless Water Heater Electric, 240V On Demand...
Top 10 4 GPM Tankless Water Heaters Brands on Amazon
Here is the list of top-rated brands that were evaluated by CherryPicks.
- WINTEMP
- Rheem
- APUS
- NOVIEEX
- LiberLive
- Westinghouse
- FOGATTI
- thermomate
- Ranein
- CAMPLUX ENJOY OUTDOOR LIFE
Related 4 GPM Tankless Water Heaters Guides
For more personalized 4 GPM Tankless Water Heaters guides, Check those pages,
GPM
Top 9 4 GPM Tankless 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 : 264,925 Yearly Feedback , Avg. Ratings 4.8
- 2. eFaucets : 7,050 Yearly Feedback , Avg. Ratings 4.4
- 3. Camplux : 2,734 Yearly Feedback , Avg. Ratings 4.7
- 4. DC Home Supply : 1,575 Yearly Feedback , Avg. Ratings 4.5
- 5. Amazon.com : 386 Yearly Feedback , Avg. Ratings 4.7
- 6. ThermoMate Official : 371 Yearly Feedback , Avg. Ratings 4.7
- 7. Westinghouse Home Comfort Direct : 265 Yearly Feedback , Avg. Ratings 4.8
- 8. Columbiatradestock (S/N Info Recorded) : 161 Yearly Feedback , Avg. Ratings 4.6
- 9. Trena's Liquidation LLC : 61 Yearly Feedback , Avg. Ratings 3.7
| Rank | Name | Yearly Feedbacks | Avg. Ratings |
|---|---|---|---|
| 🥇 | Woot | 264,925 | 4.8 |
| 🥈 | eFaucets | 7,050 | 4.4 |
| 🥉 | Camplux | 2,734 | 4.7 |
| 4 | DC Home Supply | 1,575 | 4.5 |
| 5 | Amazon.com | 386 | 4.7 |
| 6 | ThermoMate Official | 371 | 4.7 |
| 7 | Westinghouse Home Comfort Direct | 265 | 4.8 |
| 8 | Columbiatradestock (S/N Info Recorded) | 161 | 4.6 |
| 9 | Trena's Liquidation LLC | 61 | 3.7 |
[Get] 4 GPM Tankless Water Heaters Deals (✅Exclusively for Prime)
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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 4 GPM Tankless Water Heaters to buy for new September 2026?
CherryPicks’s Methodology for Evaluating 4 GPM Tankless 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 4 GPM Tankless Water Heaters reviews based on our selection criteria. It helped us shortlist the top qualified and rated 4 GPM Tankless Water Heaters for Rough Plumbing, We found that most customers choose 4 GPM Tankless Water Heaters with an average price of $394.67, and the top brands are Westinghouse, CAMPLUX ENJOY OUTDOOR LIFE, Rheem, thermomate And FOGATTI.
Then our expert-level editors reviewed all those quality items and selected the top 28 4 GPM Tankless Water Heaters for you, We have researched hundreds of sellers and picked the top sellers for Rough Plumbing, including Amazon Resale, Woot, eFaucets, Camplux, DC Home Supply, Amazon.com, ThermoMate Official, Westinghouse Home Comfort Direct, Columbiatradestock (S/N Info Recorded), Trena's Liquidation LLC, Nantek And GM Not Mo. The Electric Tankless Water Heater WINTEMP 27kW 240... are available for purchase right now, and The seller of #1 rank product has received honest feedback from 238 consumers with an average rating of 4.3.
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 4 GPM Tankless Water Heaters to buy.
Sandy Armstrong is a sit-at-home mom that has used a good number of home appliances — some were good, others average, while some were terribly bad and a waste of money. She is here to help you avoid wasting your money by providing you with honest reviews on appliances.