Top 30 High Efficiency Water Heaters on Amazon (Verified You can Buy)
Top 1
1000W-110V Immersion Water Heater - 10in Immersion Electric Water Heater - Portable Submersible Water Heater Fit for Camping, Ceramics Cups or Bucket Heating
Gfdoso
1
1.0 x 1.0 x 10.43 inches
Ratings for Gfdoso (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Gfdoso | - | ❌ | ❌ | ❌ |
Features
Durable Structure: Made of high-quality iron material, this immersion water heater electric is lightweight and easy to carry, ensuring long-lasting use
Efficient Heating: 110V 1000W immersion heater can quickly heat up 5 gallons of water in just a few minutes. If you need to heat large capacity water, it is recommended to use multiple immersion water heater
Top 2
Rinnai IP090199C I-SERIES Plus 90k BTU Condensing Combi Heat Boiler
Rinnai
IP090199C
18.5 x 18.5 x 26.4 Inches
90.8 Pounds
Ratings for Rinnai (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| eFaucets | 9,547 | ❌ | ❌ | ❌ |
Features
Hot Water And Home Heating In One Appliance: The Rinnai tankless water heater combines hot water supply with robust indoor natural gas or propane heater functionality, ensuring efficient performance for space heating and instant hot water needs
High Energy Efficiency For Significant Savings: With a 96% AFUE-rating, the natural gas or propane heater maximizes efficiency, providing unmatched savings while delivering reliable heat for your home or commercial property.
Top 3
Best for Rheem
Best for Gas Powered
Best for Indoor
Best for Residential
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 Tankless
Best for 50 Gallon
Best for Takagi
Best for Noritz
Best for Rheem
Best for FOGATTI
Best for 3 GPM
Best for 7 GPM
Best for 15 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.
NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 11.1 GPM, 199,000 BTU
Rinnai
RX199iN
30.11 x 18.5 x 30.11 Inches
55.0 pounds
96%
Ratings for Rinnai (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| eFaucets | 9,547 | ❌ | ❌ | ❌ |
| EXPRESS DISTRIBUTION | - | ❌ | ❌ | ❌ |
| Voomi Supply | - | ❌ | ❌ | ❌ |
Features
One Model, Anywhere: This Rinnai tankless water heater is installable indoors or outdoors thanks to our new Versa Vent and powered by either propane or natural gas thanks to a Smart Sense gas control system; RX-OVC vent cap required for outdoor install
Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: This condensing propane and natural gas tankless water heater from Rinnai is only the size of a small suitcase, but provides up to 11.1 GPM (7 fixtures at once)
Top 5
Best for Rinnai
Best for Indoor
Best for Rinnai
Best for Tankless
Best for Rinnai
Best for 9 GPM
Rinnai RE199iN Non-Condensing Natural Gas Tankless Water Heater, Up to 7.6 GPM, Indoor Installation, 199,000 BTU
Rinnai
REU-VE2737FFD-US-N
10.77 x 14.05 x 27.28 inches
52.1 Pounds
Ratings for Rinnai (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Rhino Supply | - | ✅ | ✅ | ✅ |
| Amazon.com | - | ✅ | ✅ | ✅ |
| eFaucets | 9,547 | ❌ | ❌ | ❌ |
| Voomi Supply | - | ❌ | ❌ | ❌ |
Features
Smart Design: Improved design of tankless hot water heater only heats when necessary to conserve energy; Speeds installation and enhances serviceability with a cleaner internal layout; LED screen provides service reminders and error codes
Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: This non-condensing indoor tankless hot water heater from Rinnai is only the size of a small suitcase, but provides up to 7.6 GPM (6 fixtures at once)
Rheem RRTGH95DVLP3701178 Rheem RTGH Series 9.5 GPM 199,900 BTU 120 Volt Residential Indoor Liquid Propane Tankless Water Heater Stainless Steel
Rheem
RTGH-95DVLP-3
9.8 x 17.7 x 23.7 Inches
59.88 pounds
0.82
Ratings for Rheem (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ❌ | ❌ | ❌ |
Features
Flow rate of 0.4 - 9.5 GPM
Available temperature settings range from 100 to 140F (default setting of 120F)
Rinnai RUCS65IP Tankless Hot Water Heater, 6.5 GPM, Propane, Indoor Installation
Rinnai
RUCS65iP
22.0 x 14.5 x 35.0 inches
62.0 Pounds
Ratings for Rinnai (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ✅ | ✅ | ✅ |
| eFaucets | 9,547 | ❌ | ❌ | ❌ |
Features
Endless Hot Water: Enjoy unlimited hot water flow throughout the house; compact, durable, and easy to install; professional installation recommended
Energy and Space Efficient: Space-saving design conserves energy as it heats only when necessary
Top 8
Best for Gas Powered
Best for Whole House
Best for 50 Gallon
Best for 75 Gallon
Best for 7 GPM
Best for 9 GPM
Best for 10 GPM
Best for 11 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
Top 9
Best for Inline
Best for Indoor
Best for Whole House
Best for Residential
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 Rinnai
Best for 3 GPM
Best for 4 GPM
Best for 5 GPM
Best for 7 GPM
Best for 9 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
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 10
Best for Residential
CAMPLUX Climatech 3 Tankless Water Heater Gas Indoor 3.6 GPM, 82,000 BTU Instant On-Demand Natural Gas Water Heater, High Efficiency Instant Hot Water for Whole House 2-3 Points of Use, CX360, White
CAMPLUX ENJOY OUTDOOR LIFE
CX360WNG
6.8 x 6.8 x 13.7 Inches
20.5 Pounds
Ratings for CAMPLUX ENJOY OUTDOOR LIFE (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Camplux | - | ❌ | ❌ | ❌ |
Features
3.6 GPM & 82,000 BTU: CAMPLUX CX360 tankless gas water heaters delivers consistent hot water to 2-3 fixtures simultaneously, you can get unlimited hot water on demand. No need to wait, no cold water shocks.
Easy Installation: CX360 instant gas water heater tankless features standard 3/4" NPT water inlet/outlet connectors, a 1/2" NPT gas inlet, a 3" OD vent, and a UL-approved 120V plug, ensuring compatibility with most households. Saves you installation hassle and costs.
NEW Rinnai RX180iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 10 GPM, 180,000 BTU
Rinnai
RX180iN
19.0 x 19.0 x 31.0 inches
54.0 pounds
Ratings for Rinnai (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazesingh Depot | - | ❌ | ❌ | ❌ |
| ParieGrit | - | ❌ | ❌ | ❌ |
| eFaucets | 9,547 | ❌ | ❌ | ❌ |
Features
One Model, Anywhere: This Rinnai tankless water heater is installable indoors or outdoors thanks to our new Versa Vent and powered by either propane or natural gas thanks to a Smart Sense gas control system; RX-OVC vent cap required for outdoor install
Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: This condensing propane and natural gas tankless water heater from Rinnai is only the size of a small suitcase, but provides up to 10 GPM (6 fixtures at once)
Rinnai RUCS75iN Tankless Hot Water Heater, 7.5 GPM, Natural Gas, Indoor Installation
Rinnai
RUCS75iN
22.0 x 14.5 x 35.0 inches
63.0 Pounds
Ratings for Rinnai (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| eFaucets | 9,547 | ✅ | ✅ | ✅ |
| Amazon.com | - | ✅ | ✅ | ✅ |
| Buildcom | 965 | ❌ | ❌ | ❌ |
| CC's Affordable Home Improvements | - | ❌ | ❌ | ❌ |
Features
Endless Hot Water: Enjoy unlimited hot water flow throughout the house; compact, durable, and easy to install; professional installation recommended
Energy and Space Efficient: Space-saving design conserves energy as it heats only when necessary
Combi Boiler CH 120K BTU/DHW 199K BTU
Rinnai
IP120199C
18.5 x 18.5 x 26.4 Inches
82.7 pounds
Ratings for Rinnai (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| eFaucets | 9,547 | ❌ | ❌ | ❌ |
| Amazon.com | - | ❌ | ❌ | ❌ |
Features
Unmatched Energy Efficiency: The Rinnai I-Series Plus Water Boiler provides significant energy savings with up to a 96% AFUE rating, making it an excellent choice for cost-conscious professionals
Smart Home Compatibility: Featuring Smart Connect technology, these Rinnai Combi Boilers offer Wi-Fi remote access and Bluetooth connectivity through the Rinnai Central App, allowing for convenient monitoring and management
NEW Rinnai RX130iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 7.1 GPM, 130,000 BTU
Rinnai
RX130iN
19.0 x 19.0 x 31.0 inches
54.0 pounds
Ratings for Rinnai (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| eFaucets | 9,547 | ❌ | ❌ | ❌ |
Features
One Model, Anywhere: This Rinnai tankless water heater is installable indoors or outdoors thanks to our new Versa Vent and powered by either propane or natural gas thanks to a Smart Sense gas control system; RX-OVC vent cap required for outdoor install
Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: This condensing propane and natural gas tankless water heater from Rinnai is only the size of a small suitcase, but provides up to 7.1 GPM (4 fixtures at once)
Rinnai RUCS65iN Tankless Hot Water Heater, 6.5 GPM, Natural Gas, Indoor Installation
Rinnai
RUCS65IN
22.0 x 14.5 x 35.0 inches
highly efficient
Ratings for Rinnai (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| eFaucets | 9,547 | ✅ | ✅ | ✅ |
| Amazon.com | - | ✅ | ✅ | ✅ |
| Buildcom | 965 | ❌ | ❌ | ❌ |
Features
Endless Hot Water: Enjoy unlimited hot water flow throughout the house; compact, durable, and easy to install; professional installation recommended
Energy and Space Efficient: Space-saving design conserves energy as it heats only when necessary
Rheem RTG Series 9.5 GPM Natural Gas Tankless Water Heater Outdoor | 199,900 BTUs High Efficiency On Demand, Continuous Hot Water | Non-Condensing | WiFi Enabled
Rheem
RTG-95XELN-3
9.4 x 13.5 x 20.75 inches
40.5 Pounds
Ratings for Rheem (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ❌ | ❌ | ❌ |
Features
High Performance Natural Gas Tankless Water Heater delivers endless instant hot water on demand for whole house residential use | 9.5 GPM at 35°F temperature rise provides 199,900 BTU/hr output for 3-4 simultaneous showers | Never run out of hot water again
Energy Efficient Non-Condensing Gas Tankless Water Heater with 0.82 Uniform Energy Factor (UEF) saves up to 34% on energy costs vs. 50-gallon electric tank heaters | Outdoor installation eliminates venting | Ultra-low gas bills with on-demand heating technology
Rinnai V53DeP Tankless Hot Water Heater, 5.3 GPM, Propane, Outdoor Installation
Rinnai
V53DeP
13.0 x 13.0 x 30.0 inches
33.0 Pounds
High
Ratings for Rinnai (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| eFaucets | 9,547 | ✅ | ✅ | ✅ |
| Amazon.com | - | ✅ | ✅ | ✅ |
| Big Frog Supply | - | ✅ | ✅ | ✅ |
Features
Endless Hot Water: Enjoy unlimited hot water flow throughout the house; compact, durable, and easy to install; professional installation recommended
Energy and Space Efficient: Space-saving design conserves energy as it heats only when necessary
Top 18
Best for NG
CAMPLUX Tankless Water Heater Natural Gas Outdoor Up to 6.4 GPM 150,000 BTU
CAMPLUX ENJOY OUTDOOR LIFE
WA528M-NG
5.91 x 5.91 x 23.43 Inches
31.3 pounds
High Efficiency
Ratings for CAMPLUX ENJOY OUTDOOR LIFE (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Camplux | - | ❌ | ❌ | ❌ |
Features
𝐔𝐩 𝐭𝐨 𝟔.𝟒 𝐆𝐏𝐌 𝐓𝐚𝐧𝐤𝐥𝐞𝐬𝐬 𝐇𝐨𝐭 𝐖𝐚𝐭𝐞𝐫 𝐇𝐞𝐚𝐭𝐞𝐫: Up to 6.4 GPM, each delivering 105°F water at a flow rate of 2 GPM, based on an inlet water temperature of 65°F. Outdoor Installation tankless water heaters gas delivers 5.28 GPM instant hot water on demand, which can provide endless hot water on demand for 3 - 5 water points at the same time. Bathroom*3, Laundry room *2, Kitchen *2, Garage*1. Authentic traffic metrics, not fake.
𝐌𝐮𝐥𝐭𝐢-𝐏𝐫𝐨𝐭𝐞𝐜𝐭𝐢𝐨𝐧: CAMPLUX on-demand tankless gas water heater with CSA certified, with anti-freeze/overheat/dry-fire protections, flame failure detection, highlighting its safety and quality standards, it's the perfect upgrade for efficient and reliable hot water in your home
Top 19
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 Waterproof
Best for Indoor
Best for Under Sink
Best for Residential
Best for 120 Volt
Best for Boiler
Tankless Water Heater Electric 110V, 3000W Instant Electric Water Heater, Under Sink Water Heater with Digital Display, On Demand Hot Water heater Electric for Kitchen Bathroom Washin
xwdzswgs
XY-FC
4.32 x 4.32 x 7.86 inches
Ratings for xwdzswgs (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| liuyiliang7788 | - | ❌ | ❌ | ❌ |
Features
✔ ELECTRIC TANKLESS WATER HEATER - This tankless electric water heater is made of high-quality ABS material, with LED display. With 3000W power, the mini water heater can raise the water by 82° F(0.3GPM) -131° F(0.5GPM) in seconds, providing tankless instant, continuous hot water without waiting for preheating, meeting daily hot water needs. The on demand water heater can set Fahrenheit or Celsius degrees by holding a power button for 6 seconds.
✔ COMPACT AND EFFICIENT DESIGN - The electric water heater tankless adopts an ultra-thin and smooth appearance design, which is beautiful and elegant. The point of use water heater can meet your outlet temperature requirement. The Larger the water flow, the lower the outlet temperature; The smaller the water flow, the higher the outlet temperature. Not Suitable for Shower(Shower normally requires at least 1.8 GPM). Under sink water heater 110v plug in.
Top 20
Best for Rheem
Best for Rheem
Best for 50 Gallon
Best for 60 Gallon
Best for Rheem
Best for 3 GPM
Best for 11 GPM
Rheem RTG-95DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater 9.5 GPM, 199,900 BTUs
Rheem
RTG-95DVLN-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 |
|---|---|---|---|---|
| Buildcom | 965 | ❌ | ❌ | ❌ |
| Voomi Supply | - | ❌ | ❌ | ❌ |
| eFaucets | 9,547 | ❌ | ❌ | ❌ |
| Amazon.com | - | ❌ | ❌ | ❌ |
Features
High-efficiency tankless gas water heater delivers up to 9.5 GPM, perfect for 2–3 bathroom homes with multiple hot water needs like showers and laundry.
Powered by natural gas with 199,900 BTUs, this durable tankless unit ensures fast, reliable hot water—even during peak household demand.
Top 21
Best for LP
CAMPLUX Tankless Water Heater Gas Propane Indoor, Up to 7.6 GPM 199000 BTU
CAMPLUX ENJOY OUTDOOR LIFE
CA686WLP
11.6 x 11.6 x 16.7 Inches
37.5 pounds
Ratings for CAMPLUX ENJOY OUTDOOR LIFE (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Camplux | - | ❌ | ❌ | ❌ |
Features
𝐖𝐡𝐨𝐥𝐞-𝐇𝐨𝐮𝐬𝐞 𝐏𝐫𝐨𝐩𝐚𝐧𝐞 𝐇𝐨𝐭 𝐖𝐚𝐭𝐞𝐫 𝐏𝐨𝐰𝐞𝐫: Up to 199,000 BTU propane water heater delivers Up to 7.6 GPM - runs 4-6 points simultaneously. Up to 7.6 GPM, each delivering 105°F water at a flow rate of 2 GPM, based on an inlet water temperature of 65°F. Built-in -20°F freeze protection with automatic drain assist. Oxygen-free copper heat exchanger Improved heat transfer efficiency.
𝐈𝐧𝐬𝐭𝐚𝐧𝐭 𝐏𝐫𝐨𝐩𝐚𝐧𝐞 𝐇𝐨𝐭 𝐖𝐚𝐭𝐞𝐫 𝐖𝐢𝐭𝐡𝐢𝐧 𝟐 𝐒𝐞𝐜𝐨𝐧𝐝𝐬: On-demand propane water heater eliminates 30-minute tank preheating. 80% faster ignition than standard LP models. Precision flame control prevents temperature fluctuation.
Rinnai RE180iN Non-Condensing Natural Gas Tankless Water Heater, Up to 8.5 GPM, Indoor Installation, 180,000 BTU
Rinnai
REU-VE2432FFD-US-N
10.77 x 14.05 x 27.28 inches
54.0 pounds
Ratings for Rinnai (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ❌ | ❌ | ❌ |
| Buildcom | 965 | ❌ | ❌ | ❌ |
| eFaucets | 9,547 | ❌ | ❌ | ❌ |
Features
Smart Design: Improved design of tankless hot water heater only heats when necessary to conserve energy; Speeds installation and enhances serviceability with a cleaner internal layout; LED screen provides service reminders and error codes
Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: This non-condensing indoor tankless hot water heater from Rinnai is only the size of a small suitcase, but provides up to 6.9 GPM (5 fixtures at once)
Top 23
Best for Inline
Best for LP
Best for Indoor
Best for Residential
Best for Propane
Best for 5 GPM
ThermoMate CZ422LP, Propane Tankless Water Heater, Up to 5 GPM 113,000 BTU, High Efficiency Instant Hot Water for Whole House Use, Indoor Residential on Demand Water Heater with Multi-Point Heating
thermomate
CZ422LP
13.77 x 13.77 x 21.65 Inches
22.0 Pounds
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 24
Best for Rheem
Best for Outdoor
Best for Rheem
Best Gas Water Heaters
Best for 40 Gallon
Best for 50 Gallon
Best for 60 Gallon
Best for 80 Gallon
Best for Tankless
Best for 50 Gallon
Best for Takagi
Best for Rheem
Best for Rinnai
Best for 3 GPM
Best for 10 GPM
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 | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
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.
Top 25
Best for Rheem
Best for LP
Best for Propane Liquid
Best for Outdoor
Best for Rheem
Best Gas Water Heaters
Best for 50 Gallon
Best for Tankless
Best for 50 Gallon
Best for Rheem
Best for Rinnai
Best for 3 GPM
Best for 7 GPM
Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater 7.0 GPM, 160,000 BTUs
Rheem
RTG-70XLP-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 |
|---|---|---|---|---|
| Amazon Resale | - | ❌ | ❌ | ❌ |
| 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 liquid propane with 160,000 BTUs, this durable tankless unit ensures fast, reliable hot water—even during peak household demand.
Top 26
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 Whole House
Best for Under Sink
Best for Wall
Best for Residential
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 EcoSmart
Best for FOGATTI
Best for GASLAND
Best for Eccotemp
Best for AO Smith
Best for 2 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.
Rinnai RXP199iN Condensing Smart Sense Tankless Water Heater
Rinnai
RXP199iN
19.0 x 19.0 x 31.0 inches
58.0 pounds
96%
Ratings for Rinnai (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| The Portland Group | - | ❌ | ❌ | ❌ |
| eFaucets | 9,547 | ❌ | ❌ | ❌ |
Features
One Model, Anywhere: This Rinnai tankless water heater is installable indoors or outdoors thanks to our new Versa Vent and powered by either propane or natural gas thanks to a Smart Sense gas control system; RX-OVC vent cap required for outdoor install
Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: This condensing propane and natural gas tankless water heater from Rinnai is only the size of a small suitcase, but provides up to 11.1 GPM (7 fixtures at once)
Top 28
Best for Rheem
Best for Rheem
Best for 50 Gallon
Best for 50 Gallon
Best for Rheem
Best for 3 GPM
Rheem RTG-84DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater 8.4 GPM, 180,000 BTUs
Rheem
RTG-84DVLN-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 | - | ❌ | ❌ | ❌ |
| eFaucets | 9,547 | ❌ | ❌ | ❌ |
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.
Top 29
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
APUS Tankless Water Heater Natural Gas, Up to 4.42 GPM, Indoor Tankless Water Heater, 95,000 BTU on Demand Instant Hot Water Heaters with Smart Digital Display,Space Gray
APUS
AP-AWH-Q13NG
5.9 x 5.9 x 20.55 inches
19.18 pounds
High
Ratings for APUS (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| APUS WATER EQUIPMENT | - | ❌ | ❌ | ❌ |
| Amazon Resale | - | ❌ | ❌ | ❌ |
Features
Powerful & High-Capacity: This high-performance gas tankless water heater delivers 95,000 BTU heating capacity with 4.42GPM high flow rate, featuring innovative 0.66GPM low-flow start technology. As a versatile natural gas tankless water heater, it meets simultaneous hot water demands for 2 showers plus 1 sink while maintaining stable temperatures even during peak usage.
Precise & Steady: With high-precision sensors and smart CPU technology, this tankless gas water heater maintains water temperature within ±1°F of your desired setting (adjustable from 95°F-140°F). No more sudden hot/cold shocks—just perfectly steady water for showers, washing, and more, even with multiple faucets running. Enjoy worry-free comfort every time!
Top 30
Best for 50 Gallon
Rheem RTGH-84DVLP-3 RTGH Series 8.4 GPM Indoor Liquid Propane Tankless Water Heater
Rheem
RTGH-84DVLP-3
9.8 x 17.7 x 23.7 inches
59.88 Pounds
Ratings for Rheem (CPR Score)
| Seller | CPR Rank | Amazon Fulfilled | Prime | Free Shipping |
|---|---|---|---|---|
| Amazon.com | - | ❌ | ❌ | ❌ |
Features
High Performance Liquid Propane Tankless Water Heater delivers endless hot water on demand for whole house use with 8.4 GPM at 35°F rise, powered by 157,000 BTU/hr
Industry-Leading Condensing Technology with 0.93 Uniform Energy Factor (UEF) for ultra-low gas bills | Indoor installation with direct vent | Ultra-low NOx emissions compliant
Top 10 High Efficiency Water Heaters - Verified to Buy (October 2026)
- 1. 1000W-110V Immersion Water Heater - 10in Immersion Electric Water Heater...
- 2. Rinnai IP090199C I-SERIES Plus 90k BTU Condensing Combi Heat Boiler
- 3. Rheem RTG-70DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water...
- 4. NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane...
- 5. Rinnai RE199iN Non-Condensing Natural Gas Tankless Water Heater, Up to...
- 6. Rheem RRTGH95DVLP3701178 Rheem RTGH Series 9.5 GPM 199,900 BTU 120...
- 7. Rinnai RUCS65IP Tankless Hot Water Heater, 6.5 GPM, Propane, Indoor...
- 8. MIZUDO Natural Gas Tankless Water Heater, 199,000 BTU, Indoor Installation,...
- 9. ThermoMate CZ422NG Natural Gas Tankless Water Heater, Up to 5...
- 10. CAMPLUX Climatech 3 Tankless Water Heater Gas Indoor 3.6 GPM,...
Top 8 High Efficiency Water Heaters Brands on Amazon
Here is the list of top-rated brands that were evaluated by CherryPicks.
- Gfdoso
- Rinnai
- Rheem
- MIZUDO
- thermomate
- CAMPLUX ENJOY OUTDOOR LIFE
- xwdzswgs
- APUS
Related High Efficiency Water Heaters Guides
For more personalized High Efficiency Water Heaters guides, Check those pages,
Featured Topics
Top 10 High Efficiency 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. Buildcom : 51,684 Yearly Feedback , Avg. Ratings 4.5
- 2. eFaucets : 7,127 Yearly Feedback , Avg. Ratings 4.4
- 3. Big Frog Supply : 6,523 Yearly Feedback , Avg. Ratings 4.5
- 4. Camplux : 2,742 Yearly Feedback , Avg. Ratings 4.7
- 5. Voomi Supply : 2,310 Yearly Feedback , Avg. Ratings 4.1
- 6. The Portland Group : 973 Yearly Feedback , Avg. Ratings 4.9
- 7. Amazesingh Depot : 679 Yearly Feedback , Avg. Ratings 5.0
- 8. Mizudo Home Comfort Direct : 404 Yearly Feedback , Avg. Ratings 4.7
- 9. Gfdoso : 390 Yearly Feedback , Avg. Ratings 4.9
- 10. Amazon.com : 386 Yearly Feedback , Avg. Ratings 4.7
| Rank | Name | Yearly Feedbacks | Avg. Ratings |
|---|---|---|---|
| 🥇 | Buildcom | 51,684 | 4.5 |
| 🥈 | eFaucets | 7,127 | 4.4 |
| 🥉 | Big Frog Supply | 6,523 | 4.5 |
| 4 | Camplux | 2,742 | 4.7 |
| 5 | Voomi Supply | 2,310 | 4.1 |
| 6 | The Portland Group | 973 | 4.9 |
| 7 | Amazesingh Depot | 679 | 5.0 |
| 8 | Mizudo Home Comfort Direct | 404 | 4.7 |
| 9 | Gfdoso | 390 | 4.9 |
| 10 | Amazon.com | 386 | 4.7 |
[Get] High Efficiency 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 High Efficiency 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 High Efficiency Water Heaters to buy for new October 2026?
CherryPicks’s Methodology for Evaluating High Efficiency 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 High Efficiency Water Heaters reviews based on our selection criteria. It helped us shortlist the top qualified and rated High Efficiency Water Heaters for Rough Plumbing, We found that most customers choose High Efficiency Water Heaters with an average price of $1,056.16, and the top brands are CAMPLUX ENJOY OUTDOOR LIFE, Rheem, thermomate And Rinnai.
Then our expert-level editors reviewed all those quality items and selected the top 30 High Efficiency Water Heaters for you, We have researched hundreds of sellers and picked the top sellers for Rough Plumbing, including Amazon Resale, Buildcom, eFaucets, Big Frog Supply, Camplux, Voomi Supply, The Portland Group, Amazesingh Depot, Mizudo Home Comfort Direct, Gfdoso, Amazon.com And ThermoMate Official. The 1000W-110V Immersion Water Heater - 10in Immers... are available for purchase right now, and The seller of #1 rank product has received honest feedback from 139 consumers with an average rating of 4.0.
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 High Efficiency 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.