Best High Efficiency Water Heaters

3.6k reviews scanned and analysysed
Vance Diaz
Vance Diaz Writer
Last Updated: Oct 22, 2024 Share On:

You may wonder, what is the best high efficiency water heater ?

After several hours of work by our experts, we have found 565 relevant products with prices ranging from $99.99 to $1866.95.

Keep reading, and we will give you clear and unbiased advice.

A Quick Look: Our Top Picks

Top 1
Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater
9.8We rank the products based on a number of factors such as features, price, customer reviews and so on.

Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater

Top 1 Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater

Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater

Read More Check Price
Top 2
Rinnai RX199 In Condensing Smart Sense Natural Gas Or Propane Tankless Water Heater
9.5We rank the products based on a number of factors such as features, price, customer reviews and so on.

Rinnai RX199 In Condensing Smart Sense Natural Gas Or Propane Tankless Water Heater

Top 2 Rinnai RX199 In Condensing Smart Sense Natural Gas Or Propane Tankless Water Heater

Rinnai RX199 In Condensing Smart Sense Natural Gas Or Propane Tankless Water Heater

Read More Check Price
Top 3
Rinnai RUCS65IN Tankless Hot Water Heater
9.4We rank the products based on a number of factors such as features, price, customer reviews and so on.

Rinnai RUCS65IN Tankless Hot Water Heater

Top 3 Rinnai RUCS65IN Tankless Hot Water Heater

Rinnai RUCS65IN Tankless Hot Water Heater

Read More Check Price

*Note The result is based on our independent research, and we are reader-supported and do not promote any brand or retailer. As a member of Amazon Marketing Affiliates, we may receive a commission from qualified purchases.

Top 20 High Efficiency Water Heaters Reviews 2024 In Detail

1 Editor's Choice

Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater

RHEEMBrand RTG-70XLP-3Model 20.75H*13.5L*13.5W inchesDimension 39.25 lbWeight
Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater cover
Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater thumb #1Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater thumb #2Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater thumb #3Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater thumb #4Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater thumb #5Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater thumb #6
9.8We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Excellent Price: $
Save 13% + FreeShipping

Features
  • Continuous Hot Water & Comfort When Needed Provides enough hot water for your entire house, even when using multiple applications such as a shower and dishwasher
  • Save on Energy Costs High Efficient Water Heater only runs when needed
  • Save Water Water Saving Setting saves up to 1,100 gallons of water per year
  • Hot-start programming keeps the water heater in a ready state, avoiding any cold-water bursts
  • Save Space - New smaller size, 19%, and reduced weight by 22% compared to the previous model for easy installation and space savings
2 Editor's Choice

Rinnai RX199 In Condensing Smart Sense Natural Gas Or Propane Tankless Water Heater

RINNAIBrand RX199Model 30.11H*18.5L*18.5W inchesDimension 55.0 lbWeight
Rinnai RX199 In Condensing Smart Sense Natural Gas Or Propane Tankless Water Heater cover
Rinnai RX199 In Condensing Smart Sense Natural Gas Or Propane Tankless Water Heater thumb #1Rinnai RX199 In Condensing Smart Sense Natural Gas Or Propane Tankless Water Heater thumb #2Rinnai RX199 In Condensing Smart Sense Natural Gas Or Propane Tankless Water Heater thumb #3Rinnai RX199 In Condensing Smart Sense Natural Gas Or Propane Tankless Water Heater thumb #4Rinnai RX199 In Condensing Smart Sense Natural Gas Or Propane Tankless Water Heater thumb #5Rinnai RX199 In Condensing Smart Sense Natural Gas Or Propane Tankless Water Heater thumb #6
9.5We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Excellent Price: $$$
FreeShipping

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)
  • Smart, Efficient Design - This water heater's modern design includes an easy-to-use interface, Quick Flush feature for simplified flushing, as well as a super-high energy efficiency factor of UEF .98; See Controlr module for WiFi control (not included)
  • Professional Installation Recommended - Visit the Find a Rinnai PRO page on our website to find a qualified technician to install your tankless water heater, and use the Rinnai Central App for help with setup, service & troubleshooting; We do not recommend installing a water heater without a technician
  • Find Your Rinnai - See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater size for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region
3 Editor's Choice

Rinnai RUCS65IN Tankless Hot Water Heater

RINNAIBrand RUCS65INModel 34.0H*22.0L*22.0W inchesDimension
Rinnai RUCS65IN Tankless Hot Water Heater cover
Rinnai RUCS65IN Tankless Hot Water Heater thumb #1Rinnai RUCS65IN Tankless Hot Water Heater thumb #2Rinnai RUCS65IN Tankless Hot Water Heater thumb #3Rinnai RUCS65IN Tankless Hot Water Heater thumb #4Rinnai RUCS65IN Tankless Hot Water Heater thumb #5Rinnai RUCS65IN Tankless Hot Water Heater thumb #6
9.4We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Excellent Price: $
Save 11%
Visit Store » eFaucets ( 4.44 / 5 )

Features
  • Endless Hot Water - Our tankless hot water heaters let you enjoy unlimited hot water flow throughout the house with a compact and durable design that fits your home and lifestyle
  • Energy and Space Efficient Tankless Gas Water Heater - This small hot water heater conserves energy, only heating when necessary; Multiple venting options offer flexible placement, including PVC/CPVC using the Ubbink Concentric to Twin Pipe adaptor
  • Optimal Water Pressure - This tankless water heater offers a high-performance hot water flow rate up to 6.5 GPM for a powerful, constant stream that serves up to 5 appliances at once
  • Professional Installation Recommended - Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; We do not recommend installing a water heater without a technician
  • Guaranteed to Last - 12-, 5-, and 1-year residential factory warranty for heat exchanger, parts, and labor respectively
4

Rheem RTGH-95DVELN-3 Super High Efficiency Condensing Indoor Tankless Natural Gas Water Heater

RHEEMBrand RTGH-95DVELN-3Model 23.7H*17.7L*17.7W inchesDimension 51.34 lbWeight
Rheem RTGH-95DVELN-3 Super High Efficiency Condensing Indoor Tankless Natural Gas Water Heater cover
Rheem RTGH-95DVELN-3 Super High Efficiency Condensing Indoor Tankless Natural Gas Water Heater thumb #1Rheem RTGH-95DVELN-3 Super High Efficiency Condensing Indoor Tankless Natural Gas Water Heater thumb #2Rheem RTGH-95DVELN-3 Super High Efficiency Condensing Indoor Tankless Natural Gas Water Heater thumb #3Rheem RTGH-95DVELN-3 Super High Efficiency Condensing Indoor Tankless Natural Gas Water Heater thumb #4Rheem RTGH-95DVELN-3 Super High Efficiency Condensing Indoor Tankless Natural Gas Water Heater thumb #5Rheem RTGH-95DVELN-3 Super High Efficiency Condensing Indoor Tankless Natural Gas Water Heater thumb #6
9.3We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Excellent Price: $$$
FreeShipping

Features
  • Continuous Hot Water & Comfort When Needed Provides enough hot water for your entire house, even when using multiple applications such as a shower and dishwasher
  • Save on Energy Costs Super High Efficient Water Heater only runs when needed
  • Built-in EcoNet Wi-Fi Technology - Customize settings of your water heater, track energy and water usage, receive important alerts for maintenance and control temperature and recirculation settings from your phone of mobile device
  • Hot-start programming keeps the water heater in a ready state, avoiding any cold-water bursts
  • Leak Protection LeakGuard Leak Detection & Prevention protects your home from water damage that detects any internal leak, both large or small
5

Rinnai RSC160IP Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Propane Heater

RINNAIBrand RSC160iPModel 9.0H*9.0L*9.0W inchesDimension 78.0 lbWeight
Rinnai RSC160IP Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Propane Heater cover
Rinnai RSC160IP Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Propane Heater thumb #1Rinnai RSC160IP Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Propane Heater thumb #2Rinnai RSC160IP Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Propane Heater thumb #3Rinnai RSC160IP Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Propane Heater thumb #4Rinnai RSC160IP Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Propane Heater thumb #5Rinnai RSC160IP Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Propane Heater thumb #6
9.1We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Excellent Price: $$
Save 22%
Visit Store » eFaucets ( 4.44 / 5 )

Features
  • Smart-Circ Intelligent Recirculation - This tankless hot water heater features Smart-Circ technology that learns your water usage patterns, then schedules pump and recirucation accordinlgy for superior energy efficiency and convenience
  • Never Run Out of Hot Water with this Compact Tankless Gas Water Heater - This indoor condensing tankless hot water heater from Rinnai is only the size of a small suitcase, but provides up to 9 GPM (6 fixtures at once).
  • Smart, Durable Design - With multiple venting options, water heater fits a wide array of spaces; Includes 15-, 5-, and 1-year residential guarantee for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)
  • Professional Installation Recommended - Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; We do not recommend installing a water heater without a technician
  • Find Your Rinnai - See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region
  • ENERGY STAR qualified with Uniform Energy Factor of 0.110
6

Rinnai RSC199IP Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Propane Heater

RINNAIBrand RSC199iPModel 9.0H*9.0L*9.0W inchesDimension
Rinnai RSC199IP Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Propane Heater cover
Rinnai RSC199IP Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Propane Heater thumb #1Rinnai RSC199IP Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Propane Heater thumb #2Rinnai RSC199IP Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Propane Heater thumb #3Rinnai RSC199IP Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Propane Heater thumb #4Rinnai RSC199IP Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Propane Heater thumb #5Rinnai RSC199IP Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Propane Heater thumb #6
9.1We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Excellent Price: $$$
FreeShipping

Features
  • Smart-Circ Intelligent Recirculation - This tankless hot water heater features Smart-Circ technology that learns your water usage patterns, then schedules pump and recirucation accordinlgy for superior energy efficiency and convenience
  • Never Run Out of Hot Water with this Compact Tankless Gas Water Heater - This indoor condensing tankless hot water heater from Rinnai is only the size of a small suitcase, but provides up to 11 GPM (7 fixtures at once)
  • Smart, Durable Design - With multiple venting options, water heater fits a wide array of spaces; Includes 15-, 5-, and 1-year residential guarantee for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)
  • Professional Installation Recommended - Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; We do not recommend installing a water heater without a technician
  • Find Your Rinnai - See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region
  • ENERGY STAR qualified with Uniform Energy Factor of 0.114
7

Rinnai RSC160IN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater

RINNAIBrand RSC160iNModel 9.0H*9.0L*9.0W inchesDimension
Rinnai RSC160IN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater cover
Rinnai RSC160IN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater thumb #1Rinnai RSC160IN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater thumb #2Rinnai RSC160IN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater thumb #3Rinnai RSC160IN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater thumb #4Rinnai RSC160IN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater thumb #5Rinnai RSC160IN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater thumb #6Rinnai RSC160IN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater thumb #7Rinnai RSC160IN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater thumb #8
8.9We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Very Good Price: $$
FreeShipping

Features
  • Smart-Circ Intelligent Recirculation - This tankless hot water heater features Smart-Circ technology that learns your water usage patterns, then schedules pump and recirucation accordinlgy for superior energy efficiency and convenience
  • Never Run Out of Hot Water with this Compact Tankless Gas Water Heater - This indoor condensing tankless hot water heater from Rinnai is only the size of a small suitcase, but provides up to 9 GPM (6 fixtures at once)
  • Smart, Durable Design - With multiple venting options, water heater fits a wide array of spaces; Includes 15-, 5-, and 1-year residential guarantee for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)
  • Professional Installation Recommended - Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; We do not recommend installing a water heater without a technician
  • Find Your Rinnai - See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region
  • ENERGY STAR qualified with Uniform Energy Factor of 0.109
8

Rheem RTG-84XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater

RHEEMBrand RTG-84XLN-3Model 20.75H*13.5L*13.5W inchesDimension 39.25 lbWeight
Rheem RTG-84XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater cover
Rheem RTG-84XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater thumb #1Rheem RTG-84XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater thumb #2Rheem RTG-84XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater thumb #3Rheem RTG-84XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater thumb #4Rheem RTG-84XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater thumb #5Rheem RTG-84XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater thumb #6
8.8We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Very Good Price: $$
Save 10% + FreeShipping

Features
  • Continuous Hot Water & Comfort When Needed Provides enough hot water for your entire house, even when using multiple applications such as a shower and dishwasher
  • Save on Energy Costs High Efficient Water Heater only runs when needed
  • Save Water Water Saving Setting saves up to 1,100 gallons of water per year
  • Hot-start programming keeps the water heater in a ready state, avoiding any cold-water bursts
  • Save Space - New smaller size, 19%, and reduced weight by 22% compared to the previous model for easy installation and space savings
9

Rheem RTG-95DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater

RHEEMBrand RTG-95DVLN-3Model 24.2H*13.5L*13.5W inchesDimension 46.5 lbWeight
Rheem RTG-95DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater cover
Rheem RTG-95DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater thumb #1Rheem RTG-95DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater thumb #2Rheem RTG-95DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater thumb #3Rheem RTG-95DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater thumb #4Rheem RTG-95DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater thumb #5Rheem RTG-95DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater thumb #6Rheem RTG-95DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater thumb #7
8.7We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Very Good Price: $$
Save 6% + FreeShipping

Features
  • Continuous Hot Water & Comfort When Needed Provides enough hot water for your entire house, even when using multiple applications such as a shower and dishwasher
  • Save on Energy Costs High Efficient Water Heater only runs when needed
  • Save Water Water Saving Setting saves up to 1,100 gallons of water per year
  • Hot-start programming keeps the water heater in a ready state, avoiding any cold-water bursts
  • Leak Protection LeakGuard Leak Detection & Prevention protects your home from water damage that detects any internal leak, both large or small
10

Rinnai RSC199IN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater

RINNAIBrand RSC199iNModel 9.0H*9.0L*9.0W inchesDimension 78.93 lbWeight
Rinnai RSC199IN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater cover
Rinnai RSC199IN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater thumb #1Rinnai RSC199IN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater thumb #2Rinnai RSC199IN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater thumb #3Rinnai RSC199IN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater thumb #4Rinnai RSC199IN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater thumb #5
8.5We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Very Good Price: $$$

Features
  • Smart-Circ Intelligent Recirculation - This tankless hot water heater features Smart-Circ technology that learns your water usage patterns, then schedules pump and recirucation accordinlgy for superior energy efficiency and convenience
  • Never Run Out of Hot Water with this Compact Tankless Gas Water Heater - This indoor condensing tankless hot water heater from Rinnai is only the size of a small suitcase, but provides up to 11 GPM (7 fixtures at once)
  • Smart, Durable Design - With multiple venting options, water heater fits a wide array of spaces; Includes 15-, 5-, and 1-year residential guarantee for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)
  • Professional Installation Recommended - Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; We do not recommend installing a water heater without a technician
  • Find Your Rinnai - See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region
  • ENERGY STAR qualified with Uniform Energy Factor of 0.113
11

Rinnai RSC199EN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater

RINNAIBrand RSC199eNModel 9.0H*9.0L*9.0W inchesDimension
Rinnai RSC199EN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater cover
Rinnai RSC199EN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater thumb #1Rinnai RSC199EN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater thumb #2Rinnai RSC199EN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater thumb #3Rinnai RSC199EN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater thumb #4Rinnai RSC199EN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater thumb #5Rinnai RSC199EN Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Natural Gas Water Heater thumb #6
8.4We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Very Good Price: $$$
FreeShipping

Features
  • Smart-Circ Intelligent Recirculation - This tankless hot water heater features Smart-Circ technology that learns your water usage patterns, then schedules pump and recirucation accordinlgy for superior energy efficiency and convenience
  • Never Run Out of Hot Water with this Compact Tankless Gas Water Heater - This outdoor condensing tankless hot water heater from Rinnai is only the size of a small suitcase, but provides up to 11 GPM (7 fixtures at once)
  • Smart, Durable Design - With no venting required, water heater fits a wide array of spaces; Includes 15-, 5-, and 1-year residential guarantee for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)
  • Professional Installation Recommended - Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; We do not recommend installing a water heater without a technician
  • Find Your Rinnai - See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region
  • ENERGY STAR qualified with Uniform Energy Factor of 0.111
12

Rheem RTG-95DVLP-3 High Efficiency Non-Condensing Indoor Tankless Liquid Propane Water Heater

RHEEMBrand RTG-95DVLP-3Model 24.2H*13.5L*13.5W inchesDimension 46.5 lbWeight
Rheem RTG-95DVLP-3 High Efficiency Non-Condensing Indoor Tankless Liquid Propane Water Heater cover
Rheem RTG-95DVLP-3 High Efficiency Non-Condensing Indoor Tankless Liquid Propane Water Heater thumb #1Rheem RTG-95DVLP-3 High Efficiency Non-Condensing Indoor Tankless Liquid Propane Water Heater thumb #2Rheem RTG-95DVLP-3 High Efficiency Non-Condensing Indoor Tankless Liquid Propane Water Heater thumb #3Rheem RTG-95DVLP-3 High Efficiency Non-Condensing Indoor Tankless Liquid Propane Water Heater thumb #4Rheem RTG-95DVLP-3 High Efficiency Non-Condensing Indoor Tankless Liquid Propane Water Heater thumb #5Rheem RTG-95DVLP-3 High Efficiency Non-Condensing Indoor Tankless Liquid Propane Water Heater thumb #6Rheem RTG-95DVLP-3 High Efficiency Non-Condensing Indoor Tankless Liquid Propane Water Heater thumb #7
8.4We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Very Good Price: $$
Save 6% + FreeShipping

Features
  • Continuous Hot Water & Comfort When Needed Provides enough hot water for your entire house, even when using multiple applications such as a shower and dishwasher
  • Save on Energy Costs High Efficient Water Heater only runs when needed
  • Save Water Water Saving Setting saves up to 1,100 gallons of water per year
  • Hot-start programming keeps the water heater in a ready state, avoiding any cold-water bursts
  • Leak Protection LeakGuard Leak Detection & Prevention protects your home from water damage that detects any internal leak, both large or small
13

Kweetle LF002A Tankless Water Heater Electric

KWEETLEBrand LF002AModel 8.5H*2.7L*2.7W inchesDimension
Kweetle LF002A Tankless Water Heater Electric cover
Kweetle LF002A Tankless Water Heater Electric thumb #1Kweetle LF002A Tankless Water Heater Electric thumb #2Kweetle LF002A Tankless Water Heater Electric thumb #3Kweetle LF002A Tankless Water Heater Electric thumb #4Kweetle LF002A Tankless Water Heater Electric thumb #5Kweetle LF002A Tankless Water Heater Electric thumb #6
8.3We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Very Good Price: $
FreeShipping

Features
  • Instant Hot Water Heater - Say goodbye to long waiting times for hot water, applied with a 5500W heating system, speeding up the heating process, the electric tankless water heater supplies instant hot water, 3 seconds to get hot water without preheating, eliminating the long wait for hot water beside the sink! Instant consistent and endless hot water of the maximum temperature reach 55/131.
  • Advanced Technology&Safety and Intelligence - The Kweetle 110V tankless water heater electric is equipped with state-of-the-art technology, ensuring fast and efficient water heating. Tankless water heater adopts a safe, beautiful, durable, intelligent, ultra-thin, and smooth appearance design, which is gorgeous and elegant, with a simple and direct LCD digital display, intelligent self-inspection, and automatic inspection of working status and performance to ensure safety.
  • Compact Design & Saves Space - This water heater has a compact appearance, it can be easily installed under the sink, and the wall-mount design frees up valuable floor space within your home, it is very suitable for every corner of your home, no need to occupy an area, enjoy hot water at any time. The tankless water heater electric 110v dimensions are 8.5''L x 5.7''W x 2.8''H inches.
  • Energy Efficient - Electric water heater adopts a frequency conversion design, automatically adjusting the power input according to the flow and temperature settings. Unlike a tank heater tankless electric water heaters are 99% thermal energy efficient when the water flow is reduced, the system will consume the least electricity, effectively reducing energy waste.
  • Remote Control & Touch Screen - Ultra slim and smooth appearance design, beautiful and elegant. The temperature can be adjusted by remote control and touch control, which is more convenient to use, can avoid wet hands to adjust, and is safer. The temperature display can be either Celsius or Fahrenheit, turn on the water heater, and then press the on/key for a few seconds to convert between Celsius and Fahrenheit.
14

Ranein Natural Gas Tankless Water Heater

RANEINBrand 23.15H*14.17L*14.17W inchesDimension 35.0 lbWeight
Ranein Natural Gas Tankless Water Heater cover
Ranein Natural Gas Tankless Water Heater thumb #1Ranein Natural Gas Tankless Water Heater thumb #2Ranein Natural Gas Tankless Water Heater thumb #3Ranein Natural Gas Tankless Water Heater thumb #4Ranein Natural Gas Tankless Water Heater thumb #5Ranein Natural Gas Tankless Water Heater thumb #6Ranein Natural Gas Tankless Water Heater thumb #7
8.1We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Very Good Price: $
FreeShipping
Visit Store » Ranein-RV ( 4.81 / 5 )

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.
  • Easy to Assemble and Use - Uses standard 1/2 inch NPT water inlet fittings and 3/4 inch NPT air inlets for quick installation. Its compact size of 23.15"L x 14.17 inch W x 5.9"H takes up almost no space. If you have any questions about installation and operation, please do not hesitate to contact us and we will serve you wholeheartedly
  • Wide Application - 130,000 BTU high heating capacity and maximum 5.3 GPM. It is suitable for 3-5 outlet points, which can satisfy whole family
  • Note - We provide a 2-year warranty for the water heater. If you encounter any issues, please contact us. In cold weather, if the water heater is not used for a long time, the pressure relief valve needs to be opened to drain the remaining water in the water heater.
15

Marey GA30NG Tankless Water Heater Gas, 8.5 Gpm, 199,000 Btu, Natural Gas, High Efficiency

MAREYBrand GA30NGModel 24.0H*15.4L*15.4W inchesDimension 50.0 lbWeight
Marey GA30NG Tankless Water Heater Gas, 8.5 Gpm, 199,000 Btu, Natural Gas, High Efficiency cover
Marey GA30NG Tankless Water Heater Gas, 8.5 Gpm, 199,000 Btu, Natural Gas, High Efficiency thumb #1Marey GA30NG Tankless Water Heater Gas, 8.5 Gpm, 199,000 Btu, Natural Gas, High Efficiency thumb #2Marey GA30NG Tankless Water Heater Gas, 8.5 Gpm, 199,000 Btu, Natural Gas, High Efficiency thumb #3Marey GA30NG Tankless Water Heater Gas, 8.5 Gpm, 199,000 Btu, Natural Gas, High Efficiency thumb #4Marey GA30NG Tankless Water Heater Gas, 8.5 Gpm, 199,000 Btu, Natural Gas, High Efficiency thumb #5Marey GA30NG Tankless Water Heater Gas, 8.5 Gpm, 199,000 Btu, Natural Gas, High Efficiency thumb #6
8.0We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Good Price: $
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Features
  • Top-tier performance and superior durability - its advanced Japanese technology, ensures optimal efficiency for energy and money-saving operations. The perfect combination of functionality, quality, and value.
  • Full-house Endless Hot Water - Enjoy unlimited hot water with up to 4-5 use points running simultaneously, fulfilling all household or light-commercial needs.
  • Premium Components - Designed with superior materials for exceptional heat transfer, protection, and extended product lifetime. Low-NOx emissions and NSF certification ensure clean, eco-friendly water delivery.
  • Certified Quality - CSA certified in the USA and Canada, guaranteeing top safety, quality, and durability standards. Multiple security layers, including overheat, flame failure, and anti-freezing features, ensure worry-free operation.
  • Save Space and Installation-time - Free up storage space with a compact wall- mounted design. Simplify installation with its standard 4 size exhaust venting.
  • This natural gas tankless water heater comes with a 5 years limited warranty.
  • Why Choose Marey - Marey offers water heating solutions for every budget and lifestyle. Since 1955, we've been providing exceptional and innovative tankless water heaters, meeting your every need.
16

Rheem RTGH-RH10DVLP Prestige Condensing Tankless Indoor Liquid Propane Water Heater

RHEEMBrand RTGH-RH10DVLPModel 28.75H*17.38L*17.38W inchesDimension 85.0 lbWeight
Rheem RTGH-RH10DVLP Prestige Condensing Tankless Indoor Liquid Propane Water Heater cover
Rheem RTGH-RH10DVLP Prestige Condensing Tankless Indoor Liquid Propane Water Heater thumb #1Rheem RTGH-RH10DVLP Prestige Condensing Tankless Indoor Liquid Propane Water Heater thumb #2Rheem RTGH-RH10DVLP Prestige Condensing Tankless Indoor Liquid Propane Water Heater thumb #3Rheem RTGH-RH10DVLP Prestige Condensing Tankless Indoor Liquid Propane Water Heater thumb #4Rheem RTGH-RH10DVLP Prestige Condensing Tankless Indoor Liquid Propane Water Heater thumb #5Rheem RTGH-RH10DVLP Prestige Condensing Tankless Indoor Liquid Propane Water Heater thumb #6Rheem RTGH-RH10DVLP Prestige Condensing Tankless Indoor Liquid Propane Water Heater thumb #7Rheem RTGH-RH10DVLP Prestige Condensing Tankless Indoor Liquid Propane Water Heater thumb #8Rheem RTGH-RH10DVLP Prestige Condensing Tankless Indoor Liquid Propane Water Heater thumb #9Rheem RTGH-RH10DVLP Prestige Condensing Tankless Indoor Liquid Propane Water Heater thumb #10
8.0We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Good Price: $$$
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Features
  • Hot water without the wait - or the waste
  • Low operating cost - High energy efficiency and water savings setting
  • Space Savings - Compact, space-saving design. Perfect for a tank replacement.
  • Water & Gas Leak Detection will shut down unit and provide an error code
  • Auto-Learn Programming - tracks water usage over a period of time and auto-programs to meet hot water needs at peak times
17

Rheem RTEX-24 24Kw 240V Electric Tankless Water Heater

RHEEMBrand RTEX-24Model 3.5H*18.25L*14.5W inchesDimension 17.8 lbWeight
Rheem RTEX-24 24Kw 240V Electric Tankless Water Heater cover
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7.9We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Good Price: $
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Features
  • ON/OFF Dial Control with adjustable digital temperature display
  • Self-modulating power control
  • 24kW Model Flow Rate - up to 5.9 GPM for RTEX-24
  • Bottom 3/4 inch NPT water connections
  • On demand, consistent and continuous hot water
18

Rinnai RSC199EP Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Propane Heater

RINNAIBrand RSC199ePModel 9.0H*9.0L*9.0W inchesDimension 61.9 lbWeight
Rinnai RSC199EP Smart-Circ Condensing Gas Tankless Water Heater, Super High Efficiency Plus Propane Heater cover
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7.9We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Good Price: $$
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Features
  • Smart-Circ Intelligent Recirculation - This tankless hot water heater features Smart-Circ technology that learns your water usage patterns, then schedules pump and recirucation accordinlgy for superior energy efficiency and convenience
  • Never Run Out of Hot Water with this Compact Tankless Gas Water Heater - This outdoor condensing tankless hot water heater from Rinnai is only the size of a small suitcase, but provides up to 11 GPM (7 fixtures at once)
  • Smart, Durable Design - With no venting required, water heater fits a wide array of spaces; Includes 15-, 5-, and 1-year residential guarantee for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)
  • Professional Installation Recommended - Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; We do not recommend installing a water heater without a technician
  • Find Your Rinnai - See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region
  • ENERGY STAR qualified with Uniform Energy Factor of 0.112
19

Rinnai CX199IN High Efficiency Plus Natural Gas Interior Tankless Water Heater

RINNAIBrand CX199iNModel 30.11H*18.5L*18.5W inchesDimension
Rinnai CX199IN High Efficiency Plus Natural Gas Interior Tankless Water Heater cover
Rinnai CX199IN High Efficiency Plus Natural Gas Interior Tankless Water Heater thumb #1Rinnai CX199IN High Efficiency Plus Natural Gas Interior Tankless Water Heater thumb #2
7.7We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Good Price: $$$
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Features
  • One model - Indoor/Outdoor, Natural Gas/Propane
  • Super High Efficiency (96%)
  • Smart Sense - Gas Control System
  • Smart Connect - Rinnai Central App - Setup, Service & Troubleshoot
  • Quick Flush - Simplified Flushing
20

Rheem RTGH-95DVELP-3 Super High Efficiency Condensing Indoor Tankless Liquid Propane Water Heater

RHEEMBrand RTGH-95DVELP-3Model 23.7H*17.7L*17.7W inchesDimension 51.34 lbWeight
Rheem RTGH-95DVELP-3 Super High Efficiency Condensing Indoor Tankless Liquid Propane Water Heater cover
Rheem RTGH-95DVELP-3 Super High Efficiency Condensing Indoor Tankless Liquid Propane Water Heater thumb #1Rheem RTGH-95DVELP-3 Super High Efficiency Condensing Indoor Tankless Liquid Propane Water Heater thumb #2Rheem RTGH-95DVELP-3 Super High Efficiency Condensing Indoor Tankless Liquid Propane Water Heater thumb #3Rheem RTGH-95DVELP-3 Super High Efficiency Condensing Indoor Tankless Liquid Propane Water Heater thumb #4Rheem RTGH-95DVELP-3 Super High Efficiency Condensing Indoor Tankless Liquid Propane Water Heater thumb #5Rheem RTGH-95DVELP-3 Super High Efficiency Condensing Indoor Tankless Liquid Propane Water Heater thumb #6Rheem RTGH-95DVELP-3 Super High Efficiency Condensing Indoor Tankless Liquid Propane Water Heater thumb #7
7.5We rank the products based on several factors, like features, price, customer reviews, and so on.
Rating: Good Price: $$$
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Features
  • Continuous Hot Water & Comfort When Needed Provides enough hot water for your entire house, even when using multiple applications such as a shower and dishwasher
  • Save on Energy Costs Super High Efficient Water Heater only runs when needed
  • Built-in EcoNet Wi-Fi Technology - Customize settings of your water heater, track energy and water usage, receive important alerts for maintenance and control temperature and recirculation settings from your phone of mobile device
  • Hot-start programming keeps the water heater in a ready state, avoiding any cold-water bursts
  • Leak Protection LeakGuard Leak Detection & Prevention protects your home from water damage that detects any internal leak, both large or small

FAQ & Notes

Vance Diaz Written By Vance Diaz

During our research, we found more than 565 related products, with prices ranging from $99.99 to $1866.95, and most customers would pay around $1048 for this type of product.

What are the top brands of High Efficiency Water Heaters?

There are 5 brands available for High Efficiency Water Heaters, such as Kweetle, Rheem, Marey, Rinnai, Ranein.

What are the available sellers for High Efficiency Water Heaters?

There are 5 sellers available for High Efficiency Water Heaters, including KW Home&Garden ( 4.81 / 5 ), eFaucets ( 4.44 / 5 ), Amazon.com ( 4.68 / 5 ), Big Frog Supply ( 4.56 / 5 ), Ranein-RV ( 4.81 / 5 ).

Price comparison of the top 10 High Efficiency Water Heaters

*Note: Prices based on historical data.

Price comparison of the top 10 High Efficiency Water Heaters highly recommended

*Note: Prices based on historical data.

The Verdict

After thorough consideration, we have selected the product RHEEM RTG-70XLP-3 as your preferred option.

As an alternative, we have also compiled a list based on user reviews, and the product RHEEM RTEX-24 is also worthy of your purchase.