20 Best Tankless Water Heaters [2023]

Are you looking for the best tankless water heaters? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling tankless water heaters.

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1 EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating... EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating...
2 Ecosmart ECO Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self... Ecosmart ECO Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self...
3 Tankless Water Heater Electric 5.5kw 240V, ECOTOUCH Point-of-Use Hot Water Heater Digital... Tankless Water Heater Electric 5.5kw 240V, ECOTOUCH Point-of-Use Hot Water Heater Digital...
4 Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
5 Rheem 18kW 240V Tankless Electric Water Heater Rheem 18kW 240V Tankless Electric Water Heater
6 EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating... EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating...
7 Stiebel Eltron 239223 Tankless Water Heater – Tempra 29 Plus – Electric, On Demand Hot Water,... Stiebel Eltron 239223 Tankless Water Heater – Tempra 29 Plus – Electric, On Demand Hot Water,...
8 MAREY GA10LP Power 10L 3.1 GPM Propane Gas Tankless Water Heater, Liquid, White MAREY GA10LP Power 10L 3.1 GPM Propane Gas Tankless Water Heater, Liquid, White
9 Ecosmart ECO 24 24 KW at 240-Volt Electric Tankless Water Heater with Patented Self Modulating... Ecosmart ECO 24 24 KW at 240-Volt Electric Tankless Water Heater with Patented Self Modulating...
10 EcoSmart 8 KW Electric Tankless Water Heater, 8 KW at 240 Volts with Patented Self Modulating... EcoSmart 8 KW Electric Tankless Water Heater, 8 KW at 240 Volts with Patented Self Modulating...
11 Ecosmart POU 3.5 Point of Use Electric Tankless Water Heater, 3.5KW@120-Volt, 6 x 11 x 3 Inch Ecosmart POU 3.5 Point of Use Electric Tankless Water Heater, [email protected], 6 x 11 x 3 Inch
12 Tankless Water Heater, GASLAND Outdoors BE158SN 6L 1.58GPM Propane Gas Water Heater, Overheating... Tankless Water Heater, GASLAND Outdoors BE158SN 6L 1.58GPM Propane Gas Water Heater, Overheating...
13 Marey ECO150 220V/240V-14.6kW Tankless Water Heater with Smart Technology, Small, White Marey ECO150 220V/240V-14.6kW Tankless Water Heater with Smart Technology, Small, White
14 Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
15 Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater
16 3000W Mini Water Heater 110V Electric Tankless Instant Hot Water Heater Thermostatic Washing Heating... 3000W Mini Water Heater 110V Electric Tankless Instant Hot Water Heater Thermostatic Washing...
17 Rinnai RL75iN Natural Gas Tankless Hot Water Heater, 7.5 GPM Rinnai RL75iN Natural Gas Tankless Hot Water Heater, 7.5 GPM
18 Mini Electric Tankless Water Heater - 110V Small Instant Hot Water Heater,Under Sink Plug in Water... Mini Electric Tankless Water Heater - 110V Small Instant Hot Water Heater,Under Sink Plug in...
19 Propane Tankless Water Heater On Demand Hot Water Heater Indoor Use, 7.0 GPM, 170,000 BTU 120V AC,... Propane Tankless Water Heater On Demand Hot Water Heater Indoor Use, 7.0 GPM, 170,000 BTU 120V...
20 Airthereal Electric Tankless Water Heater, 9kW, 240Volts - Endless On-Demand Hot Water - Self... Airthereal Electric Tankless Water Heater, 9kW, 240Volts - Endless On-Demand Hot Water - Self...
SaleBestseller No. 1
EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating...
  • Endless On-Demand Hot Water; Consistent hot water when you need it that never runs out; Continuously monitored water temperature and controlled flow...
  • Save Space; EcoSmart tankless electric water heaters are 90% smaller than traditional tank heaters; may be installed on wall or at point of use;...
  • Save Energy; EcoSmart tankless electric water heaters are 99% thermal energy efficient; Only heats water when called unlike a tank heater that...
  • EcoSmart ECO 11 Sizing; 13-kilowatt tankless electric water heater ideal for providing hot water for a bathroom, small sink, office breakroom and...
SaleBestseller No. 2
Ecosmart ECO Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self...
  • Endless on-Demand Hot Water; Consistent hot water when you need it that never runs out; Continuously monitored water temperature and controlled flow...
  • Save Space; EcoSmart tankless electric water heaters are 90% smaller than traditional tank heaters; may be installed on wall or at point of use;...
  • Save Energy; EcoSmart tankless electric water heaters are 99% thermal energy efficient; Only heats water when called unlike a tank heater that...
  • EcoSmart ECO 27 Sizing; Refer to the sizing map. Requires 3x40 AMP Double Pole Breaker, 27-kilowatt tankless electric water heater ideal...
  • Warranty and Certifications; Limited Lifetime Warranty on electronics, exchanger and element; UL-499 certified; ETL Listed
Bestseller No. 3
Tankless Water Heater Electric 5.5kw 240V, ECOTOUCH Point-of-Use Hot Water Heater Digital...
  • 【INSTANT & SUFFICIENT HOT WATER】Applied with 5.5KW heating system, the electric water heater supplies instant, consistent and endless hot water of...
  • 【SMART SELF ADJUSTMENT】The hot water heater adjusts power input based on flow rate and temp setting in real time. For example, less power will be...
  • 【CONVENIENT USE】The tankless water heater comes with digital display & touch control panel so temp setting is easy job. Now turn on the tap and...
  • 【SAFE and DURABLE】Applied with multiple protection devices, every piece goes through strict tests to ensure 100% safe. Inner water and electricity...
  • 【POINT of USE】The sleek tankless water heater is compact as an oatmeal box, making it possible to install anywhere close to outlet and avoid...
Bestseller No. 4
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
  • 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" NPT water connections
  • On demand, consistent and continuous hot water
Bestseller No. 5
Rheem 18kW 240V Tankless Electric Water Heater
  • External digital thermostatic control with LED display (+/1 degree accuracy)
  • Most advanced self-modulation, adjust power to meet hot water demand
  • Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
  • Simple installation – bottom 3/4 inch NPT water connections
  • Threaded for easy replacement, simple installation, digital temperature display
SaleBestseller No. 6
EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating...
  • The product is highly durable
  • The product is easy to use
  • Manufactured in China
  • Amperage (amps): 75. Activation flow: 0. 3 GPM. Flow Rate @ 35 F Rise (gallons/min): 3. 51 gal (US)/min
  • The product works and is compatible with 2 X 40 AMP (DP) breakers and 2 X 8 AWG wire
SaleBestseller No. 7
Stiebel Eltron 239223 Tankless Water Heater – Tempra 29 Plus – Electric, On Demand Hot Water,...
  • On demand a continuous and unlimited supply of hot water
  • Sleek design saves space and no venting required
  • Requires hard-wired 240 or 208-volt electric service, with a maximum draw of 28,800 watts at 240 volts or 21,600 watts at 208 volts
  • Requires 3 separate dedicated 40 amp breakers with 8 gauge copper wiring, and a minimum of 200 amp total service to the residence
Bestseller No. 8
MAREY GA10LP Power 10L 3.1 GPM Propane Gas Tankless Water Heater, Liquid, White
  • This unit is flow activate
  • Save up to 60% on electricity bills for water heating
  • Compact design saves space and is easy to install almost anywhere
  • No electrical connection is required so it's perfect alternative for those homes experiencing frequent power outages
  • Unlimited hot water whenever is needed
SaleBestseller No. 9
Ecosmart ECO 24 24 KW at 240-Volt Electric Tankless Water Heater with Patented Self Modulating...
  • Lifetime warranty
  • Save up to 60-percent on your water heating cost with an ECOSMART electric tankless water heater
  • Never run out of hot water with an ECOSMART tankless water heater
  • Patented Self Modulating Technology and design.Activation flow 0.3 GPM
  • ECOSMART tankless water heaters are 99.8-percent energy efficient
SaleBestseller No. 10
EcoSmart 8 KW Electric Tankless Water Heater, 8 KW at 240 Volts with Patented Self Modulating...
  • The product is highly durable
  • The product is easy to use
  • Manufactured in China
  • Heating elements are durable and are threaded for easy replacement
  • Activation Flow - 0.3 GPM
Bestseller No. 11
Ecosmart POU 3.5 Point of Use Electric Tankless Water Heater, [email protected], 6 x 11 x 3 Inch
  • Can provide hot water for one sink at 0.5 GPM in warmer climates
  • Requires 1 x 30 amp breaker and 10 AWG wire
  • For one sink at 0.5 GPM in colder climates the POU 6 is recommended
  • Amperage Draw 29 amp. kW - 3.5 kW
  • Connection Fittings 1/2" NPT
Bestseller No. 12
Tankless Water Heater, GASLAND Outdoors BE158SN 6L 1.58GPM Propane Gas Water Heater, Overheating...
  • 🎁【On Demand Hot Water】 Maximum power output 41,000BTU/Hr, get instant endless hot water easily wherever you are. No need to preheat before...
  • 🎁【CSA Approved Safety 】CSA approved Gasland tankless water heater, safe as per Canadian and US Standard. Flame failure device, anti-freezing...
  • 🎁【Energy Saving】 Compact and light weight structure with 11.5% energy saving technology. The propane water heater exchanger and main burner are...
  • 🎁【Lightweight Portable Design】 Compact size and lightweight design for easily carry. It can bring a amazing hot shower for you when you are...
  • 🎁【Excellent Customer Service】We have professional team to offer you excellent service. If you have any question, please feel free to contact us...
SaleBestseller No. 13
Marey ECO150 220V/240V-14.6kW Tankless Water Heater with Smart Technology, Small, White
  • Unit requires 220v~240v and (1) 70 amp double pole breaker. Minimum Activation Rate 0.50 GPM
  • ETL approved
  • Smart technology: easy management and simple adjustments on a LCD panel allows you to program the exact desired water temperature thereby optimizing...
  • Flow switch activation mechanism allows the unit to produce constant temperatures with as little as . 5Gpm/5Psi
  • Tankless water heaters provide an efficient hot water solution eliminating the stand-by energy consumption of conventional tank units
Bestseller No. 14
Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
  • External adjustable digital thermostatic control with LED display (+/1 degree accuracy
  • Durable Copper immersion two heating elements, field Serviceable.Self-modulating power control
  • Simple installation – 1/2 NPT adapters included; side 1/2 inch Compression water connections
  • 99.8% energy efficient. External controls to adjust temperature in increments of 1°f. Water-Saver Shower Head – 1.5 GPM
  • Threaded for easy replacement, simple installation, digital temperature display 54 A. 13kW Model Flow Rate: up to 3.17 GPM
SaleBestseller No. 15
Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater
  • Sleek and compact design with digital output temperature display
  • ECOSMART tankless water heaters are 99.8-percent energy efficient
  • Manufactured in United States
  • Pipe Fittings:3/4 inch NPT
  • Required Breaker:4 x 40 A
Bestseller No. 16
3000W Mini Water Heater 110V Electric Tankless Instant Hot Water Heater Thermostatic Washing Heating...
  • 【Safe to Use】Our domestic tankless electric water heaters have been rigorously tested and have multiple protection functions: water and...
  • 【Instant Heating & Constant Temperature】3000W high-efficiency output mini water heater, fast heating in 3 seconds, constant temperature to...
  • 【Easy to Install】The home water heater has a mini body, easy to install in the bathroom, kitchen, and under the sink.Standard 1/2 interface(inflow...
  • 【Application】Comfortable water temperature, suitable for washing food, bowls, clothes, face, hands, etc. (Only suitable for summer showers)
  • 【Health Care】Washing hands and face frequently with hot water can effectively prevent various diseases such as colds and make the body healthier....
SaleBestseller No. 17
Rinnai RL75iN Natural Gas Tankless Hot Water Heater, 7.5 GPM
  • Original Design: Tankless hot water heater's Circ-Logic technology offers recirculation patterns that match your habits; For the latest in...
  • Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: Non-condensing tankless hot water heater from Rinnai is only the size of a...
  • Smart, Durable Design: Includes 12-, 5-, and 1-year residential guarantee and 5-, 5-, and 1-year commercial factory warranty for heat exchanger,...
  • Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your...
  • Find Your Rinnai: See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater for...
Bestseller No. 19
Propane Tankless Water Heater On Demand Hot Water Heater Indoor Use, 7.0 GPM, 170,000 BTU 120V AC,...
  • Tankless Water Heater: No need to wait 30 minutes for preheating and limited use of hot water like with a tank water heater. Tankless for endless hot...
  • Satisfy Whole Family: With 7.0 GPM and 170,000 BTU heating capacity through propane gas intake, it is suitable for 3-4 outlets for the whole family....
  • Multiple Safety Protection: CSA certified in the United states and Canada. The tankless gas water heater indoor features multi safety protections:...
  • Excellent Quality and Design: The compact design effectively saves floor space, which also makes it easier to install.
  • Quality Service: Fogatti offers 2 years of service and you can contact us directly by email if you encounter any problems. We will sincerely solve any...
Bestseller No. 20
Airthereal Electric Tankless Water Heater, 9kW, 240Volts - Endless On-Demand Hot Water - Self...
  • ☼ Endless Hot Water: Imagine you are the last one in your family to take a shower before heading out for the day. You turn on the faucet and the...
  • ☼ Save Space: That water heater in the basement or utility closet takes up a ton of space. This wall-mounted water heater uses 90% less space than a...
  • ☼ Save Energy: Water is only heated when you need it, not stored in a hot water tank. The self-modulating temperature technology only uses energy to...
  • ☼ Important Note: In order to install 9kW Electric Tankless Water Heater it would requires 240 Voltage, 40 AMP Circuit Breaker Size. Please check to...
  • ☼ Safe To Use: With high temp protection, dry heating protection, and electrical leakage protection you can rest easily knowing you have safe,...

Having trouble finding a great tankless water heaters?

This problem is well understood by us because we have gone through the entire tankless water heaters research process ourselves, which is why we have put together a comprehensive list of the best tankless water heaterss available in the market today.

After hours of searching and using all the models on the market, we have found the best tankless water heaters for 2023. See our ranking below!

How Do You Buy The Best Tankless Water Heaters?

Do you get stressed out thinking about shopping for a great tankless water heaters? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching tankless water heaters, which is why we have assembled a comprehensive list of the greatest tankless water heaters available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for tankless water heaters that you consider buying. Your questions might include the following:

  • Is it worth buying an tankless water heaters?
  • What benefits are there with buying an tankless water heaters?
  • What factors deserve consideration when shopping for an effective tankless water heaters?
  • Why is it crucial to invest in any tankless water heaters, much less the best one?
  • Which tankless water heaters are good in the current market?
  • Where can you find information like this about tankless water heaters?

We’re convinced that you likely have far more questions than just these regarding tankless water heaters, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for tankless water heaters, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible tankless water heaters. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an tankless water heaters buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available tankless water heaters currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of tankless water heaters has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an tankless water heaters?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your tankless water heaters.
  5. Customer Ratings: Number ratings grade tankless water heaters objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their tankless water heaters.
  7. Product Quality: You don’t always get what you pay for with an tankless water heaters, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an tankless water heaters is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining tankless water heaters information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding tankless water heaters is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

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