10 Best Tankless Water Heater of 2026

Last updated on 04/05/2026
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Best Choice
1
9.7
Exceptional
Save 33%
Tankless Water Heater, Novieex On Demand Water Heater Natural Gas, Up to 4.3 GPM, 100,000 BTU Instant Hot Water Heater with LED Display, Indoor Installation, 2-4 Point Use for Family Bathroom Kitchen
NOVIEEX

Tankless Water Heater, Novieex On Demand Water Heater Natural Gas, Up to 4.3 GPM, 100,000 BTU Instant Hot Water Heater with LED Display, Indoor Installation, 2-4 Point Use for Family Bathroom Kitchen

33% Off
Why we love it
  • Reliable hot water on demand.
  • Precise temperature control guaranteed.
  • Compact design saves space.
Main Highlights
  • 【Note 】 This 4.3GPM on demand water heater requires natural gas
  • 【Reliable Hot Water on Demand】 With 100,000 BTU power, this on demand water heater delivers up to 4.3 GPM instant hot water. You can comfortably run a shower, kitchen faucet, and bathroom sink simultaneously—all without any noticeable temperature drop.
  • 【Precise Temperature Control】 Enjoy consistent water temperature with a wide adjustable range from 95°F to 149°F, ±1℉ temperature control . The built-in digital thermostat of the tankless water heater ensures your water stays at the desired setting, delivering comfort and safety for every shower and household task.
  • 【High Efficiency, Lower Bills】 Say goodbye to the energy and electricity waste of traditional heaters that reheat water nonstop. By leveraging a selectional burner system, our tankless water heater gas precisely adjusts the flame for the water temperature. You will see a noticeable drop in your energy bills, making it an efficient and cost-effective choice.
  • 【All-Round Security System】Our built-in multi-protection system safeguards against gas leaks, overheating, dry-firing, and freeze damage, offering ultimate safety and comfort for families with temperature-sensitive elderly or kids with delicate skin.
  • 【Compact & Space-Saving】Compared to bulky traditional tanks, our natural gas on demand water heater is wall-mounted, saving over 50% of space and blends seamlessly into utility rooms, basements, or closets. Its sleek appearance and LED touchscreen interface allow for easy and intuitive operation.
  • 【Usage Reminder】 For safe and efficient use, this indoor on demand water heater requires natural gas and professional installation by a licensed technician using 1/2" NPT fittings (Exhaust pipe included).
9.7
Exceptional
Save 33%
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Best Value
2
9.5
Superb
Westinghouse 14kW 240V Smart WiFi Tankless Water Heater Electric, Compatible with Alexa & Google Home, ETL Certified, IPX4, Gray - Upgrade (APOLO-2.0)
Westinghouse

Westinghouse 14kW 240V Smart WiFi Tankless Water Heater Electric, Compatible with Alexa & Google Home, ETL Certified, IPX4, Gray - Upgrade (APOLO-2.0)

Why we love it
  • Instant hot water on demand.
  • Smart Wi-Fi voice control features.
  • Compact design saves valuable space.
Main Highlights
  • 【IMPORTANT NOTES】up to 3.38 GPM for APOLO-14kW. Activation flow: 0.5 GPM. Amperage (amps): 59A. The product works and is compatible with 1 X 60 AMP (DP) breakers and 1 X 6 AWG wire. Bottom 1/2" NPT water connections
  • 【INSTANT HOT WATER 】 Westinghouse 14kW electric tankless water heater delivers continuous hot water on demand — perfect for simultaneous use at 1 shower + 1 sink. Eliminate waiting time and temperature fluctuations during showers, dishwashing, or handwashing.
  • 【SMART WI-FI VOICE CONTROL】 Control water temperature remotely via the app or voice commands (Alexa & Google Home compatible). Adjust settings from 86°F to 140°F in 1° increments. The LED display shows real-time status for easy monitoring.
  • 【ETL SAFETY CERTIFIED & DURABLE DESIGN】 ETL certified with 4-layer protection (leakage, overheat, dry-fire, high voltage). Features separate water-electricity pathways to prevent corrosion and scaling, ensuring low maintenance and extended lifespan.
  • 【SPACE-SAVING & EASY INSTALLATION】 Compact design (14.2" H x 9.5" W x 3.5" D) mounts flush to walls, freeing floor space. Includes 1/2" NPT connections and 60A breaker compatibility.
  • 【PERFECT FOR APARTMENTS & HOMES】 This 14kW, 240V electric tankless water heater efficiently delivers up to 3.38 GPM flow, providing consistent hot water for 1 to 3 points of use simultaneously in apartments, homes, or offices.
9.5
Superb
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3
9.3
Superb
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

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

Why we love it
  • Versatile indoor and outdoor installation.
  • Compact yet powerful design.
  • High energy efficiency rating.
Main Highlights
  • 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
9.3
Superb
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4
9.2
Superb
FOGATTI Natural Gas Tankless Water Heater Outdoor - Max 8.1 GPM 180,000 BTU, CSA Certified Compact Design On Demand Instant Hot Water Heater - Instagas Comfort 180S Series, New Upgraded
FOGATTI

FOGATTI Natural Gas Tankless Water Heater Outdoor - Max 8.1 GPM 180,000 BTU, CSA Certified Compact Design On Demand Instant Hot Water Heater - Instagas Comfort 180S Series, New Upgraded

Why we love it
  • Instant hot water on demand.
  • Durable design for outdoor use.
  • Precise temperature control technology.
Main Highlights
  • Instant Hot Water: Say goodbye to preheating delays! FOGATTI tankless water heater delivers continuous hot water instantly, powered by 180,000 BTU and up to 8.1 GPM flow rate. Whether it’s for showers, sinks, or appliances, even for 3-5 outlet points, it ensures uninterrupted hot water
  • Built for Outdoor Durability: Designed specifically for outdoor installation, this tankless water heater gas features a remote control panel for convenient indoor operation. The bottom-mounted fan enhances safety, durability, and lifespan by preventing smoke backflow and ensuring stable combustion, making it reliable in all seasons
  • Precision Temperature Control: With advanced water servo technology and temperature sensors, the tankless gas water heater precisely adjusts water flow and gas intake to maintain a temperature difference within ±1℉. The four-stage combustion system ensures consistent comfort, whether it’s a chilly winter or a hot summer
  • Quick and Easy Installation: The compact design measuring 26.2 x 17.1 x 7.1 inches makes installation hassle-free. The gas tankless water heater is compatible with low water pressure from 15-150 PSI, ensuring smooth operation even in areas with weaker water pressure. Simply connect to a standard 120V AC for seamless operation
  • Trusted Quality and Support: Built with a high-efficiency oxygen-free copper heat exchanger and 304 stainless steel burner, this tankless water heater gas outdoor offers exceptional durability and performance. Certified by CSA and equipped with multiple safety features, it meets the highest safety standards, ensuring reliable and secure operation
  • Reliable Protection and Support: FOGATTI water heater includes 2 years of full coverage for the entire unit and 5 years of coverage for the heat exchanger. Our dedicated customer support team is ready to assist with any questions or concerns, providing peace of mind for you
  • Note: Natural gas tankless water heater is equipped with active heating anti-freeze device, If enviroment temp drop below 5℉ or not be used for long period, drain the water inside to prevent damage. For optimal performance, recommended for use below 2000 feet altitude
9.2
Superb
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5
9.1
Superb
Rheem RRTGH84DVLN3701171 Rheem RTGH Series 8.4 GPM 157,000 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless Steel
Rheem

Rheem RRTGH84DVLN3701171 Rheem RTGH Series 8.4 GPM 157,000 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless Steel

Why we love it
  • Versatile flow rate options available.
  • Customizable temperature settings provided.
  • Comprehensive warranty for peace of mind.
Main Highlights
  • Flow rate of 0.4 - 8.4 GPM
  • Available temperature settings range from 100 to 140F (default setting of 120F)
  • Includes electric ignition
  • Covered under 1 year labor, 15 year heat exchanger, and 5 year parts manufacturer warranties
  • Width 17-11/16-in
9.1
Superb
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6
9.0
Superb
Save 5%
Propane Tankless Water Heater Outdoor, 5.2 GPM 130000 BTU On Demand Hot Water Heater with Remote Control, 110V Residential Instant Propane Waterheater
STPFFOT

Propane Tankless Water Heater Outdoor, 5.2 GPM 130000 BTU On Demand Hot Water Heater with Remote Control, 110V Residential Instant Propane Waterheater

5% Off
Why we love it
  • Instant hot water anytime.
  • Space-saving outdoor installation.
  • Advanced safety features included.
Main Highlights
  • LOW DEMANDS, HIGH STANDARDS - This propane water heater deliver up to 5.2 GPM of instant hot water, capable of supplying 2-4 water outlets simultaneously. The 0.7 GPM minimum water flow requirement ensures reliable use even in low water pressure areas and high-rise buildings
  • WISE WATER SUPPLY CHOISE - A tankless on demand water heater lets you say goodbye to those torturous waiting times. Installed outdoors, they save space and reduce safety risks. Propane water heaters are more energy-efficient than electric heaters, wise money-saving decision
  • BUILT FOR ALL-WEATHER - The on demand hot water heater is constructed with a thickened corrosion-resistant body, stainless steel vent, variable frequency fan, and a wind-resistant system, providing windproof, freeze-proof, and IPX5 waterproof protection
  • FOUR SEASONS SAME TEMP - This propane tankless water heater is equipped with an advanced thermostat system for precise temperature control (temp fluctuation ±1°F). The seven-segment layered combustion technology ensures consistent water temperature throughout the year
  • EFFORTLESS SETUP AND OPERATION - Once installed, just press the power button and turn on the hot water tap to enjoy instant hot water. The included controller (15ft wire) allows you to easily adjust the water temperature from indoors. The water outlet/inlet and gas inlet use standard 3/4” NPT connectors
  • SAFETY ALWAYS FIRST - Features include flame failure protection, overtime use protection, overheating protection, fan failure protection, anti-dry burning, and exhaust pipe blockage protection. We care about both the efficiency of our products and customers' safety. CSA certified, 2-Year warranty
  • NOTE: This device is ignited by electricity via a 4-foot 110V electrical cord plug. Please ensure that there is a power outlet at the installation location
9.0
Superb
Save 5%
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7
9.0
Superb
Save 5%
Rheem 11kW 240V Tankless Electric Water Heater
Rheem

Rheem 11kW 240V Tankless Electric Water Heater

5% Off
Why we love it
  • Precise temperature control available.
  • Energy-efficient self-modulating technology.
  • Instantaneous hot water on demand.
Main Highlights
  • ON/OFF Dial Control with adjustable digital temperature display
  • Self-modulating power control
  • 11kW Model Flow Rate: up to 2.68 GPM
  • Side 1/2" NPT water connections
  • On demand, consistent and continuous hot water
9.0
Superb
Save 5%
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8
8.8
Excellent
Save 35%
EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology , 17 x 14 x 3.5, White
EcoSmart

EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology , 17 x 14 x 3.5, White

35% Off
Why we love it
  • Efficient 18 kW power output.
  • Digital temperature control feature.
  • Versatile for 50/60 Hz systems.
Main Highlights
  • Configured for climates where incoming water temperature is 62 degrees F and above.
  • Capable of heating over 2.5 gpm.
  • Digital temperature control allows temperature settings in 1 degree increments.
  • Voltage: 240
  • Single phase
8.8
Excellent
Save 35%
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9
8.7
Excellent
Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
Rheem

Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY

Why we love it
  • Precise temperature control available.
  • Efficient energy usage guaranteed.
  • Simple installation and maintenance.
Main Highlights
  • 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
  • 54 A
8.7
Excellent
Amazon Logo
10
8.7
Excellent
Save 17%
ORBEK ORBEK 60,000 BTU RV Tankless Water Heater, Ideal for RV Families & Campers, Propane Gas On-Demand Instant Hot Water Heater, 12V DC, CSA Certified, with Remote Control, Compatible with All RVs
Orbek

ORBEK ORBEK 60,000 BTU RV Tankless Water Heater, Ideal for RV Families & Campers, Propane Gas On-Demand Instant Hot Water Heater, 12V DC, CSA Certified, with Remote Control, Compatible with All RVs

17% Off
Why we love it
  • Instant hot water on demand.
  • Energy-efficient and eco-friendly design.
  • Safe and reliable for use.
Main Highlights
  • 𝐈𝐧𝐬𝐭𝐚𝐧𝐭 𝐇𝐨𝐭 𝐖𝐚𝐭𝐞𝐫 𝐒𝐮𝐩𝐩𝐥𝐲: Orbek delivers 60,000 BTU of heat output per minute, making it ideal for meeting the demands of busy RV families. The tankless water heater features a burner that activates only when hot water is needed—such as for showers, dishwashing, or handwashing—thereby conserving energy. Unlike tank-type water heaters, there's no waiting for water to heat up, and no need for frequent anode rod replacements
  • 𝐇𝐢𝐠𝐡-𝐏𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞 𝐓𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐲: Equipped with oxygen-free copper heat exchangers and brushless DC fans, it adapts to high altitudes, ensuring smooth operation even when you drive the RV to the Denver Plateau at an altitude of 9,800 feet. Staged combustion technology maintains consistent temperatures by minimizing cold spots and scalding, while conserving precious propane resources during RV travel. Enjoy endless hot water—simply add cold water to achieve your desired temperature
  • 𝐂𝐨𝐦𝐩𝐥𝐞𝐭𝐞 𝐑𝐕 𝐖𝐚𝐭𝐞𝐫 𝐇𝐞𝐚𝐭𝐞𝐫 𝐑𝐞𝐩𝐥𝐚𝐜𝐞𝐦𝐞𝐧𝐭: Available in black or white with three door options, easily retrofits RV electric water heaters and RV instantaneous water heaters. Installation requires 15" x 15", 15" x 18", or 18" x 18" dimensions, sold separately. Orbek RV Tankless Water Heater is compatible with other tankless water heater brands, making it the ideal upgrade or replacement for your RV
  • 𝐒𝐚𝐟𝐞𝐭𝐲 𝐚𝐧𝐝 𝐑𝐞𝐥𝐢𝐚𝐛𝐢𝐥𝐢𝐭𝐲: The tankless RV water heater is CSA certified and features multiple safety protections, including a built-in forced-draft exhaust fan at the top for stable combustion and automatic gas shut-off in case of unexpected flame failure. Frost protection ensures the system operates reliably even in cold weather
  • 𝐔𝐩𝐠𝐫𝐚𝐝𝐞𝐝 𝐕𝐞𝐫𝐬𝐢𝐨𝐧: Orbek has always thought of you, featuring a built-in high-quality 150 PSI pressure-reducing valve so you don't need to make additional purchases or visit hardware stores frequently, saving you time and money. The smart remote control effortlessly adjusts water temperature from 95°F to 123°F. It also displays error codes for quick troubleshooting, making operation simple and stress-free
  • 𝐈𝐧𝐬𝐭𝐚𝐥𝐥𝐚𝐭𝐢𝐨𝐧 𝐚𝐧𝐝 𝐎𝐩𝐞𝐫𝐚𝐭𝐢𝐨𝐧 𝐀𝐬𝐬𝐢𝐬𝐭𝐚𝐧𝐜𝐞: The RV water heater is CSA certified. During installation, ensure the RV's voltage is 12V, you just need to stick it on your RV, mark the drilling locations according to the instructions, and then secure the water heater with screws. You can also install it yourself without hiring a professional. We have a professional service team and offer 24-month service support, dedicated to serving you
8.7
Excellent
Save 17%
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Related Deals You Might Like for Tankless Water Heater

📊We scanned 283 products
🔍
We reviewed the most relevant Tankless Water Heater offers across Amazon and leading retailers, covering major brands and models. Our shortlist features trusted names like NOVIEEX, Westinghouse, Rinnai, FOGATTI, Rheem, STPFFOT, EcoSmart, Orbek, known for dependable quality and smart design.
⭐
To determine today's best Tankless Water Heater , we analyzed 1416 real customer and expert reviews, focusing on satisfaction, real-world performance and long-term reliability. We also weigh each review's relevance, authenticity and freshness for a fair comparison.

Here's what we found:

🏆 #1
Tankless Water Heater, Novieex On Demand Water Heater Natural Gas, Up to 4.3 GPM, 100,000 BTU Instant Hot Water Heater with LED Display, Indoor Installation, 2-4 Point Use for Family Bathroom Kitchen

Our overall winner is Tankless Water Heater, Novieex On Demand Water Heater Natural Gas, Up to 4.3 GPM, 100,000 BTU Instant Hot Water Heater with LED Display, Indoor Installation, 2-4 Point Use for Family Bathroom Kitchen by NOVIEEX. It stands out for the right balance of quality, performance and value.

✨ What sets it apart:
✓Reliable hot water on demand.
✓Precise temperature control guaranteed.
✓Compact design saves space.
💎 Best Value
Westinghouse 14kW 240V Smart WiFi Tankless Water Heater Electric, Compatible with Alexa & Google Home, ETL Certified, IPX4, Gray - Upgrade (APOLO-2.0)

The best value for most shoppers is Westinghouse 14kW 240V Smart WiFi Tankless Water Heater Electric, Compatible with Alexa & Google Home, ETL Certified, IPX4, Gray - Upgrade (APOLO-2.0) by Westinghouse, with consistently high satisfaction across expert and customer reviews.

💰 Best Deal
EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology , 17 x 14 x 3.5, White

The strongest deal right now for Tankless Water Heater is EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology , 17 x 14 x 3.5, White at EcoSmart, currently at 35% off.

🔄Our Tankless Water Heater ranking is updated regularly to reflect new releases and price changes—check back for the latest picks and deals.