March 19, 2026
10 Best 10 Gpm Electric Tankless Water Heater of 2026
Last Updated - March 19, 2026
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Our Rankings
Ranein
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GEN II Ranein Tankless Water Heater Electric, 27kW 240V On Demand Instant Endless Water Heater with Temperature Display, Control Knob, Up to 6.5 GPM for Whole House Water
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Why We Love It
- Important: 27 kW 240 V tankless electric water heater unit requires 3 dedicated 240 V circuits (3 × 40 A double-pole breakers + 3 × 8 AWG cables). Product size: 13.8" × 3.1" × 18.7". Water connection: 3/4" NPT.
- Powerful Performance: With 99% thermal efficiency and a 6.5 GPM flow rate, this 27 kW model handles 24 household water points with no sweat. No waiting for preheatingjust endless hot water, whenever you need it.
- Save Energy & Space: Unlike tank heaters, it skips preheatingno energy wasted when idle, slashing heating costs by 60%. Its compact design installs easily anywhere, saving way more space than traditional tanks. Plus, it delivers instant hot water on demand.
- Intuitive Precision Control: Adjust temperatures seamlessly (86°F to 131°F in 1°F steps) via tactile knobs and LED display. Set your ideal heat once for consistent, stable output every use.
- Safe & Certified: CSA-certified (meets US/Canadian standards), its got leakage protection, overheat safeguards, drop-tested durability, and a damp-proof design. Every unit passes strict testing for 100% safety; stainless steel elements keep scale from building up, too.
- Instant Hot Water Experience: Equipped with rapid heating technology, it delivers near-instant hot water, minimizing wait time. Enjoy comfortable hot water on demand whenever you need it.
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WINTEMP
WINTEMP 36kW Tankless Electric Water Heater 240V, Instant On-Demand Endless Hot Water, Up to 8.7 GPM, LED Temperature Display, Whole House Supply, WiFi Control, ETL Certified
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Main Highlights
- Important Note: Please ensure this tankless water heater meets your installation requirements. The WN36 model is rated at 36KW (240V) with a maximum current draw of 150A. It requires 4 x 40 Amp double-pole (DP) breakers and 4 x 8/2 AWG cables with ground. A 300A household power supply is recommended. Unit dimensions: 13.7 (W) x 21.1 (H) x 5.3 (D). Water connection: 3/4" NPT
- Stable Water Temperature: Automatically adjusts energy consumption based on incoming water temperature and flow rate to ensure maximum efficiency, a consistently stable temperature, and optimal power usage. With a maximum hot water output of 8.7 gallons per minute, its ideal for residential showers no need to wait for preheating, no risk of running out of hot water, and no more temperature fluctuations during your shower
- Energy Saving: The self-regulating technology adjusts power input based on real-time flow and temperature settings. When the water flow decreases, the system reduces power usage, and when not in use, it consumes no energy, achieving up to 99% energy savings, suitable for 3-5 usage points in the home
- Space Saving: The WN36 features a wall-mounted compact design, occupying 90% less space compared to traditional tank water heaters. It is suitable for tight areas and can be easily installed anywhere. It provides an endless supply of hot water in a short time without the need to wait for preheating. Equipped with remote WiFi control, you can adjust the temperature without being near the water heater
- Safe Usage: Safety is always WINTEMPs top priority. The product features multiple safety protections, including leakage protection, overheat protection, and dry-fire protection, and is ETL certified to fully ensure your safety, allowing you to enjoy hot water anytime, anywhere with peace of mind. We also provide a 2-year return and exchange warranty along with long-term professional technical support to give you worry-free use
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Our Rankings
Rheem
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
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Main Highlights
- ELECTRICAL REQUIREMENTS: 3 x 40 AMP Double Pole Breakers Required. 200 AMP Household service recommended. Ensure your home can accomodate the power supply and that enough space is available in your breaker panel for this unit. RTEX-24 model is 100A, 24kw, 240V.
- PROVEN PERFORMANCE: Continuous hot water when you need it for the whole home (review performance guide image to confirm this water heater will provide the hot water needed based on geographic location). Ground water temperature impacts temperature rise and gallons per minute.
- EASILY ADJUSTABLE: ON/OFF Dial Control with adjustable digital temperature display allows for adjustments in 1-degree increments from 80-140 degrees F.
- EFFICIENT: Tankless electric water heaters save space, energy, money, and require no venting.
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Our Rankings
Rheem
Rheem 18kW 240V Tankless Electric Water Heater, Gray
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Main Highlights
- 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
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Our Rankings
Rheem
Rheem RTG-84XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater 8.4 GPM, 180,000 BTUs
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Main Highlights
- High-efficiency tankless gas water heater delivers up to 8.4 GPM, perfect for 23 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 watereven during peak household demand.
- Designed for outdoor installation, this high-efficiency tankless natural gas water heater features a durable metal cabinet and supports easy wall mounting by a qualified installer.
- Hot-start programming prevents cold water bursts, making this tankless natural gas water heater ideal for back-to-back showers.
- Rheem RTG tankless gas water heaters offer high-efficiency, space-saving designs with multiple models to fit any home size, fuel type, and hot water demand.
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Our Rankings
Rheem
Rheem 11kW 240V Tankless Electric Water Heater
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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
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Rinnai
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
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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 10 GPM (6 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
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Our Rankings
AIRTHEREAL
Airthereal Electric Tankless Water Heater, 27kW, 240Volts - Endless On-Demand Hot Water - Self Modulates to Save Energy Use - Small Enough to Install Anywhere - for 3 Showers, Evening Tide series
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Main Highlights
- Endless Hot Water: Imagine being the last one in your family to take a shower before heading out for the day. You turn on the faucet and the water is freezing cold. With the Airthereal Electric Tankless Water Heater, you'll have endless hot water on demand with no preheating required. No more worrying about running out of hot water in the tank or experiencing temperature fluctuations in the middle of your shower.
- Save Space: This wall-mounted water heater is perfect for saving space. It uses 90% less space than a traditional hot water heater with a tank, which means you can use the extra space for other things.
- Save Energy: The self-modulating temperature technology only heats up water when you need it, which means you won't be wasting energy by storing hot water in a tank. You can save up to 50% on water heating energy compared to a typical tank water heater.
- Safe To Use: Safety is always a top priority with Airthereal. With high temp protection, dry heating protection, and electrical leakage protection you can rest easily knowing you have safe, on-demand hot water. The electric and fluid systems are completely separated to prevent electric leakage and water pipe corrosion.
- Important Note: In order to install the 27kW Electric Tankless Water Heater you'll need access to 240 voltage, 3x 40A Double Pole Circuit Breaker and 3x 8AWG/2 Wires. Please make sure to check your breaker panel to confirm that it meets these specifications before installing.
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Our Rankings
Rheem
Rheem RTGH-95DVLN-3 RTGH Series 9.5 GPM 199,900 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless Steel
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Main Highlights
- Flow rate of 0.4 - 9.5 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
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Our Rankings
Westinghouse
Westinghouse 14kW 240V Smart WiFi Tankless Water Heater Electric, Compatible with Alexa & Google Home, ETL Certified, IPX4, Gray - Upgrade (APOLO-2.0)
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Main Highlights
- IMPORTANT NOTESup 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.