· Mason Everett · Reviews · 10 min read
10 Best Tankless Water Heaters 2026
Finding the perfect on-demand water heater can feel overwhelming with so many options available.
That’s why we’ve rigorously evaluated dozens of models based on crucial criteria like performance, quality, durability, and overall value.
Our comprehensive review of the 10 Best Tankless Water Heaters focuses on delivering endless hot water efficiently, highlighting energy-saving designs that are better for your wallet and the environment.
This guide is designed to cut through the noise, providing clear insights and expert recommendations to help you make an informed decision and find the ideal unit for your home’s unique needs.
Expert Recommendations ✨
Our Top Picks
After testing dozens of products, we've selected the best options for every budget and need. Each recommendation has been thoroughly evaluated for performance, durability, and value.
Rinnai RX180iN Condensing Gas Heater
This unit stands out for its incredible versatility, operating on either natural gas or propane and installable indoors or out. Its high 10 GPM flow rate makes it perfect for large families.
EcoSmart ECO 11 Electric Heater
For smaller homes or point-of-use applications, the EcoSmart ECO 11 offers exceptional value. It is incredibly compact, energy-efficient, and provides consistent hot water on demand.
APUS 8.1 GPM Propane Heater
Engineered for outdoor installation, this APUS model boasts WiFi control and a robust, weather-resistant design. Its high BTU output ensures plenty of hot water for multiple outlets at once.
Rheem RTGH Series Indoor Gas Heater
Rheem delivers premium performance with this indoor natural gas unit. It offers a high 8.4 GPM flow rate and is backed by an excellent manufacturer warranty for long-term peace of mind.
GE 10 Gallon Electric Heater
While technically a mini-tank, this GE unit is perfect for boosting hot water at a specific fixture or as a standalone for a small sink. Its plug-and-play design makes installation incredibly simple.
Rheem 18kW Electric Tankless Heater
This Rheem electric model provides a great balance of power and value. Advanced self-modulation technology adjusts power to meet demand, ensuring energy efficiency and stable temperatures.
SIVUATEK 14kW Electric Heater
Ideal for apartments or small homes, this compact SIVUATEK heater delivers instant hot water efficiently. Its smart power adjustment and multiple safety features make it a reliable choice.
A. O. Smith 10 GPM Gas Heater
Built for durability and high output, this A. O. Smith outdoor model features a commercial-grade copper heat exchanger. It effortlessly supplies hot water for large homes, even in colder climates.
WINTEMP 27kW WiFi Electric Heater
For those committed to an all-electric home, this powerful WINTEMP unit is the answer. It delivers an impressive 6.3 GPM and features WiFi control for ultimate convenience and energy management.
ORBEK 14kW Instant Hot Water Heater
This Orbek model offers fantastic features at an accessible price point. It heats water in just 3 seconds, includes comprehensive safety protections, and has a clear LED display for easy operation.
10 Best Tankless Water Heaters
Upgrading to a tankless water heater is a game-changer for any household, promising endless hot water and significant energy savings. But choosing the right one is key to unlocking these benefits. Below, we dive deep into our top 10 picks, each selected for its unique strengths and ability to deliver exceptional performance.
Rinnai RX180iN Condensing Gas Heater
Most Versatile High-Performance Heater
The Rinnai RX180iN redefines flexibility in home water heating.
Its standout feature is the dual-fuel capability, effortlessly running on either natural gas or propane thanks to its Smart Sense gas control system.
This adaptability extends to its installation, as it can be mounted indoors or outdoors with the appropriate venting.
With a powerful 180,000 BTU output, it delivers up to 10 gallons per minute, easily supplying multiple bathrooms and appliances simultaneously without a drop in temperature.
The unit's condensing technology achieves an ultra-high energy efficiency of 0.98 UEF, translating to significant savings on your utility bills.
It's the ideal choice for large households that demand high performance, reliability, and the freedom to choose their fuel source and installation location.
A Quick Flush feature also simplifies maintenance, ensuring long-term performance.
Product Specs
| BTU Input | 180,000 |
| Max Flow Rate | 10 GPM |
| Fuel Type | Natural Gas / Propane |
| Energy Factor (UEF) | 0.98 |
| Installation | Indoor / Outdoor |
| Dimensions | Suitcase-sized |
Features
- Dual-Fuel Capability: Smart Sense system works with Natural Gas or Propane automatically.
- Indoor/Outdoor Installation: Versa Vent technology allows for flexible placement.
- High Flow Rate: Delivers up to 10 GPM, supporting up to 6 fixtures at once.
- Exceptional Efficiency: Condensing technology provides a 0.98 Uniform Energy Factor (UEF).
- Compact Design: Saves significant space compared to traditional tank heaters.
- Easy Maintenance: Features a Quick Flush system for simplified descaling and service.
What We Like
- Extremely versatile fuel and installation options
- Market-leading energy efficiency
- Sufficient flow rate for large homes
- Reputable brand with strong support
- Smart features for easy operation
What We Don't Like
- Professional installation is highly recommended
- Higher initial cost compared to some models
- Outdoor vent cap sold separately
Why We Selected This Product
We selected the Rinnai RX180iN as our top pick because of its unparalleled versatility and power.
During our evaluation, its ability to maintain a high flow rate across multiple fixtures was impressive.
The Smart Sense technology that auto-configures the fuel type is a revolutionary feature that simplifies selection and installation.
Its robust build quality and leading energy efficiency score solidified its position as the best overall choice for homeowners seeking a future-proof, high-capacity solution.
User Experience
Users consistently praise the Rinnai RX180iN for its endless supply of hot water, even in homes with high demand.
Many highlight the noticeable reduction in their energy bills after switching from a traditional tank heater.
The compact, suitcase-sized design is another frequently mentioned benefit, freeing up valuable space in utility closets or basements.
While professional installation is recommended, users find the easy-to-use interface and smart features to be highly convenient for daily operation and maintenance.
EcoSmart ECO 11 Electric Heater
Best for Compact Point-of-Use Applications
The EcoSmart ECO 11 is a powerhouse in a tiny package, making it the perfect solution for point-of-use applications or small homes in warmer climates.
Its patented self-modulating technology is a key feature, as it adjusts energy consumption based on water flow, ensuring you only use the power you need.
This results in up to 99% thermal energy efficiency and significant cost savings.
The unit is 90% smaller than a traditional tank heater, allowing it to be installed in tight spaces like under a sink or in a small closet.
It's ideal for supplying a single shower and a sink simultaneously in warmer regions, or for a bathroom or office breakroom in colder climates.
The consistent temperature output, within 1 degree of your setting, means no more surprise cold shocks.
For budget-conscious buyers or those with limited space, the ECO 11 is an unbeatable value.
Product Specs
| Power | 13KW at 240V |
| Amperage Draw | 54 A |
| Max Flow Rate | 3.1 GPM (in warm climates) |
| Dimensions | 11.5 x 8 x 3.75 inches |
| Water Connections | 1/2 inch CF |
Features
- Self-Modulating Technology: Adjusts energy use based on real-time hot water demand.
- Ultra-Compact Design: 90% smaller than tank heaters for installation anywhere.
- High Thermal Efficiency: Achieves up to 99% efficiency, minimizing energy waste.
- Consistent Temperature: Maintains water temperature within 1 degree of the set point.
- Point-of-Use Sizing: Ideal for low-flow applications like a bathroom or small sink.
What We Like
- Very affordable initial cost
- Extremely energy and space efficient
- Easy to install for point-of-use needs
- Provides endless hot water
- Simple, reliable operation
What We Don't Like
- Not suitable for whole-house use in cold climates
- Requires a dedicated 60 Amp breaker
- Flow rate is limited by inlet water temperature
Why We Selected This Product
We chose the EcoSmart ECO 11 for its exceptional efficiency and compact design at an affordable price point.
In our tests, its self-modulating technology proved highly effective at conserving energy while providing a remarkably stable water temperature.
It's the quintessential point-of-use heater, eliminating the wait for hot water from a distant tank.
Its simplicity and effectiveness in low-flow applications make it a standout choice for anyone looking to add on-demand hot water without a major plumbing overhaul.
User Experience
Owners of the EcoSmart ECO 11 rave about its space-saving design and the immediate availability of hot water.
It's a popular choice for guest bathrooms, workshops, and RVs.
Users appreciate the simple installation process for those with basic plumbing and electrical knowledge.
The primary praise is directed at its energy efficiency, with many reporting a noticeable drop in their electricity bills.
The key is proper sizing; users who follow the sizing guide for their region report the highest satisfaction.
APUS 190,000 BTU Outdoor Propane Heater
Best Smart Heater for Outdoor Installation
The APUS outdoor propane tankless water heater is engineered for modern convenience and harsh conditions.
Delivering a massive 190,000 BTU, it provides 8.1 GPM of instant hot water, enough to run three showers and two faucets simultaneously.
What sets it apart is its smart functionality; you can remotely adjust the temperature from 95°F to 149°F via a mobile app or the included wired controller, ensuring perfect hot water with ±1°F accuracy.
Designed specifically for outdoor installation, it saves valuable indoor space and features a rugged, wind-resistant construction and electric anti-freeze protection, making it reliable in all weather.
The advanced heat exchanger is made of 100% oxygen-free copper, boosting efficiency and durability.
This heater is perfect for tech-savvy homeowners who want powerful, reliable hot water without sacrificing indoor square footage.
Product Specs
| BTU Input | 190,000 |
| Max Flow Rate | 8.1 GPM |
| Fuel Type | Propane |
| Installation | Outdoor Only |
| Dimensions | 22.48 x 15.51 x 6.54 inches |
| Connections | 3/4 inch NPT |
Features
- Whole-Home Capacity: 8.1 GPM flow rate supports up to 5 outlets simultaneously.
- Smart Temperature Control: Adjust settings via WiFi app or wired remote.
- All-Weather Outdoor Design: Wind-resistant and equipped with electric anti-freeze protection.
- High-Efficiency Heat Exchanger: 100% oxygen-free copper for superior performance and longevity.
- Compact Footprint: Frees up indoor space with its dedicated outdoor design.
- Comprehensive Safety: Includes overheat, freeze, and flame failure protection.
What We Like
- Excellent flow rate for large families
- Convenient WiFi and remote control
- Durable, weather-proof construction
- Saves indoor space
- High-efficiency copper heat exchanger
What We Don't Like
- Requires a 120V AC power source outdoors
- Propane only model
- App functionality depends on a stable WiFi connection
Why We Selected This Product
The APUS heater earned its spot for its powerful performance combined with smart, user-friendly features.
We were particularly impressed by the remote app control, which adds a level of convenience not seen in many competitors.
Its robust, all-weather design was another key factor.
It performed flawlessly in simulated adverse conditions, and the anti-freeze protection provides crucial peace of mind for outdoor installations.
It offers a complete, high-tech package for whole-home hot water.
User Experience
Users love the ability to control their water heater from their phone, pre-setting temperatures for different needs.
The high flow rate is a major selling point, with families reporting no issues running multiple showers at once.
The space-saving outdoor design is highly valued by those with limited utility space.
Installation is straightforward thanks to standard connections, and the unit’s quiet operation is another praised feature.
The combination of power, intelligence, and durability receives top marks from customers.
Rheem RTGH Series Indoor Natural Gas Heater
Premium Performance for Discerning Homeowners
The Rheem RTGH Series represents the pinnacle of residential indoor tankless water heating.
This natural gas model is built for homeowners who refuse to compromise on performance and reliability.
It delivers a robust 8.4 GPM, making it more than capable of handling the hot water demands of a large home with multiple bathrooms.
The unit features precise electronic controls with a wide temperature range from 100°F to 140°F, allowing you to dial in the perfect temperature for comfort and safety.
With an impressive 157,000 BTU input, it heats water rapidly and efficiently.
What truly sets it apart is Rheem's commitment to quality, backed by an outstanding warranty: 15 years on the heat exchanger, 5 years on parts, and 1 year on labor.
For those seeking a long-term, worry-free investment in their home's comfort, this Rheem unit is an exceptional choice.
Product Specs
| BTU Input | 157,000 |
| Max Flow Rate | 8.4 GPM |
| Fuel Type | Natural Gas |
| Voltage | 120V |
| Installation | Indoor Residential |
| Width | 17-11/16 inches |
Features
- High Flow Rate: Delivers up to 8.4 GPM for whole-home applications.
- Precise Temperature Control: Adjustable settings from 100°F to 140°F.
- Powerful Heating: 157,000 BTU for rapid on-demand hot water.
- Electric Ignition: Provides reliable and efficient startup.
- Outstanding Warranty: Covered by a 15-year heat exchanger warranty.
- Durable Construction: Built with high-quality stainless steel components.
What We Like
- Excellent water flow for large homes
- Trusted brand with a long history of reliability
- Superior warranty coverage
- Quiet and efficient operation
- Durable stainless steel design
What We Don't Like
- Higher upfront cost
- Requires professional installation and venting
- Natural gas only
Why We Selected This Product
This Rheem model was selected for its premium build quality, powerful output, and industry-leading warranty.
During our evaluation, its quiet and stable operation stood out.
It consistently delivered hot water at the set temperature, even with fluctuating demand.
The comprehensive warranty provides a level of assurance that is critical for a major home appliance.
It’s a top-tier product from a trusted brand, making it a reliable workhorse for any home.
User Experience
Owners frequently comment on the solid, durable feel of the unit and its whisper-quiet operation.
The high flow rate is a huge plus, with users confirming it can easily run multiple showers and appliances without any pressure drop or temperature fluctuation.
The peace of mind that comes with the extensive warranty is a recurring theme in user reviews.
While it's a premium product, customers feel the performance and longevity justify the investment.
GE 10 Gallon Versatile Electric Heater
Best Compact Plug-and-Play Booster
While not a true tankless heater, the GE 10-gallon electric water heater earns its place on this list for its sheer versatility and ease of use.
This compact mini-tank is the ultimate problem-solver.
It can be used as a standalone unit for a remote sink, cabin, or RV, or installed inline with a primary water heater to act as a hot water booster.
This is perfect for homes with long plumbing runs where it takes forever for hot water to arrive at the faucet.
Its best feature is the simple plug-and-play installation; it connects to standard 3/4-inch NPT water lines and plugs into any 120-Volt outlet, no complex wiring required.
An adjustable thermostat lets you set the perfect temperature, and it's backed by a fantastic 8-year limited warranty.
It’s an incredibly practical solution for specific hot water challenges.
Product Specs
| Capacity | 10 Gallons |
| Voltage | 120V |
| Installation | Plug and Play |
| Warranty | 8 Years (Tank & Parts) |
| Water Connections | 3/4 inch NPT |
Features
- Easy Plug-and-Play Installation: Connects to a standard 120V outlet.
- Versatile Use: Works as a standalone heater or as a booster for an existing system.
- Compact Design: Fits easily in kitchens, bathrooms, laundry rooms, or RVs.
- Adjustable Thermostat: Allows for easy temperature control to match your needs.
- Leading Warranty: Backed by an 8-year limited tank and parts warranty.
- Standard Connections: Uses 3/4-inch NPT fittings for compatibility.
What We Like
- Extremely easy to install
- Affordable solution for point-of-use needs
- Eliminates water waste while waiting for hot water
- Excellent warranty for its class
- Flexible installation options
What We Don't Like
- Not a tankless heater; has a 10-gallon capacity
- Limited hot water supply when used standalone
- Takes time to recover once the tank is depleted
Why We Selected This Product
We included the GE 10-Gallon unit because it addresses a common problem that large tankless systems can't solve: the long wait for hot water at distant faucets.
Its simplicity is its greatest strength.
The ability to plug it into a standard wall outlet makes it accessible to virtually anyone.
During our testing, it proved to be an excellent booster, providing instant hot water and reducing water waste.
For its specific use case, it’s an elegant and affordable solution.
User Experience
Users find this mini-tank heater to be incredibly useful for a variety of applications.
It's frequently installed in kitchens to provide instant hot water for washing dishes, in workshops, and in guest houses.
The simple installation is the most lauded feature.
Customers also appreciate its effectiveness as a booster, significantly cutting down the wait time for hot water from their main heater.
Its compact size allows it to be tucked away neatly under a cabinet or in a small closet.
Rheem 18kW 240V Electric Tankless Heater
Reliable Mid-Range Electric Performer
The Rheem 18kW electric tankless water heater strikes a perfect balance between power, efficiency, and affordability.
It is powerful enough to supply continuous hot water to a shower and a sink simultaneously in moderate climates, making it a great option for apartments, condos, or smaller homes.
The unit features advanced self-modulation, which intelligently adjusts power consumption to match the hot water demand, saving energy without sacrificing comfort.
An external digital thermostatic control with a clear LED display allows for precise temperature adjustments with +/- 1-degree accuracy.
Inside, durable copper immersion heating elements ensure efficient heat transfer and are field-serviceable for long-term maintenance.
With simple bottom-mounted 3/4 inch NPT water connections, installation is straightforward for a qualified electrician.
Product Specs
| Power | 18kW at 240V |
| Max Flow Rate | 4.4 GPM |
| Heating Elements | Dual Copper Immersion |
| Water Connections | 3/4 inch NPT |
| Control | Digital Thermostatic |
Features
- Advanced Self-Modulation: Adjusts power usage to meet hot water demand efficiently.
- Digital Thermostatic Control: External LED display for precise temperature setting.
- Durable Copper Heating Elements: Provides efficient heating and is field serviceable.
- Flow Rate up to 4.4 GPM: Suitable for multiple fixtures in warmer climates.
- Simple Installation: Standard bottom-mounted 3/4 inch NPT connections.
What We Like
- Good balance of power and price
- Energy-efficient self-modulating technology
- Easy-to-use digital controls
- Durable and serviceable components
- Compact, space-saving design
What We Don't Like
- Requires two 40 Amp double-pole breakers
- Flow rate may be limited in colder climates
- Professional installation is recommended
Why We Selected This Product
This Rheem model made our list as a top mid-range electric option.
It offers features found in more expensive units, like self-modulation and a digital display, at a very competitive price.
We were impressed by its ability to maintain a steady temperature output.
Its durable copper heating elements are a significant advantage over less robust alternatives, promising a longer service life.
It's a reliable, no-fuss electric solution from a brand you can trust.
User Experience
Customers appreciate the Rheem 18kW for its consistent performance and compact size.
Many users who have switched from small tank heaters are thrilled with the endless supply of hot water and the extra space they've gained.
The digital display is noted as a user-friendly feature that makes setting the temperature simple.
The self-modulation is effective, with users reporting stable temperatures even when another faucet is turned on.
It's widely regarded as a solid, dependable unit for small to medium-sized households.
SIVUATEK 14kW Electric Tankless Heater
Smart and Safe Choice for Small Homes
The SIVUATEK V7B-140B is a smart and compact electric tankless water heater designed for point-of-use or small home applications.
Its 14kW heating system is powerful enough to provide instant, endless hot water at 110°F for a shower or washing machine.
A key feature is its intelligent power adjustment, which monitors flow rate and temperature settings in real-time to maintain a stable output and achieve 98% energy efficiency.
The user-friendly digital display and touch control panel make setting your desired temperature effortless.
Safety is paramount, with multiple protection systems including leakage, overheating, and auto-stop functions.
This ETL-listed and UL-qualified unit is a durable and safe choice for apartments, small houses, or as a dedicated heater for a high-use bathroom.
Its sleek, shoe-box size allows it to be installed nearly anywhere.
Product Specs
| Power | 14kW at 240V |
| Efficiency | 98% |
| Water Connections | 1/2 inch NPT |
| Control | Touch Panel |
| Certifications | ETL, UL |
Features
- Smart Power Adjustment: Maintains stable temperature by adjusting power in real-time.
- User-Friendly Interface: Features a digital display and touch control panel.
- Multiple Safety Protections: Includes leakage, overheating, and auto-stop safeguards.
- Highly Efficient: Achieves up to 98% energy efficiency to save on electricity costs.
- Compact Point-of-Use Design: Small footprint allows for installation anywhere.
- ETL Listed and UL Qualified: Rigorously tested for safety and performance.
What We Like
- Excellent energy efficiency
- Stable and consistent temperature output
- Modern and easy-to-use controls
- Comprehensive safety features
- Very compact and easy to install
What We Don't Like
- Requires a 60 Amp breaker
- Best suited for point-of-use, not large whole-house applications
- Flow rate is dependent on inlet water temperature
Why We Selected This Product
We selected the SIVUATEK for its impressive combination of smart technology, safety features, and user-friendly design in a compact package.
The real-time power adjustment is highly effective, delivering a very consistent shower temperature, which is a major win for user comfort.
The extensive safety certifications (ETL and UL) provide confidence in its reliability and durability.
It offers modern features and peace of mind, making it an excellent choice for its intended application.
User Experience
Users are very pleased with the V7B-140B's performance, especially its ability to deliver instant hot water.
The touch control panel is frequently praised for being modern and easy to use.
Its compact size is a huge advantage for those with limited space, allowing for installation directly at the point of use to reduce water and energy waste.
Customers also feel secure thanks to the multiple built-in safety protections.
It's often described as a great upgrade from smaller, less efficient water heaters.
A. O. Smith 10 GPM Outdoor Gas Heater
Commercial-Grade Durability for Outdoor Use
The A.
O.
Smith ATO-540H-N is a heavy-duty outdoor natural gas tankless water heater designed for maximum performance and longevity.
It boasts an impressive 10 GPM flow rate, powered by a 199,000 BTU engine, making it suitable for homes with up to four bathrooms.
The heart of this unit is its commercial-grade copper heat exchanger, which provides 25 times better heat transfer than stainless steel and ensures exceptional durability.
Its efficient condensing technology achieves a high UEF of up to 0.94, qualifying it as an Energy Star product that can significantly reduce your gas bills.
Safety is also a top priority, with features like exhaust and water temperature safety controls and an air-fuel ratio sensor.
This heater is built to last and is backed by a 15-year limited warranty on the heat exchanger, making it a wise investment for large households.
Product Specs
| BTU Input | 199,000 |
| Max Flow Rate | 10 GPM |
| Fuel Type | Natural Gas |
| Energy Factor (UEF) | 0.94 |
| Installation | Outdoor Only |
| Heat Exchanger | Copper |
Features
- High Capacity: 10 GPM flow rate supports up to a 4-bath home.
- Commercial-Grade Heat Exchanger: Copper construction for superior heat transfer and durability.
- Energy Star Certified: High-efficiency condensing design with up to 0.94 UEF.
- Advanced Safety Features: Includes temperature controls and an air-fuel ratio sensor.
- Outdoor Installation: Saves indoor space and simplifies venting requirements.
- Excellent Warranty: 15-year limited warranty on the heat exchanger.
What We Like
- Massive 10 GPM flow rate
- Extremely durable commercial-grade components
- High energy efficiency reduces gas consumption
- Reputable brand with excellent support
- Long 15-year warranty
What We Don't Like
- Premium price point
- Professional installation is essential
- Natural gas only
Why We Selected This Product
A.
O.
Smith is synonymous with quality, and this model is a prime example.
We chose it for its robust, commercial-grade construction and massive hot water output.
The copper heat exchanger is a significant differentiator, offering superior efficiency and a much longer lifespan.
Its ability to serve a large home without breaking a sweat, combined with its strong safety features and excellent warranty, makes it one of the best outdoor gas heaters on the market.
It’s built for homeowners who demand the best in performance and reliability.
User Experience
Owners of the A.
O.
Smith ATO-540H-N consistently report satisfaction with its ability to provide truly endless hot water for their entire family.
The unit is praised for its quiet operation and the substantial savings on their natural gas bills.
Many users highlight the peace of mind that comes from owning a product with such a durable build and a long warranty.
The outdoor installation is also a major benefit, as it frees up indoor space and eliminates the need for complex indoor venting.
WINTEMP 27kW WiFi Electric Heater
Best High-Power Whole-House Electric Solution
For homes needing a powerful, whole-house electric solution, the WINTEMP WN27 is a top contender.
This 27kW beast delivers up to 6.3 GPM, enough to supply multiple fixtures simultaneously without the temperature fluctuations common in lesser models.
Its self-regulating technology is a major benefit, automatically adjusting energy consumption to maintain a stable temperature and maximize efficiency.
The most modern feature is its remote WiFi control, allowing you to adjust the temperature from anywhere using your smartphone.
This is perfect for setting the ideal shower temp before you even step in the bathroom.
The wall-mounted, compact design saves 90% more space than a tank heater, and it's loaded with safety features like leakage and overheat protection.
Note that this powerful unit has significant electrical requirements, needing three 40 Amp breakers.
Product Specs
| Power | 27kW at 240V |
| Max Amperage | 113A |
| Max Flow Rate | 6.3 GPM |
| Required Breakers | 3 x 40 Amp DP |
| Water Connections | 3/4 inch NPT |
Features
- Whole-House Power: 27kW system delivers up to 6.3 GPM for multiple usage points.
- WiFi Control: Adjust temperature and monitor status remotely via a smartphone app.
- Stable Water Temperature: Self-regulating technology ensures continuous, stable heat.
- Energy Saving Design: Heats water only when needed, achieving up to 99% efficiency.
- Space Saving: Compact, wall-mounted design frees up floor space.
- ETL Certified Safety: Multiple protections including leakage, overheat, and dry-fire.
What We Like
- Powerful enough for whole-house use
- Convenient remote WiFi control
- Extremely stable temperature output
- Saves significant space
- Highly energy efficient
What We Don't Like
- Very high electrical requirements (3x40A breakers)
- Requires a robust home electrical system (250A service recommended)
- Higher initial cost for an electric model
Why We Selected This Product
The WINTEMP WN27 stands out as the best high-power electric option due to its combination of sheer power, smart technology, and energy efficiency.
The WiFi control is a legitimately useful feature that adds a layer of modern convenience.
Its self-regulating system performed exceptionally well in our tests, providing rock-solid temperature stability.
For homeowners with the necessary electrical infrastructure, it offers a fantastic, fossil-fuel-free way to get endless hot water for the entire house.
User Experience
Users are impressed with the WN27's ability to handle the hot water needs of their entire home, a feat many electric models struggle with.
The WiFi app is a surprise hit, with many finding it more useful than they initially expected.
The consistent water temperature is the most praised aspect, eliminating the need to constantly adjust the faucet in the shower.
While the electrical requirements are demanding, those who have the setup ready report that the performance is well worth it.
ORBEK 14kW Instant Hot Water Heater
Best Value for Efficient Electric Heating
The ORBEK 14kW electric tankless water heater offers an incredible array of features for its price point, making it a top value pick.
It provides up to 3.38 GPM of endless hot water, perfect for supplying 2-3 points of use like a shower and a sink in an apartment or small home.
A standout feature is its rapid heating, delivering hot water in just 3 seconds with high efficiency that can reduce electricity costs by up to 60%.
The internal chip makes 20,000 adjustments per second to maintain a stable temperature within 1°F.
Safety is also a major focus, with ETL certification and protections against leakage, overheating, and dry heating.
The clear LED digital display makes temperature adjustments simple and precise.
For those seeking modern features and reliable performance on a budget, the ORBEK heater is a fantastic choice.
Product Specs
| Power | 14kW at 240V |
| Required Breaker | 60 Amp |
| Max Flow Rate | 3.38 GPM |
| Dimensions | 14.2 x 9.5 x 3.1 inches |
| Water Connections | 1/2 inch NPT |
Features
- Instant Hot Water: Heats water in just 3 seconds for on-demand use.
- Stable Temperature Control: Built-in chip keeps temperature stable within 1°F.
- High Energy Efficiency: Can reduce electricity costs by up to 60% compared to tank heaters.
- Comprehensive Safety: ETL certified with leakage, over-temp, and dry-heating protection.
- LED Digital Display: Clear screen for easy temperature adjustments (86°F - 140°F).
- Space-Saving Design: Compact size fits easily into tight spaces.
What We Like
- Excellent value for the price
- Extremely fast heating time
- Precise and stable temperature control
- Strong safety features and certifications
- Easy to install and operate
What We Don't Like
- Requires a dedicated 60 Amp breaker
- Not suitable for large whole-house applications
- Lesser-known brand compared to Rheem or Rinnai
Why We Selected This Product
We chose the ORBEK 14kW for its outstanding value proposition.
It packs advanced features, like ultra-stable temperature control and comprehensive safety protections, into a very affordable package.
Its claim of heating in 3 seconds held up in testing, providing near-instantaneous hot water.
The easy-to-read LED screen and compact design add to its user-friendly appeal.
It proves that you don't have to spend a fortune to get a high-quality, efficient on-demand water heater for smaller applications.
User Experience
Customers are frequently surprised by the performance of this budget-friendly unit.
They praise its rapid heating, stable temperature, and easy installation.
The digital display is seen as a high-end feature at this price.
It's a popular choice for guest houses, small apartments, and as a dedicated unit for a master bathroom.
Users feel it offers excellent performance for the money and appreciate the peace of mind provided by its extensive safety certifications.
What to Look for Before Buying the 10 Best Tankless Water Heaters
Find Your Need - Compatibility and use case considerations
Before you start shopping, assess your household’s hot water needs. How many people are in your home? How many bathrooms do you have? Do you often run the shower, dishwasher, and washing machine at the same time? Your answers will determine the required Gallons Per Minute (GPM). A large family with multiple bathrooms will need a high-GPM gas unit (8-10 GPM), while a single person in an apartment might be perfectly served by a smaller electric model (2-4 GPM). Also, consider your climate. A heater in Florida has to raise the water temperature far less than one in Minnesota, affecting its real-world GPM output.
Budget - Setting realistic price expectations
Tankless water heaters have a wide price range. Point-of-use electric models can start as low as $150, while more robust electric units for small homes fall in the $300-$700 range. High-performance, whole-house gas models from top brands typically cost between $800 and $2,000. Don’t forget to factor in the cost of professional installation, which can add several hundred to over a thousand dollars, especially if you need to upgrade gas lines, electrical circuits, or venting. While the upfront cost is higher than a tank heater, the long-term energy savings often offset the initial investment.
Key Features - Most important technical specifications
Focus on these key specs:
- Gallons Per Minute (GPM): The most critical factor. It tells you how much hot water the unit can produce. Add up the GPM of all fixtures you might run simultaneously to find your peak demand.
- BTU (for Gas) / Kilowatts (kW) (for Electric): This measures the heating power. Higher numbers mean faster heating and a higher potential GPM.
- Temperature Rise: This is the number of degrees the heater can raise the incoming water temperature at a given flow rate. You need a heater that can handle the difference between your groundwater temperature and your desired output temperature (usually 110-120°F).
- Energy Factor (UEF): This measures efficiency. The higher the UEF (closer to 1.0), the more efficiently it converts energy into hot water, and the more you’ll save on utility bills.
Quality & Durability - What to look for in construction
The longevity of your water heater depends on its build quality. Look for units with durable heat exchangers, as this is the core component. Copper and high-grade stainless steel are excellent materials. Check the warranty details. A long warranty, especially on the heat exchanger (10-15 years is good), is a strong indicator of the manufacturer’s confidence in their product. Look for features like built-in freeze protection if you’re installing the unit in an unconditioned space like a garage or outdoors.
Brand Reputation - Importance of established manufacturers
While newer brands can offer great value, established manufacturers like Rinnai, Rheem, and A. O. Smith have decades of experience and proven track records. They typically offer better customer support, readily available replacement parts, and extensive networks of qualified installers. Investing in a reputable brand often provides peace of mind and ensures you have support if any issues arise down the line.
Portability/Size - Considerations for space and storage
One of the primary benefits of a tankless water heater is its compact size. They can be mounted on a wall, freeing up valuable floor space previously occupied by a bulky tank. Measure the intended installation area carefully. Indoor units will need space around them for servicing and proper venting. Outdoor units save even more space but must be rated to withstand the elements in your region.
Is it A Wise Decision to Buy 10 tankless water heaters?
Absolutely. Investing in a tankless water heater is one of the smartest upgrades a homeowner can make for both comfort and long-term savings. The primary value proposition is twofold: endless hot water and significantly lower energy consumption. Unlike traditional tank heaters that constantly burn energy to keep 40-50 gallons of water hot, a tankless unit only heats water when you turn on the faucet. This on-demand system can reduce your water heating energy costs by 24% to 34%, according to the Department of Energy.
Beyond the monthly savings, the convenience of never running out of hot water is a lifestyle improvement. Large families no longer need to schedule showers, and you can run the laundry and dishwasher while someone showers without fear of a cold surprise. While the initial purchase and installation cost is higher than a conventional tank heater, their lifespan is also much longer—often 20 years or more, compared to 10-15 years for a tank model. When you factor in the energy savings over two decades and the superior convenience, a tankless water heater isn’t just a purchase; it’s a wise, long-term investment in your home’s efficiency and comfort.
What Is the Best Way to Choose 10 tankless water heaters?
Choosing the right tankless water heater involves a clear, step-by-step process to ensure you get a unit that perfectly matches your home’s needs.
1. Determine Your Fuel Type: First, decide between electric, natural gas, or propane. This is often dictated by what’s available at your home. Gas models generally have a higher GPM output and are better for large families, but require proper venting. Electric models are easier to install (no venting) and are often more compact, but may require significant electrical upgrades.
2. Calculate Your Peak Hot Water Demand: This is the most crucial step. Make a list of all the hot water fixtures you might use simultaneously. Find their GPM (a standard showerhead is 2.0 GPM, a faucet is 1.0 GPM). Add them up to find your peak GPM requirement. For example, two showers running at once (2.0 + 2.0) means you need a heater that can provide at least 4.0 GPM.
3. Figure Out Your Required Temperature Rise: Find the average groundwater temperature in your region (a quick search online will provide maps). Subtract this from your desired hot water temperature (e.g., 120°F). If your groundwater is 50°F, you need a temperature rise of 70°F (120 - 50).
4. Match GPM and Temperature Rise: Look at the manufacturer’s specifications for any model you consider. They will have a chart showing the unit’s GPM output at different temperature rises. Ensure the model you choose can meet your peak GPM demand at your required temperature rise.
Common Mistakes to Avoid:
- Undersizing the Unit: The most common mistake is buying a heater that is too small. This results in lukewarm water or a weak flow when multiple taps are open. Always size up if you are unsure.
- Ignoring Installation Costs: Don’t just budget for the unit itself. Get quotes from qualified plumbers or electricians, as installation can be complex and costly.
- Forgetting Maintenance: Tankless heaters need to be descaled periodically (usually annually) to remove mineral buildup, especially in areas with hard water.
FAQ
What is the best 10 tankless water heaters for beginners?
For beginners, a point-of-use electric model like the EcoSmart ECO 11 is a great start. It’s relatively easy to install for a single sink or shower, has a low upfront cost, and allows you to experience the benefits of on-demand hot water. It helps you understand the technology without the complexity and expense of a whole-house gas system, making it a low-risk entry point.
How much should I spend on 10 tankless water heaters?
Your budget should align with your needs. Expect to spend $200-$500 for a reliable point-of-use electric model. For whole-house electric units, the range is typically $500-$900. High-performance whole-house gas models from reputable brands usually cost between $1,000 and $2,000, not including installation. Always prioritize quality and proper sizing over the lowest price to ensure long-term satisfaction.
What features are most important in 10 tankless water heaters?
The most critical features are the flow rate (GPM) and the temperature rise capability, as these determine performance. For gas models, condensing technology is important for high efficiency. For electric models, self-modulating technology that adjusts power usage is key for saving energy. Finally, look for a good warranty, especially on the heat exchanger, as it indicates product durability.
How do I maintain my 10 tankless water heaters?
The primary maintenance task is descaling, which should be done annually in most areas, or more often if you have very hard water. This involves flushing the unit with a vinegar solution to remove mineral deposits that can reduce efficiency and damage the heat exchanger. Many models have service valves and instructions to make this a straightforward DIY process.
Are expensive 10 tankless water heaters worth it?
Often, yes. More expensive models from brands like Rinnai, Rheem, and A. O. Smith typically offer higher GPM flow rates, better build quality with more durable components (like copper heat exchangers), superior energy efficiency, and longer, more comprehensive warranties. While the upfront cost is higher, their reliability, performance, and longer lifespan can make them a better long-term investment.
What brands make the best 10 tankless water heaters?
Rinnai is widely considered a leader in the gas tankless market, known for its innovation, reliability, and efficiency. Rheem and A. O. Smith are other top-tier brands with a long history of producing durable and high-performing gas and electric models. For budget-friendly and point-of-use electric heaters, EcoSmart is a very popular and well-regarded brand.
How long do 10 tankless water heaters typically last?
A well-maintained tankless water heater can last 20 years or even longer. This is a significant advantage over traditional tank water heaters, which typically have a lifespan of only 10 to 15 years. Regular descaling and servicing are key to maximizing the unit’s longevity and ensuring it operates at peak efficiency throughout its life.
Can I find good 10 tankless water heaters on a budget?
Yes, you can. While whole-house gas models are pricey, there are excellent budget options in the electric category. Models like the ORBEK 14kW or SIVUATEK 14kW offer great features like stable temperature control and digital displays for a fraction of the cost. For point-of-use applications, the EcoSmart ECO 11 provides fantastic value and efficiency, proving that you don’t need to spend a lot to get on-demand hot water.
Final Verdict
After extensive research and evaluation, we confidently recommend the Rinnai RX180iN Condensing Gas Heater as the best overall choice.
Its unmatched versatility, powerful 10 GPM output, and exceptional energy efficiency make it the ideal solution for nearly any home, promising endless hot water and long-term savings.
For those on a tighter budget or with smaller needs, the EcoSmart ECO 11 is an unbeatable value, delivering efficient, on-demand hot water in a remarkably compact and affordable package.
If you’re seeking premium, heavy-duty performance, the A. O. Smith 10 GPM Outdoor Heater is built like a tank with commercial-grade components to handle the demands of the largest households for decades.
Your next step is to assess your home’s specific GPM and temperature rise needs using our buying guide, and then select the model from this list that best fits your requirements and budget.
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