If you’re searching for the best Energy Star tankless water heaters, you’ve come to the right place. These units provide efficient hot water on demand, helping you save space and reduce energy costs. With various options available, it’s essential to know what features to look for. In the following sections, you’ll discover top models that stand out for their performance and efficiency, ensuring you make an informed choice for your home.
Rinnai RX199iN Tankless Water Heater
If you’re looking for a tankless water heater that combines efficiency and versatility, the Rinnai RX199iN is a top contender. This condensing model operates on natural gas or propane, delivering up to 11.1 GPM, perfect for handling multiple fixtures at once. With a UEF of .98, its energy efficiency is impressive, plus the Quick Flush feature simplifies maintenance. For installation, it’s best to hire a professional, so check the Find a Rinnai PRO page. Plus, the Smart Sense gas control system and optional WiFi control add modern convenience. Access guides and warranty info to maximize your usage.
Best For: The Rinnai RX199iN is best for homeowners seeking an efficient and reliable tankless water heater for both residential and commercial use.
Pros:
- High energy efficiency with a UEF of .98, helping to reduce energy costs.
- Capable of delivering up to 11.1 GPM, allowing for simultaneous use of multiple fixtures.
- Smart technology features, including a Smart Sense gas control system and optional WiFi control for added convenience.
Cons:
- Professional installation is recommended, which may add to overall costs.
- The optional WiFi control module is not included and must be purchased separately.
- Initial price point may be higher than traditional tank water heaters.
Rheem 18kW 240V Tankless Electric Water Heater, Gray
The Rheem 18kW 240V Tankless Electric Water Heater is an excellent choice for homeowners seeking an energy-efficient solution to their hot water needs, thanks to its impressive 99.8% efficiency rating. With a flow rate of up to 4.4 GPM, you’ll enjoy a steady supply of hot water. Its self-modulation technology adjusts power usage to save you up to 50% on water heating bills. Plus, this compact unit is 90% smaller than traditional tanks, making it easy to install almost anywhere. The external digital control provides precise temperature settings, ensuring you get hot water exactly when you need it.
Best For: Homeowners looking for an energy-efficient and space-saving hot water solution.
Pros:
- 99.8% efficiency rating helps reduce energy costs significantly.
- Compact design saves space, making installation versatile and convenient.
- Self-modulation technology adjusts power usage to meet demand, ensuring a steady hot water supply.
Cons:
- Requires a 240V electrical supply, which may necessitate electrical upgrades in some homes.
- Initial installation costs can be higher compared to traditional tank water heaters.
- Limited to a maximum temperature of 140°F, which may not meet all users’ preferences.
EcoSmart ECO 11 Electric Tankless Water Heater
For homeowners seeking an efficient and compact solution for hot water needs, the EcoSmart ECO 11 Electric Tankless Water Heater stands out with its patented self-modulating technology. Weighing just 6.5 pounds and measuring 11.5 x 8 x 3.75 inches, it’s 90% smaller than traditional tank heaters. You’ll enjoy endless hot water on demand, maintaining a consistent temperature within 1°F of your selected setting. With a maximum flow rate of 3.1 gallons per minute, it’s perfect for bathrooms and small sinks. Plus, it boasts a 99% thermal energy efficiency, heating water only when you need it.
Best For: Homeowners with limited space looking for an efficient and compact solution for on-demand hot water.
Pros:
- Endless hot water supply that ensures you never run out.
- Compact design is 90% smaller than traditional tank heaters, making it ideal for tight spaces.
- High energy efficiency with 99% thermal energy efficiency, saving on energy costs.
Cons:
- Limited flow rate of 3.1 gallons per minute may not be sufficient for larger households or multiple simultaneous uses.
- Requires a specific inlet water temperature of 67°F or above for optimal performance.
- Installation may require professional help due to electrical specifications and amperage draw.
AO Smith ATI-540H-N Condensing Residential/Light Commercial Tankless Heater
Looking for an energy-efficient solution to meet your hot water demands? The AO Smith ATI-540H-N Condensing Tankless Heater delivers with a flow rate of 10 GPM and an impressive Uniform Energy Factor of 0.95. Its compact, wall-mount design saves space, while the electric ignition eliminates the need for a pilot light. Plus, you can easily control the temperature with the built-in controller. Weighing 59 pounds and measuring 17.75W x 23.63H x 11.25D inches, it fits right in your home or light commercial space. With a 12-year warranty, it’s a reliable choice for efficient hot water solutions.
Best For: Homeowners and light commercial establishments seeking an energy-efficient, space-saving hot water solution.
Pros:
- Energy-efficient with a Uniform Energy Factor of 0.95, helping to lower utility bills.
- Compact design allows for wall-mount installation, saving space in smaller areas.
- Built-in temperature control for easy adjustments to hot water settings.
Cons:
- Moderate customer ratings (3.5 out of 5 stars) may indicate mixed user experiences.
- Limited warranty on parts (5 years) compared to some competitors.
- Weight of 59 pounds may require additional support for installation.
ORBEK 14kW Electric Tankless Water Heater
Experience the convenience of endless hot water with the ORBEK 14kW Electric Tankless Water Heater, designed for households needing reliable performance without the bulk of traditional tank systems. This compact unit measures just 9.5W x 14.2H x 3.1D inches and weighs only 13.04 pounds, making it a space-saving choice. With a flow rate of up to 3.38 GPM, it efficiently serves 2-3 points of use. Enjoy stable temperature control and energy savings of up to 60%. Plus, its advanced safety features and user-friendly LED display guarantee peace of mind while you enjoy hot water on demand.
Best For: Households seeking an efficient and compact solution for on-demand hot water without the space requirements of traditional tank heaters.
Pros:
- High energy efficiency, reducing electricity costs by up to 60% compared to conventional tank heaters.
- Provides endless hot water in just 3 seconds, perfect for multiple simultaneous uses.
- Advanced safety features including leakage protection and over-temperature protection for peace of mind.
Cons:
- Requires specific electrical installation (240V/60AMP two-pole breaker) which may necessitate professional help.
- Limited flow rate of up to 3.38 GPM may not be sufficient for larger households with high simultaneous hot water demands.
- Compact size may not accommodate all plumbing configurations without adjustments.
A. O. Smith Tankless Water Heater (ProLine® XE ATO-540H-N)
The A. O. Smith Tankless Water Heater (ProLine® XE ATO-540H-N) delivers on-demand hot water with an impressive flow rate of up to 10 GPM. With a powerful 199,000 BTU output, it’s designed for homes with 3 to 4 baths, ensuring you never run out of hot water. This Energy Star certified unit boasts a UEF of .94, making it an efficient choice. Its wall-mounted design allows flexible venting options, and it includes essential safety features like an overheat cut-off fuse. Plus, you’ll enjoy peace of mind with a 15-year warranty on the heat exchanger.
Best For: Families with 3 to 4 bathrooms who require a continuous supply of hot water.
Pros:
- Energy Star certified with a high Uniform Energy Factor (UEF) of .94, ensuring energy efficiency.
- Impressive flow rate of up to 10 GPM, providing ample hot water for multiple uses simultaneously.
- Long warranty period of 15 years on the heat exchanger, offering durability and peace of mind.
Cons:
- Professional installation is recommended, which may add to the initial cost.
- Limited maximum temperature of 122°F may not meet the needs of all users.
- Wall-mounted design may require additional space and specific installation considerations.
SIVUATEK 14kW Tankless Electric Water Heater
Ideal for homeowners seeking efficiency and convenience, the SIVUATEK 14kW Tankless Electric Water Heater delivers endless hot water on demand. With a compact design and a flow rate of 3.3 GPM, it’s perfect for multiple simultaneous uses like your kitchen and bathroom. This model operates at up to 99% thermal efficiency, cutting water heating costs by up to 60%. Plus, the intuitive LED display lets you control temperatures precisely. Safety features like leakage protection and auto shut-off guarantee reliability, while easy wall-mounted installation simplifies setup. Enjoy hot water without the hassle of standby energy loss!
Best For: Homeowners looking for an efficient, on-demand hot water solution that minimizes energy costs and maximizes convenience.
Pros:
- Energy Efficient: Operates with up to 99% thermal efficiency, reducing water heating costs by up to 60%.
- Compact Design: Space-saving dimensions allow for flexible installation options, including wall-mounted or under-sink setups.
- Instant Hot Water: Delivers endless hot water, perfect for multiple simultaneous usage points like kitchens and bathrooms.
Cons:
- Circuit Requirement: Requires a dedicated 60-amp circuit breaker, which may necessitate electrical upgrades in some homes.
- Limited Flow Rate: With a flow rate of 3.3 GPM, it may not be sufficient for larger households with high hot water demands.
- Installation Complexity: While installation is straightforward, it may still require professional assistance for electrical connections.
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
For homeowners seeking an energy-efficient solution to their hot water needs, the Rheem RTEX-24 24kW Electric Tankless Water Heater stands out with its impressive 99.8% efficiency rating. With a flow rate of 5.9 gallons per minute, it provides a continuous supply of hot water for your entire home. Its compact design, measuring just 17.63W x 18.25H x 3.5 inches, makes installation easy, and there’s no need for venting. You can adjust the temperature digitally in 1-degree increments, ensuring your comfort. Rated 4.3 out of 5 stars by customers, it’s a reliable choice for energy-conscious households.
Best For: Homeowners seeking an energy-efficient, space-saving solution for their hot water needs.
Pros:
- Provides a continuous supply of hot water with a flow rate of 5.9 GPM.
- Highly efficient with a 99.8% efficiency rating, reducing energy costs.
- Compact design allows for easy installation without the need for venting.
Cons:
- Requires a professional installation and specific electrical requirements (3 x 40 AMP breakers).
- May have reduced performance in colder climates due to ground water temperature impacts.
- Higher upfront cost compared to traditional water heaters.
Rinnai RU199iN Condensing Tankless Hot Water Heater
If you’re looking for a tankless water heater that delivers endless hot water and can efficiently serve multiple appliances at once, the Rinnai RU199iN Condensing Tankless Hot Water Heater is an excellent choice. With a remarkable 11 GPM flow rate, it guarantees powerful, consistent water pressure for up to seven appliances. Its compact, energy-efficient design heats water only when needed, earning ENERGY STAR certification. The unit features Circ-Logic technology for on-demand recirculation and can be paired with an external pump for quicker hot water access. Plus, it comes with a 15-year warranty on the heat exchanger for added peace of mind.
Best For: Homeowners seeking an energy-efficient, tankless water heater that can supply endless hot water for multiple appliances simultaneously.
Pros:
- Endless hot water supply for whole-home use with a maximum flow rate of 11 GPM.
- Compact design saves space and prevents accumulation of rusty sediments, extending the unit’s lifespan.
- Circ-Logic technology allows for on-demand recirculation, improving hot water access.
Cons:
- Professional installation recommended, which may incur additional costs.
- Wi-Fi monitoring module sold separately, increasing the overall investment.
- Weighty at 74.1 pounds, may require additional support during installation.
WINTEMP Electric Tankless Water Heater (27kW, 240V)
The WINTEMP Electric Tankless Water Heater (27kW, 240V) stands out as an excellent choice for homeowners seeking a reliable and efficient hot water solution. With a maximum output of 6.5 GPM, it guarantees you won’t run out of hot water during use. Its self-regulating technology maintains stable temperatures while saving up to 60% on electricity costs. The compact, wall-mounted design saves space, making it perfect for tight areas. Plus, it features multiple safety protections and comes with a 2-year warranty, providing peace of mind. Experience endless hot water on demand without the hassle of preheating!
Best For: Homeowners looking for an efficient, space-saving hot water solution that provides an endless supply of hot water on demand.
Pros:
- Maintains stable water temperatures with self-regulating technology, ensuring consistent hot water.
- Saves up to 60% on electricity costs compared to traditional tank heaters, enhancing energy efficiency.
- Compact wall-mounted design saves space, making it ideal for small areas.
Cons:
- Requires specific electrical requirements including 3 x 40 Amp breakers and 3 x 8/2 AWG wiring, which may incur additional installation costs.
- Higher upfront cost compared to traditional tank water heaters.
- May not be suitable for very large households with high simultaneous hot water demands beyond 6.5 GPM.
Factors to Consider When Choosing Energy Star Tankless Water Heaters
When you’re choosing an Energy Star tankless water heater, there are several key factors to keep in mind. You’ll want to take into account energy efficiency ratings, flow rate requirements, and installation needs. Additionally, think about space-saving designs and the heating technology options available to guarantee the best fit for your home.
Energy Efficiency Ratings
Choosing an Energy Star tankless water heater involves understanding energy efficiency ratings, as they directly impact your energy costs and overall performance. These ratings, based on the Uniform Energy Factor (UEF), reflect how effectively a unit converts energy into hot water. Higher UEF ratings, typically 0.90 or above for tankless models, signify better efficiency and lower operational costs. An Energy Star certified heater can save you about 20% more in energy expenses compared to standard models. For example, a unit with a 99% efficiency rating can drastically reduce your electricity or gas usage. By focusing on these ratings, you can make an informed choice that maximizes your savings while ensuring you have reliable hot water when you need it.
Flow Rate Requirements
Understanding energy efficiency ratings sets the stage for evaluating flow rate requirements in Energy Star tankless water heaters. The flow rate, measured in gallons per minute (GPM), dictates how many fixtures you can use simultaneously without sacrificing water temperature. For most households, a flow rate of 7-11 GPM will cover multiple showers and appliances at once. Keep in mind that warmer incoming water temperatures can enhance the effective flow rate, especially in warmer climates. Electric tankless water heaters usually offer lower flow rates, ranging from 3.1 to 5.9 GPM, making them ideal for smaller homes or point-of-use applications. Always calculate your peak usage GPM to ascertain your system meets your hot water needs efficiently.
Installation Considerations
Before diving into the installation of Energy Star tankless water heaters, you should consider several key factors to guarantee ideal performance and compliance with local codes. First, professional installation is highly recommended to make sure everything meets regulations and operates efficiently. Many models require specific electrical or gas connections, which might mean upgrading your existing wiring or gas lines. Adequate space for venting is vital, especially for gas units, as improper venting can create safety hazards. Additionally, placing the unit strategically can reduce the time it takes for hot water to reach your fixtures, minimizing waste. If you choose a model with advanced features like Wi-Fi control, be prepared for extra setup and integration with your home automation system.
Space-Saving Designs
When selecting an Energy Star tankless water heater, you’ll find that space-saving designs offer significant advantages, especially if you’re working with limited installation areas. Many of these heaters are up to 90% smaller than traditional models, allowing for versatile placement in tight spaces. Wall-mounted options free up valuable floor space, making them perfect for smaller homes or apartments. Their compact size not only cuts down on installation costs and time but also integrates easily into existing plumbing systems. Plus, these heaters provide an endless supply of hot water without needing a bulky storage tank. By heating water on demand, they minimize both physical and energy footprints, contributing to overall efficiency and savings.
Heating Technology Options
Choosing the right heating technology is essential for maximizing the efficiency and performance of your Energy Star tankless water heater. You’ll primarily decide between electric and gas models. Electric heaters often feature self-modulating technology, adjusting power based on your hot water needs. However, gas models typically offer higher flow rates, allowing you to use multiple fixtures simultaneously without losing performance. Consider energy efficiency, as many tankless systems achieve up to 99% thermal efficiency and hold Energy Star certification. Advanced features like smart technology and digital controls can enhance your experience, enabling precise temperature adjustments and energy monitoring. Be sure to assess your home’s needs carefully, as your choice will impact installation requirements and overall energy costs.
Maintenance and Durability
Maintaining your Energy Star tankless water heater is essential for maximizing its lifespan and efficiency. Regular maintenance, like flushing the system to remove scale buildup, can help extend its life, with many models featuring a Quick Flush option for easy upkeep. These units typically last between 15 to 20 years, greatly outpacing traditional tank heaters. Choosing models built with high-quality materials, such as copper heating elements and stainless steel heat exchangers, boosts durability and corrosion resistance. Don’t forget to schedule regular inspections and professional servicing to catch minor issues before they escalate. By prioritizing maintenance, you’ll guarantee your tankless water heater operates effectively and efficiently throughout its lifespan, providing hot water on demand when you need it.
Safety Features Included
Safety features are vital considerations for anyone looking to invest in an Energy Star tankless water heater. Many of these units include leakage protection to prevent water damage and over-temperature protection for safe operation. Advanced models offer dry-heating protection, guaranteeing the unit doesn’t operate without water, which enhances durability. Look for ETL certification, as it means the heater meets established safety standards and has undergone rigorous testing for reliability. Additionally, some tankless water heaters feature auto shut-off mechanisms that activate during overheating or malfunctions. Don’t forget that proper installation is imperative for safety; many manufacturers recommend hiring a professional to confirm all safety features are correctly implemented and fully functional. Prioritize safety to enjoy efficient hot water without worry.
