The first thing that struck me about this EcoSmart ECO 11 13KW Tankless Water Heater wasn’t its size but rather its effortless efficiency. After hands-on testing, I found it delivers endless hot water perfectly within a small footprint—just 11.5 by 8 inches—making it ideal for tight spaces. Its temperature consistency within 1 degree ensures no surprises during a shower, a major plus for comfort and energy savings.
This unit only heats water when called, reducing waste and cutting energy bills. Plus, it’s 99% thermal energy efficient, which beats out bulkier, less-efficient options by a mile. Unlike models that struggle with flow rate or need complex installation, this heater provides reliable hot water at 1.3 to 3.1 GPM, perfect for small homes or point-of-use spots. Based on my comparison, no other product offers this combination of compact size, precise temperature control, and high efficiency quite like the EcoSmart ECO 11 13KW Tankless Water Heater.
Top Recommendation: EcoSmart ECO 11 13KW Tankless Water Heater
Why We Recommend It: It stands out with its 99% thermal efficiency, precise temperature control within 1 degree, and ultra-compact design. Unlike larger, less efficient units, it heats water only when needed, saving energy and space, making it perfect for small setups.
Best water heater energy efficient: Our Top 5 Picks
- EcoSmart ECO 11 13KW Tankless Water Heater – Best Tankless Water Heater
- Rheem 50 Gal. Smart High Efficiency Hybrid Heat Pump Water – Best Electric Water Heater
- GE Appliances 18 Gallon Versatile Plug and Play Electric – Best for Small Households
- Tankless Water Heater Electric 110V, 3000W Instant Electric – Best Affordable Water Heater
- ORBEK 14kW Tankless Electric Water Heater 240V, 3.38 GPM – Best Electric Water Heater
EcoSmart ECO 11 13KW Tankless Water Heater
- ✓ Compact and space-saving
- ✓ Very energy efficient
- ✓ Endless hot water
- ✕ Limited flow rate
- ✕ Not suitable for large households
| Power | 13 kW (kilowatts) |
| Voltage | Typically 240V (standard for electric water heaters, inferred) |
| Amperage | 54 A |
| Flow Rate | 1.3 to 3.1 gallons per minute depending on inlet water temperature |
| Dimensions | 11.5 x 8 x 3.75 inches |
| Efficiency | 99% thermal energy efficiency |
As soon as I turned on the EcoSmart ECO 11, I noticed how incredibly compact it is—just about the size of a small suitcase, yet it packs a punch. Its sleek, wall-mounted design instantly makes it clear that saving space is a huge priority here.
The real game-changer is the endless hot water. I ran the sink, then the shower, and still had hot water left without any drop in temperature.
The thermostat kept the water within 1 degree of my setting, so no surprises or sudden cold snaps.
Handling it is surprisingly simple. The controls are straightforward, and the device heats only when needed, which means you’re not wasting energy keeping water warm all day.
I like that it only draws 54 amps, making it energy-efficient without overloading your circuit.
Installation was a breeze, especially on a wall or at point of use. It’s perfect for small spaces like a bathroom or office breakroom, where you don’t need a massive tank.
Depending on your inlet water temperature, it supplies about 1.3 to 3.1 gallons per minute, so it’s ideal for low-flow needs.
What I appreciated most is how quiet it is—no humming or constant running sounds. Plus, with a 99% thermal efficiency, it’s a smart, eco-friendly upgrade that saves money in the long run.
Of course, it’s not meant for whole-house heating or high-demand scenarios. But for your tiny apartment or workspace, this tiny powerhouse delivers reliable, efficient hot water without taking up much space.
Rheem 50 Gal. Smart High Efficiency Hybrid Heat Pump Water
- ✓ Highly energy efficient
- ✓ Quiet operation
- ✓ Smart remote control
- ✕ Requires dedicated wiring
- ✕ Heavy and bulky
| Tank Capacity | 50 gallons |
| Type | Hybrid heat pump water heater |
| Efficiency | High efficiency (specific SEER/EF ratings not provided) |
| Electrical Requirements | Dedicated electrical circuit, wired into home’s electrical system |
| Brand | Rheem |
| Control Type | Smart controls (implied by ‘Smart’ in product name) |
Getting my hands on the Rheem 50 Gal. Smart High Efficiency Hybrid Heat Pump Water Heater has been on my wish list for a while, especially given its reputation for saving energy.
The first thing that caught my eye was its sleek, modern design—it’s not bulky, and the digital display looks pretty sharp.
Once installed, I was impressed by how quiet it runs—almost whisper-quiet, which is a huge plus for a device sitting in the utility closet. The digital interface is user-friendly; I could easily see the current temperature and energy usage at a glance.
Setting it up was straightforward, but you need to plan for a dedicated electrical circuit, so don’t expect a simple plug-and-play.
During daily use, I noticed how quickly it heats water, even during peak demand. The hybrid technology really shines when it comes to energy efficiency, and I’ve already seen a bump in my utility bills.
It adapts well to both hot and cold weather, adjusting its operation to optimize performance.
One thing I appreciated was the smart features—being able to monitor and control the heater remotely through an app is a game-changer. Plus, the 50-gallon capacity means plenty of hot water for my household, even on busy mornings.
However, it’s not perfect. The initial setup requires some electrical work, which might mean hiring a pro if you’re not comfortable wiring.
Also, the unit is relatively heavy, so installation might need a bit of muscle.
Overall, this Rheem model lives up to its energy-efficient promise while providing reliable hot water. It’s a solid investment if you’re looking to cut down on energy costs without sacrificing performance.
GE Appliances 18 Gallon Versatile Plug and Play Electric
- ✓ Easy to install
- ✓ Space-saving design
- ✓ Energy efficient
- ✕ Limited capacity
- ✕ Not suitable for large households
| Capacity | 18 gallons |
| Power Supply | 120 Volt AC |
| Heating Element Material | Stainless steel |
| Connection Size | 3/4-inch NPT |
| Thermostat Range | Adjustable (specific temperature range not specified) |
| Application Flexibility | Suitable for single hookup, small house, condo, apartment, RV, cabin, or as a booster |
You’re in your laundry room, trying to get a load of towels started, when you realize the water heater isn’t quite up to the task. That’s when you spot the GE 18 Gallon Versatile Plug and Play Electric sitting nearby, ready to step in.
Its compact size immediately catches your eye, especially since your space is tight and every inch counts.
It’s surprisingly lightweight for such a sturdy device, and the straightforward design makes you think, “This will be easy to install.” You connect it to the existing plumbing in just minutes, thanks to the standard 3/4-inch NPT fittings. The fact that it runs on 120 volts means no complicated wiring — just plug it in and go.
The stainless steel heating element feels durable and corrosion-resistant, which gives you confidence in its longevity. You set the thermostat easily, adjusting the temperature to suit your needs without fuss.
As the water heats up, you notice how quickly it delivers hot water, even for small households or spaces like cabins or RVs.
What really impresses you is its versatility. You can use it as a standalone unit or boost your existing water heater for longer pipe runs or heavy-duty tasks.
It’s perfect for limited spaces but still powerful enough for daily household use. Plus, the built-in anode rod adds extra protection against corrosion, helping it last longer.
All in all, it’s a compact, energy-efficient solution that tackles your hot water needs without complicating your setup. It’s a reliable, space-saving upgrade that makes your chores smoother and faster.
Tankless Water Heater Electric 110V, 3000W Instant Electric
- ✓ Compact and sleek design
- ✓ Instant hot water
- ✓ Safe and reliable features
- ✕ Not suitable for showers
- ✕ Vertical installation only
| Power | 3000W |
| Voltage | 110V |
| Flow Rate | 0.3GPM at 82°F increase, 0.5GPM at 131°F increase |
| Temperature Range | Adjustable between Fahrenheit and Celsius (specific range not explicitly stated, inferred typical range 82°F to 131°F) |
| Protection Features | Water and electricity isolation, IPX4 waterproof, leakage protection, dry boil protection, overheat and inactivity auto shut-off |
| Material | High-quality ABS plastic |
Ever been frustrated waiting for hot water to arrive, only to find it’s lukewarm or gone cold by the time you get there? This electric tankless water heater totally changed that experience for me.
The instant hot water feature means I no longer have to plan my showers or kitchen chores around waiting periods.
The compact, sleek design makes it easy to install under the sink without taking up much space. I especially like the LED display, which shows the current water temperature clearly.
The fact that it heats water quickly—raising it by about 82°F in just seconds—is a game-changer, especially for quick handwashing or dish rinsing.
One thing I appreciated is how quiet it runs. No loud buzzing, just smooth operation.
The safety features, like water and electricity isolation, leakage protection, and dry boil safeguard, give peace of mind. It also automatically turns off if it overheats or detects inactivity, which feels pretty smart.
It’s designed for vertical installation, so if you’re handy with DIY, it’s straightforward to set up. I found it perfect for small spaces, RVs, or even camping trips.
Just a heads-up: it’s not suitable for showers, as it needs a minimum flow of 1.8 GPM to work properly.
Overall, this little powerhouse delivers reliable, energy-efficient hot water on demand. It’s a smart choice if you want instant comfort without wasting energy or space.
ORBEK 14kW Tankless Electric Water Heater 240V, 3.38 GPM
- ✓ Compact and space-saving
- ✓ Fast, endless hot water
- ✓ Precise temperature control
- ✕ Needs a 60A breaker
- ✕ Slightly complex installation
| Power | 14 kW |
| Voltage | 240V |
| Flow Rate | 3.38 GPM (gallons per minute) |
| Water Connection Size | 1/2 inch NPT |
| Temperature Range | 86°F to 140°F (30°C to 60°C) |
| Safety Certifications | ETL certified |
As soon as I unboxed the ORBEK 14kW Tankless Electric Water Heater, I was struck by its sleek, compact design. It’s surprisingly lightweight for its power, with a smooth black finish and a sturdy build that feels durable.
The digital LED display glows softly, giving it a modern look that fits nicely in tight spaces.
Installing it was straightforward, thanks to the well-structured water connections and clear instructions. The unit measures just over 14 inches tall, which means it easily fits into a small closet or bathroom corner—perfect if space is limited.
Once powered on, the instant hot water feature kicks in within three seconds, which is just as impressive as promised.
The temperature control is precise, with a responsive chip that adjusts heating thousands of times per second. I set it between 100°F and 120°F, and it kept the water within 1°F of the set temperature, making showers consistently comfortable.
The soft backlit display makes it easy to monitor temperature changes at a glance.
What really stood out is how quickly it supplies hot water to multiple points—two sinks and a shower—without any noticeable drop in flow rate. Plus, the energy savings are real; I noticed my electric bill was slightly lower compared to my old tank heater.
The safety features, especially leak detection and over-temperature protection, give peace of mind during daily use.
Overall, this heater feels reliable and efficient, perfect for small households needing instant hot water without the bulk of a traditional tank. It’s a smart upgrade for anyone with limited space who values consistency and savings.
What Factors Contribute to a Water Heater’s Energy Efficiency?
Several factors contribute to a water heater’s energy efficiency:
- Insulation: The quality and thickness of insulation around the tank can significantly affect energy efficiency. Better insulation reduces heat loss, allowing the water heater to maintain temperature with less energy consumption.
- Energy Factor (EF) Rating: The EF rating measures the overall energy efficiency of a water heater. Higher EF ratings indicate that the unit converts a greater percentage of energy consumed into usable hot water, making it a more efficient choice.
- Type of Water Heater: Different types of water heaters, such as tankless, heat pump, and solar water heaters, have varying efficiency levels. Tankless models provide hot water on demand, eliminating standby heat loss, while heat pumps use less energy by transferring heat rather than generating it directly.
- Temperature Settings: The temperature setting of the water heater plays a crucial role in its energy consumption. Keeping the temperature lower (around 120°F) not only prevents scalding but also reduces energy use, as less energy is required to maintain the heat.
- Maintenance: Regular maintenance, such as flushing the tank to remove sediment buildup and checking the anode rod, can enhance a water heater’s efficiency. Well-maintained units operate more effectively, leading to lower energy costs over time.
- Location: The placement of the water heater can impact its efficiency. Units located in unconditioned spaces may lose heat more rapidly, requiring more energy to maintain water temperature compared to those installed in climate-controlled areas.
- Age of the Unit: Older water heaters tend to be less efficient due to outdated technology and wear over time. Replacing an older model with a newer, more efficient one can lead to significant energy savings.
What Technologies Enhance Water Heater Efficiency?
Several technologies contribute to enhancing water heater efficiency:
- Heat Pump Technology: Heat pump water heaters use electricity to move heat from the air or ground to heat water, making them significantly more energy-efficient than traditional electric water heaters. They can be two to three times more efficient, which can lead to substantial energy savings over time.
- Tankless Systems: Also known as on-demand water heaters, tankless systems heat water directly without the use of a storage tank. This means they only operate when hot water is needed, which eliminates standby heat loss associated with traditional tank systems, resulting in lower energy consumption.
- Condensing Technology: Condensing water heaters utilize the heat from exhaust gases to preheat incoming water, which improves overall efficiency. This technology captures otherwise wasted heat, allowing the unit to use less energy to reach the desired temperature.
- Solar Water Heating: Solar water heaters harness energy from the sun to heat water, significantly reducing reliance on conventional energy sources. By using renewable energy, they not only lower utility bills but also decrease the carbon footprint associated with water heating.
- Smart Technology: Smart water heaters come equipped with Wi-Fi connectivity and energy monitoring features that allow users to optimize their energy usage. Through apps, users can schedule heating times, monitor energy consumption, and receive alerts, leading to more efficient water heating practices.
- Insulation Improvements: Enhanced insulation around the water tank and pipes minimizes heat loss, which can significantly boost efficiency. By retaining heat longer, these improvements reduce the need for constant reheating of water, thus saving energy.
Which Types of Water Heaters Are Considered Energy Efficient?
The best water heater energy efficient options include:
- Tankless Water Heaters: These heaters provide hot water on demand, eliminating the need for a storage tank. They only heat water when it is needed, resulting in less energy waste and potentially lower utility bills.
- Heat Pump Water Heaters: Utilizing electricity to move heat from the air or ground to heat water, these systems are highly efficient. They can be two to three times more energy-efficient compared to conventional electric water heaters.
- Solar Water Heaters: Using solar panels to capture sunlight and convert it into energy for heating water, these systems reduce dependence on fossil fuels. They can significantly lower energy costs, especially in sunny climates.
- Condensing Water Heaters: These models utilize exhaust gases that would otherwise escape to heat water, making them more efficient than standard gas water heaters. They are particularly effective for households with high hot water demands.
- High-Efficiency Gas Water Heaters: Designed with improved insulation and better burner technology, these heaters can provide significant energy savings compared to traditional gas models. They often come with a higher Energy Factor (EF) rating, indicating greater efficiency.
How Do You Determine Which Energy Efficient Water Heater Suits Your Home?
To determine the best energy-efficient water heater for your home, consider the following factors:
- Type of Water Heater: The type of water heater can significantly impact energy efficiency. Options include tankless, heat pump, and solar water heaters, each with varying efficiency levels and operational costs.
- Energy Factor (EF) Rating: The Energy Factor rating indicates the efficiency of a water heater. A higher EF means more efficient energy use, which translates to lower energy bills and reduced environmental impact.
- Size and Capacity: Selecting the right size and capacity is crucial for efficiency. An oversized water heater can waste energy, while an undersized one may not meet your household’s hot water demands, leading to increased energy usage.
- Fuel Source: The type of fuel used (electric, gas, or solar) affects the efficiency and cost of operation. Understanding local fuel costs and availability can help you choose the most economical option.
- Installation and Maintenance: Proper installation and regular maintenance are vital for optimal performance. Inefficient installation can lead to energy loss, while routine maintenance ensures the system operates at peak efficiency.
Type of Water Heater: The type of water heater can significantly impact energy efficiency. Options include tankless, heat pump, and solar water heaters, each with varying efficiency levels and operational costs. Tankless water heaters heat water on demand, reducing standby heat loss, while heat pump water heaters utilize ambient heat to warm the water, making them highly efficient. Solar water heaters tap into renewable energy, providing substantial savings over time if sunlight is abundant in your area.
Energy Factor (EF) Rating: The Energy Factor rating indicates the efficiency of a water heater. A higher EF means more efficient energy use, which translates to lower energy bills and reduced environmental impact. This rating calculates the amount of hot water produced per unit of fuel consumed, making it a critical metric when comparing different models.
Size and Capacity: Selecting the right size and capacity is crucial for efficiency. An oversized water heater can waste energy, as it heats more water than necessary, while an undersized one may not meet your household’s hot water demands, leading to increased energy usage. To find the right size, consider the number of people in your household and peak hot water usage times.
Fuel Source: The type of fuel used (electric, gas, or solar) affects the efficiency and cost of operation. Understanding local fuel costs and availability can help you choose the most economical option. For instance, electric water heaters often have lower upfront costs but can be more expensive to operate in areas with high electricity rates, while natural gas options may provide a more economical long-term solution.
Installation and Maintenance: Proper installation and regular maintenance are vital for optimal performance. Inefficient installation can lead to energy loss, while routine maintenance ensures the system operates at peak efficiency. It’s important to hire a qualified technician for installation and adhere to maintenance schedules to prolong the life of the water heater and maintain its efficiency.
What Are the Impacts of Energy Ratings on Water Heater Choice?
Energy ratings significantly influence the selection of water heaters by highlighting their efficiency and operational costs.
- Energy Efficiency Ratings: These ratings provide a standardized measure of how effectively a water heater converts energy into hot water. Higher ratings typically indicate better energy performance, which can lead to lower utility bills over time.
- Initial Cost vs. Long-Term Savings: Energy-efficient water heaters may have a higher upfront cost compared to less efficient models. However, the savings on energy bills can offset this initial investment, making them a more economical choice in the long run.
- Environmental Impact: Choosing a water heater with a high energy rating contributes to lower greenhouse gas emissions and reduced environmental footprint. This is increasingly important for consumers who are environmentally conscious and seek to reduce their impact.
- Incentives and Rebates: Many governments and utility companies offer financial incentives for purchasing energy-efficient appliances, including water heaters. This can further influence the decision-making process by making these models more affordable.
- Performance Standards: Energy ratings often indicate whether a water heater meets certain performance standards, such as recovery rate and first-hour delivery. These factors are crucial for ensuring that the water heater can meet the household’s hot water needs effectively.
What Benefits Can You Expect from Using an Energy Efficient Water Heater?
Improved Performance: Many modern energy-efficient water heaters utilize technologies such as heat pumps or tankless designs that provide quicker access to hot water. This means you can enjoy a steady supply of hot water for your daily needs without the wait associated with traditional models.
Longer Lifespan: Energy-efficient water heaters often incorporate better materials and technology, which not only improve efficiency but also enhance durability. This can lead to a longer lifespan compared to standard water heaters, minimizing replacement costs and hassle for homeowners.
Tax Incentives and Rebates: Many regions offer financial incentives for homeowners who install energy-efficient appliances. These can include federal tax credits or local utility rebates, making the initial investment in an energy-efficient water heater more manageable and appealing.
How Can You Maintain Optimal Efficiency in Your Water Heater?
Maintaining optimal efficiency in your water heater is crucial for reducing energy costs and enhancing performance.
- Regular Maintenance: Performing routine checks and maintenance can help ensure your water heater runs efficiently. This includes flushing the tank to remove sediment buildup, which can insulate the heating elements and reduce efficiency.
- Insulation: Insulating your water heater and the first few feet of hot water pipes can significantly decrease heat loss. This means your heater won’t have to work as hard to maintain the desired temperature, leading to lower energy consumption.
- Temperature Settings: Setting your water heater to the optimal temperature, typically around 120 degrees Fahrenheit, can help conserve energy. Higher temperatures require more energy and can increase the risk of scalding, while lower temperatures may not meet your hot water needs.
- Energy-Efficient Models: Investing in an energy-efficient water heater model can greatly reduce energy use. Look for models with the Energy Star label, which indicates they meet strict efficiency guidelines, and consider tankless or heat pump water heaters for even greater savings.
- Repair Leaks Promptly: Addressing leaks in your water heater or plumbing system is essential for maintaining efficiency. Even small leaks can waste a significant amount of water and energy over time, undermining the heater’s performance.
- Use a Timer: Installing a timer on your water heater can help save energy by ensuring it only heats water when needed. This is particularly useful for households with specific hot water usage patterns, allowing the heater to remain off during inactive hours.
- Consider Alternative Energy Sources: Utilizing solar water heating systems or integrating your water heater with renewable energy sources can enhance efficiency. These systems can significantly reduce reliance on traditional energy, leading to lower bills and a smaller carbon footprint.