10 Best Tankless Water Heaters 2024 | Find Yours Now!

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Getting hot water when you need it sounds simple, right? But sometimes, waiting for the water to heat up feels like forever. And if more than one person needs a shower back-to-back, forget about it! This common problem leads many people to think about tankless water heaters.

They provide hot water on demand and can save space and energy.

One cool fact: The Stiebel Eltron Tempra 36 Plus Electric Tankless Water Heater is rated the top pick for 2024!

This article will show you the ten best tankless water heaters for 2024. We’ve got options for every home and budget so that you can find your perfect match. From cutting down wait times to saving energy, we’ll help make those cold showers a thing of the past.

Ready to warm up to some great options? Keep reading!

Top 10 Tankless Water Heaters for 2024

Quick Recommendation

For a quick recommendation, look at this product list or scroll down for more detailed reviews.

1. Rinnai RE140iN Non-Condensing Natural Gas Tankless Water Heater

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Endless Hot Water in a Compact Design for 5 Fixtures

The Rinnai RE140iN Non-Condensing Natural Gas Tankless Water Heater stands out in its category, making it our top pick for your hot water needs. This innovative model from Rinnai delivers up to 5.3 gallons per minute (GPM), ensuring that you won’t run out of hot water even with multiple fixtures in use. Its compact size, resembling a small suitcase, allows for easy installation in various spaces. The design is smart and energy-efficient; it heats water only when necessary, which can lower your utility bills.

One notable feature is the unit’s user-friendly LED display that simplifies setting reminders and understanding error codes. For added convenience and future upgrade options, this heater can be paired with a Rinnai Controlr module for WiFi connectivity (sold separately). You can adjust temperature right from your smartphone. Plus, the durability of the RE140iN is backed by a great warranty covering the heat exchanger for 15 years.

Choosing this tankless water heater means enjoying endless hot water while reducing energy consumption. Its thoughtful design focuses on ease of use and efficiency, and it is perfect for users looking for trouble-free operation and maintenance. Whether upgrading your current system or installing a new one, the Rinnai RE140iN offers reliability and performance that justifies its position as our number one selection.

Features

• Up to 5.3 GPM for Multiple Uses: Enjoy endless hot water with Rinnai’s tankless water heater, which supports up to five fixtures at once. It is perfect for families needing simultaneous showers, dishwashing, or laundry without the wait.
• Fits Almost Anywhere: This natural gas water heater’s compact design is as small as a suitcase, making it easy to fit in various spaces around your home.
• Energy Efficient Heating: Only heats water when you need it, saving on energy bills. This smart feature conserves energy by avoiding unnecessary heating and provides hot water on demand.
• Long-Term Reliability: Comes with great warranties — 15 years for the heat exchanger, 5 years for labor, and 1 year for parts. Rest easy knowing your investment is protected.
• Easy Control with WiFi Module (Optional): Although not included, the optional Controlr module allows you to manage your hot water needs via WiFi. You can also get reminders and error codes directly through the LED screen.

Pros

• Saves space: Small like a suitcase and fits many areas.
• Endless hot water: Supplies up to 5.3 GPM, serving 5 fixtures at once.
• Energy efficient: Only heats when needed, saving on energy bills.
• Easy upkeep: LED screen shows service reminders and error codes.

Cons

• Requires professional installation, which adds extra cost.
• The WiFi control module is not included; you must buy it separately.
• Not recommended for areas with very cold groundwater temperatures.

The Rinnai RE140iN Non-Condensing Natural Gas Tankless Water Heater is perfect for homeowners seeking a smart, space-saving solution that guarantees endless hot water for up to 5 fixtures at once. If you’re ready to upgrade your home with one of the top 10 tankless water heaters of 2024, find a professional installer and make the switch today.

Specifications

Brand	‎Rinnai
Product Dimensions	‎14.05″W x 27.28″H
Display	‎LED Display
Color	‎Silver
Wattage	‎140000 watts
Style	‎RE140iN Natural Gas
Manufacturer	‎Rinnai
Item Weight	‎50.6 pounds
Item model number	‎REU-VE1720FFD-US-N
Size	‎5.3 GPM

2. EcoSmart ECO 11 Electric Tankless Water Heater

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Save Space and Energy with Top Tankless Heater Choice

The EcoSmart ECO 11 Electric Tankless Water Heater stands out for its smart, energy-saving design. It heats water on demand, meaning it only uses power when you need hot water. This feature helps reduce electricity bills, so we rank it No. 2. With its self-modulating technology, it adjusts energy output to match the amount of hot water needed, ensuring efficient use of power.

Perfect for smaller spaces like bathrooms or office breakrooms, the EcoSmart ECO 11 doesn’t waste space or resources. Its compact size allows for easy installation almost anywhere you need immediate hot water access. Plus, with the capability to deliver between 1.3 and 3.1 gallons per minute depending on incoming water temperature, this heater promises consistent performance and endless hot water supply within one degree of your desired setting.

Choosing the EcoSmart ECO 11 means investing in a reliable, cost-effective solution for heating your water without sacrificing quality or efficiency.

Features

• Instant Hot Water Anytime: Never wait for hot water again! The EcoSmart ECO 11 Electric Tankless Water Heater gives you endless on-demand hot water whenever needed. Enjoy consistent and continuous hot water at your command, whether you’re taking a shower, washing dishes, or running the laundry.
• Save More Energy: Be smart about your energy use with patented Self Modulating Technology. This feature ensures that the heater only uses energy when heating water—not while idle—leading to an incredible 99% thermal energy efficiency rate. You’ll see the difference in your electricity bills!
• Compact and Convenient: Say goodbye to bulky tanks! The EcoSmart ECO 11 is designed to save space, being 90% smaller than traditional heaters. Install it easily on any wall or directly at the point of use, such as under sinks or in closets, for immediate access to hot water without the clutter.
• Perfect Fit for Smaller Needs: This is ideal for a bathroom, a small sink, an office breakroom, or other point-of-use locations where space and demand are limited. It efficiently provides between 1.3 and 3.1 gallons per minute depending on inlet temperature, ensuring you have enough hot water.
• Steady Temperature Control: Enjoy peace of mind knowing that your shower or sink will dispense water at the exact temperature you prefer within one degree. The controlled flow rates ensure no sudden changes in water temperature, making every use safe and enjoyable for everyone in the family.

Pros

• Saves space with its small size: 11.5 x 8 x 3.75 inches.
• Provides endless hot water on demand.
• Saves energy by being 99% efficient; heats water only when needed.
• Ideal for low-flow applications, like bathrooms and small sinks.

Cons

• Needs professional installation, adding extra cost.
• Requires 125-amp electrical service for optimal operation; unsuitable for older homes with lower capacity.
• May struggle to provide hot water simultaneously to multiple outlets in colder climates.

The perfect fit for the EcoSmart ECO 11 Electric Tankless Water Heater is a homeowner looking to save space and energy while enjoying endless hot water in smaller applications. If you’re ready to join the revolution of efficient heating, make sure it’s on your list for the top 10 tankless water heaters of 2024!

Specifications

Brand	‎EcoSmart
Product Dimensions	‎8″W x 11.5″H
Display	‎LED Display
Color	‎White
Wattage	‎13000 watts
Voltage	‎220 Volts
Heat Output	‎11 Kilowatts
Manufacturer	‎Ecosmart
Item Weight	‎6.5 pounds
Item model number	‎ECO 11

3. Rheem 18kW 240V Tankless Electric Water Heater

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Upgrade to Endless Hot Water with Top 2024 Energy-Saving Model

The Rheem 18kW 240V Tankless Electric Water Heater stands out for its efficiency and user-friendly design. With features like a digital temperature display and external thermostatic control, users gain precise control over water temperatures. The model’s self-modulation system adjusts power to meet hot water demand, ensuring you use only the energy needed, making it eco-friendly and cost-effective. Its durable copper immersion heating elements are designed for longevity, and being field serviceable means homeowners can handle minor issues without always needing professional help.

Installation is straightforward thanks to its bottom 3/4 inch NPT water connections, which makes it an excellent choice for replacements or upgrades in your home system. The ability to provide up to 4.4 gallons per minute ensures that even during peak demand times, there won’t be fights over hot water. However, like any product, it has its drawbacks; some users might find the upfront cost high compared to traditional models but often realize savings over time.

We placed this model at No. 3 on our list due to its standout features combined with ease of use. It doesn’t quite reach the top due to higher-performing options for larger homes or more demanding situations. Still, it is ideal for many households seeking efficient and reliable hot water supply.

Features

• Easy to Replace and Install: This Rheem water heater comes ready with threaded connections, making it easy to replace your old unit or set up a new one. You won’t have to wrestle with complicated parts, giving you a smoother installation process right from the start.
• High-Quality Heating Elements: With two copper immersion heating elements, this heater is built for longevity. Copper heats up fast and lasts longer, giving you consistent hot water without frequent service interruptions.
• Smart Temperature Control: An external digital thermostat lets you adjust the temperature with pinpoint accuracy (+/-1 degree). The LED display makes reading and setting your desired heat level easy, ensuring your showers are always right.
• Efficient Water Flow: Experience up to 4.4 gallons of steady hot water flow per minute. Whether doing dishes, laundry, or taking back-to-back showers, this tankless heater keeps the hot water coming without skipping a beat.
• Self-Modulating Power: The most advanced feature of all – self-modulation. This patented technology means the heater adjusts its power output to meet the demand for hot water. It uses only as much energy as necessary, helping you save on electricity bills while enjoying endless hot water.

Pros

• Easy to replace and install with bottom 3/4 inch NPT water connections.
• Features durable copper heating elements that can be serviced in the field.
• Provides up to 4.4 GPM for steady hot water flow.
• Offers precise temperature control with an external LED display (+/ – 1 degree accuracy).

Cons

• Requires a large electrical supply, increasing installation costs.
• May not provide enough hot water for large families or multiple applications at once.
• Can be more expensive upfront compared to traditional tank heaters.

The perfect match for the Rheem 18kW 240V Tankless Electric Water Heater is a homeowner looking for a reliable and efficient way to get endless hot water, featured as one of the top picks in the 10 Best Tankless Water Heaters of 2024. Upgrade your home with this easy-to-install, energy-saving model today!

Specifications

Brand	‎Rheem
Product Dimensions	14.5″W x 18.25″H
Display	‎LED Display
Color	Gray
Wattage	‎18000 watts
Voltage	240 Volts
Heat Output	‎18 Kilowatts
Manufacturer	Rheem
Item Weight	14.78 pounds
Item model number	‎RTEX-18

4. Stiebel Eltron Tankless Water Heater – Tempra 24 Plus

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Ideal for Eco-Friendly Homes Needing Constant Hot Water and Savings

The Stiebel Eltron Tempra 24 Plus Tankless Water Heater stands out for its efficient and eco-friendly design. It’s a fantastic choice if you want endless hot water without wasting energy. This heater kicks into action only when you need hot water, saving up to 20% in energy costs compared to traditional tank heaters. Imagine enjoying a hot shower anytime, without waiting or worrying about running out of hot water. Plus, with no venting required and its compact size, it frees up space in your home for other uses.

This electric water heater operates easily with a digital display and preset temperatures. It’s designed with Advanced Flow Control technology by Stiebel Eltron. If the demand exceeds capacity, it slightly reduces flow so you won’t experience cold surprises during your shower. Also, installing the Tempra 24 Plus means you’re covered with strong warranties—7 years against leakage and 3 years for parts—which speaks about its reliability and performance quality.

With features like auto-modulation for energy saving and a built-in savings monitor, this model provides immediate access to hot water and does it in an economically friendly manner. The safety feature to limit maximum temperature prevents scalding accidents, making it ideal for homes with kids or elderly family members. This can be important in some installation scenarios such as large families or commercial spaces where consistent high-volume use is expected.

Features

• 7-Year Leakage and 3-Year Parts Warranties: Feel secure in your purchase. These solid warranties mean you’re covered if something goes wrong, ensuring peace of mind for years.
• Customizable Temperature Settings: With the Tempra 24 Plus, easily prevent scalding dangers by setting a max hot water temp of 109°F. This feature keeps everyone at home safe, which is especially important for families with kids.
• Hassle-Free Operation: Turn it on and forget about it! Enjoy quiet operation, digital temperature display, and memory buttons for your favorite settings. The copper heating system inside handles all the hard work efficiently.
• Saves Space and Energy: Its compact design fits anywhere without needing vents. It saves space and reduces energy bills thanks to auto-modulation and electronic flow control, which adjust according to use—making it very eco-friendly!
• Continuous Hot Water Flow: Never face cold shower surprises again! The Advanced Flow Control technology ensures your showers stay warm even when demand is high by smartly adjusting water flow without dropping the heat.

Pros

• Provides endless hot water instantly and on demand.
• Saves space with its compact, sleek design. No venting needed.
• Energy-efficient operation reduces electricity costs.
• Comes with warranties: 7 years for leakage and 3 years for parts.

Cons

• Requires 150 A of electric service, which may need an upgrade in some homes.
• Initial cost is higher compared to traditional water heaters.
• Reduced water flow when demand exceeds capacity.

The Stiebel Eltron Tempra 24 Plus is perfect for eco-conscious homeowners looking to save space and cut down on energy bills without sacrificing endless hot water, making it a top choice in the 10 Best Tankless Water Heaters of 2024. Make the switch today for comfort and savings!

Specifications

Brand	‎Stiebel Eltron
Product Dimensions	‎16.63″W x 14.5″H
Special Feature	‎LED Display
Color	‎White
Wattage	‎18000 watts
Voltage	‎240 Volts
Manufacturer	‎Stiebel Eltron
Item Weight	‎20 pounds
Country of Origin	‎Germany
Item model number	‎239222

5. Airthereal Electric Tankless Water Heater, 27kW, 240Volts

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Best for Endless Hot Showers with Space and Energy Savings

The Airthereal Electric Tankless Water Heater, 27kW, 240Volts, stands out as a top choice for families needing constant and efficient hot water supply. Its ability to provide endless on-demand hot water ensures that everyone in the house can enjoy their showers without worrying about running out of hot water or facing temperature drops. This model is especially handy for homes with multiple bathrooms, supporting up to three showers simultaneously. Its self-modulating temperature technology means it only heats water when necessary, saving up to 50% on energy costs compared to traditional tank heaters.

Installation requires a specific electrical setup with access to 240 volts and dedicated circuit breakers, so checking your breaker panel before purchase is crucial. Once installed, its safety features like high temp protection and dry heating protection offer peace of mind. Plus, the compact design frees up space in your home for other uses. Whether upgrading from an old tank heater or setting up a new house, the Airthereal EVT-27K brings efficiency and reliability into your daily routine.

Features

• Immediate Hot Water: Jump in the shower any time without waiting. The Airthereal Electric Tankless Water Heater provides hot water so everyone can enjoy a warm back-to-back shower with no cold surprises.
• Energy Saver: Save your money for fun things! This smart heater only warms up water when needed, reducing your energy bill by up to 50% compared to traditional tank heaters.
• Extra Safe: Feel secure knowing your family is protected. This heater has multiple safety features, such as high temperature, dry heating, and electrical leakage protection. Its design keeps water and electricity separate to avoid corrosion or leaks.
• Space Wizard: Make room for more of what you love. By ditching the bulky tank, this sleek wall-mounted heater frees up 90% of the space that a regular water heater would hog in your home.
• Installation Check: Get ready before you set it up. To install this powerhouse 27kW heater, ensure access to 240 volts through three double pole circuit breakers and proper wiring. It’s a small step to ensure endless hot showers ahead!

Pros

• Save energy: Only heats water when needed, reducing costs.
• Always have hot water: Never run out, even if you’re last in line for the shower.
• Safe to use: Features protection against high temperatures, dry heating, and electrical leaks.
• Saves space: Wall-mounted design frees up 90% more space than traditional tank heaters.

Cons

• Requires professional installation due to specific electrical needs.
• Initial setup costs can be high because of the required circuit breakers and wiring.
• May not work well in homes with low water pressure.

The Airthereal Electric Tankless Water Heater is perfect for families needing constant hot water without taking up too much space. It is a top pick in the 10 Best Tankless Water Heaters of 2024. Ensure your home meets the installation requirements and enjoy endless hot showers.

Specifications

Brand	‎AIRTHEREAL
Product Dimensions	‎3.43″W x 12.2″H
Special Feature	‎Instant Hot Water, High-Temperature Protection
Color	‎Black
Wattage	‎27000 watts
Voltage	‎240 Volts
Manufacturer	‎Airthereal
Item Weight	‎19 pounds
Item model number	‎EVT-27K

6. Thermomate Tankless Water Heater Electric 27kW 240 Volt 114A

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Upgrade to Endless Hot Water and Energy Savings in 2024

The Thermomate Tankless Water Heater Electric 27kW 240 Volt 114A is a game-changer for anyone looking to upgrade their home’s hot water system. It offers instant, endless hot water on demand, so you’ll never have to suffer through a cold shower again. What sets this model apart is its self-modulating power technology, which efficiently heats water only when needed, potentially slashing your heating costs by up to 60% compared to traditional tank heaters.

Installation is straightforward and safety-focused, with ETL certification ensuring protection against overheating and leaks. The digital display allows you to fine-tune water temperature in one-degree increments, making it easy to get that perfect shower every time. The compact design frees up floor space while fitting into tight spots.

This heater provides stable temperatures thanks to its unique feature of adjusting energy based on incoming water flow and temperature. For those living in larger homes or requiring significant amounts of hot water quickly and reliably, it represents an ideal solution that balances efficiency with performance.

Features

• Instant Hot Water Anytime: Enjoy endless hot water in 3 seconds with the Thermomate Tankless Water Heater. Say goodbye to waiting and cold showers.
• Saves Money & Energy: With self-modulating power technology, this heater only uses energy when heating water. This means up to 60% savings on your heating costs compared to traditional heaters. It makes your home more energy-efficient.
• Easy to Fit in Tight Spaces: Its compact and wall-mounted design allows for installation in any space, no matter how small. You won’t lose floor space, making it perfect for homes with limited room.
• Digital Display for Precise Temperature Control: The digital display allows you to easily adjust your water temperature. You can set it from 80°F to 140°F in one-degree increments, giving you complete control over your comfort.
• Low Maintenance & Long Lasting: The heating element is separated from the water tube, reducing scale build-up and corrosion. This means better performance over time and less maintenance needed, keeping things running smoothly without extra hassle.

Pros

• Saves up to 60% on water heating costs with 99.8% efficiency.
• Provides instant, endless hot water in just 3 seconds.
• Easy to install with safety features like overheating protection.
• Keeps water temperature stable for a comfortable shower every time.

Cons

• Requires professional installation due to high power needs.
• May not work well in areas with very cold incoming water temperatures.
• Large electrical demand could require a home’s electrical system upgrade.

The Thermomate Tankless Water Heater is perfect for homeowners looking for endless, instant hot water and savings on their energy bill. If that sounds like you, make the switch today and never fear a cold shower again.

Specifications

Brand	thermomate
Product Dimensions	‎13.12″W x 17.12″H
Display	‎LED Display
Color	Gray
Wattage	27 KW
Voltage	‎240 Volts
Heat Output	‎27 Kilowatts
Manufacturer	thermomate
Item Weight	‎22.1 pounds
Item model number	ET270

7. iHeat S-16 240V 66A 16KW Electric Tankless Water Heater

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Ideal for Saving Space and Cost, Great Near Ocean.

The iHeat Tankless S-16 240V 66A 16KW Electric Water Heater stands out for its efficiency and compact design. It’s built to save up to 60% on water heating costs, making it a smart choice for the budget-conscious homeowner. The stainless steel enclosure ensures durability and is suitable for locations near the ocean or in highly sterile environments. With its waterproof interactive touchpad, users can easily control temperature settings without worrying about safety.

This model shines in warmer climates such as Florida and California, capable of effortlessly handling the hot water demands of a 3- to 4-bedroom home. Whether taking two showers simultaneously or running the dishwasher and clothes washer together, this heater keeps up without missing a beat. It still offers great value for those living in cooler states as a point-of-use solution for single applications. Imagine never having to wait for hot water again – that’s what you get with the iHeat S-16, combining convenience with top-notch performance.

Features

• Saves Money on Heating: The iHeat Tankless S-16 uses less energy, saving you up to 60% on your water heating costs. This means more money in your pocket for other things.
• Waterproof TouchPad: Easily control water temperature with a waterproof interactive touchpad. There are no worries about damage or safety; making adjustments is simple and secure.
• Compact Design Saves Space: At 11.5 x 9 x 4.5 inches, the iHeat Tankless fits under counters and closets, freeing up room for other essentials in your home or office.
• Ideal for Clean Environments: It’s perfect for places that need to stay super clean, like commercial kitchens and hospitals, because it’s easy to maintain and doesn’t take up much space.
• Durable Near the Ocean: Made from stainless steel, this heater stands up well near salt water. It is great for homes by the sea, yachts, or beach resorts without worrying about corrosion.

Pros

• Saves up to 60% on water heating costs.
• Waterproof touchpad allows easy temperature control.
• Compact size fits under counters and in closets, saving space.
• Stainless steel construction is great for ocean-side locations and outdoor kitchens.

Cons

• Needs professional installation due to high electricity requirements.
• Might not work well in large homes with high water usage.
• Limited warranty coverage compared to similar products.

The iHeat S-16 240V 66A 16KW Electric Tankless Water Heater is perfect for eco-conscious families looking to cut heating costs and save space in their homes or any business needing clean, reliable hot water. Make the switch today and see why it’s among the top 10 best tankless water heaters of 2024.

Specifications

Brand	‎iHeat Tankless
Product Dimensions	‎7.7″W x 11.5″H
Color	‎Steel
Wattage	‎16000 watts
Voltage	‎240 Volts
Style	‎Outdoor
Manufacturer	‎iHeat Tankless
Part Number	‎S-16
Item Weight	‎8 pounds
Size	‎16 KW

8. Titan Electric Tankless Water Heater

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Save Space and Energy with a Top Tankless Heater of 2024!

The Titan Electric Tankless Water Heater stands out in the world of instant water heating. With its powerful 220 V and capability to handle up to 54 Max Amps, it’s designed for efficiency and reliability. Unlike traditional tanks, this tankless model provides hot water on demand, proving itself a smart choice for homes looking to save energy and space.

Users have praised the Titan N-120 for its easy installation process and compact design, which makes it an ideal upgrade from bulky, old-fashioned heaters. It delivers continuous hot water without the wait or waste often associated with tank systems. Its sleek build allows it to fit discreetly into various spaces without disrupting interior aesthetics. Whether renovating or replacing an outdated unit, the Titan provides performance that can significantly enhance your daily routine.

Features

• Instant Hot Water: The Titan Electric Tankless Water Heater gives you hot water right when needed. Say goodbye to waiting!
• Saves Space: This heater is a big space-saver since it’s tankless. You can fit it almost anywhere in your home.
• Energy-Efficient: It uses less power than traditional heaters, which means you save money on your electric bill.
• Powerful Output: With 54 max amps and 220 V, it’s strong enough to heat water fast for showers, dishes, and more.
• Long-lasting: Built to last, this heater ensures you won’t have to worry about replacing it anytime soon.

Pros

• Saves space because it’s tankless.
• Uses less electricity, saving you money.
• Heats water quickly whenever you need it.
• Works great for homes with 220 V power.

Cons

• Needs 54 amps, which may require an electrical upgrade.
• Works on 220 volts, not a fit for all homes.
• Being tankless, it might not provide hot water if multiple taps are used at once.

The Titan Electric Tankless Water Heater, with its 54 max amps and 220 V power, is perfect for homeowners looking to save space and reduce energy costs. It’s a must-have for making our list of the 10 Best Tankless Water Heaters of 2024. Make the switch today and enjoy endless hot water while reducing bills!

Specifications

Name	Value
Brand	‎Titan
Product Dimensions	‎9.6″W x 12″H
Color	‎White
Voltage	‎220 Volts
Style	‎Indoor Installation
Manufacturer	‎Niagara Industries Inc
Part Number	‎N-120
Item Weight	‎0.634 ounces
Item model number	‎N-120

9. Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater

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Upgrade to Endless Hot Water and Energy Savings in 2024

The Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater stands out for its efficiency and smart design, making it a great home choice. Its ability to heat water on demand ensures you’ll never run out of hot water during showers or while running appliances. The digital temperature display and external controls allow for precise temperature adjustments by increments of 1°F, providing personalized comfort. Plus, the model’s energy efficiency of 99.8% can lead to noticeable savings on electricity bills.

Installation is straightforward with the included adapters and side compression water connections, making it accessible even if you’re not very handy. The durable copper immersion heating elements are designed for longevity and can be serviced in the field. Users appreciate how this tankless water heater fits into compact spaces without sacrificing performance, highlighting its flow rate of up to 3.17 GPM as ideal for single-point use or multiple applications around the home.

Despite its many benefits, some users have noted that its performance might slightly decline in areas with extremely cold incoming water temperatures. However, most find that the Rheem RTEX-13 meets their needs perfectly, offering endless hot water with improved energy savings compared to traditional tank heaters. This blend of functionality and convenience places it among the top choices for residential tankless water heaters.

Features

• Easy Installation: Comes with 1/2 NPT adapters making it a breeze to set up. You’ll get your hot water flowing without any hassle.
• Energy Efficient: Boasting a 99.8% efficiency rate, this tankless water heater ensures you get more hot water using less energy. It’s good for the planet and your wallet.
• Adjustable Temperature: With external controls and a digital display, you can tweak the temperature by increments of just 1°F. Enjoy perfect hot water every time, exactly how you like it.
• Water-Saving Shower Head Included: The included 1.5 GPM shower head helps conserve water while still providing an enjoyable shower experience. You’ll save on your bills and help the environment, too.
• Durable and Serviceable Design: This model features durable copper immersion heating elements built to last and be easy to service, ensuring reliable hot water for years.

Pros

• Saves energy with 99.8% efficiency.
• Easy to install with simple instructions and included adapters.
• Lets you control water temperature precisely with external digital controls.
• Features durable copper heating elements for long-lasting use.

Cons

• Needs professional installation for safety and performance.
• High upfront cost compared to traditional water heaters.
• Not ideal for homes with high hot water demand simultaneously.

The ideal customer for the Rheem 240V Heating Chamber RTEX-13 Tankless Water Heater values energy efficiency and precise control over their hot water needs, making it a top pick for those looking to upgrade their home in 2024. Get ready to enjoy endless hot water and save on your bills with this sleek, easy-to-install heater today!

Specifications

Brand	‎Rheem
Product Dimensions	‎8.25″W x 12.63″H
Special Feature	‎LED Display
Color	‎Gray
Wattage	‎13 KW
Voltage	‎240 Volts
Maximum Flow Rate	‎3.17 Gallons Per Minute
Heat Output	‎13 Kilowatts
Manufacturer	‎Rheem
Part Number	‎RTEX-13

10. Rinnai RU199iN Condensing Tankless Hot Water Heater

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Endless Hot Water for Eco-Friendly Homes: A Top 2024 Pick

The Rinnai RU199iN Condensing Tankless Hot Water Heater stands out for its impressive efficiency and powerful performance. Certified as ENERGY STAR with a high Uniform Energy Factor of 0.105, it promises significant energy savings. Its design allows homeowners to enjoy up to 11 GPM of hot water, meaning you can run multiple appliances simultaneously. What makes this model even more appealing is its longevity; with a warranty of up to 15 years on the heat exchanger, it’s built to last.

Choosing this tankless water heater also means never running out of hot water again, thanks to its endless supply feature, which is compatible with Circ-Logic technology. This gives users instant access to hot water when they need it most—no more waiting for the shower to warm up in the mornings! Although professional installation is recommended, finding a qualified technician is easy through Rinnai’s website. The technician will ensure your unit is set up correctly for optimal performance.

Space-saving and energy-conserving, the Rinnai RU199iN not only caters to homes with high demand for hot water but does so in an eco-friendly manner. Its compact size frees up space in your home while reducing utility bills by heating water only when necessary. This blend of practicality and durability makes it a top choice among those looking for reliable tankless water heaters.

Features

• Saves Energy: The Rinnai RU199iN is ENERGY STAR qualified, using less gas to heat water. It heats water only when needed, cutting down your energy bills.
• Long-lasting Warranty: Enjoy peace of mind with a 15-year warranty on the heat exchanger, 5 years for labor, and 1 year for parts. This ensures your hot water flow keeps going strong year after year.
• Huge Flow Rate: With an impressive flow rate of up to 11 gallons per minute (GPM), this heater supports up to 7 appliances at one time. Never fight over hot water again!
• Compact and Efficient Design: Its tankless nature means it takes up less room in your home while providing endless hot water on demand, making it space-saving and convenient.
• Smart Features Available: Add the Controlr module (sold separately) for WiFi monitoring. You can adjust settings right from your phone for ultimate control and efficiency.

Pros

• Saves energy and space with its tankless design.
• Offers endless hot water for the whole home.
• Provides powerful water flow of up to 11 GPM for multiple appliances.
• Comes with great warranties: 15 years for heat exchanger.

Cons

• Requires professional installation, adding extra cost.
• Wifi monitoring needs an additional purchase of Controlr module.
• There may be high upfront costs compared to traditional water heaters.

The Rinnai RU199iN Condensing Tankless Hot Water Heater, with its energy-saving feature and ability to supply endless hot water, is perfect for eco-conscious homeowners who love the convenience of handling multiple tasks at once. If you value both efficiency and reliability in your home utilities, make this top choice from the 10 Best Tankless Water Heaters of 2024 yours today!

Specifications

Brand	Rinnai
Product Dimensions	9″W x 9″H
Color	Silver/Grey
Voltage	120 Volts

Factors to Consider When Choosing a Tankless Water Heater

When picking out a tankless water heater, think about what fuels it, how fast it can heat water, its size, how much energy it saves, and the guarantee it offers. Keep reading to learn more!

Fuel Type

Tankless water heaters come in two main types based on the fuel they use: natural gas and electric. Natural gas tankless water heaters offer high energy efficiency and lower operating costs, making them a popular choice for many households.

They require a natural gas line and proper ventilation to ensure safety. Electric tankless water heaters are great for homes without access to natural gas. Though their operating costs might be higher, they’re easy to install and don’t need venting.

Choosing between natural gas or electric depends on your home’s availability of fuel sources and installation requirements. Propane is another option for those without natural gas lines, as it can still provide reliable heating with widely available fuel.

Always consider energy efficiency ratings like Energy Star certification to save more on utility bills regardless of the type you choose.

Flow Rate

Flow rate measures how much hot water a tankless heater can generate in a given time, usually noted in gallons per minute (GPM). This factor is crucial because it affects the number of appliances that can simultaneously use hot water without experiencing a drop in temperature.

For instance, if you want to run the dishwasher while someone else takes a shower, you’ll need a heater with enough flow rate to handle both tasks at once.

Choosing the right size for your tankless water heater depends on calculating the maximum number of devices you plan to use together and their total flow demand. This ensures everyone gets hot water when they need it without waiting.

Keep this in mind, especially if your household often uses several fixtures at the same time.

Size and Installation Requirements

Choosing the right size for a tankless water heater needs careful thought. You must consider the groundwater temperature, how much hot water you use, and how well the heater works.

For families that need a lot of hot water at once, like when running dishwashers and showers together, picking a unit with enough capacity is vital. It’s also important to consider energy savings and whether your home can handle electric heaters or needs gas lines.

Installation demands special skills, especially for gas models, which require proper ventilation and gas line compatibility. Electric models may need changes to your electrical system or even extra breakers.

Always ask a pro for help with setup to make sure everything meets safety standards and works great from the start. This ensures your tankless water heater does its job efficiently without hitches.

Energy Efficiency

Tankless water heaters shine in energy efficiency. They use less energy because they only provide hot water when needed. This means no wasted energy heating up a big tank of water all day long.

Homes using 41 gallons or less of hot water daily see a 24%–34% increase in energy efficiency with these units compared to traditional storage tanks.

These high-efficiency models have an Energy Factor (EF) rating that tells you how well they convert electricity or gas into hot water. The higher the EF, the more efficient the heater is.

Look for ones that are ENERGY STAR certified to ensure top-notch performance and savings on utility bills. With smart features like self-modulating technology and advanced flow control, selecting an efficient model becomes easier than ever, making your home greener and reducing your carbon footprint without sacrificing comfort.

Warranty

Warranties for tankless water heaters usually range from 5 to 10 years. This period can tell a lot about the manufacturer’s confidence in their product. A longer warranty often means the heater is reliable and built to last.

Always read the details of the manufacturer’s warranty before making your purchase.

Choosing a tankless water heater with a strong warranty protects your investment. If something goes wrong, repair or replacement costs might be covered. Therefore, pay close attention to warranty length and what it includes, such as parts and labor coverage on heat exchangers, heating elements, and other critical components.

FAQs

1. What makes a tankless water heater better for my home?

Tankless water heaters heat water only when needed, saving energy and giving you endless hot water. They are also small, so they save space.

2. Can I install a tankless water heater outside?

Yes, some models are made for outdoor installation. This means they can work well even if put outside your house.

3. How do I choose the right size tankless water heater?

Look at how much hot water you use and the groundwater temperature where you live. The flow rate, measured in gallons per minute (GPM), and British Thermal Units (BTUs) also help decide the size.

4. Are there different types of tankless water heaters?

Yes! There are electric-powered ones and those that run on propane or liquid propane. Some are condensing with high efficiency, while others are non-condensing.

5. Do all tankless water heaters have temperature control?

Most modern tankless heaters let you control the temperature of your hot water precisely using a digital panel or controls.

6. Can I use a tankless water heater in an RV or small kitchen?