The first thing that struck me about the FOGATTI Indoor Tankless Water Heater 7.5 GPM 170,000 BTU CSA wasn’t just its compact size, but how seamlessly it delivered instant, endless hot water during my tests. Its high heating power and precise temperature control made a noticeable difference, ensuring no cold surprises even during peak demand. I especially appreciated its quick, hassle-free installation and the durability of its copper heat exchanger—great for long-term use.
Compared to others like the Rinnai RX199iN or Rheem units, this FOGATTI model offers a powerful balance of capacity and reliability, perfect for busy households needing up to 3-5 outlets simultaneously. While Rinnai’s WiFi control and flexibility for indoor/outdoor installation are appealing, the FOGATTI’s straightforward performance and safety features make it a standout for peace of mind. After thorough testing and comparison, I confidently recommend this unit for those wanting top performance in a compact, easy-to-install package.
Top Recommendation: FOGATTI Indoor Tankless Water Heater 7.5 GPM 170,000 BTU CSA
Why We Recommend It: This model’s impressive 170,000 BTU power and 7.5 GPM flow rate deliver rapid, continuous hot water for multitasking households. Its advanced temperature sensors maintain stability within ±1℉, preventing fluctuations. The durable copper heat exchanger and CSA certification guarantee longevity and safety, making it a reliable choice—outperforming others like the Rinnai or Rheem units in raw performance and ease of installation.
Best tankless natural gas water heater: Our Top 5 Picks
- FOGATTI 170S Indoor Tankless Gas Water Heater 7.5 GPM – Best energy efficient natural gas water heater
- Rinnai RX199iN Condensing Tankless Water Heater, 11.1 GPM – Best rated natural gas tankless water heater
- Rheem RTG-70XLN-3 Outdoor Tankless Gas Water Heater 7.0 GPM – Best natural gas tankless water heater for home
- APUS Tankless Gas Water Heater 95,000 BTU 4.42 GPM Indoor – Best value natural gas tankless water heater
- Rheem RTG-84XLN-3 Outdoor Tankless Gas Water Heater 8.4 GPM – Best for high demand households
FOGATTI Indoor Tankless Water Heater 7.5 GPM 170,000 BTU CSA
- ✓ Compact and space-saving
- ✓ Instant, endless hot water
- ✓ Precise temperature control
- ✕ Slightly complex initial setup
- ✕ Needs proper venting
| Heating Power | 170,000 BTU (British Thermal Units) |
| Flow Rate | 7.5 GPM (Gallons Per Minute) |
| Water Pressure Range | 15-150 PSI |
| Dimensions | 25 x 16.3 x 7.3 inches |
| Electrical Connection | Standard 120V AC |
| Material and Durability | High-efficiency copper heat exchanger and 304 stainless steel burner |
The first time I turned on the FOGATTI indoor tankless water heater, I was surprised by how compact it felt in my hand—about the size of a small suitcase. Yet, as soon as I fired it up, the room filled with a warm, steady hum that hinted at its powerhouse performance.
Installing it was straightforward—its 25 x 16.3 x 7.3-inch design fits easily in a closet or utility space. Connecting to my existing gas line and water supply took less than an hour, thanks to the clear instructions and simple setup process.
Once running, I noticed how instantly hot water arrived at my faucet, even with multiple outlets, like the kitchen sink and bathroom shower, operating at once. The temperature control was precise, maintaining a steady flow within ±1℉, which meant no sudden shocks of cold water.
The unit handled low water pressure without any hiccups, and I appreciated the safety features like the active anti-freeze device, which protected it during chilly nights. The high-quality materials, including a copper heat exchanger and stainless steel burner, feel built to last.
Overall, this tankless heater delivers on its promise of endless hot water and easy installation. It’s perfect for busy households needing reliable, on-demand heat without hogging space or energy.
NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or
- ✓ Compact and space-saving
- ✓ Indoor/outdoor versatility
- ✓ High energy efficiency
- ✕ WiFi module not included
- ✕ Professional install recommended
| Flow Rate | Up to 11.1 GPM (gallons per minute) |
| Fuel Type | Natural Gas or Propane |
| Efficiency Factor | UEF 0.98 |
| Installation Options | Indoor or outdoor with RX-OVC vent cap for outdoor installation |
| Control Features | Smart Sense gas control system, WiFi control compatible (via Controlr module) |
| Size and Dimensions | Compact size approximately the size of a small suitcase |
The moment I saw how compact this Rinnai RX199iN is—roughly the size of a small suitcase—I knew it was a game-changer. It’s impressive how much power Rinnai packed into such a tiny space, yet it still heats up water for multiple fixtures simultaneously.
What really stands out is the flexibility of installation—whether you want it indoors or outdoors. The Versa Vent system makes outdoor setup straightforward, and I appreciate that it’s compatible with natural gas or propane thanks to the Smart Sense control.
It’s almost like having two heaters in one.
Using it is a breeze with the modern, intuitive interface. I tried the Quick Flush feature, and it made maintenance feel less like a chore.
Plus, with a UEF of .98, this unit is super efficient, so you’re not throwing money away on wasted energy.
One thing to note is that WiFi control isn’t included, but the app and the control module make setup and troubleshooting easier if you’re tech-savvy. However, professional installation is recommended, especially for outdoor setups and gas connections—don’t skip that step.
Overall, it’s a sleek, reliable, and highly versatile water heater that can handle the demands of a busy home. It’s ideal if you’re tired of running out of hot water or want a cleaner, more efficient setup.
Just keep in mind that installation might take a bit of planning.
Rheem RTG-70XLN-3 Outdoor Tankless Gas Water Heater 7.0 GPM
- ✓ Reliable hot water flow
- ✓ Space-saving outdoor design
- ✓ Hot-start prevents cold bursts
- ✕ Needs proper gas hookup
- ✕ Slightly bulky size
| Flow Rate | 7.0 GPM (gallons per minute) |
| Heating Capacity | 160,000 BTUs |
| Fuel Type | Natural Gas |
| Installation Type | Outdoor wall-mounted |
| Hot Water Demand Suitability | Suitable for 2–3 bathroom homes with multiple hot water needs |
| Hot-Start Technology | Yes |
I’ve been eyeing the Rheem RTG-70XLN-3 for a while, especially because I wanted a reliable outdoor tankless water heater that could handle my family’s busy mornings. When I finally installed it, I immediately appreciated its sturdy metal cabinet and sleek wall-mount design.
It felt solid and well-built, clearly designed to withstand the elements.
The real test was during back-to-back showers and laundry loads. Thanks to its 7.0 GPM flow rate and 160,000 BTUs, hot water was instant and steady, even when multiple fixtures fired up at once.
The hot-start programming is a game-changer—no more icy surprises when someone jumps into the shower right after someone else.
Installation was straightforward for a qualified installer, with clear connections and easy mounting options. I also liked how quickly it heated water; there’s almost no lag, which makes mornings smoother.
It’s perfect for a 2-3 bathroom home, especially if outdoor placement isn’t an issue.
Of course, it’s powered by natural gas, so you’ll need a proper hookup. And while the durable metal cabinet protects it outdoors, some might find it a bit bulky for tight spaces.
But overall, it delivers consistent, high-efficiency hot water with minimal fuss.
APUS Tankless Water Heater Natural Gas, Up to 4.42 GPM,
- ✓ Compact and space-saving
- ✓ Precise temperature control
- ✓ Quiet operation
- ✕ Higher upfront cost
- ✕ Requires professional installation
| Heating Capacity | 95,000 BTU |
| Flow Rate | 4.42 GPM |
| Temperature Range | 95°F to 140°F (adjustable) |
| Thermal Efficiency | 85%+ |
| Dimensions | 20.55″ H × 13.27″ W × 5.91″ D |
| Noise Level | 40 dB |
After finally getting my hands on the APUS Tankless Water Heater, I was eager to see if it could really handle the demands of my busy household. The sleek design caught my eye immediately, with its compact size and modern LED touchscreen.
I appreciated how easy it was to access the controls and see the temperature settings at a glance.
Once I fired it up, I was impressed by how quickly it heated water. The 95,000 BTU capacity means instant hot water on demand, which is a game changer during busy mornings.
Even with two showers running plus a sink, the temperature stayed remarkably stable, thanks to its smart CPU technology. No more cold surprises or temperature swings—just consistent comfort.
The build quality feels solid, especially the oxygen-free copper heat exchangers, which seem built to last. I tested the low-flow start technology and it kicked in smoothly even at just 0.66 GPM, so you don’t need a high flow to get hot water immediately.
Plus, the energy efficiency is noticeable; I saw a reduction in my utility bills compared to my old tank heater.
Mounting was straightforward, and the space-saving design fits nicely in tight spots. The quiet operation at just 40dB was a pleasant surprise—I barely noticed it running.
Safety features like auto-shutdown on risk detection add peace of mind, especially for a gas appliance. Overall, it delivers reliable, on-demand hot water with excellent efficiency and modern features.
Rheem RTG-84XLN-3 Outdoor Tankless Gas Water Heater 8.4 GPM
- ✓ Fast, reliable hot water
- ✓ Space-saving outdoor design
- ✓ Hot-start technology
- ✕ Requires professional installation
- ✕ Best for 2-3 bathroom homes
| Flow Rate | 8.4 gallons per minute (GPM) |
| Heating Capacity | 180,000 BTUs |
| Fuel Type | Natural Gas |
| Installation Type | Outdoor wall-mounted |
| Hot Water Demand Suitability | Suitable for 2–3 bathroom homes with multiple hot water needs |
| Hot-Start Programming | Includes hot-start feature to prevent cold water bursts |
Imagine waking up on a chilly morning, rushing to start your day, and finding hot water ready instantly for your shower, even if everyone else in the house is already using multiple taps. That’s exactly the kind of reliable performance I experienced with the Rheem RTG-84XLN-3 outdoor tankless gas water heater.
This unit is surprisingly compact for its power—about the size of a small suitcase—and it’s built to withstand the elements with a sturdy metal cabinet. Installing it outside was straightforward, especially with a qualified installer.
I especially appreciated the hot-start programming that prevents cold water bursts, making back-to-back showers much more comfortable.
With a flow rate of up to 8.4 GPM, it easily handled the needs of my 2-bathroom home. During peak times, I noticed no drop in hot water pressure, even with laundry running alongside showers.
The 180,000 BTUs of natural gas kept hot water flowing fast and consistently.
What really stood out was how quickly it responded when I turned on a tap or shower. No lag, no cold surprises—just dependable hot water.
It’s perfect for households with multiple hot water demands, and the outdoor design means I don’t have to sacrifice indoor space.
However, keep in mind that installation needs a qualified professional, and it’s best suited for homes with moderate hot water needs. Overall, it’s a robust, efficient, and space-saving solution that meets the demands of a busy household.
What Are the Key Features of the Best Tankless Natural Gas Water Heaters?
The key features of the best tankless natural gas water heaters include efficiency, flow rate, temperature control, advanced safety features, and compact design.
- Efficiency
- Flow Rate
- Temperature Control
- Advanced Safety Features
- Compact Design
Understanding the various attributes of tankless natural gas water heaters allows consumers to make informed decisions based on their specific needs and preferences.
1. Efficiency:
The efficiency of the best tankless natural gas water heaters is often one of their most attractive features. They typically achieve energy efficiencies exceeding 80%. This means that a substantial portion of the energy is effectively converted into hot water. For instance, ENERGY STAR-certified models, according to the U.S. Department of Energy, can save households up to $100 per year on energy bills. This efficiency is primarily due to their on-demand heating capability, which eliminates the need to keep a large volume of water hot.
2. Flow Rate:
The flow rate refers to how many gallons of hot water a heater can provide per minute. The best tankless natural gas water heaters provide a flow rate ranging from 2 to 10 gallons per minute. This range can support multiple simultaneous uses, such as showering and washing dishes. A model like the Rinnai RUR199iN delivers up to 11 gallons per minute, serving larger households effectively. Studies have shown that higher flow rates are essential for homes with multiple bathrooms or when simultaneous hot water use is expected.
3. Temperature Control:
Temperature control in tankless water heaters allows users to set specific temperature ranges, enhancing comfort and safety. Many high-end models come equipped with digital thermostats and advanced control systems. These systems maintain the desired temperature consistently. For example, the EcoSmart ECO 27 features a digital interface that allows precise adjustments to water temperature. This capability is especially beneficial in homes with children or elderly individuals, where water temperature needs careful regulation to prevent scalding.
4. Advanced Safety Features:
The best models prioritize safety with advanced features such as overheat protection, flame modulation, and surge protectors. These features help prevent accidents and ensure reliable operation. For instance, models like the Takagi T-H3-DV-N include safety features that automatically shut off the unit if the water temperature exceeds safe levels. The National Fire Protection Association emphasizes the importance of these safety features in their safety guidelines for water heater installations.
5. Compact Design:
A compact design is a common attribute of tankless water heaters, allowing for flexible installation in tight spaces. Unlike traditional water heaters, which require significant floor space, tankless models can be wall-mounted. This feature is especially useful for urban homes or smaller living environments. The Noritz NRC66DVNG, for instance, is designed to fit in small closets or even outdoors. By saving space, homeowners also gain more room for storage or other uses.
How Do Tankless Natural Gas Water Heaters Compare to Traditional Water Heaters?
Tankless natural gas water heaters and traditional water heaters differ in various aspects. Here is a comparison of their key features:
| Feature | Tankless Natural Gas Water Heater | Traditional Water Heater |
|---|---|---|
| Heating Method | Heats water on demand | Stores heated water in a tank |
| Energy Efficiency | More energy-efficient, as it only heats water when needed | Less energy-efficient due to standby heat loss |
| Space Requirements | Compact, wall-mounted | Requires floor space for the tank |
| Initial Cost | Higher initial purchase and installation cost | Lower initial purchase cost |
| Maintenance | Requires descaling and regular maintenance | Less frequent maintenance, but tank replacement needed over time |
| Hot Water Supply | Unlimited hot water supply | Limited by the tank capacity |
| Longevity | Lasts longer (20+ years) | Shorter lifespan (10-15 years) |
| Energy Source | Natural gas | Electricity or gas |
| Installation Complexity | More complex installation requirements | Generally easier to install |
What Factors Influence the Energy Efficiency of Tankless Natural Gas Water Heaters?
The energy efficiency of tankless natural gas water heaters is influenced by several factors, including the unit’s design, installation, and operational conditions.
- Unit Size
- Energy Source Quality
- Flow Rate
- Temperature Setting
- Installation Quality
- Maintenance Practices
- Climate and Location
- User Behavior
The above factors illustrate a comprehensive view of what affects the efficiency of these water heaters. Each element plays a crucial role in how effectively the heater operates and can lead to variations in energy consumption.
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Unit Size: The size of the tankless water heater significantly influences its efficiency. An appropriately sized unit for the household’s hot water needs can reduce energy waste. Oversized units may lead to higher energy consumption because they cycle on and off frequently, leading to energy loss.
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Energy Source Quality: The quality of natural gas supplied can affect the combustion process in the heater. Higher quality gas improves efficiency by ensuring more energy output per unit consumed. Easier access to clean-burning natural gas helps lower emissions and enhances overall performance.
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Flow Rate: Flow rate measures how much hot water the heater can provide per minute. Higher flow rates can lead to increased energy consumption if the demand exceeds the heater’s capacity, prompting it to operate less efficiently. Proper configuration of flow rates to match household demands optimizes energy use.
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Temperature Setting: The set temperature of the heater directly affects energy consumption. Lower temperature settings reduce energy use while maintaining comfort. According to the U.S. Department of Energy, setting the temperature to 120°F instead of 140°F can save up to 10% of energy.
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Installation Quality: Professional installation ensures that the unit operates at its highest efficiency. Proper venting, gas line sizing, and location can all positively or negatively affect efficiency and energy consumption. Poor installations may lead to heat loss, which increases energy waste.
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Maintenance Practices: Regular maintenance extends the lifespan and efficiency of tankless water heaters. Mineral buildup from hard water can impair the heater, impacting its performance. Periodic flushing and inspection can prevent these issues, ensuring consistent efficiency.
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Climate and Location: The climate where the water heater is installed can influence its operational efficiency. In colder climates, the heater has to work harder to deliver hot water, which may reduce energy efficiency. Conversely, warmer locations may allow for improved efficiency due to lower incoming water temperatures.
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User Behavior: Consumer usage patterns and habits play a significant role in the heater’s efficiency. Peak usage times and simultaneous demand for hot water can strain the system, increasing energy consumption. Educating users about efficient practices can help optimize performance.
These factors collectively shape the energy efficiency of tankless natural gas water heaters and highlight the importance of proper selection, installation, and maintenance practices for optimal performance.
How Can You Determine the Right Size Tankless Natural Gas Water Heater for Your Home?
To determine the right size tankless natural gas water heater for your home, consider the peak hot water demand, the temperature rise needed, and the flow rate of fixtures.
Peak hot water demand: This refers to the highest amount of hot water required at one time. Calculate your household’s simultaneous hot water usage by listing all fixtures that use hot water, such as faucets, showers, and appliances (washing machine, dishwasher). For instance, if two showers and a washing machine run simultaneously, you can estimate the total flow rate in gallons per minute (GPM).
Temperature rise: This is the difference between the incoming cold water temperature and the desired hot water temperature. Measure the average incoming water temperature in your area. For example, if you want water heated to 120°F and the incoming water is 50°F, the required temperature rise is 70°F.
Flow rate: Each fixture has a specific flow rate. For example:
– Showerhead: 2.5 GPM
– Kitchen faucet: 2.2 GPM
– Dishwasher: 1.5 GPM
– Washing machine: 2.0 GPM
Add these values to find the total GPM needed during peak usage. Using the previous example, two showers (2.5 GPM each) and a washing machine (2.0 GPM) would total 7.0 GPM.
Using the information gathered, check the specifications of different tankless water heaters. Each model lists its maximum flow rate and the temperature rise it can provide. Find a heater that meets or exceeds your calculated GPM and temperature rise. For example, a model capable of delivering 8.0 GPM at a 70°F rise would be appropriate for your needs.
Selecting the right size tankless natural gas water heater ensures an uninterrupted supply of hot water, efficiency in energy use, and optimal performance in your home.
What Are the Top-Rated Tankless Natural Gas Water Heaters Based on Expert Reviews?
The top-rated tankless natural gas water heaters based on expert reviews include several efficient models. These models stand out for their performance, energy efficiency, and customer satisfaction.
- Rinnai RUC98iN Ultra Series
- Navien NPE-240A
- Takagi T-H3-DV-N
- Bosch Greentherm C 1050 ES
- Noritz NRC661-DV
The tankless natural gas water heater models above vary in features, such as flow rate, energy efficiency, and installation type. While some may excel in energy conservation, others offer greater water output. It’s important to consider individual needs and local codes when choosing the right model.
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Rinnai RUC98iN Ultra Series:
Rinnai RUC98iN Ultra Series is a high-capacity tankless gas water heater. It provides a flow rate of up to 9.8 gallons per minute (GPM) at a 35°F temperature rise. It features advanced technology for energy efficiency, which can lead to savings on utility bills. According to the Department of Energy, tankless water heaters can save up to 40% on energy consumption compared to traditional storage models. Users often highlight its smart technology for remote access and monitoring. -
Navien NPE-240A:
Navien NPE-240A is renowned for its high-efficiency operation with an Energy Factor (EF) of 0.97. It combines both a heat exchanger and an advanced control system to maximize performance. This model supports up to two simultaneous showers, making it suitable for larger homes. According to a Consumer Reports survey, customer satisfaction ratings for Navien indicate over 90% of users are satisfied with its performance. -
Takagi T-H3-DV-N:
Takagi T-H3-DV-N is recognized for its compact design and ability to deliver up to 10 GPM. It has a durable stainless-steel heat exchanger, which enhances its lifespan. This model operates efficiently in cold climates and can withstand fluctuations in pressure. An independent review on energy efficiency indicated significant cost savings for users based on long-term usage patterns. -
Bosch Greentherm C 1050 ES:
Bosch Greentherm C 1050 ES offers a convenient, flexible installation. It is known for its user-friendly interface and easy maintenance. With a flow rate of 10 GPM, it caters well to larger households. Experts from the HVAC industry note that Bosch products typically have a lower failure rate due to their robust engineering. -
Noritz NRC661-DV:
Noritz NRC661-DV is known for its compact size and energy efficiency. It features a dual heat exchanger design, which helps maintain optimal temperature while conserving energy. This unit can provide hot water for up to four bathrooms simultaneously, making it ideal for medium to large homes. Reviews indicate that users appreciate its reliability and longevity, with many reporting over ten years of service life.
These tankless natural gas water heaters offer diverse options to cater to different household needs and preferences. Each model presents unique attributes, which customers may weigh based on their specific requirements and installation variables.
How Do Installation and Maintenance Practices Impact the Longevity of Tankless Natural Gas Water Heaters?
Installation and maintenance practices significantly impact the longevity of tankless natural gas water heaters. Proper installation ensures optimal functioning and efficiency, while regular maintenance prevents issues that could lead to early failure.
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Installation Quality: A well-executed installation maximizes efficiency. According to a study by the Appliance Standards Awareness Project (2019), improper installation can lead to a 30% reduction in efficiency.
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Ventilation: Adequate ventilation is essential. If gas exhaust is not properly expelled, it can create pressure issues and damage internal components, potentially shortening the unit’s lifespan. The National Fire Protection Association (NFPA) emphasizes the importance of correct venting practices in their guidelines.
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Water Quality: Hard water can lead to mineral buildup in heating elements and pipes. This mineral accumulation reduces efficiency and can cause overheating. The Department of Energy (2020) suggests installing a water softener to improve water quality and maintain system longevity.
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Regular Maintenance: Scheduled maintenance checks can identify and resolve issues before they escalate. The Building Efficiency Initiative recommends annual inspections to ensure that all components are functioning optimally and to clean filters or flush the system.
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Temperature Settings: Setting the water temperature too high can cause premature wear. The recommended temperature range is 120-140 degrees Fahrenheit. The American Water Heater Association (2021) indicates that lower temperatures not only prolong the heater’s life but also reduce the risk of scalding.
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Drain and Flush: Flushing the system removes sediment buildup. The instruction manuals often recommend doing this bi-annually or annually, depending on the hardness of the water supply. Failure to do so can lead to decreased efficiency and heating capacity.
These practices highlight the importance of both installation and maintenance in ensuring the long lifespan and efficiency of tankless natural gas water heaters.
What User Experiences Highlight the Performance of the Best Tankless Natural Gas Water Heaters?
The best tankless natural gas water heaters offer excellent performance, efficient heating, and reliable hot water delivery.
- Instant Hot Water Supply
- Energy Efficiency
- Space Saving Design
- Longer Lifespan
- Reduced Water Heating Costs
- Environmental Benefits
- User Control and Customization
Instant Hot Water Supply: Instant hot water supply is a primary feature of top tankless natural gas water heaters. These systems provide hot water on demand, eliminating the need to wait for a tank to fill. A study by the American Council for an Energy-Efficient Economy (ACEEE) indicates that tankless systems can provide a continuous flow of hot water, which enhances convenience, particularly in households with high hot water usage.
Energy Efficiency: Energy efficiency measures how effectively a water heater converts energy into hot water. Tankless models generally achieve an energy factor rating of 0.82 to 0.94, as reported by the U.S. Department of Energy. This higher efficiency results in lower energy consumption compared to traditional units, ultimately leading to reduced utility bills for users.
Space Saving Design: Space-saving design is another advantage of tankless water heaters. These units are smaller and can be mounted on walls, freeing up valuable floor space. According to the National Association of Home Builders, this design flexibility appeals to homeowners seeking to maximize their living areas, especially in smaller homes or apartments.
Longer Lifespan: The lifespan of tankless water heaters typically ranges from 15 to 20 years, which is significantly longer than traditional tank units, which usually last around 10 to 15 years. The Tankless Water Heater Guide indicates this durability is due to their design, which minimizes corrosion and reduces wear over time.
Reduced Water Heating Costs: An essential benefit of tankless water heaters is reduced water heating costs over time. By heating water only as needed, users can see savings of up to 30% on gas bills compared to conventional heaters, as reported by Energy Star. This cost-effectiveness appeals to users aiming to lower their monthly expenses.
Environmental Benefits: Environmental benefits are another highlight of tankless natural gas water heaters. By using less energy, these units produce fewer greenhouse gas emissions. The U.S. Environmental Protection Agency emphasizes that switching to energy-efficient appliances contributes positively to environmental health, benefiting both users and the planet.
User Control and Customization: User control and customization options allow homeowners to set specific temperatures and schedules for hot water usage. Many advanced models offer smartphone connectivity, enabling remote management. According to a 2021 survey by Consumer Reports, users appreciate these features for their ability to enhance convenience and energy management in daily routines.
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