If you're tired of waiting for hot water to flow from your faucets and tired of bulky traditional water heaters taking up valuable space in your home, it's time to consider upgrading to the best tankless water heater.
With their cutting-edge technology and space-saving design, these innovative appliances offer a continuous supply of hot water on demand, without the need for a bulky storage tank. But with so many models and brands on the market, finding the best tankless water heater for your home can be a daunting task. In this guide, we'll help you navigate through the top-rated options and discover the perfect tankless water heater to suit your needs, budget, and lifestyle.
Top 10 Best Tankless Water Heater
Whether you are thinking of building a new home or replacing your old water heater, we have prepared a list of the best tankless water heaters that enhances your convenience.
Going through these products will help you know the unique features that come with each model, allowing you to make a more informed decision.
Takagi T-H3S-DV-N Indoor Tankless Water Heater
Best for large household
6.6 GPM Max
Rinnai RUC98iN Ultra Series
Best for family safety
Rheem RTEX-13 240V Residential
Best for medium sized household
ECOTOUCH 9KW 240V on Demand Water Heater
min 0.5 GPM
Camplux Pro 6L Outdoor Portable Propane
Best for outdoor shower
Noritz NRC661-DV-NG Indoor Condensing Direct
Best for multiple applications
Stiebel Eltron Tankless Water Heater
min 0.37 GPM
TC-Home 12L Natural Gas Tankless Hot Water
EcoSmart ECO 11 Electric Tankless Water Heater
Best for energy savings
Eemax EEM24018 Electric Tankless Water Heater
Best as Electric Heater
Takagi Takagi T-H3S-DV-N Indoor Water Heater
Height: 22.50" | Width: 17.75" | Depth: 10.75" | Product Weight: 71 lbs. | Vent Type: Direct Vent | Vent Size: 4" | Emissions: Ultra Low NOx | Maximum BTUs: 180,000 | Minimum BTUs: 0 | Water Connection Location: Bottom | Water Connection: 3/4" | Flow Rate: 8.00 | Heat Exchanger: Copper & Stainless | Voltage: AC 120V | UEF: 0.95 | ENERGY STAR® Qualified: Yes | LEED Rating: 1.5 | Remote Control: No | Technology: Condensing | Multilink: No
The Takagi T-H3S-DV-N Indoor Water Heater is a highly efficient and reliable tankless water heater that can provide an endless supply of hot water for your home or business. This unit is powered by natural gas and boasts an impressive flow rate of up to 8 gallons per minute, making it ideal for larger households with high hot water demands.
One of the standout features of this water heater is its advanced safety features, including an overheat cutoff fuse, freeze protection, and surge protection. Additionally, it features a digital remote control that allows you to adjust the temperature and monitor the performance of the unit easily.
This tankless water heater has impressive ability to generate as much heat as 180,000 BTU (British thermal units) per hour. This performance allows it to produce hot water in cold areas while consuming less energy when compared to traditional models.
The compact design of the Takagi T-H3S-DV-N Indoor Water Heater makes it an excellent space-saving option, perfect for homes with limited space. It also offers efficient energy consumption, saving you money on your monthly utility bills.
Overall, the Takagi T-H3S-DV-N Indoor Water Heater is an excellent choice for those looking for a high-performing and reliable tankless water heater with advanced safety features and impressive flow rates.
Rinnai RUC98iN Ultra Series Water Heater-Natural Gas
Height: 26" | Width: 18.5" | Depth: 10.1" | Product Weight: 61.7 lbs. | Hot water flow range: .26-9.8 gpm | Activation GPM: 0.4 | Connection: ¾” NPT | Electrical Supply: 115 Volts - 1 Phase - 60 Hertz | Energy Efficiency: 95.00 | Hertz: 60 Hz | Water Pressure / Max PSI: 150 | Water Pressure / Min PSI: 20 | Fuel Type: Natural Gas | Gas Connection Type: 3/4" MNPT | Water Connection Type: 3/4" MNPT | Amperage: 8.00 | BTU/hr Max: 199000 | Voltage: 115 | BTU/hr Min: 15200 | Remote Included: Yes | Electronic: Yes | Energy Star: Yes
Ultra Low Nitrogen Oxide emissions
When selecting the best tankless water heaters, you also need to ensure that it has low Nitrogen Oxide emissions. This unit has ultra low Nitrogen Oxide emission ensuring that your family is safe.
The Rinnai RUC98iN Ultra Series Water Heater is a top-performing tankless water heater that offers a high flow rate and exceptional energy efficiency. This natural gas-powered unit is ideal for larger households with high hot water demands, boasting an impressive flow rate of up to 9.8 gallons per minute.
One of the standout features of this water heater is its compact and space-saving design. It can be installed in small spaces, freeing up valuable room in your home. Additionally, it offers precise temperature control, so you can enjoy hot water at your desired temperature.
Another notable feature of the Rinnai RUC98iN is its innovative condensing technology, which captures and reuses heat that would typically be lost in traditional water heaters, resulting in up to 96% energy efficiency.
Furthermore, the RUC98iN comes equipped with advanced safety features, including a temperature lock function and overheating protection, ensuring your peace of mind.
In summary, the Rinnai RUC98iN Ultra Series Water Heater is a reliable, high-performance tankless water heater that offers impressive energy efficiency and flow rate, coupled with advanced safety features and precise temperature control, making it an excellent choice for larger households looking for a top-quality water heater.
Rheem RTEX-13 240V Heating Chamber Residential Water Heater
Height: 12.63" | Width: 8.25" | Depth: 3.63" | Product Weight: 8.5 lbs. | Water flow range: 3.17 gpm | UEF: 99.8% | Voltage: 240V | Amperage: 54 Amps | Required Breaker: 60 Amp | Wire Size: 6 AWG | Power: 13 kW | Energy Source: Electric | Water Connection: 1/2 Inch NPT | Warranty: Heating Chamber - 5 Years, Parts - 1 Year
The Rheem RTEX-13 240V Heating Chamber Residential Water Heater is a compact and efficient electric tankless water heater, ideal for small to medium-sized households. It has a sleek and modern design that is easy to install, making it a popular choice among homeowners.
One of the standout features of this unit is its digital temperature control, allowing you to set the temperature precisely according to your preference. This feature is especially useful for families with young children or elderly members who may need lower temperatures.
The RTEX-13 also boasts a self-modulating power control system, which adjusts the energy consumption based on the hot water demand, resulting in energy efficiency and cost savings.
You are provided with the step by step guide as well as the tools needed. The unit also comes with 0.5 NPT adapter and 3-foot electric cable.
Another advantage of this water heater is its durability and ease of maintenance. It features a durable copper immersion heating element, and the unit's modular design makes it easy to replace any faulty parts without having to replace the entire system.
Overall, the Rheem RTEX-13 240V Heating Chamber Residential Water Heater is an excellent option for small to medium-sized households, offering precise temperature control, energy efficiency, and easy maintenance. Its compact design makes it a space-saving option that can easily fit into small areas.
K&J 12kW Thermoflow Tankless Water Heater
The K&J 12kW Thermoflow Tankless Water Heater promised to offer more than enough for the price. It is a reliable and cost-effective option for homeowners seeking an efficient and practical solution to their hot water needs. With a power output of 12kW, this electric water heater can produce up to 2.5 gallons of hot water per minute, making it suitable for smaller households.
One of the standout features of this unit is its advanced digital control panel, which allows you to adjust the temperature and water flow rate easily. The panel also displays error codes and other system information, making troubleshooting and maintenance a breeze.
Another advantage of the K&J Thermoflow is its compact design, which makes it easy to install in tight spaces, such as closets or under sinks. This tankless water heater also features a durable stainless steel heating element, ensuring longevity and reliability.
Furthermore, the K&J 12kW Thermoflow Tankless Water Heater is eco-friendly, as it only uses energy when hot water is being used, resulting in lower energy bills and reduced carbon footprint.
Overall, the K&J 12kW Thermoflow Tankless Water Heater is an excellent option for smaller households seeking a cost-effective and efficient hot water solution. With its compact design, digital control panel, and eco-friendly features, it's a reliable and practical choice for homeowners looking to upgrade their hot water system.
Camplux Pro 6L 1.58 GPM Outdoor Portable Propane Water Heater
Height: 17.32" | Width: 11.61" | Depth: 4.33" | Product Weight: 14 lbs. | Size: 6L | Water Pressure: 3.0～110.0 PSI | Hot Water Output: 1.58 gpm | BTU/hr Max: 41,000 | Max. temperature: 114.8℉(46℃) | Min. temperature: 46.4℉( 8℃) | Voltage: 3 volts | Power: 2 "D" cell batteries | Wattage: 12 KW | Hose Length: 5 Feet | Average Battery Life: 180 days
The Camplux Pro 6L 1.58 GPM Outdoor Portable Propane Water Heater is an excellent choice for outdoor enthusiasts who require hot water on the go. This compact and portable propane-powered water heater is designed to provide hot water for outdoor showers, camping trips, and other outdoor activities.
One of the standout features of this unit is its lightweight and compact design, making it easy to transport and store. It comes with a convenient carry handle, allowing you to take it anywhere you go. The Camplux Pro 6L is also easy to install and operate, with no need for electricity or complex plumbing.
This water heater has a powerful burner that can produce hot water at a rate of 1.58 gallons per minute, with an adjustable temperature range of 46.4°F - 114.8°F, ensuring a comfortable shower experience even in colder weather.
The Camplux Pro 6L is also built to last, with a durable stainless steel construction that can withstand harsh outdoor conditions. It features an anti-freezing protection system, which prevents damage to the unit in low temperatures, ensuring reliable performance in any weather.
Overall, the Camplux Pro 6L 1.58 GPM Outdoor Portable Propane Water Heater is an excellent option for outdoor enthusiasts seeking a portable and reliable hot water solution. With its lightweight and compact design, powerful burner, and durable construction, it's a great investment for anyone who enjoys camping, RV trips, or outdoor showers.
Noritz NRC661-DV-NG Indoor Direct Hot Water Heater
Height: 20.5" | Width: 13.8" | Depth: 6.7" | Product Weight: 39 lbs. | Size: 6L | NG & LP: Natural Gas/Propane | Capacity Range: 0.5 - 6.6 GPM | BTU/hr Max: 120,000 | Temperature Settings: 100-140°F (In 5°F intervals) (9 Options) | UEF: 0.89 | Warranty Description: 12 Year Heat Exchanger, 5 Year Parts, 1 Year Labor
The Noritz NRC661-DV-NG Indoor Direct Hot Water Heater is a high-quality and efficient tankless water heater suitable for small to medium-sized households. With a gas input of up to 120,000 BTUs, it can provide a flow rate of up to 6.5 gallons per minute, ensuring a steady supply of hot water for multiple applications.
One of the standout features of this unit is its advanced technology, including an internal bypass line and a dual flame burner that ensures consistent water temperature and reduces the risk of scalding. It also comes with a digital remote control, allowing for easy temperature adjustment and water flow rate control.
The Noritz NRC661-DV-NG Indoor Direct Hot Water Heater is designed with durability in mind, with a sturdy stainless steel heat exchanger and a high-temperature safety circuit that prevents overheating. It's also eco-friendly, as it's Energy Star certified, ensuring energy efficiency and reducing utility costs.
Additionally, the Noritz NRC661-DV-NG is easy to install and maintain, with a compact design that saves space and a built-in air-fuel ratio sensor that automatically adjusts for optimal combustion.
Overall, the Noritz NRC661-DV-NG Indoor Direct Hot Water Heater is an excellent investment for homeowners seeking a high-quality and efficient tankless water heater. With its advanced technology, durable construction, and eco-friendly features, it's a reliable and practical choice for anyone looking to upgrade their hot water system.
SioGreen IR4000 240V/40A Infrared Electric Hot Water Heater
SioGreen IR4000 is a decent tankless water heater for small to medium-sized family home. This unit is reasonably priced and falls in the mid-range price, making it a decent choice for budget-conscious buyers.
The SioGreen IR4000 240V/40A Infrared Electric Hot Water Heater is a unique and innovative tankless water heater that uses infrared technology to heat water, making it more efficient and eco-friendly than traditional water heaters.
One of the standout features of this unit is its compact and lightweight design, making it easy to install and suitable for both residential and commercial use. It also has a durable construction with a stainless steel housing that is corrosion-resistant and long-lasting.
The SioGreen IR4000 uses infrared technology to heat water, eliminating the need for heating elements and reducing the risk of corrosion and mineral buildup. It also has an adjustable temperature range of 86°F - 122°F, making it suitable for a variety of applications.
This water heater is also energy-efficient, using up to 60% less energy than traditional water heaters, which can save homeowners significant amounts of money on their utility bills. It also has a self-cleaning function that prevents the buildup of mineral deposits, ensuring that it operates at peak efficiency for years to come.
Overall, the SioGreen IR4000 240V/40A Infrared Electric Hot Water Heater is an excellent choice for homeowners looking for an innovative and eco-friendly tankless water heater. With its infrared technology, compact design, and energy-efficient features, it's a reliable and practical investment for anyone looking to upgrade their hot water system.
TC-Home 4.2 GPM 12L Tankless Hot Water Heater
Product Weight: 20.94 lbs. | Water flow rate: 4.2 GPM | Working temperature: -8-45℃ | Gas inlet: G1/2" | Vent Type: 4.3" Flue Duct | Wattage: 32000 watts | Thermal efficiency: ≥80.8% | Off self-timer: 20 min. | Temperature rise: 25℃ | Electrical requirement: Two 'D' size batteries | Cover Material: Cold Rolled Sheet | Minimum working water pressure: 0.025MPa | Fire Catching Ways: Automatic | Gas pressure: 2000Pa
TC-Home 4.2 GPM come with an impressive space saver design that allows you to install anywhere in your home. It has simple controls that make it easy to customize your needs.
The TC-Home 4.2 GPM 12L Tankless Hot Water Heater is a budget-friendly option for households in need of a reliable source of hot water. It boasts a flow rate of up to 4.2 gallons per minute, making it a great option for households with multiple bathrooms or sinks that need hot water simultaneously.
This tankless water heater has a compact and lightweight design, making it easy to install and suitable for small spaces. The digital display on the unit shows the current temperature, allowing users to easily adjust the temperature as needed.
The TC-Home 4.2 GPM 12L Tankless Hot Water Heater is built to last, with a durable stainless steel exterior that is corrosion-resistant. It features a copper heating element that ensures efficient and reliable heating of the water.
While this unit may not have all the bells and whistles of more expensive models, it offers a cost-effective solution for households in need of a reliable source of hot water. The TC-Home 4.2 GPM 12L Tankless Hot Water Heater is a solid choice for homeowners looking for an affordable and efficient option for their hot water needs.
EcoSmart ECO 11 Electric Tankless Water Heater
Height: 11.5" | Width: 8" | Depth: 3.75" | Product Weight: 6.5 lbs. | Hot water flow rate: 2 GPM | Temperature Settings: 80-140°F | Wattage: 13 KW | Voltage: 240V | Max Amperage: 57 | Water Connections: 1/2" CF | Activation Flow: 0.3 GPM | Uniform Energy Factor: 0.98
The EcoSmart ECO 11 Electric Tankless Water Heater is a high-performance unit that is designed to provide homeowners with energy-efficient and cost-effective hot water. With a compact and lightweight design, it can be easily installed in small spaces, making it an excellent choice for apartments, condos, and small homes.
This water heater is equipped with self-modulating technology, which means it automatically adjusts the energy usage to match the hot water demand, resulting in more energy savings. It can provide up to 2 gallons of hot water per minute, which is suitable for a single bathroom or a small kitchen.
The EcoSmart ECO 11 also features a digital temperature control that allows you to set the desired temperature to within 1 degree Fahrenheit, ensuring that you always have the perfect temperature for your hot water needs. The unit also has a durable copper and stainless steel construction, which makes it resistant to corrosion and increases its lifespan.
Overall, the EcoSmart ECO 11 Electric Tankless Water Heater is an excellent choice for homeowners who are looking for an energy-efficient, cost-effective, and reliable source of hot water. With its compact design, advanced features, and durable construction, it is a solid investment that can provide years of hassle-free hot water.
WiseWater Water Heater 25.6kW Hot Water Heater
The WiseWater Water Heater 25.6kW Hot Water Heater is a powerful tankless water heater designed to provide efficient and reliable hot water for large households. With its high output of 25.6kW, it can easily provide hot water to multiple fixtures simultaneously, such as showers, washing machines, and dishwashers.
The unit features a sleek and modern design, with a digital display that allows users to easily adjust the temperature to their desired level. The WiseWater Water Heater also has advanced safety features, including overheating protection and dry burning protection, ensuring that the unit is safe to use.
This water heater is constructed from high-quality materials, including a durable stainless steel housing and a copper heating element, which provides superior performance and longevity. The unit is also easy to install, with a compact and lightweight design that can fit in small spaces.
Overall, the WiseWater Water Heater 25.6kW Hot Water Heater is an excellent choice for large households in need of a powerful and reliable source of hot water. With its advanced features, efficient performance, and durable construction, this water heater is a solid investment that can provide years of hassle-free hot water.
Type of Tankless water heaters
There are two main types of tankless water heaters, the electric and gas tankless water heaters. There is no definite answer to the question which is the best.
Both these choices are great since both have their own strengths. Remember each person has his/her specific needs, what is perfect for your friend may not work well when it comes to meeting your needs.
Therefore, this reason, the choice of the type will depend on the specific demands on hot water, installation, budget, and personal preference.
The below comparison chart will give you an idea of which model will work for you.
Gas Tankless Water Heater
Electric Tankless Water Heater
Achieve 80 to 85 percent efficiency
Better efficiency of up to 98-99 percent
Low gas price
The electricity is a bit expensive, thus higher operating cost
Hot Water Needs
Ability of delivering eight GPM of hot water
Delivers over 8 GPM of hot water
Needs to be inspected by a licensed technician
Warranty and Service Life
Gas tankless water heaters are designed to last 20 years
Simple design allows them to exceed a 20-year lifespan
Tends to emit greenhouse gases into the atmosphere
Extremely energy efficient, usually reaching 98 to 99 percent
Expensive as it can run over $1,000
Affordable with a quality model going for a price of $500
Shopping Guide for Best Tankless Water Heaters
Selecting the right tankless water heater is not rocket science. However, without the right information it is not easy for you to pick the most appropriate choice.
Before we can look at the considerations that you need to have at the back of your mind when making the purchase, let us share some of the benefits that come with this innovative equipment.
When compared to the traditional water heaters that occupy a lot of space, you will find the tankless models handy. These models require little space allowing them to fit in most places in your house. This makes it easy to install in small areas such as your bathroom, kitchen, and cabin.
The main reason why many individuals are considering installing these units in their home is that they utilize the energy better than traditional water heaters. With the ability to utilize heat energy of about 85-99 percent, you can expect your water to be heated faster.
While comparing with the tank heaters that barely crosses 65 percent efficiency, you can enjoy hot water in your homes without worrying about the energy bill. With the high-efficiency rate, you can expect your gas or electricity bill to reduce by up to 25 percent.
Another reason why you need to consider installing one of the best tankless water heaters is their ability to provide you with continuous water supply. Unlike the traditional water heater that has the tendency of the water dropping after using a full tank, these model give supplies you with water at a constant temperature. This means you do not have to deal with cold jets and extremely hot jets in the showers, which can be uncomfortable.
The tankless water heaters are also Eco-friendly since they are highly efficient and consume energy when there is a need. Unlike the tank water heaters that run 24/7, these models not only help you to reduce your energy bills but also conserving the nature. Some People say Tankless Water Heater is Green. Check it
Considerations When Buying the Right Tankless Water Heater
Well, now that you know some of the benefits of choosing a decent tankless water heater, let us look at the main considerations that you need to bear in mind while purchasing a tankless water heater.
With various models to choose from, it can be the trick for most people to find the ideal balance between the functionality and price. However, considering the following tips will help you in getting exactly what you need.
Heat Output and Flow
Since the tankless water heater only when it is needed, it will minimize wastage of energy. However, this doesn’t mean that all the tankless water heaters are the same.
These models come with different rating depending on the amount of the heat it generates. This is usually indicated in Kilowatts (kW) or British Thermal Units (BTUs). The volume of water delivered in a minute is usually indicated in GPM (gallons per minutes).
It is a no-brainer that a unit with higher numbers in BTUs and GPMs are great for individuals with a large family that requires a constant supply of water.
You should also look at the size of the water heater. Are you looking for a model for a large home or something that fits in a small kitchen or bathroom?
Generally, these units come with a compact design, but you can find models that are sleeker than others are. Most often, the smallest models are ideal for small spaces but do not provide a lot of hot water for multiple uses.
The power of the tankless water heater will depend on the specific use. If you are looking for a model to use in a home with a large family it should be powerful enough offer you with enough water to use in several bathrooms.
Besides, it should have the ability of supplying hot water to the kitchen sink and dishwasher.
A quality tankless water heater is expected to perform efficiently for many years, so it is not surprising to find that these units do not come cheap. However, this doesn’t mean that you have to break your bank to get them.
By doing the extensive research, you can find a model that fits your budget and offer the performance you are looking for.
Installation and Use Factors
As you can see from the above models, we have both electric and gas tankless water heaters. Since the models operate differently, there are different installation requirements.
Installing most of these heaters is simple though you need basic plumbing skills. You also need to follow the basic instruction guide that comes with the unit.
Another thing you should look at when picking the model is the convenience of use. This is often facilitated by the number of features that come with the unit that you select.
Some of the basic features to look at include temperature adjustment, customizing the performance of the unit as well as the ease of use. Basically, the best model should have an intuitive control that allows you to customize the temperature of the unit easily.
Heater for RV
If you are an RVer who enjoy traveling a lot and enjoying outdoor activities such as hiking, rock climbing and biking could enjoy taking a refreshing shower after spending all the day in the outdoors.
Having a six-gallon tank of hot water can be used quickly and may not give you enough water for your needs. However, getting the best tankless water heater will allow you to get continuous hot water whenever you need.
Besides, the tankless water heaters are easy to carry and fit in tight spaces, so you do not have to worry about storage space in the RV.
How We Tested
We believe that our customers deserve the best product to make their lives better. For this reason, we have invested a lot of energy, time, and resources to ensure that you get nothing short of the best.
We start by looking at the best models on the market by looking at the units with the highest ratings on Amazon and other independent sites.
Sometimes our expert also purchases the models, test them, and rate the product according to our findings such as functionality, ease of use, design, and power.
We also consider the customer feedback and satisfaction level to come up with a conclusive list.
A word of caution
Generally, the tankless water heater is better than the traditional water heaters. However, to help you get out of these models, there are some things you need to know. First, the tankless units are pricey, costing up to twice as much as the traditional models.
Besides, since some of the tankless systems run from natural gas there is potential for carbon monoxide leaking. For this reason, you need to have a licensed professional to manually inspect and provide the required maintenance annually to ensure that you are safe.
Before you can settle on the best tankless water heater, you should start by considering the average water you need and balance that with the price. Doing this will help you to enjoy a continuous supply of water in your home to suit your needs.
Besides, although there are other ways that you can reduce water and energy usage in your home, we are sure that investing in any of the above models will surely bring a significant reduction in energy bill while giving the comfort you need. All the best!