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Tankless water heaters are becoming extremely popular as the water heater of choice for any household. Compared to the traditional storage tank heaters, these systems are environmentally friendly, highly energy efficient and take little space. Because they work on demand, they have longer lifespans, lower maintenance and require standby energy.
If you’re looking to upgrade your water heating system at home or need an efficient, stylish and compact system for a new household, a tankless water heater might be the way to go. The trouble, however, is that because tankless heaters have become so popular, you’ll find many companies making them. But not all of them have the quality or construction they should have. This makes it difficult to separate the good from the not so great.
That’s where we come in. We’ve researched through hundreds of models and selected the top 10 best systems out there, based on a variety of factors. In this article, we outline our reviews and guide to the best tankless heaters (gas and electric) on the market.
Rinnai V Series: Outdoor Installation – Hot Water Heater – Gas
- Saves 40% energy as compared to traditional tanks.
- ThermaCirc360 technology that circulates hot water through pipes.
- Compact design saves up space.
- It cuts down Carbon dioxide emissions effectively.
- Uses more amps than the standard 120 amps.
- Heavier than it looks
Promising an endless supply of hot water, Rinnai V Series Hot Water Heater comes in 4 sizes, ideal for small to medium sized homes. The capacity of the models range from hot water at a rate of 5.3 to 9.4 GMP (depending on the temperature of the water) and run on either natural gas or propane. In general, tankless water heaters that run on gas can save up to 40% in energy, making this an excellent option for energy conservation.
The Rinnai V53DeN supports up to 4 fixtures at a time. It uses ThermaCirc360 technology which recirculates hot water through your pipes, so that the water gets to your fixtures quickly, reducing the waste of time and water of waiting for the hot water to get to your faucet. One modern feature of the Rinnai V series is its smart Wi-Fi connectivity. Instead of having to go to the unit any time you want to start or turn off the heater, you can use its Control-R 2.0 Mobile App that lets you set the time as well as schedule.
Additionally, it also lets you put the system into vacation mode. The vacation mode helps to reduce the energy consumption of the unit all the while powering it up just enough so that the pipes do not become dormant and freeze.
The model is easy to install but somewhat heavy to lift. Ensure you have a professional installer to help with the process. Rinnai is known for its excellent customer service and quality products. The company offers its users a residential factory warranty of 10 years on the heat exchanger, a year of labor and 5 years on its parts.
Rinnai V Series Gas – Indoor Installation – Water Heater
- Endless hot water with minimum delay
- Ideal for small and medium houses
- Saves up to 16 square feet of space
- Conserves water
- Specific vent requirements
Best for indoor installation, Rinnai V Series Tankless Hot Water Heater works on either natural gas or propane gas to provide you with an endless supply of on-demand hot water. The V75iP HE unit is the perfect combination if you are looking for high functioning, highly efficient and energy-saving tankless heater.
The heater has a flow rate of 7.5 GPM so that you always have good water pressure. In general, this tankless water heater is perfect for you if you have a small or a medium house, but it also comes in a few different sizes, so choose the right size depending on your water usage.
Like the Rinnai V Series outdoor installation, this indoor installation also uses ThermaCirc360 Technology that makes sure hot water reaches you quickly by keeping the water circulating in pipes so that the water reaches you whenever you turn the faucet.
When installing a tankless water heater inside, the size of the unit becomes more important than it is for outdoor installation. The Rinnai V series indoor tankless heaters have been designed to be compact, making it possible to install them in tight quarters like the attic or crawl spaces. They have a life expectancy of 20 years and because the parts of the heater are replaceable, you can easily swap out components without needing to replace the entire system.
Marey Indoor Propane or Natural Gas Water Heater
- Rustproof construction
- Quick and easy installation
- Provides 3.1 gallons of water per minute
- Does not require an electric outlet
- It has an energy-saving efficiency of 87%
- The battery compartment has a below-average design
The Marey Tankless Water Heater is a clean and compact unit that can be installed almost anywhere indoors (note that it’s for indoor installation only). The system provides you with an endless supply of water whenever you want. In addition to saving up to 60% of your electricity bill if you had a tank storage heater, it also saves spaces and energy. It runs on natural or propane gas, with a GPM of 3.1.
In addition to this, the unit requires no electrical connections which make it an ideal heater for places that suffer from frequent power outages. Thus, the brand makes sure that you never have to give up hot water even during times of power fluctuations.
Another benefit of the Marey heater is that it allows you to control the water temperature and to customize it to suit the requirements of your household. This enhances energy savings. Additionally, the device has been engineered with precision so that it remains resistant to rust as well as mildew. One of the best things about this product is that it works just as fine with low levels of water pressure.
Installation is easy but while some have done it as a DIY project, it’s best to seek the help of a professional to ensure that there are no leaks or issues with the installation process. Note that the set doesn’t include exhaust/vent pipes, which you will have to source yourself.
GASFLEX Excel Pro Gas Tankless Water Heater
- Clear LCD display panel
- Provides as much as 6.6 gallons of water per minute
- Possesses a power venter fan.
- Durable and sturdy construction
- Easy installation
- Slow start with low water pressure
- Non-standard gas fitting
The Excel Pro Tankless Water Heaters is a compact and powerful unit that works using natural gas. Although small, the Excel Pro is equivalent to a storage tank heater in function and can do anything that a 40-gallon tank can do.
The Excel Pro works well with most types of existing venting, unlike some of the other models listed here. This, combined with its more affordable price, reduces the initial purchase and installation costs of your tankless heater.
Possessing Modulating Technology, the tankless water heater can be set to two different heating capabilities according to your requirements. It supports a full-on/ full-off setting or the modulating setting, which changes the heat input according to the flow rate of water. This adds to the energy saving capabilities of the model.
The unit has a European design with an easy to understand and use LCD interface. The display is in a digital form but indicates the temperature in Celsius, which can be confusing if you’re not used to it. Furthermore, with its gas input of 140,000 BTU per hour, the device works as productively as possible to meet all your hot water requirements without any delay. The heater delivers steaming water at a flow rate of 6.6 GPM. The unit has been manufactured specially to accommodate people living in small to medium-sized apartments.
CAMPLUX Portable Gas Tankless Water Heater
- Electronic ignition system
- Works perfectly with low water pressure (3.0 PSI)
- Extra safety precautions to ensure safe operation on the unit
- Compatible with modified water systems
- Easy installation on range of surfaces
- The unit does not have an auto-cutoff.
- The top vent only has a grating which can damage the unit during rain
- Not suitable for drinking water
- Not recommended for elevations over 2000 ft
The CAMPLUX Tankless Water Heater stands out with its portable and outdoor-installation design. This makes the Camplux an excellent option for campers, motorhome owners and those who do not have the space for an indoor heater. It can also be mounted indoors but would require a flue pipe to be installed as well.
The Camplux runs on gas but the company has made sure it isn’t a safety hazard. The unit contains anti-freezing protection, a flame failure device and an overheating sensor that ensures the device is under control and causes no danger for you or your family. To eliminate the possibility of the water reaching a scalding hot temperature, the high-temperature water protection sensor turns the water off once it reaches 167 degrees Fahrenheit. All these features enhance the safety of the Camplux, especially for cabins or campervans.
Moreover, the device also has a drain plug that removes excess water, so it doesn’t freeze in very cold temperatures. With maximum power output of 68,000 BTU per hour, the heater provides hot water at a flow rate of 2.11 GPM. The unit’s lightweight yet sturdy construction enhances its ease of use and durability. Additionally, the device comes with an installation hardware pack that helps you to install it on a variety of surfaces.
One thing to note is that the Camplux should be installed in a well-ventilated area. While this would mean most outside locations, take care when installing indoors. Overall, the Camplux tankless heater has been engineered with precision to save you money and energy, while giving you a never-ending supply of hot water anytime and anywhere you want it.
GASLAND Portable Outdoor Tankless Water Heater
- Saves up to 11.5% energy
- Easy installation with clear instructions
- Compact, lightweight and portable heater
- Ideal for campers, RVs and cabins
- Affordable price
- Requires rain protection
- Not suitable for indoor installation
- Not suitable for drinking water
One of the most affordable units on this list, the Gasland Tankless Water Heater is another lightweight, portable unit that suits a variety of functions. It runs only on liquid propane so ensure you have the right type of fuel for the unit.
The Gasland heater has a variety of protective features, including flame failure device, overheating protection, and anti-freezing protection. In case of an unexpected flameout, the device automatically cuts off the gas supply. Furthermore, it heats the water to a maximum of 167 degrees Fahrenheit and not more. These factors ensure that the unit can be used safely anywhere.
The Gasland allows a maximum power output of 41000 BTU per hour and works extremely well even at low water pressure (2.5 PSI or above). The unit supplies 1.58 gallons of water per minute instantly. Moreover, you can adjust the heat as well as the water flow of the system according to your needs.
Since the device is compact and lightweight, it can easily be transported from one place to another without any additional exertion and can be installed in a matter of minutes. Whether you are going camping or swimming, you can put this small unit into your car and get a supply of hot water anywhere at any time, be it at the beach, while camping or for our general RV life.
EcoSmart Electric Tankless Water Heater
7 used from $164.13
- Patented self-modulating technology to save energy
- Displays water temperature on a digitized display screen.
- 2 gallons of water per minute
- High energy efficiency
- Lifetime warranty for domestic usage
- It can cause leaks if not maintained properly
- Best for small spaces only
One of the most effective whole home models on the market, the EcoSmart gives you perfect balance of value and efficiency. The unit can heat up to 4 outlets in warm weather and up to 2 outlets in colder climates. Based on the climate you live in, the hot water flow ranges from a low of 1.8 GMP (cold climates) to a maximum of 4.4 GMP (warm climates). This makes it oe of the best models for cold weather.
The unit has a compact yet sturdy design that takes up little space, perfect for indoor installation in tighter spaces and a clear a digital display of the temperature. The EcoSmart promises up to 50% savings on your utility bills with a 99.8% energy efficiency. The highly advanced patented self-modulating technology of the unit works to make its operation as efficient as possible. The way this works is by adjusting the amount of energy to suit the amount of water being heated.
The model itself is of sturdy construction with a long lifespan. To make things as convenient for you as possible, EcoSmart is made with high-quality parts that can last for a very long time, but if any part gets broken or damaged, it can easily be replaced. Additionally, it’s worth noting that EcoSmart is one of the only electric tankless water heaters that offer a lifetime warranty.
Stiebel Eltron Electric Tankless Water Heater
1 used from $419.78
- Advanced flow control maintains water temperature
- Offers noise-less operation
- Compact, space-saving design
- Preset temperature memory buttons
- Uses 15-20% less energy
- Stylish white exterior
- German manufacture
- Hot water can be slow to get to tap
When it comes to electric tankless water heaters, Stiebel Eltron knows their stuff. After all, the company invented the tankless electric heating technology over 90 years ago and remains one of the most popular brands today. The Tempra is one of their best and most popular models.
The Tempra is an excellent whole house heater, with a compact, sleek yet strong in design. The unit itself is about the size of a large briefcase, and easily fits on any wall space in your home, yes is very powerful. The system runs completely silently and requires no ventilation. This makes installation quite straightforward and less costly.
One of the best things about the Tempra is that it works consistently, even with peak usage by controlling the flow of water using its Advanced Flow Control German Patented Technology. If hot water demand is high, the system automatically reduces water flow slightly to maintain the temperature. Although your water pressure may drop somewhat, the hot water continues at a consistent temperature.
The Tempra is extremely energy efficient (up to 99%) and will only use the minimum amount of energy that it needs to work efficiently. It also has auto-modulation technology which keeps the energy consumption in check. You’ll save a minimum of 15% to 20% on your hot water heating bills compared to traditional tank storage heaters.
Bosch Electric Tankless Point of Use Water Heater
- Point of use tankless heater
- Has a dual-chambered Copper Heat Exchanger
- Thermal efficiency of 98%
- Dual orientation and easy mounting
- A small and lightweight unit that can fit into any space conveniently
- Only services a single point
- Can only be installed on cold water line
- No thermostat
The Bosch Tankless Water heater is highly compact and affordable but note that it’s a point of use heater and not a whole house system. If you need hot water at a specific outlet or to work in conjunction with your primary water heater, this is the model for you.
Thanks to its small and lightweight size, the unit can not only be mounted vertically but also horizontally. It’s perfect for small spaces and because it doesn’t require ventilation fits just about anywhere, for example mounted under your sink or even in one of your cabinets. It’s also excellent for use in RVs, boats or cabins. Have an intricate and attractive design, the unit will blend in with any color theme and its small size means that it’ll likely be unnoticeable.
In terms of construction, the unit is made of top-notch materials that has excellent durability and a long lifespan. When it comes to its efficiency, the heater promises to provide hot water with an efficiency of 98%, which translates to reduced utility bills.
The product is backed by a limited 1-year warranty on the many parts of the heaters whereas the company offers a 5-year warranty on the heating element.
Rheem Electric Residential Tankless Water Heater
1 used from $262.58
- External digital thermostatic control
- High flow rate
- Easy installation
- Compact, space-saving design
- Durable long-lasting copper heating elements
- Advanced self-modulation technology
- Excellent customer service
- May get overwhelmed at peak usage
The Rheem electric tankless water heater is an excellent solution for a whole house water heating system. Whether you simply require a single point-of-use device or a system for multiple outlets, the Rheem water heater will suit either application.
The system has an excellent GPM that reaches up to 5.9 if using for the whole house. This ensures consistent hot water and a reliable flow. With up to 99.8% of energy efficiency, the Rheem makes the most of its energy usage with no waste.
The design of the unit itself is compact, clean and quite stylish, with a clear digital display. The unit allows you to control the temperature between 80oF to 140oF according to your preferences. This also lets you maximize on energy efficiency. Additionally, the unit has its own self-modulation which adjusts the power according to the hot water usage.
In terms of construction, the Rheem comes with durable copper immersion heating elements which have a long lifespan. In the case of any fault, these can be easily replaced. Overall, the Rheem is sturdy and durable, easily installed and maintained. The company has excellent customer service which makes dealing with them much more pleasant and easy.
What’s a Tankless Water Heater?
If you’re considering installing or upgrading your water heater system at home, consider a tankless heater because of the many benefits they offer as opposed to the traditional tank storage water heaters.
Tankless water heaters are work on an on-demand basis, heating up your water as it goes through the high-powered burners or elements of the system. As the cold water goes through the unit, it emerges as hot water and is then dispensed to the water outlets as you turn your tap on. When you turn the tap off, the process stops and enters standby mode. Naturally, this method of heating water is extremely energy efficient and provides an endless hot water supply.
Tankless water heaters can be powered by electricity or natural/propane gas. While they can be expensive to purchase and install, they have much longer lifespans than other types of water heaters. These heaters are also small and compact, generally easily mounted onto a wall space.
Pros and Cons of Tankless Water Heaters
To know whether a tankless water heater is the best option for you, let’s take a look at the pros and cons.
Tankless Water Heater Pros
- Energy Efficiency – Tankless heaters are highly energy efficient, with some models having up to 99.8% energy efficiency. According to Energy.gov, tankless water heaters can be up to 34% more energy efficient for households that use less than 41 gallons of water, and up to 14% more for larger households that use around 86% gallons of water per day.
- Saves Money – This is somewhat tricky because the difference in savings between a gas tankless heater and a gas storage tank heater is around $7 a month. While this does constitute some savings, note that it’s not hugely significant.
- Long Lifespan – Tankless heaters have a very long lifespan, and typically last between 20-30 years. However, note that hard water can negatively impact a tankless heater, causing damage to the system.
- Minimal Space Required – One of the most important aspects of tankless heater systems is that they’re so small and compact and easily fit into any sized homes. These devices are wall-mounted with a typical sized model the size of a large briefcase. This makes tankless heaters ideal for smaller homes where space is restricted.
- Endless Hot Water – Possibly the most important feature of tankless water heaters, these systems can provide hot water endlessly. Because they work on demand, heating only the water that’s being used, you’ll never run out of hot water. However, you may have inconsistent water temperature during peak usage.
- Venting – If you don’t want to worry about ventilation, you can simply have your tankless heater installed outside. Alternatively, if you’re opting for an electric tankless heater, you can choose to install it either inside or outside as these don’t require venting in either case. This saves you money and effort in creating ventilation for the unit.
- Sustainable – Considering that these units last longer, use less energy and are smaller in size, they are highly sustainable systems.
- Portability – Some tankless water heaters give you the option of portability, and are ideal for RVs, cabins and mobile homes. These models come with a range of safety features and easily attach to a variety of surfaces, giving you hot water anywhere you need it.
- Higher Home Value – While this varies depending on many variables, including location, type of home and so on, in general, installing a tankless water heater system can increase a home’s value by up to 4%. What’s more, a 2016 analysis found that homes with tankless heaters stayed on the market for a shorter time compared to homes without.
Tankless Water Heater Cons
- Cost – Tankless heaters range in price but are typically more expensive to purchase. Gas models tend to cost more than electric ones but are more economical to operate in the long run. Additionally, installation costs are also very high. Together, the average purchase and installation cost of a tankless heater comes to around $2000. If you’re budget is restricted, you might want to purchase a storage water heater which only costs around $500 to $800.
- Expensive Retro-Fitting – If you already have a tank storage heater and want to upgrade it to a tankless, you may find that the retrofitting costs quite a bit. Labor costs can be high and the project can take a while. Also, unless you’re at the end of your current heater’s life, it doesn’t make economic sense to switch to a tankless.
- Overwhelmed System – Tankless water heaters can support from 1 to 4 or more fixtures, depending on the size. However, if the system is overwhelmed with high demand, and can’t keep up with the water being used, you may experience cool water coming through. Note that this only happens if you’ve exceeded your heater’s GPM.
Tank Storage Water Heaters vs. Tankless Water Heaters
Tank storage water heaters have been the most popular way to heat water, with most homes having this type of heater. These models haven’t changed much since they were invented.
These systems consist of a large tank, usually between 30 to 50 gallons. Once the tank is filled up, the system works to heat the water up and maintains the heat until you use it. This way, you always have a tankful of hot water ready to go.
Naturally, there are several benefits to this system. For one thing, you’ll always have a large tank of hot water, the equivalent of about 3 showers. Even if you open all the outlets in your home, you’ll get consistent hot water until the tank is empty. However, once the tank empties, it takes a long time for it to heat up again. Unlike tankless heaters, which only heat the portion of water running through the system at any given time, tank heaters have to heat up dozens of gallons at a time. This also makes the system less energy efficient than tankless because in addition to heating up the entire tank, the system has to maintain the heat on standby.
Another benefit of the tank storage heaters is that they’re much less expensive to purchase and install, typically costing around $500 to $800. Because they’re less complicated systems, the maintenance is also a lot easier and cheaper. However, they have shorter lifespans and last only around 8 to 10 years. Additionally, they can get damaged faster if the quality of your water is low. In comparison, tankless heaters can last twice as long.
One of the main issues with tank storage heaters is that they are large. These behemoth systems take up a significant amount of space in your home. If you live in a small apartment, it can be very hard to accommodate a tank heater.
In general, you could argue that tankless water heaters are superior to tank storage heaters in every way except price. So if budget is your main concern, you may want to consider buying a tank storage heater instead.
How Does a Tankless Water Heater Work?
Tankless water heaters work on demand, heating water without a storage tank. The way they work is quite simple.
When a hot water faucet is turned on, water begins to travel through a pipe and passes through the heating system. As it travels through the heater, an electric element or a gas burner heats up the water traveling through. By the time the water leaves the unit, it has become hot.
This system means that you never run out of hot water as the unit can work constantly and provides hot water endlessly. A typical tankless heater can heat up about 2 to 5 gallons of water per minute.
However, the flow rate of the water is directly connected to the temperature of your location. If you live in cold climates, which means you need a high temperature rise for your water, the water flow will slow down. This will limit the number of fixtures you can heat up at a time. The opposite is true if you live in a warmer climate. So when you buy a tankless system, you have to consider the climate you live in as this will impact the flow of hot water.
Gas vs. Electric Tankless Heaters
One of the first decisions you have to make when buying a tankless system is whether you should purchase an electric or gas heater. Here’s a look at the differences:
Gas Tankless Water Heaters: A natural gas or propane tankless water heater is typically more expensive than an electric one. They typically cost around $1000 to purchase. Additionally, gas heaters are more complicated to install because they have very specific venting and combustion air supply requirements. Existing venting systems may not be suitable because of the gas heaters high gas consumption. All this makes installation expensive (note that you can install your unit outside which bypasses the venting requirements). Another point to note is that gas prices tend to fluctuate, and experts estimate a potential increase in prices in the future.
There are two types of gas tankless heaters, depending on how they operate. These are categorized based on how they use the condensation in the unit. As the fuel heats up the water in the unit, it creates steam or water vapor as a by-product.
- Non-condensing water heater – these units will vent the hot vapor created from the unit, sending them out to cool through heat and corrosion resistant channels. In other words, this heated vapor isn’t put to any use, which reduces energy efficiency. These units are cheaper to buy and have lower maintenance but require complex venting systems. They take up less space too but have a lower energy efficiency rating.
- Condensing water heater – these units recycle the extra condensation, using the heat in the water heating process. It only sends out the condensation once it’s cooled, reducing need for expensive venting systems and using up more of the energy. These units have a higher initial price but are cheaper to operate with excellent energy efficiency of up to 98%. They also require regular maintenance.
Rinnai RUR98iN Condensing Indoor Gas Heater. Check Price Here.
Electric Tankless Water Heaters: Electric heaters are noticeably less expensive than a gas tankless heater. A typical model costs around $500 to $700. However, electric models are typically smaller than their gas counterparts, don’t need any ventilation and can easily be mounted anywhere you wish, making installation less complex and therefore cheaper. Additionally, these models can be more efficient to operate at around 98% efficiency, with some models, like the EcoSmart Eco 11, boasting a 99.8% energy efficiency. Electricity is generally stable in price and experts estimate that this will continue into the future.
Here’s a quick recap of gas vs. electric tankless water heaters:
- Gas heaters are more expensive than electric heaters.
- Electric heaters have higher energy efficiency.
- Electric heaters are smaller than gas heaters.
- Both can be mounted inside or outside.
- Electric heaters don’t need any ventilation, whereas gas heaters installed inside do.
- Electric heaters are cheaper to maintain and only require cleaning of the inlet screen filter. Gas heaters require more safety checks.
- Electric heaters have a lower chance of combusting and give owners peace of mind.
- Gas heaters are less sustainable as they contribute to greenhouse gas emissions.
- Electric heaters can be installed closer to the point of use (because they’re smaller and don’t need venting), reducing lag time between turning on the faucet and getting hot water.
- Cost of gas can be high depending on the region whereas electricity costs are generally the same across the board.
- Gas models can be more reliable in the long term.
Some Things to Consider When Purchasing
Now that we’ve discussed the specifications and workings of tankless water heaters, let’s take a look at what you need to consider when purchasing one.
- Gas vs. Electric Heaters – We’ve already discussed this above in detail so there’s no need to repeat it here. The consideration you’ll have to make is whether you want a gas or an electric heater. This would depend on a variety of factors, such as budget, installation location and energy supply.
- Ventilation – Gas water heaters need ventilation, which can be complex and expensive to install. Consider whether the structure of your house accommodates such ventilation and how much this would cost you. The easiest way to avoid ventilation is to opt for an electric model which doesn’t need it.
- Energy Efficiency – Some models are more energy efficient than others, with condensing gas tankless heaters and electric heaters being among the most efficient types. Check the energy specifications for each unit as this varies.
- Size – Tankless heaters come in a range of sizes, to suit small to medium and large households. These are categorized according to their hot water flow rate, or gallons per minute (GPM). Consider how much water you use and how many fixtures your household would need in peak usage. You’ll see that there are extensive GPM information based on temperature on most tankless water heater listings.
- Cost of unit – Tankless water heaters range in price, with electric units being less expensive than gas units. The size of the unit will also have an impact on its purchase price.
- Climate – The climate is important because it has a direct correlation to the hot water flow of the unit. The GPM of tankless units drop during cold weather and increases in warm weather, as less heating is required.
- Installation cost – The final installation cost will depend on a variety of factors and will vary based on your specific situation. If you’re retrofitting a storage tank heater to a tankless heater, the costs can be even more significant. Overall, the average installation costs for tankless heaters is around $2000.
- Warranty and fine print – This is often overlooked but is extremely important. Most negative reviews on tankless heaters are related to this so read carefully and check what the company offers you.
Tankless water heaters are becoming increasingly popular, especially as societies become more sustainable and conscious of the environment. Tankless water heaters are sustainable units with a long lifespan, and they save you money on your utility bills throughout.
The most important thing is to choose the right unit to suit your home. Your entire tankless water heater experience can go sour if you pick the wrong size for your home or mess-up during installation, for example. This is why it’s important to do you research, make your calculations and choose the unit that meets your needs.
Our list of the best tankless water heaters will hopefully help you to filter down your choices and to pick from among the best.
If you want to learn more about tankless water heaters, check out our FAQs here.
Interested in a storage tank water heater instead? Read our reviews here.