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The 12 Best Tankless Water Heaters of 2019

Tankless Water Heaters: The Best of 2019

The Stiebel Eltron Tempra 36 Plus Electric Tankless Whole House Water Heater is best known for its stunning design and functionality. Its large capacity and high levels of output make it a perfect choice for large households and businesses that constantly face a high demand for hot water. So, if your current water heater doesn’t meet your high water demands, probably you should consider installing a Stiebel Eltron Tempra 36 Plus tankless water heater. This unit weighs 22.9 pounds and measures 4.6 x 16.6 x 14.5 inches. This means that the heater is quite compact and won’t occupy a lot of space in your small house or business.

The unit also comes with a coated steel encase to guarantee its strength and ensure no venting is required. Consequently, you can safely install this water heater indoors without worrying about leakage. This tankless water heater is fitted with a reliable energy consumption mechanism that reduces consumption by 20 percent. Its on-demand water heating process also minimizes heat loss and improves energy efficiency. Additionally, this device comes with an advanced temperature control system that adds to its great performance.

Thanks to its simple setup, the Stiebel Eltron Tempra 36 Plus electric tankless water heater is easy to install. But for you to enjoy its long warranty, you have to involve a professional installation expert. Furthermore, this unit comes with three heating modules that make it the ideal heater for large households. The only problem with this tankless water heater is that it might be a bit expensive for small households and businesses. It also requires a 3x60 AMP breaker.

Key Features
  • Improved flow control
  • Auto-modulation
  • Digital temperature control
Specifications
  • Manufacturer: Stiebel Eltron
  • Warranty: Three-year limited
Pros
  • Digital temperature control
  • Proven reliability
  • No venting needed
  • Sleek design
  • Energy efficient
  • Fits anywhere
  • Doesn't run out of hot water
Cons
  • Energy consumption depends on how long people stay in the shower
  • Extra payment for professional installation

If your water heater is giving you problems, perhaps it’s time to get a replacement. It goes without saying that your replacement has to be better than the current heater. The ongoing technological advancement has completely transformed the customary water heaters and the market is now filled with tankless water heaters that have proved to be better options than their traditional counterparts. One of these new creations is the Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater. This is a gas-powered indoor water heater that is ideal for both commercial and household use.

This tankless water heater weighs 61.7 pounds and measures 26 inches tall and 10 inches wide. It comes with a control panel that has a digital display as well as gas and water controls. What is most appealing about this water heater is the fact that it allows you to lock the temperature at the click of the button. With 95 percent energy efficiency, the Rinnai RUC98IN tankless water heater ranks among the top most energy efficient heaters on the market. Therefore, you are guaranteed to drastically reduce your electricity bills when you install this unit.

This heater also comes in a compact design that allows you to install it in your house or business without worrying about the available space. It is also one of the few tankless water heaters with the highest level of output. Since this heater doesn’t keep the water in its system for a long period of time, there is reduced risk of water contamination. The only hitch you are likely to experience with this unit is the slight delay in water heating and a minor drop in temperature when the unit is serving two outlets simultaneously.

Key Features
  • 95% Thermal Efficiency Natural gas
  • Concentric and PVC venting options
  • Only 98° F to 140° F Residential Temperature Range
  • Compatible with all Rinnai Digital Controllers
  • Meets all California and Texas NOx Emissions standards
  • 15,200 - 199,000 Electronic Ignition
Specifications
  • Flow Rate: 9.8 GPM
  • Manufacturer: Rinnai
  • Warranty: Limited 12-year on heat exchanger, 5-year on parts, 1-year on labor (5-year optional on labor) Commercial: Limited 5-year on heat exchanger, 5-year on parts, 1-year on labor
Pros
  • Improved energy efficiency
  • Minimal NOx emissions
  • 199,000 maximum BTU
  • Space-saving design
Cons
  • Some complaints that it takes awhile to get hot water from taps
  • Temperature can drop if hot water is running from two different outlets

This Eccotemp FVI12-LP Liquid Propane Gas Tankless Water Heater boasts a flow rate of up to 3.4 gallons per minute, which makes it an ideal choice for most residential water needs. This means that the Eccotemp FVI12-LP tankless water heater can supply water to two flow-restricted showerheads simultaneously. Additionally, this heating system has a digital LED display that shows temperature levels and error messages. It also has two knobs for regulating water and gas flow. This unit is one of the easiest tankless water heaters to install. Since it does not have a storage tank, this heater will definitely save you energy because it doesn’t have standby losses.

It is a simple, but very reliable water heater with superior performance. Once the two knobs have been set to match your water heating preferences, the unit works consistently well. Unlike the digital heaters, which break down so easily, this unit is built to last for a long time with minimal repairs. It is also very easy to install and operate. You can actually install it anywhere in the house. However, it is advisable to hire an expert to install it for you. Additionally, the Eccotemp FVI12-LP is one of the most affordable tankless water heaters on the market today.

This heating system is highly energy efficient as it only needs 74,500 BTUs to heat 3.4 gallons of water per minute. You can actually cut down your monthly electricity bills by up to 50 percent. However, this unit is operated manually, which some people find tedious. It is also not fit for households with low water pressure.

Key Features
  • Compact size
  • Gas and water knobs
  • Safe electronic ignition system
  • Temperature controls
Specifications
  • Flow Rate: 3.6 GPM
  • Manufacturer: Eccotemp
  • Warranty: Two years
Pros
  • Serves one shower and one low-rated outlet instantaneously
  • Easy installation and operation
  • Efficient energy usage
Cons
  • Not good for households with low water pressure

If you are looking for a tankless water heater that will can perform optimally with more than one outlet, then this Takagi T-KJr2-IN-LP indoor tankless water heater is a good choice for you. For example, if you want to use the washing machine while washing the dishes, this Takagi T-KJr-IN-LP is designed to allow you to perform the two tasks simultaneously without a hitch. Furthermore, it comes in a compact shape and size. It weighs 37 pounds and measures 6.7 x 13.8 x 20.3 inches. This means that you can install it in limited spaces without a problem. With 140,000 BTU, this unit will help you to drastically lower your electricity bill.

This Takagi tankless water heater offers a flow rate of 6.6 GPM at a temperature of 35F and 3.3 GPM at a temperature of 70F. Therefore, it is able to minimize the chances of burning. For safety purposes, the venting system comes with a category 3 stainless steel coating. Additionally, the system is also fitted with overheat, freeze and surge protection capabilities. While this heater is easy to install, it is advisable to involve an expert in the installation process. Its 10-year heat exchange warranty is a clear testament to the fact that the manufacturer is confident of the quality of the heater.

The only problem with this water heating device is that you are likely to wait for about 7 seconds before it produces hot water. You will also need to pay a professional installer to install the unit for you.

Key Features
  • 4-Inch category III stainless steel
  • Freeze, overheat, and surge protection
  • Troubleshooting diagnostic codes
  • AC 120V
  • Direct Vent
Specifications
  • Flow Rate: 6.6 GPM
  • Manufacturer: Takagi
  • Warranty: 10 year heat exchanger and 5 year parts
Pros
  • 140,000 maximum BTUs
  • Low Nox Emissions
  • Stainless steel
  • Easy to install
Cons
  • Venting required
  • Suitable only for light residential

The Rinnai RUC98iP Ultra Series Propane Tankless Water Heater is a legendary product from the famous Rinnai brand. This tankless heating system uses propane gas and gives you the freedom to install either the PVC or the concentric option. These features make the unit quite versatile in its installation and application. The RUC98iP model utilizes up to 199,000 BTUs and has an adjustable power input. Therefore, it is able to offer you the right temperatures and flow rates. Normally, it provides a flow rate of 9.8 gallons per minute, which makes it a reliable source of hot water for homes and businesses.

It is also worth noting that this tankless water heater has an energy efficiency factor of about 96 percent. This means that you are going to notice a drastic fall in your monthly electricity bills once you install this unit. And if you are mindful of environmental degradation, this tankless heater has ultra-low NOx Emissions. Additionally, this unit is very easy to install thanks to its compact and uncomplicated design. It measures 10 x 18.5 x 26 inches and weighs 82 pounds. So, you can install it anywhere without worrying about the available space.

When it comes to warranty, this water heater comes with a 12-year warranty on the heat exchange. This shows that the manufacturer has full confidence in the product. The only downside with this unit is that it can be a bit expensive for small households. It is also most suitable for indoor installation.

Key Features
  • Concentric and PVC venting
  • Space-saving design
  • Propane, gas connection
  • 3/4" MNPT water connection
Specifications
  • Flow Rate: 9.8 GPM
  • Manufacturer: Rinnai
  • Warranty: \Limited 12-year on heat exchanger, 5-year on parts, 1-year on labor (5-year optional on labor) Commercial: Limited 5-year on heat exchanger, 5-year on parts, 1-year on labo
Pros
  • 199,000 max BTU
  • Ultra low NOx emissions
  • Space-saving design
  • Up to .96 Energy Factor
  • No fabrics
Cons
  • Venting required
  • Requires professional installation

With the little space available at home and in business premises nowadays, tank water heaters are quickly becoming irrelevant. People are now going for the compact and more convenient tankless water heaters. So, if your old heating system is giving you problems, then you should consider install a tankless heater. One of the most popular tankless water heaters today is the Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater. One of the reasons why most people are going for this unit is because it is very energy efficient. It has been proven to be at least 95 percent energy efficient.

This heater is designed in such a way that it uses small amounts of gas to heat large amounts of water. Thus, it becomes quite easy for you to fulfill the water needs of your family or business. In addition, this water heater comes with a highly advanced intelligent control system that makes the unit more energy efficient. Plus, it has a built-in blower with a digital LED display. Therefore, you can easily adjust the temperatures. The device also comes with a remote control in order to give you superior control.

The Rheem RTGH-95DVLN tankless water heater measures 18.5 x 9.8 x 27.5 inches and weighs 79 pounds. It also comes with a 3-inch pipe. This means that the unit can easily be installed anywhere without worrying about space. Its only drawback is the fact that it requires professional installation, which comes with an additional cost.

Key Features
  • Intelligent electronic controls
  • Up to 38-Feet of 3-Inch PVC Pipe or 5-Feet of 2-Inch PVC Pipe
  • Stainless-steel condensing heat exchanger
Specifications
  • Flow Rate: 0.40 GPM
  • Manufacturer: Rheem
  • Warranty: 10-Year limited heat exchanger, 1-year limited parts
Pros
  • 94 percent energy efficient
  • Stainless-steel condensing heat exchanger
  • Intelligent electronic controls
  • Low Nox Version
Cons
  • Payment for professional installation
  • Venting required

Are you in need of a reliable tankless water heater for your small apartment? If so, then you should consider installing this Atmor AT-D18TP-AZ Instant Tankless Water Heater. Although it is fairly new, this heater has captured the hearts of many people with its amazingly affordable price and high-quality. Its flow rate is 3.7 GPM, which means that it can supply hot water to two outlets simultaneously. In addition, the Atmor AT-D18TP-AZ comes with a smart flow technology and a self-modulating mechanism. These technologies help to keep the unit’s thermal efficiency at its highest.

The smart flow technology ensures that the heater is turned on only when hot water is needed while the self-modulating mechanism controls the flow of water and the amount of energy consumed during heating. In fact, this tankless water heater promises to reduce your electricity bills by up to 50 percent. This unit comes in a rather compact size of approximately 17.4 x 5.2 x 13.4 inches. Since it doesn’t require venting, this heater can be installed both indoors and outdoors. Courtesy of its sleek digital display and a one-knob design, this water heater is very easy to use and adjust.

It also comes with an IP54 certification, which proves that the unit is splash proof. Therefore, it can be installed near the kitchen or bathtub without being affected by water splashed onto it. The main setback with this unit is that it is more effective in warm climates. It is also not ideal for large households.

Key Features
  • Water sensor
  • Digital thermostat
  • Single-phase DP breakers
  • Stainless steel interior
Specifications
  • Flow Rate: 3.7 GPM
  • Manufacturer: Atmor
  • Warranty: One-year warranty on parts
Pros
  • Easy to use
  • Digital temperature controls
  • Self-modulating technology
  • Energy efficient
Cons
  • Not for big households

This Noritz NRC661-DV-NG Indoor Condensing Direct Tankless Hot Water Heater is powered by natural gas, which means that proper venting is required. Another notable thing about this tankless water tank is the fact that it does not generate any noise when in use. Therefore, you can enjoy your hot shower without the annoying noise. Additionally, this water heater is very easy to install. In fact, it takes less than an hour to set it up and connect all parts. However, you need to be conversant with the whole installation process otherwise you should hire a skilled installation expert to do it for you.

Unlike other contemporary tankless water heaters, which have issues of seepage and restarting, the Noritz NRC661-DV-NG water heater is known to run smoothly with no fluctuations. And so, you can enjoy your shower in peace knowing that you will have constant flow of hot water throughout. Speaking of endless water flow, this heating system has a flow rate of 6.6 GPM. When it comes to energy consumption, this unit is known to offer high efficiency as it runs 120,000 BTUs. Its thermal efficiency goes up to 93 percent. As a condensing heater, this unit utilizes all the natural gases without wastage.

On top of that, this device comes with a remote control to give you better control and has reliable freeze protection. This Noritz tankless water heater comes with a 12-year warranty for the heat exchanger and a 5-year warranty for parts. The problem with this unit is that it experiences the issue of cold water sandwich.

Key Features
  • Low NOx design
  • Remote thermostat
  • 6-inch power cord
  • Scheduled 40/80 PVC
Specifications
  • Flow Rate: 6.6 GPM
  • Manufacturer: Noritz
  • Warranty: 12-Year heat exchanger, 5-year parts, 1-year labor.
Pros
  • Compact shape
  • Freeze protection
  • Two venting options
  • Improved energy efficiency
  • Easy installation
  • Quiet
Cons
  • Delay in releasing hot water

This Marey ECO150 220V/240V-14.6kW Tankless Water Heater is designed to provide you with endless hot water supply for your household and business needs. To help reduce the corrosion caused by hard water, this unit is made of stainless steel. Accordingly, this water heater is expected to last longer than most of the contemporary water heaters on the market. It comes with an LCD panel, which allows you to adjust temperatures and therefore optimize its energy consumption. This Marey ECO150 heater is 98 percent efficient.

With a flow rate of 2.5GPM, this Marey water heater can easily supply water to two showerheads at once. It measures 8.7 x 3.5 x 14.2 inches and weighs 10.1lb. This means that the water heater can easily be installed in small spaces without affecting its performance. Its sleek, compact design is also something worth noting. It is designed to match your kitchen décor.

While you can easily install this tankless water heater by yourself, it is always advisable to involve a qualified installation expert. This not only helps you to set up the system properly, but it also ensures that you qualify for the product’s extensive warranty. The heater is also ETL approved. This gives you peace of mind knowing that your water heating system is of superb quality and is capable of delivering the best results. However, this unit comes with an additional cost of hiring an installation expert. Additionally, it is not the ideal choice for people looking to buy a water heater that can satisfy their high water demands.

Key Features
  • Double pole breaker
  • ETL approved
  • Smart technology
  • LCD panel
  • Flow switch initiation mechanism
Specifications
  • Flow Rate: 5Gpm
  • Manufacturer: Marey
  • Warranty: 5 years
Pros
  • Energy efficient
  • Corrosion resistance
  • Space saver
  • Light weight
  • Compact size
  • Easy to install
Cons
  • For small households only

The Navien NPE-150S Tankless Water Heater is a powerful heater with an advanced condensing technology. This means that the device generates more heat for less energy, which translates to low electricity bills. In fact, the NPE-S series was the winner of 2015 AHR Innovation Award. So, if you are looking for a tankless water heater that has passed the energy efficiency test, then this Navien NPE-150S will do the trick. What’s more, this unit is perfect for both indoor and outdoor installation. But this also means that venting is required. The vent pipes are made of either PVC, CPVC or PP. These ones are cheap to buy and easy to install.

Another important thing about this tankless water heater is that it comes with double stainless steel heat exchangers. Therefore, it enjoys longer life expectancy than most copper heat exchangers and it is corrosion resistant. Furthermore, it enjoys less mineral scaling and deposits. It is known to have low NOx emissions courtesy of its new metal fiber burner. The NPE heater allows easy conversion from natural gas to liquid propane gas and vice versa.

It has a simple integrated water path that reduces water pressure drops, which subsequently makes repairs and maintenance easy. This Navien water heater comes with built-in controls that allow you to adjust temperatures and water flow easily. It also boasts easy wiring for quick installation. You are also going to like its user-friendly interface and its remote control mechanism. The only problem with this unit is that it is not ideal for small households. It also requires professional installation, which comes with additional costs.

Key Features
  • Convertible gas system
  • Ultra condensing mechanism
  • Stainless steel heat exchanger
  • Low NOx emissions
Specifications
  • Flow Rate: 0.5 GPM
  • Manufacturer: Navien
  • Warranty: 15-Year limited warranty on heat exchangers. 5-year limited warranty on parts
Pros
  • Double stainless steel heat exchanges
  • Low NOx emissions
  • Field convertible gas system
  • ½ gas pipe capable up to 24'
  • Cascading capable
Cons
  • Better suited for larger households

The EcoSmart ECO 27 Electric Tankless Water Heater is an energy efficient water heater that best suits small households. This electric heater is self-modulating and provides accurate temperature controls. It also comes with a digital control panel to enable you to regulate the temperatures. Another amazing thing about this tankless water heater is the fact that it can supply hot water to four showers and a sink simultaneously. Therefore, if you are looking for a water heater that will meet the water needs of your busy household, then this EcoSmart ECO 27 tankless water heater is an ideal choice.

As a self-modulating water heater, this unit is able to adjust the amount of energy it uses depending on the amount of water you are heating and the temperature you require. This features helps to reduce the amount of energy used to heat the water. With a maximum flow rate of 6.5 GPM, this unit is indeed a suitable water heating option for people looking to heat large amounts of water at once. This tankless water heater weighs 13.75 pounds and measures 18 x 17 x 3.75 inches. So, definitely this is a compact unit that can be installed anywhere.

The heater comes in a sleek design and has a copper and stainless steel construction that requires little maintenance and enhances its longevity. The only setback you are likely to experience with this EcoSmart ECO 27 Electric Tankless Water Heater is the fact that it requires professional installation, which might cost you a few extra bucks.

Key Features
  • Digital temperature control
  • Copper and stainless components
  • Compact size
Specifications
  • Flow Rate: 0.3 GPM
  • Manufacturer: EcoSmart
  • Warranty: Lifetime Warranty on electronics, exchanger and element
Pros
  • Digital control panel is easy to monitor and use
  • Energy efficient
  • Saves space
  • Saves money
Cons
  • Small in size
  • Requires professional installation

This EZ Ultra HE Natural Gas Condensing Tankless Water Heater offers up to 3.4 gallons of hot water a minute. This unit is designed to occupy less space. You can also rely on it to supply your small apartment with hot water constantly without delays. In fact, this unit can serve two outlets simultaneously. What’s more, it comes with an LCD control panel that allows you to adjust temperatures and water flow. This panel has a variety of temperature settings to help you choose the right one for your needs. In addition, the EZ Ultra HE tankless water heater has a direct dual vent chamber exhaust.

This unit has a water flow rate of up to 3.4 GPM at 45F. With this heating system, you will only need to drill one hole in your wall. What’s more, it does not extract air from the room where it is installed. This device is fully automatic. Therefore, it fires up and switches off depending on the water flow. All you have to do is select the preferred temperature on the LCD display and the EZ water heater will do the rest and ensure the right temperature is achieved.

This unit boasts 88 percent energy efficiency, which means that you are going to cut down on your energy bills significantly. It can easily be moved from one place to the other thanks to its portability. The device is less obstructive and very easy to install. The only problem with this water heater is that it is only suitable for small households.

Key Features
  • Back-draft prevention device
  • Stainless steel horizontal vent pipe
  • Condensing Technology
  • Solid Core Schedule 40 PVC/CPVC pipe
Specifications
  • Flow Rate: 3.4 GPM
  • Manufacturer: EZ Tankless
  • Warranty: One-year warranty for parts
Pros
  • Uses exhaust gas to preheat water
  • High energy efficiency
  • Capture and removal of acidic condensation
  • Fully automatic operation
Cons
  • Only suitable for small households

As space in our homes and businesses continue to shrink, we are forced to adopt new ways of doing things without disrupting our comfort and productivity. This has given rise to new appliances that are designed to fit in our limited spaces and continue to give us the same service as their customary counterparts. The tankless water heater is one such invention that has allowed us to have hot water flow into our showers and sinks more efficiently than traditional tank models.

This system has become very popular among property developers and homeowners largely due to its flexibility with regard to installation. Its compact design enables the user to install it wherever they want without worrying about space. There are many other reasons why you should invest in this water heating system. Here are a few.

  • This heater literally eliminates standby losses since it does not have a storage tank and long pipes where the heated water could cool down again. So, it saves energy.
  • It minimizes water losses because it is designed to release the heated water immediately, thus eliminating the chances of losing water as you wait for hot water to get to the remote faucet.
  • As long as this water heater operates within its required capacity, you are guaranteed to get hot water consistently.
  • Compared to water heaters with tanks, tankless heating systems last longer.

But for you to enjoy these benefits, you have to choose the right tankless water heater. Here are a few things to keep in mind when choosing and installing a tankless heating system.

Powering Mode

A tankless water heater can be powered by either natural gas or electricity. So, before you place an order, make sure you understand the fuel type of the system. If you want an electric heater, you need to have the right voltage outlet, a separate circuit for the heater and your home has to have enough amperage draw to be able to support the heating system. And if you choose the natural gas system, you must have enough gas supply to fire the heater. Also, a gas heating system requires enough venting. This might force you to retrofit your home.

Flow rate

The flow rate of a tankless water heater is measured in gallons per minute (GPM). This flow rate is the one that determines the number of outlets or fixtures you can use at the same time. Luckily, there are many tankless heaters that are designed to support two or more outlets simultaneously.

Space

One thing that makes tankless water heaters popular is their compact size as it enables them to easily fit in small spaces. So, if you are looking to install a water heater in your small apartment or business, you have to compare its size and the available space for installation.

Features

Water heaters have long ceased to be the bulky, complicated systems that required special expertise to install and operate. Today’s systems are sleek and simple to use thanks to the ongoing technological advancements. Therefore, you need to check whether the unit you wish to buy has all the right features. Make sure you read as many reviews as possible before you make the final decision.

In conclusion, the best tankless water heater is determined by numerous factors but, overall, it has to fit your preferences and  water needs. The good thing is that there is a wide range of tankless water heaters from which to choose.

Resources— Compact Appliance, Plumbing Supply

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