Best Tankless Water Heaters of 2019

With the winter season still very much on, hot water supply can be a tough ask for many homes. Fortunately, water heaters are available to making living less turbulent.

While tankless water heaters provide a viable alternative to storage heaters, you might have to shell out a tidy sum to acquire them. But you would be saving even more extra cash on your energy bills since hot water isn’t stored in tanks but produced when needed.

Stiebel Eltron Tempra Plus Review
Stiebel Eltron Tempra Plus
Best Overall
  • Self-Modulating Power Technology
  • Advanced Flow Control
  • Sleek Design
  • Proven Reliability

Best Tankless Water Heaters - Comparison Table

PicturesBrand and ModelFlow RateVoltageWeightBuy Now
Stiebel Eltron Tempra Plus ReviewStiebel Eltron Tempra Plus9.8 GPM120 Volts19 PoundsBuy on Amazon
Rinnai RUC98iN Ultra Series ReviewRinnai RUC98iN Ultra Series9.8 GPM120 Volts81.6 PoundsBuy on Amazon
Takagi T-KJr2-IN-NG ReviewTakagi T-KJr2-IN-NG6.6 GPM120 Volts38 PoundsBuy on Amazon
EcoSmart ECO 27 ReviewEcoSmart ECO 27N/A240 Volts16.8 PoundsBuy on Amazon
Rinnai V75IN 7.5 GPM ReviewRinnai V75IN 7.5 GPM7.5 GPM120 Volts70.5 PoundsBuy on Amazon

While it’s easy to surf e-commerce platforms for a suitable tankless water heater on the market, it’s quite difficult to identify the real deal in a space filled with more junk than a junkyard. And with the cost of the average tankless water heater on the high side, you might want to be cautious when clicking the ‘buy’ button.  

Assembled in this review are the best tankless water heaters money can buy. Also, there are some seasoned tips to help you avoid making a knee jerk purchase. Read on!

1. Stiebel Eltron Tempra Plus - Best Overall

Stiebel Eltron Tempra Plus Review
  • Self-Modulating Power Technology
  • Advanced Flow Control
  • No Venting Required
Max Flow Rate: 9.8 GPM | Weight: 19 Pounds | Voltage: 120 Volts

Tank type water heaters aren’t space-friendly. Also, your energy bills will almost always be on the high side. This makes the tankless water heater a more viable option. And it doesn’t get better than the Stiebel Eltron Tempra Plus tankless water heater. With this unit, you don’t have to spend extra resources on venting. It’s worth mentioning that the heating chambers are made using quality copper which makes for extra durability in the long run.

While in use, the Tempra Plus remains absolutely silent. With the compact nature of this unit, you are afforded the luxury of more space in your home. Since the water gets heated on demand, you save more on your energy bill. And the self-modulating technology of the Stiebel Eltron introduces a humbling effect on the energy cost for your home.

While installation isn’t a mountainous task, you might want to get professional help. Aside from the installation process, there are electrical requirements which are financially demanding so you might want to be aware of that. But its durability is well worth the cost as it could last decades while helping you knock some digits off your energy bill.

2. Rinnai RUC98iN Ultra Series - Second Best

Rinnai RUC98iN Ultra Series Review
  • Recirculation capability
  • Dual Heat Exchangers
  • Wi-Fi Capable
Max Flow Rate: 9.8 GPM | Weight: 81.6 Pounds | Voltage: 120 Volts

Compared to our number one choice, this tankless water heater uses natural gas/propane to heat up the water supplied. The condensing technology ensures heating efficiency is closer to perfection than ever before. While it saves you money on your energy bills, you would have a small amount of NOx emission to worry about and there’s the cost of purchasing the fossil fuel to add to that.

With the Rinnai RUC98iN, you have a compact unit which doesn’t take up all the space in your home. Being an indoor unit makes it a great addition to a small apartment struggling with the cold ground water of the winter season.

Despite the huge positives of this tankless water heater, it falls short of our top pick for a few reasons. It’s more expensive and requires venting done to perform optimally. However, the Rinnai offers venting options – PVC and Concentric – giving you the opportunity to choose what’s good for your home.

3. Takagi T-KJr2-IN-NG - Best Value for Money

Takagi T-KJr2-IN-NG Review
  • Inlet, outlet thermistors for constant temperature monitoring
  • Cost Efficient
  • Environment Friendly
Max Flow Rate: 6.6 GPM | Weight: 38 Pounds | Voltage: 120 Volts

With the high cost of tankless water heaters, finding budget-friendly options which offer some semblance of decent service can be a tough ask. The Takagi represents a viable option choice in this regard. You are guaranteed adequate temperature regulation using the thermistors provided in the concerned channels. This gives you the opportunity to control the heat of the water discharged at the relevant places in your home.

Powered using natural gas, this tankless water heater’s NOx emission is considerably low, and this is great for the environment. Also, you should see a considerable drop in your energy bill as the water gets heated on a per use basis.

This budget-friendly tankless water heater is one of the few in its category with the capacity to heat gallons of water on a stretch without any breaks. While installation isn’t difficult, it can be a handful for those without the required skill.

The small size of this unit ensures it wouldn’t take up all the space in your property. You wouldn’t have to begin decluttering just to provide space for the unit – a situation which is typical of the tank type water heaters.

With the Takagi, you will need a vent since natural gas is burnt to bring about the water heating functionality. This will add to the cost of installation so you might want to take note of that.

4. EcoSmart ECO 27 - Best Electric

EcoSmart ECO 27 Review
  • Digital temperature control
  • Cost Efficient
  • Compact size
Max Flow Rate: N/A | Weight: 16.8 Pounds | Voltage: 240 Volts

Just like our top pick, the EcoSmart ECO 27 uses electric power in heating water. This means having a vent isn’t a prerequisite since there’s no burning of fossil fuel going on. This should result in a reduction of the installation cost.

While the durability of this unit is topnotch, the heating element would need to be replaced over time, and this can be done easily replaced. The heating capacity of this EcoSmart device is greatly limited – only a few gallons of hot water on demand. This is hugely due to its use of electric power through copper exchangers to heat the water available.  

The ECO 27 allows you to control the temperature of the flowing water using a remote control device (sold separately). This means the unit can be set up in one place and operated in another.  

Don’t get alarmed about how much energy the ECO 27 would consume, it works only when you need hot water, and this is certainly not every time. This way, your energy bill wouldn’t be frightening to look at. Also, compared to the tank type water heaters, you are saving a lot of resources since the hot water isn’t stored.

The compact nature of this tankless electric heater is enviable. You don’t have to worry about another cumbersome electronic taking up some much-needed space in your home.

5. Rinnai V75IN 7.5 GPM - Worth Mentioning

Rinnai V75IN 7.5 GPM Review
  • Leak detection
  • Temperature lock
  • Enhanced scale detection
Max Flow Rate: 7.5 GPM | Weight: 70.5 Pounds | Voltage: 120 Volts

This is another tankless water heater capable of challenging effortlessly. It has all the attributes of a well-built unit and coming from Rinnai, there’s little to dispute.

While this tankless water heater runs on natural gas, its NOx emission is extremely low. The V75IN is made for smaller households with lower hot water demands, and that’s why it’s more affordable compared to our second best on this list, the Rinnai RUC98iN.

The ability of this unit to deliver an endless stream of hot water is indisputable though you might have to be a little patient as it could take as much as a minute due to heating constraints. Typical of a tankless water heater, the V75IN saves you tremendous floor space since a traditional tank is unnecessary.

One of the biggest challenges with the use of heaters of all kinds is the amount of energy they consume in the long run. With tankless water heaters such as the V75IN, you are likely to save more on your energy bills as the water is heated only when it’s needed. The traditional tank type water heaters are considered primitive for this singular reason – water is heated on a regular basis, stored and used when needed. Such a process isn’t only ambiguous, but it’s energy consuming.

Regardless of the tremendous positives of this tankless water heater, it has its fair share of negatives. Its installation process is one of such. You are going to need professional assistance, and it’s quite expensive. Sadly, Rinnai has failed to enlighten potential buyers on the nitty-gritty of the product installation through appropriate quarters. This shouldn’t be the case. Also, you will need to factor in the cost of the gas used in running the tankless water heater in addition to your energy bill.

Best Tankless Water Heater - Buying Guide

Frankly, the journey to owning a tankless water heater is a luxury, and only those with the financial capacity can embark on such. This isn’t just about buying such a device but the installation process as well. And if things go south, that’s valuable resources down the drain.

In this section, we will be looking at everything you should know about tankless water heaters and choosing the ideal one for your home.

Tankless water heaters are generally of two variants: electric and gas types.

This isn’t exactly distinctive as gas types tend to require electricity as well. Before settling for a tankless water heater, understand how it runs. If you are not comfortable with burning fossil fuels, avoid the gas types. Also, the gas types require additional vent arrangements so you might want to consider that before opting for such. 

Confirm the temperature of the groundwater in your area before you opt for any tankless water heater. You shouldn’t have to rely on heaters of this kind if it’s not hovering around freezing temperatures. Also, different units work with distinct temperature ranges. It is common practice for manufacturers of tankless water heaters to provide charts on the temperature range covered by their individual products, so ensure you look at those before making a final decision.

As tankless water heaters come in different forms, their capacity varies. You have to be proactive when picking products of this kind as it’s quite easy to end up with a unit that underperforms. As previously reiterated, find out enough about the product especially as it concerns its capacity before you part with your money. Tankless water heaters don’t come cheap so value for money shouldn’t be taken lightly. If you have a small household, don’t settle for something small. Ideally, pick a heater which can handle the hot water demand of your household within the shortest time possible. Manufacturers often provide enough information on this subject, take advantage of such.

If an electric tankless water heater is what you want, beware of their steep energy requirements. This shouldn’t come as a surprise since units of this kind use electricity in place of fossil fuel. Yes, electric tankless water heaters will save you energy in the long run but not on an interim basis. If you want short term energy saving, a water heater doesn’t fit that description.

While tankless water heaters are compact and ‘space-friendly’, you still have to pick the right spot to place them. Yes, they can be placed anywhere, but there are exceptions. Places susceptible to extreme temperatures should be excluded. Acting to the contrary would most likely damage the unit.

When picking a location for your tankless water heater, take your existing plumbing structure into consideration. The location of the unit could be pivotal to its proper functioning. Also, if your chosen location would require tinkering with the plumbing system in your home, then it’s advisable you pick a location which would require no such alteration. And if you have kids around, the location of the tankless water heater has to be beyond their reach as the output pipe can get quite hot.

Ideally, the right spot for a tankless water heater isn’t just ‘safe’ but accessible as well. While units of this kind will save you lots of floor space compared to the tank type water heaters, you are still likely to have a headache over the possible location of the device.

Final Words

Tankless water heaters are a great addition for homes which have to deal with extremely cold ground water. Yes, they are expensive compared to the tank types, but they are trendy, energy saving and don’t take up much room. While picking the right one can be a tough ask, those considered in this review represent value for money. They are durable, energy saving and perform flawlessly; you don’t get these attributes too often.

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