Natural Gas Water Heater Reviews

Top 5 Best Tankless Gas Water Heater Reviews 2023

Water is something that we use every day for various purposes. But sometimes normal temperature water is not enough for daily activities like showering, laundry; especially in cold climates. This is where water heaters come in.

Top 5 Best Tankless Gas Water Heater Reviews 2020

The market is filled with different kinds of water heaters using different energy resources. Among them, Tankless gas water heaters are definitely the best due to their low energy consumption and low cost over the years.

Not sure about which one you should buy? Read our article about the best tankless gas water heater reviews to get an answer to all your questions!

Things to Consider Before Buying A Tankless Gas Water Heater – Buyer’s Guide

Before purchasing a natural gas water heater, these are the things you should consider –

  • Flow Rate

Always get a heater whose flow rate matches the water usage of your family. If you have a large house, a heater with at least 7 GPM is ideal, while 4 GPM is good enough for a small household.

  • Energy Efficiency

Try to invest in products that do not consume as much energy while providing the same benefits as others. A good way to ensure this would be to buy heaters that use the condensation technology, or any other energy-saving processes.

  • Safety Features

Look for features such as leak detection, child locks, temperature controls, etc. in your unit to ensure a safe situation.

  • User-Friendliness

User-friendly interfaces, LED displays, easy installation processes are things that you should aim to get with your new water heater.

Editor’s Picks: Top 3 Best Tankless Gas Water Heaters

Table could not be displayed.

5 Best Natural Gas Water Heater Reviews

Here we are going to review our recommendations to help you make the right choice.

1. Rheem RTG-84XLN Natural Gas Tankless Water Heater

This one is a great choice for those who want a constant supply of warm water in their homes, along with other amazing features. Equipped with a water flow rate of 8.5 gallons per minute, it can provide hot water simultaneously in one kitchen faucet and two bathrooms, which is more than enough for a middle-sized family mostly.

The best thing about this water heater is that it is quite energy efficient. You do not have to wait for a long time to get the hot water flowing out of the unit, thereby saving a lot of water in that process. This can actually save up to 1000 gallons of water, and also help to keep your water bill to a low digit.

Using only natural gas makes this product quite different from other alternatives. Apart from that, not using too much natural gas is another benefit of this product, making it quite environment-friendly. Its parts are made out of high-quality stainless steel, which helps to keep its exterior well maintained.

One of the other great things about this product is its compact size. This inevitably helps to save a lot of storage space. Its design also allows you to tuck in all extra wires away from the main unit to get a clean, polished look.

And since this is an outdoor water heater, you do not need to do any drilling, which makes the installation process quite easy.


  • Reduces harmful emissions
  • Made from high-quality materials
  • Energy efficient
  • Environment-friendly
  • No drilling needed
  • Compact size
  • Clean and compact look


  • A bit heavier than other alternatives

2. Rinnai V75in Series HE Tankless Hot Water Heater

The Rinnai V75in water heater is quite popular among users, and for all the right reasons. First of all, this model is as environmentally friendly as you can expect a water heater to be. Its concentric venting system allows you to get the hot water you need for your home, without having it produce any harmful gases.

Along with not producing emissions, this device also excels at saving energy. In fact, it uses 40% less energy than other alternatives, mostly due to its temperature lock system.

This unique feature enables this product to make sure that nothing is meddling with the temperature that you have set your water to. You can set it anywhere from 98 to 140 degrees Fahrenheit.

One of the best things about this model is how easy it is to install and maintain. The manual provides all the instructions needed.

To keep maintenance minimal, this has a lot of features like scale detection system, which serves as a reminder if your water needs more descaling. A leak detection system also helps you get the repairing job done before any damages happen.

A neat, compact design adds to the upsides of this model. The unit is quite small in size and helps to save a lot of storage space. And the white color gives it an elegant look and adds to its sophistication.

Its small size is also perfect for providing water to small to medium-sized families, where large models would cause an unnecessary waste of money and energy.


  • Reduces harmful emissions
  • Uses energy efficiently
  • Easy installation process
  • Equipped with a temperature lock system
  • Has a smart safety system
  • Great for small to medium-sized homes
  • Clean and compact look


  • Might take a little longer to heat the water up

3. Excel Pro Tankless Gas Water Heater 6.6 GPM

The Excel water heater has some unique features, and therefore known as the best natural gas on-demand hot water heater.

Now, the hot water output of this particular model depends on the flow rate of the household appliances that it is catering to. This makes it quite a beneficial option for saving energy and money, as you do not need a lot of heating when your flow rate is low.

A great thing about this model is its easy installation process. It comes with manuals that heave clear instructions about what part goes where making this whole thing a lot less time-consuming.

This product is a wall-mounted design, which is very conventional. You can get this up sideways or vertically, as per your preference.

Another amazing feature of this product is that it uses copper heat exchangers, which enables the healing process of the model. This heat exchanger also helps to save more than 84% energy while in use, making this a great energy-efficient product.

Therefore, if you are big on consuming as less energy as possible, you know what to buy.

Along with all these features, this product is very user-friendly too. You can have full control of this after installing it through the help of the LCD display.

This allows you to fix your heating schedules, water temperatures with minimum hassles and is easy to figure out for even a technically challenged person. Although the reading is in Celsius, it is easy to get a hold of it.


  • Modulates heat output according to the flow rate
  • Easy installation process
  • Efficient use of energy
  • Uses copper heat exchanging
  • User-friendly display
  • Wall-mounted design


  • The LCD display shows temperature in Celsius by default

4. Takagi T-H3-DV-N Tankless Water Heater

If you have a large family and been having trouble finding a heater that does not run out of hot water frequently, then you have just come across the perfect product.

This Takagi water heater has an amazing water flow rate of 10 gallons per minute, which means that you can have water flowing in your shower, sink, dishwasher, and laundry all at once without any issues.

The temperature stings of this model are also commendable as it can reach 185 degrees Fahrenheit. This is a great feature for those who need some simmering water for their daily uses as opposed to some lukewarm water.

Also, the use of natural gas to run the system adds to its list of pros, as now you can have all the hot water you want while not wasting too much energy at all.

One thing that sets this product apart from many others is its unique condensing system. With the help of this, it condenses the steam into the water instead of emitting it out like a normal gas unit.

This helps it to keep it as a very clean and energy-efficient option for environment-friendly users. The various safety features included in this model helps in this regard as well.

Besides all these, this model is quite durable as well and does not need a lot of maintenance in order to keep it up and to run for a large number of years. The installation process of this unit is also quite straightforward, as it comes with all the necessary equipment and the manual with the instructions.

However, if you face any trouble, it is best to seek the help of a professional.


  • Amazing temperature output and flow rate
  • Best for large families
  • The condensing system helps to reduce emissions
  • Equipped with various safety features
  • Runs with the help of natural gas
  • Installation is quite easy


  • A little bit on the expensive side

5. Eccotemp i12-NG Tankless Water Heater

If you are looking for an indoor water heater that does its job well, while not wanting to deal with the messy look that it comes with, this is the perfect model for you.

This product comes with a stylish black acrylic glass casing, which adds quite an elegant look to your home. The material is also very durable yet lightweight, making this a very smart choice for any home.

However, the look is not everything, so let’s dive into the uses of this device. It has a flow rate of 3 gallons per minute, which makes it optimal for the uses of a small family. This is mainly because having a huge flow rate will not come to any advantage if that amount of water is not being used, and only adds to the expenses.

One of the best things about this model is its touch screen and LED display, which shows the temperature the water is at, and the flow rate. Its temperature control system allows you to manually set the water to the temperature that you prefer, and keep it that way.

The child locking technology it comes with also acts as a safety feature, making sure no one meddles with the heat.

Using natural gas instead of electricity in this model has made it an energy-efficient, environmentally friendly option. Hence, this is great for people who are conscious about the environment.

The installation process of this model is also very simple and straightforward and does not require that much technical skill at all. Overall, this is definitely the best natural gas hot water heater.


  • The sleek design gives you a premium vibe
  • It is quite durable
  • Ideal for small families
  • Equipped with temperature controls and LED display
  • Uses natural gas
  • Installation is quite easy


  • Might not get constant hot water flow on too many points simultaneously

What Is A Tankless Gas Water Heater?

A tankless gas water heater is a type of water heater that runs on gas and doesn’t require a storage equipment (tank) to operate. It is a superb alternative to the classic tank water heaters that stored heated water in a tank which was then accessed by the user on demand.

Comparatively speaking, tankless gas water heaters do not have a storage unit so the water is heated whenever the user asks for it. This makes them quite efficient as they use exactly the amount of energy as required. Adding to that, they are also environment friendly as they use natural gases to heat water.

Top 5 Best Tankless Gas Water Heater Reviews 2020

If you use a tanked water heater and live in an cold area, the tank is completely useless for you. On the other hand, tankless gas water heaters will do the job exactly the way you want it to.

Of course, if you live in an area with hot climate, the choice could be tricky especially since some tankless heaters operate with a few seconds of delay. However, if you invest in a high-quality tankless gas water heater, you will receive instant heated water while also saving money on your investment long term.

Types of Tankless Gas Water Heaters

Now that we know exactly what a tankless gas water heater is, it is time to learn about its types. Here is a detailed overview of each of them.


Non-condensing tankless gas water heaters use a heat exchanger to heat water. They were invented in Japan and are also the first installment to tankless water heating technology. They are quite efficient as they can reach an efficiency factor of up to 0.85. Despite that they still aren’t the most efficient type of tankless gas water heaters.

Overall, non-condensing tankless water heaters are quite reliable and durable. However, sometimes they can reach unwanted levels of high temperature. Hence, the user might need to install a stainless steel vent of some kind to make sure that no consequences are faced.


Condensing tankless gas water heaters is an upgrade to non-condensing water heaters. Unlike the latter, these heaters use two heat exchangers to heat water. To put into simple words, they have a primary heat exchanger that heats water but only to a certain temperature level. Now, the secondary heat exchanger comes into play when the user demands for water that exceeds the temperature levels that can be achieved by the primary one.

These tankless water heaters are much more efficient than the first generation. To put things into perspective, they increase efficiency levels by 94 percent. Adding to that, you can also add a PVC vent system here making them cheaper than non-condensing ones. But it is worth noting that if you demand for small amounts of heated water, they might not be as efficient comparatively.

Condensing Hybrid

Though the purpose of tankless gas water heaters is to provide heated water without having to use a tank, the condensing hybrid tankless water heater comes with a storage unit. But that makes them different from tanked water heaters is that the storage unit here is only about 2 gallons which is small but quite smart for most households.

Condensing hybrid water heaters can instantly provide heated water as they can use their storage unit while the heat exchangers go in to work as soon as the user demands for water. This makes them the most efficient type of tankless gas water heater. And since you can use a PVC type vent, they are also quite easy on the pocket.

When Should You Replace Your Water Heater?

To know when to replace your water heater, you should always look at the expiring date of your model. Most water heaters are supposed to last for 8-10 years, but quite a few might not make the cut for different reasons. Some of these reasons include rust, leakage, noises, and unheated water.

When Should You Replace Your Water Heater?

If you find any rust in your tank or the water it is heating, know that it is time for a replacement. The same goes for when it’s making unusual noises or leaking.

And if it fails to do the main purpose it was purchased for – that is – to heat water, then you should also look for another alternative. You should, of course, try maintenance and talking to a professional first, though.

How Does A Water Heater Work?

There are different types of water heaters, and each one works differently. We are going to see how three main types– tank, hybrid, and tankless water heaters work :

Tank Water Heaters

These types of heaters are the most common in households and feature a large storage tank. It operates either by gas or electricity. When cold water enters the tank, it is heated up by either a gas flame or electrical components, and then distributed to the output points.

While a gas-operated tank heater is more expensive than the electric one, it costs less energy.

Hybrid Water Heaters

A hybrid water heater consumes the least amount of energy among these three types. Through the help of a condenser and evaporator, this product heats up the water by using the heat from the room it is in. This saves almost 60% of energy.  It is operated by an electric pump.

Tankless Water Heaters

This kind of water heater is also known as an on-demand heater because it does not store any water previously for heating. When any hot water tap is opened, water is heated in the tankless unit by a burner or electric components at the preset temperature, and then delivered straight to the faucet point instead of being stored.

These models save 34% energy than regular ones.

Frequently Asked Questions (FAQs)

Q. How much water can gas water heaters provide?

There isn’t a set amount as to how much water a tankless gas water heater can provide. However, generally speaking, you can expect up to 2–5 gallons (7.6–15.2 liters) per minute.

Q. How much money can I save using a tankless water heater?

Tankless water heaters are the most efficient type of water heaters. Hence, you would be saving some money regardless. As per the amount, it depends on exactly what you’re comparing to and what type of gas water heater you own. But you can expect about $200-350 of money saved per year.

Q. How long does it take for water to get hot using a tankless water heater?

Most tankless water heaters can heat water in about 5 to 15 seconds. Therefore, similar to tanked water heater, there is a slight delay when demanding for hot water from a faucet.

Q. Which is better – electric or gas tankless water heater?

Each has its own benefits. Electric tankless water heaters tend to be more efficient and quick. On the other hand, gas heaters are cheaper and better for the environment.

Q. Can a tankless water heater work for the whole house?

You should invest in a water heater as per your demands. If you have a large family that requires constant hot water throughout the day, you should invest in a heater that has an extremely high GPM.

A Final Word

Water heaters have become an essential part of most people’s lives now. Whether you need to replace your existing one or purchase a new product to see the benefits that come along with it, we hope these Tankless gas water heater reviews will help you.

On an ending note, we personally recommend you to buy:

Environment friendly, made out of high-quality material, compact, and reliable. This product has everything you can wish for in a tankless gas water heater. Ideal for small and medium duty applications.

Last update on 2023-12-08 / Affiliate links / Images from Amazon Product Advertising API. WaterFilterly is user-supported. We might receive a commission on any purchase you make through clicking links on this page.

Similar Posts