Top 10 Best Tankless Gas Water Heaters : Reviews & Buying Guide

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Buying a Tankless Gas Water Heaters seems like an easy job, but not everytime. There are hundreds of Tankless Gas Water Heaters available on the market from various producers, which is enough to confuse you. They are so similar in terms of performance, quality, longevity, and overall user experience that choosing a final buying decision may be tough. All you need at that point is a comprehensive buying guide to help you find the ideal Tankless Gas Water Heaters for your needs.

In this article, we will go over a few important points to consider about before buying a Tankless Gas Water Heaters. You can call it a proper review guideline for you which will cover pros and cons of your desired product including its sustainability, affordability, functions, and also practical benefits. There will also be a solid comparison of a few related products. As a result, you’ll be able to quickly select the best option for your needs. Let’s take a look at what’s going on inside.

Best Tankless Gas Water Heaters : Top 10 Picks

Last update on 2024-04-24 at 17:41 / Affiliate links / Images from Amazon Product Advertising API


10 Best Tankless Gas Water Heaters Reviews According To Experts

We tried to find the top ten Tankless Gas Water Heaters from thousands of different products in this section. This list will make you feel easy to get your desired Tankless Gas Water Heaters within a few minutes. We emphasized their usefulness, performance, durability, outlook, affordability, and previous user experiences. We are confident that this list of the top 10 Tankless Gas Water Heaters will help you find the one that best fits your needs.

Bestseller No. 1
Rheem RRTGH95DVLN3701177 Rheem RTGH Series 9.5 GPM 199,900 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless Steel
  • Flow rate of 0.4 - 9.5 GPM
  • Available temperature settings range from 100 to 140F (default setting of 120F)
  • Includes electric ignition
  • Covered under 1 year labor, 15 year heat exchanger, and 5 year parts manufacturer warranties
  • Width 17-11/16-in
SaleBestseller No. 2
Rinnai RU199iN Condensing Tankless Hot Water Heater, 11 GPM, Natural Gas, Indoor Installation
  • Endless Hot Water: Our tankless hot water heaters offer unlimited whole-home hot water flow and come equipped with Circ-Logic for pairing with an external pump to reduce wait time for hot water via scheduled or on-demand recirculation
  • Energy and Space Efficient: The tankless design of this small hot water heater saves on space and conserves energy as it heats only when necessary
  • Optimal Water Pressure: With a hot water flow rate of up to 11 GPM, this tankless water heater provides a powerful, constant stream that can accommodate up to 7 appliances at once
  • Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your water heater; We do not recommend installing a water heater without a technician
  • Guaranteed to Last: 15-, 5-, and 1-year residential for heat exchanger, labor, and parts, respectively; Wifi monitoring available with Controlr module (not included)
Bestseller No. 3
Tankless Water Heater Natural Gas,4.74GPM 18L Indoor,Instant Hot Gas Water Heater,Constant Natural Water Heater with Fahrenheit Digital Display,Multi-Protection (Black)
  • 【Tankless Water Heater】- Natural Gas water heater tankless Steady Steady Temperature Control with more safety protection such as flame failure device,anti-freezing protection,over heating protection,Just need 3.6PSI of water pressure,4.74gallons of hot water can be output per minute.The maximum temperature raise is 167°F,Applicable only Natural Gas(LNG)
  • 【Efficient & Energey Saving】-The 4.74 GPM Instant Natural Gas Water Heater ,Maximum power output 68000btu/hour,on-demand hot water for 2-3 points simultaneous water supply for bathroom,kitchen hot water demand,Natural Gas Water Heater exchanger and main burner are desinged with advanced combustion technology to decrease gas consumption and burning noise.
  • 【Quality Material】-This of ours Water Heater Crafted from stainless steel, our Propane water heater exhibits high temperature resistance and corrosion resistance. It also features a built-in oxygen-free copper water tank, reduce heat loss ensuring a prolonged service life.with with LED smartdigital display effortlessly adjust the temperature between 86°F-167°F according to your preferences.
  • 【Easy Assemble and Use】-Applied with standard 1/2" NPT water fitting and gas inlet, comes with 2.5" horizontal vent pipe for quick installation.Note: For normal operation, this product must be installed with proper ventilation and a smoke exhaust pipe.
  • 【Widely Application 】-Save over 50% of available space compared to tank water heater.for both bathroom and kitchen hot water demand. great for home,small cabins and remote apartments indoor installation. without the need to install an expansion tank,Note: In cold weather, if the water heater is not used for a long time, it is necessary to open the pressure relief valve to drain the residual water in the water heater.
Bestseller No. 4
forimo Tankless Water Heater Natural Gas,7.4 GPM Indoor Gas Tankless Water Heater,Constant Natural Gas Water Heater, Quickly On Demand Tankless Water Heater Gas,Multi-Protection
  • 【Tankless Water Heater】- Natural Gas Water Heater on demand, making it more energy-efficient than traditional tank water heaters,Steady Steady Temperature Control with more safety protection such as flame failure device,anti-freezing protection,over heating protection,Just need 3.6PSI of water pressure,7.4gallons of hot water can be output per minute.The maximum temperature raise is 167°F.
  • 【Super High Efficiency】-Tankless water heaters Natural Gas Energy efficient with plenty of hot water, also known as demand-type or instantaneous water heaters, provide hot water only as it is needed. They don't produce the standby energy losses associated with storage water heaters,7.4 GPM Instant gas tankless water heater ,Maximum power output 170000 btu/hour,on-demand hot water for 3-4 points simultaneous water supply for bathroom.
  • 【Quality Material】-This of ours gas tankless water heater Crafted from stainless steel, exhibits high temperature resistance and corrosion resistance. It also features a built-in oxygen-free copper water tank,Powerful DC motor is more stable than AC motor No noise, ensure stable combustion.Adopting the world's most advanced technology, superior safety and durability,With leakage protection switch, to protect personal safety,with LED smartdigital display effortlessly adjust the temperature between 86°F-167°F according to your preferences.
  • 【Easy Assemble and Use】-Applied with standard 1/2" NPT water fitting and gas inlet, comes with 2.5" horizontal vent pipe for quick installation.improve air quality by reducing greenhouse gas emissions ,Note: For normal operation, this product must be installed with proper ventilation and a smoke exhaust pipe.
  • 【Widely Application】-Save over 50% of available space compared to tank water heater.also compact and easy to install, saving you valuable space in your home,for both bathroom and kitchen hot water demand.great for home,small cabins and remote apartments indoor installation. without the need to install an expansion tank,Note: In cold weather, if the water heater is not used for a long time, it is necessary to open the pressure relief valve to drain the residual water in the water heater.
SaleBestseller No. 5
Mizudo Natural Gas Tankless Water Heater 3.6 GPM, 80,000 BTU Indoor Installation Instant Hot Water heater
  • 【Instant Hot Water Heater】Tankless water heaters can provide endless hot water on demand for 2- 3 water points.
  • 【Comfortable Bathing Experience】3.6 GPM hot water flow, precise temperature control, no water temperature sandwich.
  • 【Premium design and Durable】Adopt oxygen-free copper water tank, reduce heat loss, high efficiency and durability.
  • 【Compact Design】Save over 50% of available space compared to tank water heater.
  • 【Quality Service】If you encounter product quality problems, you can contact us by phone, email and message, and we will provide service according to the warranty policy.
Bestseller No. 6
Rinnai RU160iN Condensing Tankless Hot Water Heater, 9 GPM, Natural Gas, Indoor Installation
  • Endless Hot Water: Our tankless hot water heaters offer unlimited whole-home hot water flow and come equipped with Circ-Logic for pairing with an external pump to reduce wait time for hot water via scheduled or on-demand recirculation
  • Energy and Space Efficient: The tankless design of this small hot water heater saves on space and conserves energy as it heats only when necessary
  • Optimal Water Pressure: With a hot water flow rate of up to 9 GPM, this tankless water heater provides a powerful, constant stream that can accommodate up to 6 appliances at once
  • Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your water heater; We do not recommend installing a water heater without a technician
  • Guaranteed to Last: 15-, 5-, and 1-year residential for heat exchanger, labor, and parts, respectively; Wifi monitoring available with Controlr module (not included)
Bestseller No. 7
Orbek 80,000 BTU Residential Indoor Natural Gas Tankless Water Heater, 120 Volt On-demand Instant Hot Water Heater, CSA Certified Multiple Points of Use Water Heater
  • 𝐌𝐨𝐫𝐞 𝐏𝐫𝐚𝐜𝐭𝐢𝐜𝐚𝐥 𝐓𝐚𝐧𝐤𝐥𝐞𝐬𝐬 𝐖𝐚𝐭𝐞𝐫 𝐇𝐞𝐚𝐭𝐞𝐫: The capacity of traditional tank water heaters is limited. When the hot water is used up, it takes a long time to wait for the heat to be recovery. The significant advantage of tankless water heaters is that they can provide uninterrupted hot water on demand. At the same time, the on-demand hot water supply also means that tankless water heaters do not need to continue to consume gas when on standby like tank water heaters.
  • ±𝟏℉𝐏𝐫𝐞𝐜𝐢𝐬𝐞 𝐓𝐞𝐦𝐩𝐞𝐫𝐚𝐭𝐮𝐫𝐞 𝐂𝐨𝐧𝐭𝐫𝐨𝐥: The water flow sensor counts the water flow flowing through the heat exchanger, the intelligence chip calculates the amount of gas required to heat the water flow to the set temperature, and the gas regulating valve accurately supplies the appropriate amount of gas to the burner. This series of precise operations enables the ORBEK water heater to achieve ±1℉ water temperature control.
  • 𝐃𝐢𝐯𝐞𝐫𝐬𝐞 𝐔𝐬𝐚𝐠𝐞 𝐒𝐜𝐞𝐧𝐚𝐫𝐢𝐨𝐬: In winter, the water heater goes into full heating mode, providing enough warm water to meet the needs of a bath in the bathtub. In summer, the anti-scalding mode is activated, so you don’t have to worry about being scalded by hot water when taking an early shower and ruining your good mood for the day. No matter what the situation is, ORBEK water heaters will make the right choice.
  • 𝐂𝐒𝐀 𝐂𝐞𝐫𝐭𝐢𝐟𝐢𝐞𝐝 𝐂𝐨𝐦𝐩𝐫𝐞𝐡𝐞𝐧𝐬𝐢𝐯𝐞 𝐒𝐞𝐜𝐮𝐫𝐢𝐭𝐲 𝐏𝐫𝐨𝐭𝐞𝐜𝐭𝐢𝐨𝐧: In addition to basic safety protection for users such as anti-scalding protection, electric leakage and gas leakage, ORBEK water heaters are also equipped with anti-freeze protection and anti-dry burning protection that can effectively extend the service life of the water heater. Only when both the user and the machine are in a safe state can comprehensive security protection be achieved.
  • 𝐄𝐚𝐬𝐲 𝐭𝐨 𝐈𝐧𝐬𝐭𝐚𝐥𝐥 & 𝐂𝐨𝐮𝐫𝐭𝐞𝐨𝐮𝐬 𝐂𝐮𝐬𝐭𝐨𝐦𝐞𝐫 𝐒𝐞𝐫𝐯𝐢𝐜𝐞: Both the inlet and outlet are standard 3/4” NPT male connectors, which are compatible with most house water pipe sizes. A 3” diameter vent can also be quickly connected to the Standard direct vent termination. Its compact size of 13"L x 7" W x 20.5"H takes up almost no space. If you have any questions about installation and operation, please do not hesitate to contact us and we will serve you wholeheartedly.
Bestseller No. 8
Rheem RTG-70DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater, 7.0 GPM
  • Continuous Hot Water & Comfort When Needed – Provides enough hot water for your entire house, even when using multiple applications such as a shower and dishwasher
  • Save on Energy Costs – High Efficient Water Heater only runs when needed
  • Save Water– Water Saving Setting saves up to 1,100 gallons of water per year
  • Hot-start programming keeps the water heater in a ready state, avoiding any cold-water bursts
  • Leak Protection – LeakGuard Leak Detection & Prevention protects your home from water damage that detects any internal leak, both large or small
Bestseller No. 9
Rinnai V53DeN Tankless Hot Water Heater, 5.3 GPM, Natural Gas, Outdoor Installation
  • Endless Hot Water: Our tankless hot water heaters let you enjoy unlimited hot water flow throughout the house with a compact and durable design that fits your home and lifestyle
  • Energy and Space Efficient Tankless Gas Water Heater: This small hot water heater conserves energy, only heating when necessary; Enhanced scale detection lessens possibility of serious, long-term damage to unit
  • Optimal Water Pressure: This tankless water heater offers a high-performance hot water flow rate up to 5.3 GPM for a powerful, constant stream that serves up to 4 appliances at once
  • Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; We do not recommend installing a water heater without a technician
  • Guaranteed to Last: 10-, 5-, and 1-year residential factory warranty for heat exchanger, labor, and parts, respectively
Bestseller No. 10
Rheem RTG-70XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater, 7.0 GPM, Gray
  • Continuous Hot Water & Comfort When Needed – Provides enough hot water for your entire house, even when using multiple applications such as a shower and dishwasher
  • Save on Energy Costs – High Efficient Water Heater only runs when needed
  • Save Water– Water Saving Setting saves up to 1,100 gallons of water per year
  • Hot-start programming keeps the water heater in a ready state, avoiding any cold-water bursts
  • Save Space - New smaller size, 19%, and reduced weight by 22% compared to the previous model for easy installation and space savings

Last update on 2024-04-24 at 17:41 / Affiliate links / Images from Amazon Product Advertising API




Things To Consider When Buying Tankless Gas Water Heaters

It is impossible to ascertain everything about anything as a human being. It is impossible to be an expert in every field. In that case, going through a proper buying guide can save us from being fool after purchasing a Tankless Gas Water Heaters just because of not knowing properly earlier.

You do not have to be an expert on that specific product in order to purchase it. Just focus on a few key points that we’ll go over later. Taking these simple considerations into account may make your shopping experience more pleasant and straightforward. Let’s get started.

Understand what you require.

The very first thing to discover is your needs or requirements. If you are not properly informed of your demands, there is a big chance that you will purchase the incorrect things at the wrong time and waste a significant amount of money. So, first and foremost, we recommend that you carefully consider your requirements when searching for a Tankless Gas Water Heaters. Simply make a short list of your requirements. This simple task will lead you to simplifying your purchasing process. Then you will be able to know your prioroties which is the most important thing.

Budget vs Pricing

Before you decide to buy anything, one of the most important issue to think about is budget. Your desired product can be asked any amount of price by it’s seller and producer. That depends on different expences like raw material purchasing, manufacturing, transportation, operational costs and their brand value playes a huge role there. You need to be prepared to spent the higher amount of money if you demand for the higher quality in your product. Budget is so important for this cause. This is almost a universal truth and your Tankless Gas Water Heaters also fall into it.

There is a popular proverb in our society, “Cut your coat, according to your cloth”. First of all, you can find out those products on the internet which you actually want. Look carefully their features and prices. With your deep observation, make a proper comparison among them and select one that you need. Now make a question inward your mind that you are really financially capable enough to purchase that specific Tankless Gas Water Heaters or not? If the answer is yes, then go for it. You may think about the second best option if your answer is no.

Select the Best Brand

Because of our emotional attachments, we are frequently predisposed toward certain brands. This practice yields positive results at times and negative results at other times. However, there is no way to argue with the concept of relying on well-known brands. Because having enough cash in your pocket makes making decisions half as easy. But one thing remains, if you are not 100% sure that your brand of choice makes the best product that you are seeking for. So you have to be very carefull when you are choosing any product if it is the right product from right brand.

People are divided into two groups. One is fully reliant on a single brand, while the other seems unconcerned. All he requires is the appropriate goods for the price he is paying. May be we are not aware of the category that you belong to.However, there are a few pointers that may be useful to both of you when it comes to selecting the correct brand for the right product.


  • Make sure in this case that you are well-versed in the brand.

  • What people are saying about this brand.

  • What is the average rating for that brand’s specific product?

  • Contrast the features with those of competitors.

  • Does these features meet your necessities?


Analyze the Features Section.

Whether you buy it online or offline, the first thing you should check is while buying is the features of Tankless Gas Water Heaters. This is the best way to know about a product and get a clear concept. You will be able to understand, that product will match with your requirements or not.

The features section also helps us in swiftly identifying the differences with others. Then, using the features, you can compare it to similar products. If you do so, it will be much easier to reach to the final decision because you will be able to understand about the quality here.

Consider the benefits and drawbacks.

Every item has its own set of advantages and pitfalls. It is our job to thoroughly inspect them before purchasing them. So, stay cool, and find out the drawbacks which you demanded from that Tankless Gas Water Heaters. Maybe some other manufacturer made the perfect one for you. Just don’t be too lazy to compare your options to theirs before making your final decision.

Pros and Cons sections can be found on most websites. Take your time reading that part. For asking more you can contact them via email or phone.

Quality and performance

Color, Style, Performance, Materials, and, most importantly, Durability are all factors that contribute to quality. When you are buying anything, be carefull to check those quality related issues. We think you are actually paying the money for this. Do you think this Tankless Gas Water Heaters is worthy enough against the investment you did? It completely depends on the quality that you are going to experience.

Know About Warranty and Return Policies

A lot of manufacturers are making products. A good amount of them are maintaining high quality as well. To make us known about those products, they make also creative advertisements. Everything is fine. But then arrives the matter of Warranty and After Sales Service. For many, it’s really a big deal and it is quite able to make a big difference.

Don’t forget to check the facts like warranty, guarantee, and obviously the return policy if there any. Nobody can claim that nothing will happen, no matter what the quality of that product is. Nothing lasts forever. But a minimum return of value you can expect from the Tankless Gas Water Heaters you are going to pay for. So, be careful about checking policies. You may get some companies who are so clever that they try to make people puzzled with their obscure and mystical policies. In that case, don’t hesitate to contact with their representative and ask about what you want to know.

Checking FAQs and Customer Reviews makes your job easier.

If you want to save your time precisely, then checking FAQ anwers and customer reviews can be utile for you. There are few common questions people asked before and they are answered as well is called the Frequently Asked Questions or FAQ. On the other hand, you will get a real life experience through the customer reviews in which they share their sotries about the product.

If you want to get a clear idea of both, checking out those two things are must. You may find there such informations which might not come in your mind to ask if you didn’t go through. You will be able to decide whether this Tankless Gas Water Heaters will come handy or not without any hesitaton.

Final Thought

One last word, don’t forget to consider the price you are paying for the Tankless Gas Water Heaters is logical enough against the value it is providing to you. Have you been able to gratified with that? Can you be able to fullfill your demands with that? That’s the thing that should get the most importance we guess.

Hope you have enojoyed this whole article which was actually a buying guide that will lead you to buy the best Tankless Gas Water Heaters. All the efforts we put here will get success when you will find this even a little bit of useful for you. At the end of the day, your satisfaction matters most to us.

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