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8 Best Gas Tankless Water Heater Reviews

Discover the top-rated gas tankless water heaters, offering efficient, on-demand hot water and eco-friendly features.

Gas tankless water heaters have emerged as a game-changing innovation in residential and commercial water heating systems.

These innovative appliances are designed to provide on-demand hot water, eliminating the need for bulky storage tanks and delivering a continuous flow of hot water whenever needed.

With many gas tankless water heaters saturating the market, selecting the perfect one can be intimidating.

This comprehensive guide will explore the best gas tankless water heaters available today, diving into their unique features.

Check out the in-depth “Buying Guide” if you want to know which factors we have considered while shortlisting these models.

Best Gas Tankless Water Heater Table

Best Gas Tankless Water Heater Fuel TypeMax Power OutputWarrantyBuy Now
Rinnai V65iN Water HeaterNatural Gas150000 BTU/Hr10 Year LongCheck On Amazon
GASLAND Water HeaterPropane41000 BTU/Hr1 Year LongCheck On Amazon
Eccotemp Tankless Water HeaterNatural Gas75000 BTU/Hr2 Year LongCheck On Amazon
Camplux Water HeaterNatural Gas82000 BTU/Hr1 Year LongCheck On Amazon
Rinnai RL94 Water HeaterNatural Gas180000 BTU/Hr10 Year LongCheck On Amazon
Takagi Water HeaterNatural Gas199000 BTU/Hr15 Year LongCheck On Amazon
RecPro RV Tankless Water HeaterPropane42000 BTU/Hr1 Year LongCheck On Amazon
CAMPLUX LIFE Water HeaterPropane41000 BTU/Hr1 Year longCheck On Amazon

Best Gas Tankless Water Heater Reviews

1. Rinnai V65iN Water Heater

rinnai 1The first product on our list is from Rinnai which is immensely popular for making best of water heaters in various types and sizes. And their V65iN gas tankless water heater is no exception.

It boasts a compact and space-efficient design, making it the perfect fit for a wide range of spaces. Its size is comparable to a small suitcase, yet it can provide a remarkable 6.5 Gallons Per Minute (GPM) of hot water, allowing you to run up to five fixtures simultaneously.

Rinnai’s V65iN Tankless Hot Water Heater is engineered with non-condensing technology, heating water only when necessary to conserve energy. This innovative design ensures that you will enjoy hot water precisely when you need it while minimizing energy costs.

With an exceptional Uniform Energy Factor (UEF) rating, this unit not only delivers consistent performance but also saves you money on power and water bills. Additionally, Rinnai’s commitment to quality is evident in the V65iN’s construction. Each unit is individually tested for quality before shipping, ensuring reliability and longevity.

The enhanced scale detection feature helps prevent long-term damage to the unit, further extending its lifespan. Plus, Rinnai offers a comprehensive warranty package, including a 15-year guarantee for the heat exchanger, a 5-year warranty for labour, and a 1-year warranty for parts.

Customer Verdict: According to users, the heater efficiently provided hot water on-demand, even during peak usage times, and its compact design saved valuable space. However, they did encounter one drawback. They found that professional installation was indeed necessary, as attempting a DIY installation proved challenging.

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2. GASLAND Water Heater

GASLAND1GASLAND Outdoors BE158 Tankless Water Heater is a perfect solution for hot water needs in a variety of settings, from RVs and cabins to camping trips and more.

It packs a punch with power output of 41,000 BTU/Hr. It can provide hot water quickly, with a temperature rise of up to 109.4 (43) at its highest point and 55.4 (13) at its lowest, all while delivering a flow rate of 1.58 gallons per minute (GPM). This unit excels even under low water pressure conditions, needing just 3.6 PSI to start.

This tankless water heater runs on a standard 20 lb. liquid propane tank and features an electronic ignition powered by two D-cell batteries, ensuring hassle-free operation. The bright LED digital screen displays the temperature readout, preventing scalding by ensuring your water is not too hot or too cold. Additionally, the BE158 comes with a 5-foot On/Off switch shower head, making it easy to control the water flow.

With CSA certification, this unit adheres to Canadian and US safety standards. GASLAND Outdoors stands behind the quality of their product with a 1-year warranty against manufacturing defects and a commitment to provide lifetime customer support.

Customer Verdict – Several users were satisfied with this product after installing in their camping trips and RVs. But they noticed a slight drawback that the LED digital screen, while helpful, could be challenging to read in bright sunlight, making it slightly inconvenient when adjusting the water temperature outdoors. Also, it is not suitable for residential purposes.

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3. Eccotemp Water Heater

ecotempThe Eccotemp i12-NG Tankless Water Heater is your ideal solution for a reliable, efficient, and affordable hot water supply for your entire home.

It delivers hot water at a rate of 3 Gallons Per Minute (GPM). It activates only when needed, eliminating the need for a pilot light, and significantly reducing energy consumption. This means you will have hot water precisely when you need it, without wasting energy on heating and storing water.

It  features a tempered glass front panel and user-friendly LED display controls, the Eccotemp i12-NG seamlessly blends into any indoor space. It not only provides exceptional functionality but also adds a touch of elegance to your surroundings.

This water heater features temperature controls, ensuring that you can enjoy hot water at your desired temperature. It also includes an energy-saving mode to help reduce operating costs. For added safety, the child lock technology prevents accidental adjustments by curious little hands.

It utilizes Natural Gas as fuel, which not only helps reduce your energy bills but also benefits the environment. With CSA certification, you can trust its quality and safety for indoor use. Plus, the manufacturer backs it with a 2-year warranty on the heat exchanger, providing you with peace of mind.

Customer Verdict: Several users have purchased this product and shared their feedback. As per their experience, they were impressed by its energy efficiency, sleek design, and the convenience of on-demand hot water. But they found that acquiring the 4″ venting required for installation, while affordable, added an extra step to the setup process.

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4. Camplux Water Heater

CAMPLUX 1Camplux brings you the perfect blend of style, efficiency, and affordability with the Instant Gas Tankless Water Heater.

This gas tankless water heater is engineered for high heating efficiency, boasting a remarkable rating of up to 98.99%. Thanks to its oxygen-free copper heat exchanger and v-type stainless steel burner, you can experience hot water in just 3 seconds. So, it is quick, efficient, and reliable.

delivers a substantial 3.18 Gallons Per Minute (GPM) of instant hot water. This means you can run 2-3 points of hot water simultaneously, making it ideal for busy bathrooms and kitchens. With Camplux, you can enjoy steady temperature control within ±2 , ensuring that your water is always at the perfect temperature.

This water heater is built to last, thanks to the world’s most advanced technology. It comes with a 3-year warranty on the oxygen-free copper exchanger and a 1-year warranty on other parts, providing you with peace of mind.

Installation is a breeze with standard 1/2″ NPT water fittings and gas inlets. The package even includes a 2.3″ horizontal vent pipe for quick setup. Control the water temperature effortlessly with the LED touch screen featuring Fahrenheit digital display. It is modern, user-friendly, and efficient.

The Camplux tankless water heater boasts a trendy design with a unique black glassy front panel. It is not only functional but also adds a touch of modern elegance to your space. It comes with safety features like dry combustion, flame failure detection, anti-freezing protection, and overheating protection.

Customer Verdict: Users were impressed with its efficiency and the precise temperature control it offered, ensuring they never had to endure a cold shower again. However, they did encounter a minor drawback during installation. They found that acquiring the required 4″ venting for the setup, while not a significant issue, added an extra step to the process.

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5. Rinnai RL94 Water Heater

rinnai2Rinnai RL94IN Tankless Hot Water Heater – your premium solution for a continuous supply of hot water, ideal for larger families and households with high-demand hot water needs.

It stands out as a powerful gas tankless water heater, capable of delivering an impressive flow rate of 9.8 Gallons Per Minute (GPM). This means you can run up to six fixtures simultaneously without worrying about running out of hot water. With a power output of 180,000 BTU/Hr, it is one of the most powerful options available, ensuring you have hot water exactly when you need it.

One of the standout features of this water heater is its built-in Wi-Fi connectivity. You can remotely control your water heater, adjust settings, and even use voice commands for added convenience. This advanced technology enhances your overall experience and makes managing your hot water supply a breeze.

Rinnai’s tankless water heaters are renowned for their durability, lasting up to twice as long as traditional water heaters. They are designed to save energy by heating water only when needed, reducing your utility bills significantly. With an Energy Star rating and an energy factor of 0.82, you will enjoy both cost savings and environmental benefits.

The RL94IN also features Rinnai’s Circ-Logic technology, offering recirculation patterns tailored to your habits, ensuring hot water is always available when you need it. They are designed to save energy by heating water only when needed, reducing your utility bills significantly. With an Energy Star rating and an energy factor of 0.82, you will enjoy both cost savings and environmental benefits.

Despite its impressive performance, the RL94IN maintains a compact design that fits neatly on your wall, freeing up valuable space in your home. Rinnai backs the RL94IN with a residential warranty package, including a 12-year guarantee for the heat exchanger, a 5-year warranty for labor, and a 1-year warranty for parts.

Customer Verdict: Users were impressed with advanced and premium features of this product like voice control and Wi-Fi connectivity. However, they have mentioned that, setting up dedicated venting for the exhaust gases required some extra effort and expertise.

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6. Takagi Water Heater

TAKAGIIf you want to upgrade your home’s hot water system with a top-tier solution that meets all your needs, then Takagi T-H3-DV-N water heater is the right solution.

This tankless water heater features a primary heat exchanger made from commercial-grade copper alloy. This material offers 25 times better heat transfer than stainless steel, ensuring efficient and powerful performance. With a maximum power output of 199,000 BTU/Hr and an impressive water flow rate of 10 Gallons Per Minute (GPM), it’s suitable for larger families and even commercial applications.

With the T-H3-DV-N, you can enjoy an endless supply of hot water whenever you need it. Say goodbye to waiting for the water to heat up and hello to on-demand usage. This tankless water heater is designed to deliver hot water precisely when you need it, providing convenience and efficiency.

This tankless water heater is equipped with computerized safety features, eliminating the need for a pilot light, and ensuring worry-free operation. Safety features include freeze protection, overheat protection, surge protection, and troubleshooting diagnostic codes, providing peace of mind for you and your family.

The T-H3-DV-N sets itself apart by being an environmentally conscious choice. It complies with the 2012 SCAQMD Rule 1146.2 for Ultra-Low NOx Emissions, making it one of the most eco-friendly options available. By conserving energy and reusing heat, it burns less natural gas, reducing both your utility bills and your carbon footprint.

Takagi stands behind the T-H3-DV-N with a 15-year warranty on the heat exchanger, demonstrating their confidence in the product’s durability and reliability.

Customer Verdict: Users were delighted with this product as it has energy-efficient design and the fact that it complied with Ultra-Low NOx emissions regulations, contributing to a greener environment. But they did mention that the installation process was a bit more complex than they have expected, particularly when it came to setting up the condensing system.

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7. RecPro Water Heater

recproUpgrade your RV experience with the RecPro RV Tankless Water Heater – the perfect solution for on-demand hot water, enhanced safety features, and a hassle-free experience.

It is powered by LP (Propane), making it a reliable and efficient choice for heating water in your RV. This fuel type ensures you have a readily available source of energy to produce hot water on-demand, whether you are camping in the wilderness or parked at a campground.

With a temperature range of 95°F to 123°F, this tankless water heater allows you to customize your water temperature to suit your preferences. The applicable water pressure for this RV water heater is quite versatile, ranging from 14.5 to 116 PSI. This broad range ensures compatibility with various water supply systems, giving you flexibility when it comes to installation and usage.

With a BTU rating of 42,000, this tankless water heater offers efficient heating capabilities, providing a consistent and ample supply of hot water for your RV needs. This energy-efficient design ensures that your RV’s electrical system will not be overloaded, allowing you to enjoy hot water without draining your battery or overtaxing your power supply.

The RecPro RV Tankless Water Heater features forced exhaust, wind resistance, and a microcomputer-controlled ignition system. The computer ensures safe and efficient heating as water flows through the unit. Plus, it provides fault codes for quick and easy diagnosis of any issues that may arise.

Customer Verdict: They have praised the unit for delivering hot water on-demand, eliminating the need to wait for a water tank to warm up, and ensuring a steady stream of hot water for showers and dishwashing. But they found that the installation process was a bit more complicated than he expected, especially when setting up the exhaust system.

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8. CAMPLUX ENJOY Water Heater

campluxLast product on our list of the best gas tankless water heaters is from CAMPLUX LIFE STORE. It can comfortably support 3-4 outlet points, ensuring that your entire family has access to hot water whenever they need it.

It offers a seamless hot water solution for your home with a generous capacity of 6.86 gallons per minute (GPM). This high-capacity natural gas tankless water heater is designed to meet the hot water demands of a family, providing a continuous and on-demand supply of hot water.

In addition to its impressive performance, this natural gas water heater is committed to energy efficiency and environmental protection. With a maximum power output of 180,000 BTU/hour, it activates with a high energy factor of 0.82 when using natural gas, helping you save energy and reduce your utility bills. Its low NOx emission levels, averaging just 9.5 ppm, contribute to environmental conservation.

This tankless water heater is CSA certified in both the United States and Canada, ensuring that it meets rigorous safety and performance standards. It incorporates advanced technology to deliver superior safety and durability, giving you peace of mind.

The package includes a digital remote control with a 3.3-foot cable, allowing you convenient control over the water flow without the need to be near the unit. Additionally, it is easy to install as well. To top it all off, CAMPLUX LIFE places a strong emphasis on customer service, offering 24-hour customer support to make your experience as easy and fast as possible.

Customer Verdict: Most of the feedback from the customers has been positive. And they were particularly impressed with the energy-efficiency of the water heater. But there is a minor drawback with the remote control’s cable length.

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How To Choose The Best Gas Tankless Water Heater?

Whether you are looking to replace an old unit or install one for the first time, making the right choice is crucial. In this comprehensive buying guide, we will walk you through the essential factors to consider when shopping for the best gas tankless water heater to meet your specific needs.

1. Fuel Type

To begin your search for the perfect water heater, one of the initial decisions you will need to make is whether to opt for a Propane or Natural Gas model for your home. When comparing the two, both Propane and Natural Gas are excellent fuel choices. However, there are some key distinctions to consider.

  • Natural Gas typically holds an edge in terms of cost-effectiveness, as it tends to be slightly more affordable than Propane. Furthermore, it boasts a greener profile, making it the more environmentally friendly option.
  • Conversely, Propane burns at a slower rate compared to Natural Gas, which means you will not need to purchase it as frequently as you would with Natural Gas.

This divergence in burn rates often leads to the preference for Propane in portable water heaters, while household-focused gas water heaters predominantly rely on Natural Gas.

The good news is that many water heater manufacturers offer both Propane and Natural Gas models, providing you with the flexibility to select the fuel source that best aligns with your preferences and requirements.

2. Max Power Output

Next up, you should check the max power output of the gas to know how powerful it is and how quickly it can heat up water for you. Generally, the heat combustion rate of gas water heaters is measured in BTUs/Hr.

The BTU output is determined by several factors, including the temperature of your groundwater, peak hot water demand, and the water heater’s uniform energy factor (UEF).

You can calculate it using a simple formula: BTU per gallon to raise groundwater 120 degrees Fahrenheit x peak hot-water demand (gpm) x 60 minutes ÷ UEF = BTU output.

In regions with warmer groundwater (southern U.S.), you will need around 400 to 500 BTUs per gallon, while colder regions (central to northern U.S.) require 550 to 650 BTUs per gallon. To find your fixtures’ flow rate, you can check their labels or time how long it takes to fill a quart of hot water and calculate gallons per minute (gpm).

Keep in mind that residential gas heaters max out at 199,000 BTUs. If you require more, you may need multiple units or explore alternative water heater options.

3. Water Flow Rate

The water flow rate is pivotal role in determining their performance. Measured in terms of GPM (gallons per minute), it indicates how many gallons of water the heater can heat in a single minute.

Typically, water heaters with higher power outputs can deliver hot water at a faster flow rate. For households with larger families or higher hot water demands, it is advisable to opt for a water heater that offers a flow rate ranging from 5 to 10 GPM.

For context, a standard showerhead usually provides a water flow rate of approximately 1.5 GPM. Therefore, with a water heater boasting a flow rate of 5-10 GPM, you can simultaneously use multiple showers and faucets without experiencing a drop in hot water supply.

However, if you are in search of portable gas water heater solutions for an RV trailer, it is essential to note that they typically have lower power and can efficiently serve only 1-2 people at a time.

4. Energy Efficiency

Energy efficiency is a critical consideration when choosing a water heater. It is measured by the Energy Factor (EF) rating, with higher values indicating better efficiency. Opting for a highly efficient unit benefits you in two ways. Firstly, it translates to long-term cost savings, as the heater consumes less energy to heat water. Secondly, it contributes to a smaller environmental footprint by reducing energy consumption and greenhouse gas emissions.

5. Installation Costs

Do not overlook the expenses associated with installation when choosing a water heater. Installation costs may encompass adjustments to gas lines, ventilation requirements, and electrical work. It is often advisable to enlist professional installation services, not only for safety reasons but also to ensure optimal performance and compliance with local building codes. While these upfront costs are essential to factor in, they are a worthwhile investment in the long-term efficiency and reliability of your water heating system.

6. Safety Features

When selecting a water heater, prioritize models equipped with essential safety features. These may include flame failure devices, which shut off the gas supply if the flame goes out, preventing gas leaks. Overheat protection safeguards against excessively high temperatures, reducing the risk of scalding or damage to the unit. Freeze protection is vital in colder climates, preventing the unit from freezing and potentially bursting. These safety features not only protect your investment but also provide peace of mind, ensuring your water heating system operates securely and reliably.

7. User-Friendly Controls

Opting for water heaters with user-friendly controls enhances your overall experience. Look for units featuring intuitive interfaces, digital displays, and remote-control options. These amenities simplify temperature adjustments, troubleshooting, and monitoring, making it easier to customize your hot water supply to your preferences. Remote control capabilities enable convenient adjustments from your smartphone or tablet, ensuring you have hot water precisely when you need it. User-friendly controls not only boost convenience but also improve the efficiency and usability of your water heater.

8. Warranty

Warranty coverage is a crucial factor to consider when investing in a water heater, given its long-term utility. Prioritize renowned and reputable brands, as they typically offer superior post-purchase support.

Many of the water heater models featured in our list include generous warranty packages. This ensures that in the event of any issues, you can have them efficiently repaired at no additional cost. In essence, opting for well-established brands and units with solid warranty coverage provides you with added assurance, safeguarding your investment and ensuring lasting performance and reliability.

Water Heater – FAQs

1. How does a gas tankless water heater work?

Ans: Gas tankless water heaters heat water on demand as it flows through the unit, eliminating the need for a storage tank. When you turn on a hot water tap, cold water travels through the heater, where a gas burner or electric element heats it instantly before delivering it to your faucet.

2. What are the advantages of gas tankless water heaters over traditional tank heaters?

Ans: Gas tankless water heaters are more energy-efficient, provide endless hot water, take up less space, and have a longer lifespan compared to traditional tank water heaters.

3. Can I replace my existing tank water heater with a gas tankless unit?

Ans: Yes, it is possible to replace a conventional tank water heater with a gas tankless unit, but it may require adjustments to the gas line, venting, and electrical connections. Professional installation is recommended.

4. What is the typical lifespan of a gas tankless water heater?

Ans: Gas tankless water heaters typically have a longer lifespan (up to 20 years) compared to traditional tank water heaters (around 10-15 years) when properly maintained.

5. Are there any rebates or incentives available for installing a gas tankless water heater?

Ans: In some areas, there may be energy-efficiency incentives or rebates for installing gas tankless water heaters. Check with your local utility or government programs for potential savings.

6. Do gas tankless water heaters work during power outages?

Ans: Gas tankless water heaters require electricity for ignition and control functions. However, some models come with battery backup options to operate during power outages. Alternatively, you can consider a whole-home generator for uninterrupted hot water supply.

7. What is the difference between outdoor and indoor gas tankless water heaters?

Ans: Outdoor units are designed to be installed outside the home and vent directly to the exterior. Indoor units are installed inside and require proper venting to the outside. The choice depends on available installation space and local climate conditions.

8. Is it possible to install gas tankless water heater at high altitudes?

Ans: Yes, but gas tankless water heaters typically require adjustments or special considerations for installation at high altitudes due to lower air pressure. Consult the manufacturer’s guidelines for altitude-specific installations.

9. Are there any noise concerns with gas tankless water heaters?

Ans: Gas tankless water heaters can generate noise, particularly during ignition and heating. However, many models come with noise-reduction features. The noise level varies between units, so consider this when selecting a model.

10. Do gas tankless water heaters require a water softener?

Ans: Whether you need a water softener depends on your water quality. Hard water with high mineral content can lead to scale buildup, affecting the heater’s efficiency. A water softener may be recommended in such cases.

11. Can I install multiple gas tankless water heaters in my home?

Ans: Yes, if your hot water demand is exceptionally high, you can install multiple units in parallel to meet your needs. Consult with a professional to determine the best configuration.

12. What are the potential venting options for gas tankless water heaters?

Ans: Venting options include direct vent (through a wall), power vent (with a fan), and concentric vent (a single pipe for both intake and exhaust). The choice depends on your installation space and local building codes.

13. Are there any special requirements for gas tankless water heater maintenance?

Ans: Maintenance typically includes flushing the unit to remove mineral deposits and checking for leaks. Consult the manufacturer’s maintenance guidelines and consider scheduling professional maintenance annually.

14. Can I use a gas tankless water heater for radiant floor heating?

Ans: Some gas tankless water heaters are designed to support radiant floor heating systems. Check the specifications of the unit to ensure compatibility with your heating needs.

15. Do gas tankless water heaters require a dedicated gas line?

Ans: Gas tankless water heaters often require a dedicated gas line with the appropriate size to ensure consistent performance. Consult with a professional to determine the necessary gas line specifications.


That’s it, this was the list of all the best gas tankless water heaters that are available in the market right now. We have tried to mention almost all kinds of water heaters in the list, meant for indoor and outdoor usage so that every reader can find a suitable option for themselves.

Moreover, with detailed descriptions along with the pros and cons of each water heater, you will be able to easily compare them and pick the best one for you. In case you are getting confused to pick one for you, feel free to pick one from our personal recommendations:

  • First of all, the Rinnai Water Heater is one of the best options as it’s highly power-efficient and delivers a max power output of 150000 BTU/Hr using Natural Gas. Moreover, since it delivers hot water at a rate of 6.3 GPM, it’s perfectly ideal for a family of 3-5 members.
  • On the other hand, if you are looking for an affordable option, Eccotemp Water Heater works using Natural Gas and delivers a high power output of 75,000 BTUs/Hr. In fact, it delivers water at a rate of 3 GPM continuously and comes with a warranty of 2 year long.
  • In case you are looking for a portable option, the GASLAND Water heater uses Propane and delivers 41000 BTU/Hr. Although the water flow rate is 1.58 GPM, it comes with its own shower head attached that can be directly used for bathing, whenever you are out traveling long distances.

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