7 Best Gas Tankless Water Heaters with Two Installation Types

Are you looking for the best natural gas tankless water heaters to have access to on-demand instant hot water at your home or workplace? In this article, 7 best-selling and top gas-based tankless water heaters in the world have been introduced according to our expert analysis. The main purpose of this article is to guide customers to choose better products based on product properties, cost, performance, and other important factors. These products have been selected based on the customer’s favorable and critical reviews and the Bayesian ranking method. This article is designed to assist customers in choosing the right products and ensure the best possible decisions have been made based on various factors. We highly recommend reading this article to be able to make the most optimal and suitable purchase.

Table. Top Gas-besed Tankless Water Heaters for Residential Houses (Brief Table)

To Download a Full Detailed Table of the 7 Best Gas Tankless Water Heaters with Two Installation Types in 2024:

7 Best Gas Tankless Water Heaters with Two Installation Types in 2024

7. TCFUNDY Natural Gas Tankless Water Heater 

eBay

This tankless gas water heater features instant heating and constant temperature control. Due to its compact design, the TCFUNDY water heater saves more space compared to traditional tank water heaters and is more energy efficient. The product has a digital screen, and you can choose three different modes (eco mode, common mode, and tub mode) according to your water consumption. This gas tankless instant water heater delivers 4.23 GPM of endless hot water, offering up to 90% efficiency. The built-in high-precision thermostat ensures constant temperature and with the self-modulating temperature technology, it heats the water when needed. The product comes with an oxygen-free copper heat exchanger that ensures a long lifespan. It also ensures customers' safety since it is featured with over-temperature protection, flame-out protection, air flow pressure switch protection, and anti-freezing protection.

Table. Features of TCFUNDY Gas Tankless Hot Water Heater

Favorable Customer Reviews

1. One user praised the product’s correct advertisement and nice packaging. 

2. The customer expressed satisfaction with the product’s quality and decided to purchase from this seller again in the future.

3. The customer found the product affordable and appreciated its performance.

4. According to a positive review, this gas tankless water heater did not leak after installation and had no issues.

5. Two users appreciated the product’s delivery service and the seller’s fast shipping.

6. One customer was satisfied with the product’s overall performance and hoped it would last longer than their previous water heater.

The user expressed satisfaction with the product’s customer service and affordable price.

Critical Customer Reviews

1. Some users found the product challenging to work with and had difficulties installing the unit.

2. One customer criticized the poor water pressure, reporting it failed to deliver sufficient hot water simultaneously. 

3. Another customer criticized the quality of the product since it stopped working after a while.

6. Noritz Natural Gas Tankless Water Heater 

Walmart

The Noritz gas-based water heater has a compact design with WiFi capabilities, providing convenience for customers. It is available in both outdoor (venting not required) and indoor (direct vent) models. The product comes with an electronic ignition system. The company offers a 1-year warranty for reasonable labor, a 5-year  warranty for limited parts, and a 25-year warranty for the heat exchanger, ensuring peace of mind. The product offers instant hot water with flow rates ranging from 0.5 GPM up to 11.1 GPM.

Table. Features of Noritz Indoor/Outdoor Gas Tankless Water Heater

Favorable Customer Reviews

1. The customer stated that the product worked as advertised and their gas bill decreased by 10% per month.

2. One user noticed that they had to wait about 30-40 seconds to have hot water, but after that the temperature was consistent. 

3. Despite some issues, like loud noise, some customers were satisfied with the product’s overall performance.

4. One of the users expressed satisfaction with the water temperature provided by this water heater and appreciated its compact size. 

5. One customer highlighted the product’s durability since the unit worked properly after 6 months and provided instant hot water for the whole house. 

6. A satisfied user compared the Noritz gas tankless instant water heater with 2 large tank water heaters, describing it as a better alternative for heating the water.

The user found the temperature constant and stable regardless of the number of showers and was pleased with the product’s ability to provide water simultaneously.

Critical Customer Reviews

1. One dissatisfied user explained that the water temperature was at least 10-12 degrees lower than the settings, mentioning it did not function properly.

2. The customer found that the water was always hot and the product failed to deliver warm water. 

3. Some customers expressed disappointment and were annoyed by the loud noises that the unit made.

4. One customer reported that the flow rate was not consistent and the water kept getting cold and hot, which led to their frustration.

5. A disappointed user found that the product could not deliver hot water instantly and also the water was not very hot at 125 degrees, indicating false performance. 

6. The user expressed dissatisfaction with the product’s large size and noise level, mentioning it was louder and bigger than their previous water heater with the same brand.

7. Another disappointed customer reported that this unit could not provide hot water at a low flow rate and the water pressure should be high, which could waste water.

5. FOGATTI Natural Gas Tankless Water Heater

Amazon

The FOGATTI tankless gas water heater delivers endless hot water with a 5.1 GPM flow rate and 120000 BTU heating power. This product can provide hot water for 3-4 locations simultaneously. It comes with a copper heat exchanger and micro-flame technology with a negative pressure design, ensuring energy efficiency and quiet operation. This gas tankless water heater has been CSA-certified with advanced safety features (dry combustion protection, overheat protection, high water pressure protection, anti-freeze protection, and flame failure protection), so you will have peace of mind and make sure it is durable and safe to use.

The product includes a built-in chip that adjusts heating power and maintains water temperature within ±2℉, offering a relaxing showering experience. The FOGATTI water heater has a compact design, saving more than 50% space compared to traditional tank water heaters. You can easily install this product in corners and tight spaces in your house. The venting and piping dimensions for the FOGATTI gas-based water heater are compatible with most households. The installation is straightforward but the manufacturer recommends the assistance of a Professional for best performance. The product is available in three different heating powers, and you can also choose the style between natural gas or propane.

Table. Features of FOGATTI Gas Instant Hot Water Heater

Favorable Customer Reviews

1. One customer expressed that the unit delivered sufficient hot water and worked as supposed to.

2. The user recommended this water heater to others since it delivered hot water to two showers at the same time.

3. One of the customers expressed satisfaction with the product’s affordable price, which made them think about reordering the product.

4. Three users praised the product’s quick shipping, easy installation, and high quality. 

5. The customer noticed a $38 cost saving per month after installing the FOGATTI gas tankless water heater.

6. Some satisfied users reported that the control panel with the digital screen was easy to work with and they could easily adjust the water temperature.

7. According to one positive review, the unit provided 130-degree endless hot water in about 8 seconds.

Critical Customer Reviews

1. The user noticed that the product could not be installed in the basement after the product was delivered, and there were no warnings on the website. 

2. One customer reported that the unit worked properly for 6 months but then the flow sensor broke down 2 times, indicating poor quality.

3. Four customers criticized the poor customer service provided by the manufacturer and expressed dissatisfaction. 

4. The customer found that when the power shuts off, it must be manually turned back on, which is an irritating process. 

5. Despite the simple installation, one disappointed user reported that the FOGATTI gas water heater stopped working after a week and became useless. 

6. Another customer complained that the package lacked necessary components and that they were difficult to locate.

7. After receiving the product, one user found that this water heater was not for residential use anywhere higher than 2000' above sea level, making it useless for them.

4. Ranein Indoor Natural Gas Tankless Instant Water Heater

Amazon

Ranein

The Ranein on-demand tankless gas water heater delivers hot water with a 4.3 GPM flow rate to users. This product is ideal for simultaneous activities requiring hot water since it provides endless hot water for 2-3 water supply points. It is ideal for households’s kitchens, bathrooms, etc. This tankless water heater can automatically adjust the water output based on the seasonal water temperature changes. The default water output temperature is 100 ℉, so it is perfect for kitchen use. The product is available in two different sizes, and you can also choose the style between natural gas or propane.

Compared to water heaters with a tank, this tankless gas water heater allows you to have instant hot water without waiting. The Ranein gas tankless water heater comes with an exhaust pipe, so you do not have to spend extra money to buy it. This product’s oxygen-free copper water tank eliminates heat loss and minimizes energy consumption. The product is not recommended for large areas (over 2000 feet), and it is better to get help from a licensed professional for installation. The company provides 2 years of free service and 8 types of security protection.

Table. Features of Ranein Indoor Gas Tankless Instant Hot Water Heater

Favorable Customer Reviews

1. One of the users praised the product’s ability to deliver endless and consistent hot water and described it as a better alternative to traditional tank water heaters.

2. One customer expressed satisfaction with the product’s great performance and the seasonal mode for energy savings.

3. A satisfied user found that the Ranein gas tankless water heater could perfectly provide hot water and they could adjust the temperature range. 

4. Three customers expressed satisfaction with the straightforward installation and stated that they could easily install and use the unit.

5. According to the user’s review, the product did not have issues like leakage, bad smell, or high sound.

6. One user appreciated the product’s design and found it an excellent product for delivering a constant temperature.

7. The customer was impressed by the product’s high quality, affordable price, and small size.

Critical Customer Reviews

1. One of the customers reported that the support was via email, making the whole process challenging and irritating for the customer.

2. One user noticed that false instructions came with the Ranein water heater and they also criticized the quality. 

3. A dissatisfied user returned the product after a few days since its water flow could not meet their expectations. 

4. Despite the fast delivery and nice design, the customer reported a defect upon arrival, which left them disappointed.

5. Another customer criticized the poor water pressure, reporting it failed to deliver sufficient hot water to two bathrooms simultaneously. 

6. According to the user’s review, the product stopped working after two weeks with an error of E0.

7. One customer reported that the unit was delivered with missing parts, making the user try for over a month to return the product.

3. MIZUDO Natural Gas Tankless Water Heater

Amazon 

The MIZUDO tankless gas water heater has overheating protection and accidental flameout protection functions to avoid damage. The product delivers continuous instant hot water with up to 3.6 GMP water flow. It comes with accurate temperature control and offers durability and efficiency due to its premium oxygen-free copper structure. With this gas-based water heater, up to 50% of space could be saved, compared to tank water heaters. It also easily fits small spaces and only heats the water when needed. The product supports 3 appliances at the same time, so you can enjoy a relaxing bathing experience, while other members of your family do their daily activities like laundry, washing dishes, etc. The product is available in two different sizes, and you can also choose the style between natural gas or propane.

Table. Features of MIZUDO Gas Tankless Hot Water Heater

Favorable Customer Reviews

1. Five users encountered no issues and reported that the product worked properly, which added to their satisfaction.

2. One satisfied user mentioned that this water heater worked perfectly as a whole house unit.

3. The customer reported that the MIZUDO tankless gas water heater had a great water flow, enabling multiple and simultaneous use in the kitchen and bathroom.

4. According to the user’s experience, it was an affordable, compact, and lightweight unit. 

5. A customer praised the high quality of the product and expressed satisfaction since the unit worked for 10 months without any problems. 

6. Some users expressed satisfaction with the product’s overall performance, easy installation, and its ability to provide constant hot water.

7. Another customer described the product as very reliable, quiet, and quick to deliver hot water.

Critical Customer Reviews

1. A user found that the product worked properly in the kitchen but could not deliver consistent hot water for showering, and the water kept getting cold.

2. One customer reported that after 7 months, they noticed an E1 error and could not contact customer service since they did not respond to emails.

3. A disappointed user had a negative experience while installing the water heater due to poor instructions and reported that the venting requirement cost more than the unit. 

4. The customers criticized the quality of the product since it failed to ignite after 4 months.

5. According to three negative reviews, the capacity was not the same as advertised (4.3 GPM) and was around 2.3 GPM.

6. The customer reported that the fitting broke after 3 months because of cold water, and no replacement parts were available on the market. 

7. One of the users stated that the MIZUDO gas water heater stopped working after 3 months, and the company did not respond to the user, leading to their disappointment.

2. CAMPLUX Propane Tankless Instant Water Heater

Amazon

Camplux 

The Camplux CA318 propane tankless water heater includes an oxygen-free copper heat exchanger and v-type stainless steel burner, providing up to 98.99% heating efficiency in 3 seconds. You can use the product in the kitchen, bathroom, and other parts of your home, providing 3.18 GPM hot water for 2-3 appliances simultaneously. Installing this gas-based tankless water heater is simple and it includes a 2.3" horizontal vent pipe. This small water heater is perfect for indoor use and is ideal for small and tight spaces. The Camplux on-demand instant water heater delivers efficiency, safety, and durability as well as provides optimal water pressure. The product is available in black and white, and you can also choose the style between natural gas or propane.

Table. Features of Camplux Propane Tankless On-Demand Water Heater

Favorable Customer Reviews

1. The customer had some issues with the product but found the customer service very helpful as they replaced the product.

2. Several customers praised the Camplux tankless water heater for offering reliability and durability. 

3. The user found that it perfectly provided hot water for 2 showers and 2 sinks.

4. Five customers praised the customer service, great performance, and efficiency. 

5. One of the users expressed satisfaction with the product’s quiet operation and realized it was pretty quiet when running.

6. One customer could easily install this gas water heater and found this unit a great combination of price, quality, and features.

7. A user reported that they had endless hot water after buying this gas tankless water heater, making it a perfect device for simultaneous use.

Critical Customer Reviews

1. One of the customers criticized the product for having little water pressure and became disappointed with the product’s poor performance.

2. The user reported that their first order was defective and their second order began leaking after 4 months, indicating poor quality control.

3. Despite the easy installation, one dissatisfied user reported that after 8 months the product stopped working and failed to heat the water.

4. A user received a defective product and the replaced unit also did not work properly, which led to their dissatisfaction.

5. Some customers noticed that the water temperature was inconsistent, and despite the steady pressure, it kept changing while showering. 

6. One user complained about the temperature control and found it challenging to adjust the temperature.

The customer reported that the Camplux gas tankless water heater came damaged and hoped this would not affect the performance.

1. Rinnai V53DeN Natural Gas Tankless Hot Water Heater

Amazon

Rinnai 

The Rinnai gas-based tankless water heater provides endless hot water throughout your house and easily fits your house design due to its compact and space-efficient design. This durable water heater protects energy, heats the water when needed, and is resistant to buildup scale. It offers a high water flow rate of up to 5.3 GPM, which can serve up to four appliances simultaneously. It is better to get help from a qualified technician to install this tankless gas water heater. On the Rinnai Pro page on the website, you can locate a technician in your neighborhood.

The company offers a 10-, 5-, and 1-year residential factory warranty for the heat exchanger, labor, and other parts, respectively. The Rinnai gas tankless water heater provides you and your family with a healthy and enjoyable lifestyle. You can easily take care of dishes and laundry and have a relaxing experience while showering. This product is one of the most popular and best natural gas tankless water heaters that lasts up to twice as long as traditional water heaters with a tank since the water runs continuously through the pipes. Other models of this product are also available on the website page that you can choose according to your needs (installation type, flow rate, size, etc.).

Table. Features of Rinnai V53DeN Gas Tankless Hot Water Heater

Favorable Customer Reviews

1. Several customers were satisfied with the product’s overall performance and were thrilled with the results.

2. One user replaced this tankless water heater with a larger model and found this model more efficient and quiet.

3. Two customers with plumbing skills found the installation straightforward and highly recommended the Rinnai gas tankless water heater to others.

4. A satisfied user praised the product’s high quality and efficiency, mentioning it could deliver endless hot water at no time. 

5. Another customer appreciated the water heater’s affordable price and found it one of the most economical products on the market.

6.  According to the user’s comment, it is ideal for multiple uses, like showering and dishwashing.

7. A user expressed satisfaction with the product’s low power consumption. Another customer also had the unit for 5 years without facing issues.

Critical Customer Reviews

1. Two customers reported that the temperature controller was not included in the package and they had to spend another $150 for buying it, which was a little disappointing.

2. One user reported that the water did not heat well and kept turning off. 

3. After 14 months, the customer noticed leakage due to scale buildup and became disappointed with the product's quality.

4. The user criticized the seller's provided manual, describing it as not helpful for installation.

5. A few customers expressed dissatisfaction with the product’s customer service.

6. A used propane water heater was sent to one of the users instead of natural gas, which made them disappointed.

7. A customer reported that after two years, the Rinnai tankless water heater corroded and began leaking.

Conclusion

Gas tankless water heaters exist to provide instant hot water for customers. This article collects the top-selling, highest-rated tankless gas water heaters on the market that customers have purchased, used, and reviewed. To select the right product, you can use the above list. We have explained all their specifications and features, including wattage, voltage, flow rate, size, etc., to help you choose the most suitable product. Based on the Bayesian Ranking System, the Rinnai V53DeN Natural Gas Tankless Hot Water Heater, CAMPLUX Propane Tankless Instant Water Heater, and MIZUDO Natural Gas Tankless Water Heater are the three top gas-based tankless water heaters on the market for people who want to find the best mix of features, style, and price. If you wish to have access to instant and endless hot water, do not hesitate and purchase your water heater now! You can also buy Electric Tankless Water Heaters that are available on the market.