If you're looking for a reliable and efficient water heating solution for your home, a gas water heater can be a great option to consider. With a 40-gallon capacity, you can have plenty of hot water for your needs, without worrying about running out. However, with so many options available in the market, it can be overwhelming to decide which one is the best for you.

Before investing in a gas water heater, there are several factors to consider. Firstly, check the Energy Factor (EF) rating. The higher the rating, the more efficient the water heater is, and the less energy it will consume. Secondly, consider the size of your household and water consumption needs. A 40-gallon capacity may be sufficient for a small household or apartment, but a larger home may require a higher-capacity water heater. Lastly, pay attention to the warranty and maintenance requirements to ensure maximum lifespan and avoid costly repairs.

If you've made it this far, you're probably wondering which gas water heater we recommend for a 40-gallon capacity. But before we make any product recommendations, let's take a moment to ask ourselves a few questions. Do you want a water heater that is easy to install and maintain? Are you looking for a budget-friendly option, or are you willing to pay more for a high-end product with advanced features? By answering these questions, you'll be better equipped to make an informed decision that best suits your needs and budget.

10 Best Gas Water Heater 40 Gallon

# Product Image Product Name Product Notes Check Price
1
It is ideal for indoor, high-demand hot water needs such as showers and multiple faucets.
2
This product is ideal for providing instant hot water at a constant temperature indoors using natural gas.
3
Ideal for providing instant hot water for outdoor use with high flow rate and high heating capacity.
4
This electric water heater is ideal for heating large volumes of water quickly and efficiently in residential or commercial settings.
5
This product is ideal for providing hot water in a residential setting with high efficiency and safety features.
6
This natural gas water heater is ideal for residential use with powerful 42K BTU heating and efficient power vent system.
7
This product is ideal for indoor installation and provides instant hot water with a 3.6 GPM flow rate and 80,000 BTU.
8
Ideal for providing hot water for small to medium households or commercial spaces with moderate heating demands.
9
Ideal for providing hot water quickly and efficiently using propane gas in homes or commercial buildings.
10
This product is ideal for residential use, providing high efficiency and hot water supply in a tall model.
It is ideal for indoor, high-demand hot water needs such as showers and multiple faucets.
This product is ideal for providing instant hot water at a constant temperature indoors using natural gas.
Ideal for providing instant hot water for outdoor use with high flow rate and high heating capacity.
This electric water heater is ideal for heating large volumes of water quickly and efficiently in residential or commercial settings.
This product is ideal for providing hot water in a residential setting with high efficiency and safety features.
This natural gas water heater is ideal for residential use with powerful 42K BTU heating and efficient power vent system.
This product is ideal for indoor installation and provides instant hot water with a 3.6 GPM flow rate and 80,000 BTU.
Ideal for providing hot water for small to medium households or commercial spaces with moderate heating demands.
Ideal for providing hot water quickly and efficiently using propane gas in homes or commercial buildings.
This product is ideal for residential use, providing high efficiency and hot water supply in a tall model.

1. Instagas 170: Natural Gas Tankless Water Heater

For those in need of a reliable water heating solution, the FOGATTI Tankless Water Heater is an excellent option. The product comes with a recommendation that all installations be done by a licensed professional in compliance with local building and plumbing codes.

Thanks to its tankless design, users can enjoy hot water on demand without having to wait for preheating, and with a high heating capacity of 170,000 BTU and maximum flow rate of 7.5 GPM, it is suitable for 3-4 outlet points, making it ideal for families. Additionally, the FOGATTI Tankless Water Heater boasts a UEF over 0.81, which means that it has a high energy conversion rate that effectively reduces energy loss.

This water heater is CSA certified in both the United States and Canada, offering customers superior safety and durability. It also adopts the world's most advanced technology to ensure reliability and longevity.

The built-in forced exhaust fan at the bottom of the unit ensures stable combustion and eliminates the influence of external wind, while the compact design makes installation a breeze.

The FOGATTI Tankless Water Heater also comes with a 30-day free replacement policy, as well as a 5-year warranty on the heat exchanger and a 2-year warranty on other parts. It is important to note that labor costs are extra after the initial 30 days.

2. Instantflow Gas Water Heater For Steady Hot Water

When looking for a reliable and efficient hot water heater, the Tankless Instant Hot Water Heater is a great option to consider. This product has many features that make it stand out from other water heaters on the market.

One of the main benefits of this water heater is that it is tankless, which means there is no need to preheat the water before using it. As soon as you turn on the tap, the water starts flowing at your desired temperature. This makes it convenient for those who need hot water on demand.

The high sensitive touch LED display is another great feature of this product. It comes with a smart digital LED display that has a high-definition large screen. The temperature can be freely adjusted between 30℃-65℃, making it easy to find the perfect temperature for your needs.

Safety is also a top priority with this water heater. It is upgraded with 12 protection methods to ensure your safety, such as dry burning protection, over 65℃(149 °F) protection, and leakage protection. It is important to note that 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 to prevent the exchanger or water pipe from freezing and swelling.

This hot water heater is also energy and money-saving. It adjusts power input based on flow rate and temp setting in real-time. It has summer/winter 2 modes to save up to 60% on your natural gas costs. This makes it a great choice for those who want to save money on their utility bills.

The Tankless Instant Hot Water Heater is made with high-quality materials such as brushed stainless steel, which has high-temperature resistance and corrosion resistance. It also has a built-in oxygen-free copper water tank, which ensures a long service time. However, it is important to note that this product must be installed with a ventilation and smoke exhaust pipe for normal use.

It is also important to note that this product does not have a serial number. If you are not familiar with how to install a water heater, it is recommended that you seek professional installation or choose a different product.

3. Fogatti White Gas Tankless Water Heater

For those seeking a reliable and efficient water heating solution, it is highly recommended that the installation of this unit be done in compliance with local building and plumbing codes, and by a licensed professional.

This tankless water heater is designed to provide hot water on demand, eliminating the need for preheating and ensuring unlimited usage. Its high heating capacity of 180,000 BTU and maximum flow rate of 8.1 GPM make it suitable for 3-5 outlet points, offering a convenient solution for the entire family to enjoy.

With a UEF of over 0.81, the unit boasts a high energy conversion rate, which can effectively reduce energy loss. Additionally, it has been certified by CSA in both the United States and Canada, ensuring excellence in quality.

Constructed using the world's most advanced technology, this water heater offers superior safety and durability. Its built-in forced exhaust fan located at the bottom ensures stable combustion and eliminates the influence of external wind, providing reliable and consistent performance.

The compact design of this unit makes it easy to install in any space. Plus, with FOGATTI's 30-day free replacement policy and 5-year warranty on the heat exchanger and 2-year warranty on other parts, customers can enjoy peace of mind knowing they are investing in a quality product. Please note that any labor costs incurred after 30 days are not included in the warranty.

4. Rheem 72-40-2 240v / 4500w 40 Gallon Electric Water Heater

The Rheemglas lined tank is a high-quality product that boasts superior durability and reliability. Its sturdy construction ensures that it can withstand years of use without showing signs of wear and tear. The tank is lined with Rheemglas, a special material that provides an extra layer of protection against corrosion and damage.

The R-Foam insulation is another standout feature of this product. It provides excellent insulation against heat loss, which helps to keep your water warm for longer periods of time. This means that you can enjoy hot showers and baths without having to worry about running out of hot water.

The anode rod is an essential component of the Rheemglas lined tank. It is designed to protect the tank against corrosion, which can cause leaks and other damage over time. The anode rod works by attracting corrosive elements in the water, which then corrode the rod instead of the tank itself. This helps to extend the lifespan of the tank and ensures that it remains in good condition for years to come.

The automatic temperature control thermostat is a convenient feature that allows you to set the temperature of your water to your desired level. This ensures that you can enjoy comfortable and consistent water temperatures, regardless of the weather outside.

Finally, the direct immersion heating element is a powerful heating component that ensures that your water heats up quickly and efficiently. This means that you can enjoy hot water whenever you need it, without having to wait for it to heat up.

5. Defender Lp Gas Water Heater – 40 Gal.

Looking for a reliable and efficient water heater for your household? Look no further than this 40-gallon propane water heater designed for households with 2-3 people. With a BTU input of 36000 and an energy factor of 0.62, this water heater is sure to provide a steady supply of hot water to meet your daily needs.

Measuring at 60.125 inches in height and 20 inches in diameter, this water heater is compact yet spacious enough to hold 40 gallons of water. It boasts an impressive 1st-hour delivery of 76 gallons, ensuring that you have enough hot water for your daily needs.

This atmospheric venting water heater is designed for plumbing applications and features a 3/4-inch water connection. The vent size measures at 3 x 4 inches, while the recovery efficiency is at 80%, making it one of the most efficient water heaters in the market.

Additionally, this water heater is designed with a 6-year limited warranty on both the tank and component parts, giving you the peace of mind that it is built to last. It is also suitable for use in altitudes of up to 2000 feet above sea level.

While this water heater is not Energy Star rated, its impressive performance and efficiency are sure to impress you. So why wait? Invest in this reliable and efficient water heater today and enjoy a steady supply of hot water for years to come!

6. Rheem Power Vent Gas Water Heater – 50 Gallon

This innovative water heater utilizes indoor air for combustion, with a blower that exhausts flue gases to ensure top performance. Its exclusive air/fuel shut-off device ensures optimal safety and peace of mind. Plus, this water heater requires zero maintenance, as there is no filter to clean.

With long venting lengths up to 100 equivalent feet, this water heater is perfect for large spaces. And, with Rheum's exclusive R-Tech (registered) anode rod, the tank is protected and built to last. This anode rod provides long-lasting protection against corrosion, ensuring the longevity of the water heater.

7. Instant Mizudo Hot Water Heater – Indoor Usage

Introducing an instant hot water heater that is perfect for those seeking endless hot water supply on demand for 2-3 water points. This tankless water heater is designed to provide a comfortable bathing experience with its 3.6 GPM hot water flow and precise temperature control. Users can enjoy hot water without any temperature sandwich.

The premium design and durability of this water heater is unparalleled. It features an oxygen-free copper water tank that reduces heat loss, ensuring high efficiency and durability. Additionally, the compact design of this heater saves over 50% of available space compared to traditional tank water heaters, making it ideal for those with limited space.

This instant hot water heater is backed by the manufacturer's commitment to quality service. If you encounter any product quality problems, you can easily contact them through phone, email, or message. They will provide you with service according to the warranty policy.

Upgrade your home's hot water system with this reliable and efficient instant hot water heater. Experience endless hot water supply and a comfortable bathing experience with precise temperature control. Additionally, save space with its compact design. Trust in the durability and premium design of this water heater, and rely on the manufacturer's commitment to quality service.

8. Ao Smith 40 Gal 36,000 Btu Water Heater

Looking for a reliable and efficient water heater for your home or business? Look no further than the 40 gallon tank, equipped with a powerful 36,000 BTU gas burner and a GCR-40 standard vent.

With its generous capacity, this water heater is perfect for households or businesses that require a steady supply of hot water throughout the day. The 36,000 BTU gas burner ensures that the water heats up quickly and efficiently, so you won't have to wait long for hot water when you need it.

The GCR-40 standard vent ensures that any fumes or exhaust from the gas burner are safely and effectively vented out of your home or business, so you can enjoy peace of mind knowing that you and your family or coworkers are breathing clean air.

And with a 6 year limited tank warranty, you can rest assured that your investment is protected for years to come. So why wait? Upgrade your hot water system with the 40 gallon tank today and enjoy reliable, efficient hot water whenever you need it!

9. Tc-Home 18l Propane Gas Water Heater Tankless 4.8gpm Instant 36kw Lpg Hot Water Heater

Introducing a reliable and efficient hot water heater that will meet all your needs – the LPG Liquid Petroleum Gas (PROPANE) Water Heater. This water heater has a capacity of 18L/min (4.8Gal) and a 25-degree warm water producing rate. It is made of high-quality Cold Rolled Sheet material and has a compact design with dimensions of 13.4"(L) x5"(W) x25.6"(H) which makes it easy to install in your home.

The LPG Water Heater has a thermal input of 36KW and a working temperature range of -8-45℃. It has a temperature rise of 25℃ and a thermal efficiency of ≥80.8%. The minimum working water pressure for this water heater is 0.025MPa and it operates at a gas pressure of 2800Pa. The vent type is 4.3" Flue Duct, the gas pipe is G 1/2", and the water inlet and outlet are both G1/2''.

This water heater features an automatic ignition system and a flame failure protection device. It is a water and gas combination unit that is fitted with over-heating and pressure safeguards. Additionally, it has a 20-minute off self-timer, which helps conserve energy. The LPG Water Heater is certified by ISO 9001:2000 and weighs 8.5KG.

This water heater does not require any mains power, making it an excellent choice for off-grid living. It runs on DC3V, and the automatic electric ignition is powered by two (2) size 'D' batteries (batteries not included). There is no need for electrical hook-up or standing pilot.

Best Gas Water Heater 40 Gallon FAQs

Are there any energy-efficient options for 40-gallon gas water heaters?

Yes, there are energy-efficient options available for 40-gallon gas water heaters. The most common and efficient option is to install a tankless water heater. Tankless water heaters heat water on-demand, which means they don't store hot water in a tank, eliminating standby heat loss. This can lead to significant savings on energy bills.

Another option is to install a gas condensing water heater. This type of water heater uses a secondary heat exchanger to extract heat from the exhaust gases, increasing efficiency. It also has a storage tank, but the tank is better insulated than traditional gas water heaters, reducing standby heat loss.

Additionally, you can opt for a gas water heater with a high Energy Factor (EF) rating. The EF rating represents the efficiency of the water heater. The higher the rating, the more efficient the water heater is. A gas water heater with an EF rating of 0.67 or higher is considered energy-efficient.

In summary, there are several energy-efficient options available for 40-gallon gas water heaters, including tankless water heaters, gas condensing water heaters, and high EF rating gas water heaters.

Are there any safety concerns associated with using a 40-gallon gas water heater?

While using a 40-gallon gas water heater is generally safe, there are some potential safety concerns that homeowners should be aware of and take precautions to prevent. One of the main concerns is the risk of carbon monoxide poisoning. Gas water heaters can produce carbon monoxide, a colorless and odorless gas that can be deadly if inhaled in high concentrations. To prevent carbon monoxide buildup, it is important to ensure proper ventilation and to have the water heater inspected regularly by a professional.

Another potential safety concern is the risk of fire or explosion. Gas water heaters use a flame to heat the water, which can be dangerous if there is a gas leak or if the heater is not installed correctly. To minimize this risk, it is important to have the water heater installed by a licensed professional and to ensure that it is properly maintained.

Finally, it is important to be aware of the risk of scalding. Water heaters can produce water that is hot enough to cause serious burns, especially in young children or older adults. To prevent scalding, it is recommended to set the water heater temperature to no higher than 120 degrees Fahrenheit and to install anti-scald devices on the faucets in the home.

Can a 40-gallon gas water heater meet the hot water demands of a large family?

It depends on the specific hot water needs of the family. A 40-gallon gas water heater is generally considered to be on the smaller side for a large family household, as it may not be able to meet the hot water demands of multiple people using hot water simultaneously. However, if the family is conscious of their hot water usage and spreads out their usage throughout the day, a 40-gallon gas water heater may be sufficient. It's important to consider factors such as the number of bathrooms and appliances that require hot water, as well as the frequency of use. If the demand for hot water is consistently high, a larger capacity water heater may be necessary. Consulting with a licensed plumber can also help determine the appropriate size and type of water heater for a specific household's needs.

How do I maintain and troubleshoot my 40-gallon gas water heater?

A 40-gallon gas water heater can provide enough hot water for a small to medium-sized household. To maintain and troubleshoot your gas water heater, follow these steps:

1. Regular maintenance: Drain the tank annually to remove sediment buildup. Check the temperature and pressure relief valve and replace it if necessary. Inspect the burner and clean it if there is debris. Check the anode rod and replace it if it is corroded.

2. Check the pilot light: If the pilot light goes out, relight it according to the manufacturer's instructions. If it keeps going out, the thermocouple may need to be replaced.

3. Check the gas supply: If the burner won't light, check the gas supply valve to make sure it's open. If the gas supply is fine, the gas control valve may need to be replaced.

4. Check for leaks: If you smell gas, turn off the gas supply valve immediately. Open windows and doors to ventilate the area and call a professional to inspect the heater for leaks.

5. Call a professional: If you're unsure about any troubleshooting steps or if you suspect a more serious issue, call a licensed plumber or HVAC technician to inspect and repair the water heater.

How much should I expect to pay for a reliable 40-gallon gas water heater?

The cost of a reliable 40-gallon gas water heater can vary depending on several factors. The brand, model, and features of the water heater can all affect the price. On average, you can expect to pay anywhere from $500 to $1,000 for a high-quality and dependable 40-gallon gas water heater. However, this is just an estimate and the final cost can be higher or lower based on your specific needs and location.

It's important to keep in mind that while a cheaper water heater may seem like a good deal upfront, it may end up costing you more in the long run due to repairs or inefficiency. It's always recommended to invest in a high-quality and reliable water heater to ensure that you have access to hot water when you need it and avoid unexpected expenses. Additionally, consider consulting with a professional plumber to help you choose the best water heater for your home and budget.

What are the installation requirements for a 40-gallon gas water heater?

The installation requirements for a 40-gallon gas water heater can vary depending on the specific model and manufacturer, but there are some general guidelines that should be followed to ensure safe and efficient operation. First and foremost, the water heater should be installed in a location that allows for proper ventilation and clearance around the unit. This typically means that the water heater should be placed in a well-ventilated area, such as a utility room or garage, and should have at least 6 inches of clearance on all sides.

Additionally, the water heater should be connected to a gas supply line and have a properly installed vent pipe that allows for the safe release of exhaust gases. The water heater should also be connected to a cold water supply line and have a properly installed temperature and pressure relief valve.

It is important to note that installation requirements can vary depending on local building codes and regulations, so it is always best to consult with a licensed plumber or HVAC professional to ensure that the installation is done correctly and up to code.

What are the key features to look for in a high-quality 40-gallon gas water heater?

Choosing a high-quality 40-gallon gas water heater requires careful consideration of several key features. First, look for a model that offers energy efficiency, as this can help you save money on your utility bills over time. Look for a model that is ENERGY STAR certified, which means it meets strict energy efficiency guidelines set by the U.S. Environmental Protection Agency.

Another important feature to consider is the recovery rate of the heater. This is the rate at which the unit can heat water, so a higher recovery rate means you'll have more hot water available when you need it. Additionally, consider the size and physical dimensions of the heater to ensure it will fit in the space you have available.

You should also look for a model with a durable tank and high-quality components, as this can help ensure reliable performance over time. Finally, consider the warranty offered by the manufacturer, as this can provide peace of mind and protection in case of any defects or issues with the unit. Overall, a high-quality 40-gallon gas water heater should offer energy efficiency, reliable performance, and a long-lasting design.

What are the top brands for gas water heaters with 40-gallon tanks?

When it comes to gas water heaters with 40-gallon tanks, there are several top brands to consider. One of the most popular options is Rheem, which offers a range of high-quality gas water heaters with 40-gallon tanks. Another top brand for gas water heaters is Bradford White, which is known for its durable and reliable products. A.O. Smith is also a popular choice, with a variety of gas water heaters that are designed to be energy-efficient and long-lasting. Other brands to consider include State Industries, American Water Heaters, and Whirlpool. Ultimately, the best brand for you will depend on your specific needs and preferences, as well as your budget. It's important to do your research and compare different brands and models to find the one that is right for you.

What is the average lifespan of a 40-gallon gas water heater?

The average lifespan of a 40-gallon gas water heater can vary depending on several factors, including the quality of the unit, maintenance, usage, and water quality. However, on average, a 40-gallon gas water heater can last anywhere from 8 to 12 years. It is important to have regular maintenance performed on the unit to ensure it is functioning properly and to catch any potential issues early on. Signs that your water heater may be nearing the end of its lifespan include a decrease in water temperature, strange noises coming from the unit, leaks, and rust or corrosion on the tank. If you are experiencing any of these issues, it may be time to consider replacing your water heater. It is recommended to consult with a professional plumber to assess your specific situation and provide recommendations for the best course of action.

What is the warranty on a typical 40-gallon gas water heater?

The warranty on a typical 40-gallon gas water heater can vary depending on the manufacturer and model. However, most manufacturers offer warranties that range from 6 to 12 years. It is important to note that the warranty typically covers the tank and parts, but not the labor for installation or any damage caused by improper installation or use.

When purchasing a gas water heater, it is important to consider the warranty offered by the manufacturer and to ensure that it meets your needs and expectations. Additionally, regular maintenance and proper installation can help extend the life of your water heater and ensure that it continues to function properly throughout the warranty period and beyond. It is recommended to read the warranty carefully and to contact the manufacturer with any questions or concerns.

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