Frustrated with inconsistent hot water? The best 40 gallon gas water heater delivers reliable performance every time.
The Rheem 72-40-2 240V / 4500W 40 Gallon Electric Water Heater is perfect for households needing consistent hot water supply.
Plus, its compact design saves space while providing efficient heating, making it a smart choice for any home.
We tested durability, ease of use, and more to ensure it meets your needs.


Rheem 40 Gallon Electric Water Heater
Rheem 72-40-2 240V / 4500W 40 Gallon Electric Water Heater: 40 gallons capacity, Rheemglas lined tank, R-Foam insulation, 12-year warranty.
Benefits
- Efficient heating with direct immersion heating element, providing consistent hot water delivery.
- Durable design with anode rod that protects against corrosion, extending the life of the heater.
- Automatic temperature control ensures optimal performance and energy efficiency.
Drawbacks
- Installation can be complex and may require professional assistance for optimal setup.
- Not the most compact option; requires sufficient space for installation.
A practical pick for households needing reliable hot water without frequent maintenance. Ideal for those who prioritize durability and efficiency in their water heating solution.
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State Proline 40 Gallon Gas Water Heater
Proline Atmospheric Vent Series Gas Water Heater: 40-gallon capacity, 40,000 BTU heating input, 78 gallons per hour first hour rating, 0.65 uniform energy factor rating, 42 gallons per hour recovery at 90°F rise, dimensions: 58-1/4″ H x 18″ D, 12-year warranty.
Benefits
- Efficient heating: Provides 78 gallons of hot water in the first hour, ideal for busy households.
- Space-saving design: Slim profile fits into tight spaces without sacrificing performance.
- Durability: Comes with a 12-year warranty, ensuring long-term reliability.
- High recovery rate: 42 gallons per hour recovery at a 90°F rise, perfect for back-to-back showers.
Drawbacks
- Requires venting: As an atmospheric vent model, installation may be more complex compared to direct vent units.
- No digital controls: Lacks advanced features found in some modern models, which may be a drawback for tech-savvy users.
A practical pick for small spaces, the Proline Atmospheric Vent Series Gas Water Heater offers efficient hot water delivery without taking up too much room. Its robust heating capabilities and reliable construction make it a solid choice for homeowners looking to upgrade their water heating system.
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Rheem 40-Gallon Professional Water Heater
Rheem PROE40 T2 RH95 40-Gallon Professional Classic Water Heater: 40 gallons, dual 4500-watt heating elements, automatic thermostat, 12-year warranty.
Benefits
- Delivers 55 gallons of hot water in the first hour for consistent usage.
- Energy efficient with a 0.93 uniform energy factor, helping to reduce energy bills.
- Easy to maintain, ensuring long-term reliability.
Drawbacks
- Requires a 240-Volt connection for installation, which may necessitate electrical upgrades.
This water heater is ideal for households with 2 to 4 people, providing ample hot water for daily needs. Its dual heating elements ensure quick recovery rates, making it suitable for homes with multiple hot water demands. The automatic thermostat maintains your desired temperature, adding convenience to your daily routine.
However, potential buyers should note that installation may require professional assistance due to the 240-Volt requirement. Overall, the Rheem PROE40 T2 RH95 is a practical choice for those seeking a reliable and efficient hot water solution for their home.
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Ranein Tankless Gas Water Heater 4.3 GPM
Ranein Natural Gas Tankless Water Heater: 12” long, ABS plastic, 2-year warranty.
Benefits
- Instant hot water with a flow rate of 4.3 GPM.
- Four Seasons Function adjusts temperature based on seasonal changes.
- Reduces energy costs with an oxygen-free copper water tank.
- Includes exhaust pipe, saving additional costs.
Drawbacks
- No installation kit included, requires a licensed professional.
- Not recommended for elevations over 2,000 feet.
The Ranein Natural Gas Tankless Water Heater is a powerful solution for households needing reliable hot water. With a capacity of 100,000 BTU, it delivers hot water on demand without the long wait typical of traditional heaters. This model is particularly beneficial for kitchens and bathrooms, providing consistent temperatures through its Four Seasons Function. The adjustable output for bathtubs ensures you can cater to specific needs while conserving energy with its efficient design.
However, potential buyers should note that it does not come with an installation kit, necessitating professional installation, which might add to costs. Additionally, it is not suitable for high-altitude areas. Overall, the Ranein Natural Gas Tankless Water Heater is a practical pick for small spaces, offering convenience and efficiency for modern households.
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Propane Instant Hot Water Heater 4.74GPM
Propane Tankless Water Heater: 4.74GPM, 18L Indoor, stainless steel body, 2-year warranty.
Benefits
- Delivers 4.74 gallons of hot water per minute, suitable for 2-3 points of use simultaneously.
Drawbacks
- Requires proper ventilation for safe operation; installation may need a professional touch.
This propane tankless water heater offers impressive efficiency and energy-saving features, with a high-performance output of 68,000 BTU per hour. The advanced combustion technology minimizes gas consumption and reduces operational noise, making it a quiet addition to your home. The LED smart digital display allows for easy temperature adjustments from 95°F to 149°F, giving you precise control over your hot water needs.
Crafted with a stainless steel body and an oxygen-free copper water tank, this unit is designed for durability and minimal heat loss. Its compact design saves over 50% of space compared to traditional tank models, making it ideal for homes, small cabins, and remote apartments. Installation is straightforward, equipped with standard fittings and a horizontal vent pipe.
A practical pick for small spaces, this tankless water heater efficiently meets both bathroom and kitchen hot water demands without the need for an expansion tank. However, it’s essential to ensure proper ventilation during installation for safe operation.
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Faq about best 40 gallon gas water heater 12 year warranty:
1:What is a 40 gallon gas water heater?
A 40 gallon gas water heater is a storage tank water heater that holds 40 gallons of hot water, using natural gas or propane for heating.
2:Why choose a gas water heater over electric?
Gas water heaters typically heat water faster and are often more energy-efficient than electric models, especially in areas with high natural gas availability.
3:What is the benefit of a 12 year warranty?
A 12 year warranty indicates manufacturer confidence in durability and performance, covering repairs or replacements for an extended period.
4:How do I maintain a gas water heater?
Regular maintenance includes flushing the tank annually, checking the anode rod, and inspecting gas connections for leaks.
5:What factors should I consider when buying?
Consider energy efficiency ratings, recovery rate, installation space, and warranty terms when selecting a gas water heater.
6:Can I install it myself?
While some may attempt DIY installation, hiring a licensed professional is recommended to ensure safety and compliance with local codes.
7:What is the average lifespan of a gas water heater?
On average, a gas water heater lasts about 8 to 12 years, depending on usage and maintenance.
Conclusion
Both the Rheem 40 Gallon Electric Water Heater and the Proline 40 Gallon Gas Water Heater exemplify superior engineering and reliability, catering to diverse consumer needs. Rheem’s electric model stands out for its energy efficiency and advanced technology, ensuring consistent hot water supply while minimizing operational costs.
On the other hand, Proline’s gas variant offers rapid heating capabilities and robust performance, making it an ideal choice for households requiring immediate hot water access. Each product, underpinned by a commendable 12-year warranty, exemplifies durability and innovation, providing exceptional value in today’s competitive market.





