Best Gas Water Heater 40 Gallon Tank Short in 2025
Updated on August 2025
#1
Recommended
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- Flow rate ranges from 0.4 to 9.5 gallons per minute (GPM)
- Temperature settings adjustable from 100°F to 140°F, with a default of 120°F
- Equipped with electric ignition system
- Backed by manufacturer warranties: 1 year labor, 15 years on heat exchanger, 5 years on parts
- Dimensions: 17-11/16 inches wide
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- Flow rate ranges from 0.4 to 9.5 gallons per minute (GPM)
- Temperature settings adjustable from 100°F to 140°F, with a default of 120°F
- Equipped with electric ignition system
- Backed by manufacturer warranties: 1 year labor, 15 years on heat exchanger, 5 years on parts
- Dimensions: 17-11/16 inches wide
#2
Value for Money
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- Rheemglas lined tank for durability
- R-Foam insulation for energy efficiency
- Anode rod for enhanced corrosion protection
- Automatic temperature control for consistent performance
- Direct immersion heating element for efficient heating
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- Rheemglas lined tank for durability
- R-Foam insulation for energy efficiency
- Anode rod for enhanced corrosion protection
- Automatic temperature control for consistent performance
- Direct immersion heating element for efficient heating
#3
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- 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
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- 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
#4
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- Delivers consistent hot water at 4.7 GPM and 102,000 BTU, enough for 3-4 fixtures without waiting or cold shocks, ideal for busy households.
- Equipped with multiple safety features including boil-dry, freeze, flame-out, and overheating protections for reliable operation.
- Constructed with high-quality oxygen-free copper for 98% thermal efficiency, significantly reducing energy waste and lowering annual costs by about 30% compared to traditional systems.
- Features a 3.5-inch LED touchscreen for easy adjustments of water temperature (90°F to 140°F) and real-time monitoring of system status, with advanced diagnostic capabilities for troubleshooting.
- Compact design (21"H x 13"W x 7"D) with standard connectors for easy installation, saving valuable space compared to traditional tank models.
- Designed to withstand extreme weather with a high-speed fan for efficient exhaust, preventing issues like backdraft and flame-outs in severe conditions.
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- Delivers consistent hot water at 4.7 GPM and 102,000 BTU, enough for 3-4 fixtures without waiting or cold shocks, ideal for busy households.
- Equipped with multiple safety features including boil-dry, freeze, flame-out, and overheating protections for reliable operation.
- Constructed with high-quality oxygen-free copper for 98% thermal efficiency, significantly reducing energy waste and lowering annual costs by about 30% compared to traditional systems.
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#5
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- Heating capacity of 80,000 BTU with a hot water flow rate of 3.6 GPM, sufficient for 2-3 water supply points in a household.
- Instant hot water available on demand, eliminating the 30-minute wait typical of traditional tank heaters.
- Four temperature modes: Dish mode (100℉), Fruit mode (95℉), Elderly mode (104℉), and Infant mode (107℉) for tailored use.
- Includes exhaust pipe kit, minimizing additional expenses. Features an oxygen-free copper water tank for reduced heat loss and energy consumption, compatible with standard 1/2" NPT fittings.
- Installation should comply with local regulations and be performed by licensed professionals; not recommended for areas above 2,000 feet.
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- Heating capacity of 80,000 BTU with a hot water flow rate of 3.6 GPM, sufficient for 2-3 water supply points in a household.
- Instant hot water available on demand, eliminating the 30-minute wait typical of traditional tank heaters.
- Four temperature modes: Dish mode (100℉), Fruit mode (95℉), Elderly mode (104℉), and Infant mode (107℉) for tailored use.
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#6
25% Off
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- Provides sufficient hot water for simultaneous use in multiple applications, like showers and dishwashers
- Energy-efficient design operates only when hot water is needed
- Water-saving feature can reduce usage by up to 1,100 gallons annually
- Hot-start programming minimizes the risk of cold water bursts
- LeakGuard technology offers leak detection and prevention to protect against water damage
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- Provides sufficient hot water for simultaneous use in multiple applications, like showers and dishwashers
- Energy-efficient design operates only when hot water is needed
- Water-saving feature can reduce usage by up to 1,100 gallons annually
- Hot-start programming minimizes the risk of cold water bursts
- LeakGuard technology offers leak detection and prevention to protect against water damage
#7
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- Replaces traditional RV water heaters maintaining standard door sizes for easy installation and improved performance.
- Offers dual fuel options for rapid heating: 12,000 BTU propane and 1,440W electric, with three operational modes for faster hot water delivery.
- Compatible with older models, retaining the same opening size and supporting both gas and electric power sources for easy replacement.
- Designed with superior thermal conductivity and insulation, minimizing heat loss and optimizing energy efficiency.
- Features three adjustable temperature settings for customizable comfort, along with safety measures such as dry burn, water pressure, and overheat protection.
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- Replaces traditional RV water heaters maintaining standard door sizes for easy installation and improved performance.
- Offers dual fuel options for rapid heating: 12,000 BTU propane and 1,440W electric, with three operational modes for faster hot water delivery.
- Compatible with older models, retaining the same opening size and supporting both gas and electric power sources for easy replacement.
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#8
8% Off
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- Provides on-demand hot water with a flow rate of 4.3 GPM and 100,000 BTU, suitable for multiple fixtures simultaneously.
- Includes advanced safety features such as overheat and flame failure protection for reliable operation.
- Constructed with high-quality materials for energy efficiency, featuring adjustable heating modes to reduce energy costs.
- Compact design saves space compared to traditional water heaters, fitting easily in tight areas.
- Maintains stable water temperature within 1°F for consistent comfort during use.
- LED display allows for precise temperature adjustments and retains settings during power outages.
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- Provides on-demand hot water with a flow rate of 4.3 GPM and 100,000 BTU, suitable for multiple fixtures simultaneously.
- Includes advanced safety features such as overheat and flame failure protection for reliable operation.
- Constructed with high-quality materials for energy efficiency, featuring adjustable heating modes to reduce energy costs.
- Compact design saves space compared to traditional water heaters, fitting easily in tight areas.
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#9
5% Off
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- 18-gallon point-of-use storage water heater offers sufficient hot water for various applications, including sink washing and showers, with a factory-set temperature of 125°F, adjustable from 90°F to 150°F.
- Compact 25.5-inch low profile, designed for independent installation or as a booster with larger hot water sources, suitable for kitchens, bathrooms, RVs, boats, vacation cabins, garages, shops, and salons.
- INCOLOY-800 heating element provides better corrosion resistance and efficiency at high temperatures, leading to increased lifespan and energy savings.
- Corrosion-resistant tank coated with porcelain enamel glass enhances high-temperature and rust resistance, minimizing leaks and ensuring longevity with low maintenance.
- UL Listed safety features include ASME, ANSI, and CSA (AGA) approved T&P relief valve, independent drain port, high-temperature limit protection, and an adjustable thermostat.
- Water connection utilizes 3/4" NPT; requires 1500W at 120 Volts (AC); recommend a 15AMP circuit breaker; functions under a maximum water pressure of 150 PSI.
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- 18-gallon point-of-use storage water heater offers sufficient hot water for various applications, including sink washing and showers, with a factory-set temperature of 125°F, adjustable from 90°F to 150°F.
- Compact 25.5-inch low profile, designed for independent installation or as a booster with larger hot water sources, suitable for kitchens, bathrooms, RVs, boats, vacation cabins, garages, shops, and salons.
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#10
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- Produces continuous hot water on demand with a flow rate of 8.1 GPM and a power output of 180,000 BTU, suitable for multi-point water supply.
- Designed for outdoor installation, featuring an indoor remote control panel and a powerful DC fan to withstand challenging weather conditions.
- Maintains precise water temperature control within 1°F through advanced gas and water adjustment technology, adaptable for all seasons.
- Compact dimensions (26.2" x 17.1" x 7.1") allow for easy installation with standard fittings, requiring minimal space.
- Certified by CSA, this water heater comes with a 2-year warranty for the entire unit and a 5-year warranty for the heat exchanger, providing reliable customer support.
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- Produces continuous hot water on demand with a flow rate of 8.1 GPM and a power output of 180,000 BTU, suitable for multi-point water supply.
- Designed for outdoor installation, featuring an indoor remote control panel and a powerful DC fan to withstand challenging weather conditions.
- Maintains precise water temperature control within 1°F through advanced gas and water adjustment technology, adaptable for all seasons.
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