With so many great Best Gas Water Heaters 40 Gallon to pick from, like those from brands such as Rheem,Generic,Ranein,thermomate,Bradford White, it can be tricky for customers to decide what to buy. But after extensive research, we’ve discovered the stand-out Best Gas Water Heaters 40 Gallon currently on the market.
Our team rigorously tested numerous products available to consumers. The one that stands at the top of our list is Rheem Best Gas Water Heaters 40 Gallon, thanks to its impressive performance and features. Below you’ll find more of our top-rated picks, along with insightful analysis from our seasoned experts. Check out their thoughts before making your purchasing choice. With this guide backing your decision, you’re sure to end up with a Best Gas Water Heaters 40 Gallon you’ll love.
Editor's Choice
Rheem 72-40-2 240V / 4500W 40 Gallon Electric Water Heater
Premium Pick
Ranein Natural Gas Tankless Water Heater, Indoor Max 3.6 GPM, 80,000 BTU Instant Hot Water Heater
Budget Pick
State Proline Atmospheric Vent Series 40 Gallon Capacity 40,000 BTU Heating Input Skinny Gas Water
Top 10 Best Gas Water Heaters 40 Gallon
We researched and compared the top products in the Best Gas Water Heaters 40 Gallon category to provide you with these recommendations.
1. Rheem 72-40-2 240V / 4500W 40 Gallon Electric Water Heater
- Rheemglas lined tank
- R-Foam insulation
- Anode Rod protects against corrosion
- Automatic temperature control thermostat
- Direct immersion heating element
2. State Proline Atmospheric Vent Series 40 Gallon Capacity 40,000 BTU Heating Input Skinny Gas Water
- 78 Gallons per Hour First Hour Rating
- 0.65 Uniform Energy Factor Rating
- 42 Gallons per Hour Recovery at 90F Rise
- Dimensions: 58-1/4" H x 18" D
3. Ranein Natural Gas Tankless Water Heater with Vent Pipe, Indoor Max 4.3 GPM, 100,000 BTU Instant Hot
- Performance: The on-demand tankless water heater boasts a heating capacity of 100,000 BTU and a hot water flow rate of 4.3 gallons per minute (GPM). It can provide continuous hot water for 2-3 water supply points, making it sufficient to meet the hot water needs of a household's bathroom, kitchen, and bar area.
- Upgrade features: Four Seasons Function: Automatically adjust the water temperature output based on the seasonal water temperature changes. Kitchen Function: Default water output temperature is 100F, suitable for kitchen use. Bathtub Function: Adjustable water output quantity with a reminder when the set output quantity is reached, catering to various environmental needs.
- No Waiting Required: Unlike traditional tank water heaters, tankless water heaters eliminate the need for a 30-minute preheating wait time, allowing you to have unlimited hot water on demand.
- Save Money: The kit already includes the exhaust pipe, so you don't need to spend extra money on purchasing it separately. With an oxygen-free copper water tank, it reduces heat loss and lowers energy consumption. Applied with standard 1/2" NPT water fitting and gas inlet.
- Recommendation: We strongly advise that all installations of the device adhere to local building and plumbing regulations at the installation location, and should be carried out by licensed professionals. Not recommended for areas over 2,000 feet.
4. ThermoMate 102,000 BTU 4.7 GPM Natural Gas Tankless Water Heater, High Efficiency Instant On-Demand
- [4.7 GPM & 102,000 BTU] - The ThermoMate instant hot water heater delivers consistent hot water to 3-4 fixtures simultaneously, allowing you to have unlimited hot water on demand. No waiting time, no cold water shocks, perfect for busy households. Adopting advanced water flow sensor, the built-in chip can adjust the heating power 20,000 times per second, ensuring that the hot water within 1 fluctuations for a comfortable shower experience.
- [Safety & Reliable] - The gas tankless water heater comes standard with a range of safety features including boil-dry burning protection, Freeze protection, Flame out protection, Overheating Protection, Over temperature protection, Timeout protection, Pipe blockage protection, High-Temperature Lock Protection, Excessive Air Pressure Protection.
- [Energy Efficient & Save Money] - The heat exchanger is constructed from high-quality oxygen-free copper, providing superior thermal conductivity and corrosion resistance compared to stainless steel. It achieves a thermal efficiency of 98% (vs. 80% for stainless steel models) and boasts a uniform energy factor (UEF) of 0.81. This design reduces energy waste, lowering annual operating costs by approximately 30% versus traditional systems.
- [Smart Diagnostic Display] - Equipped with a 3.5-inch LED touchscreen, it allows you to effortlessly adjust and monitor output water temperature90F to 140Fwhile providing real-time tracking of water flow, fan operation, and flame status. Advanced error code technology enables rapid diagnosis of water heater malfunctions. The UL-certified 120V/5-foot power cord ensures continuous power supply for real-time monitoring systems.
- [Easy to Install & Save space] - The whole house tankless water heater features standard 3/4" NPT water inlet/outlet connectors, a 1/2" NPT gas inlet, a 3" OD vent, and a UL-approved 120V plug, ensuring compatibility with most households. With its compact dimensions of 21"H x 13"W x 7"D, the on-demand water heater requires less than one-third of the space occupied by traditional tank models, freeing up valuable room in your home.
- [Wind Resistant] - Engineered with a DC High-speed Fan (360Pa static pressure/3000 RPM), the system ensures high-velocity exhaust evacuation capable of withstanding Category 10 typhoon-force winds. This design eliminates safety risks such as backdraft and flameouts during extreme weather conditions.
5. Ranein Natural Gas Tankless Water Heater, Indoor Max 3.6 GPM, 80,000 BTU Instant Hot Water Heater
- Performance: The on-demand tankless water heater boasts a heating capacity of 80,000 BTU and a hot water flow rate of 3.6 gallons per minute (GPM). It can provide continuous hot water for 2-3 water supply points, making it sufficient to meet the hot water needs of a household's bathroom, kitchen, and bar area.
- No Waiting Required: Unlike traditional tank water heaters, tankless water heaters eliminate the need for a 30-minute preheating wait time, allowing you to have unlimited hot water on demand.
- Provides 4 modes: Dish mode(100), Fruit mode(95), Elderly mode(104) and Infant mode(107). More convenient for you to use.
- Save Money: The kit already includes the exhaust pipe, so you don't need to spend extra money on purchasing it separately. With an oxygen-free copper water tank, it reduces heat loss and lowers energy consumption. Applied with standard 1/2" NPT water fitting and gas inlet.
- Recommendation: We strongly advise that all installations of the device adhere to local building and plumbing regulations at the installation location, and should be carried out by licensed professionals.(Not recommended for areas over 2,000 feet)
6. Bradford White RE340T6-1NCWW Bwc 40Gal 240V
- Includes 4500 watt elements
- Non-simultaneous
- Protective magnesium anode rod - provides added protection against corrosion for long trouble-free service
- Country of Origin: United States
7. Ranein Propane Gas Tankless Water Heater with Vent Pipe, Indoor Max 4.3 GPM, 100,000 BTU Instant Hot
- Performance: The on-demand tankless water heater boasts a heating capacity of 100,000 BTU and a hot water flow rate of 4.3 gallons per minute (GPM). It can provide continuous hot water for 2-3 water supply points, making it sufficient to meet the hot water needs of a household's bathroom, kitchen, and bar area.
- Upgrade features: Four Seasons Function: Automatically adjust the water temperature output based on the seasonal water temperature changes. Kitchen Function: Default water output temperature is 100F, suitable for kitchen use. Bathtub Function: Adjustable water output quantity with a reminder when the set output quantity is reached, catering to various environmental needs.
- No Waiting Required: Unlike traditional tank water heaters, tankless water heaters eliminate the need for a 30-minute preheating wait time, allowing you to have unlimited hot water on demand.
- Save Money: The kit already includes the exhaust pipe, so you don't need to spend extra money on purchasing it separately. With an oxygen-free copper water tank, it reduces heat loss and lowers energy consumption. Applied with standard 1/2" NPT water fitting and gas inlet.
- Recommendation: We strongly advise that all installations of the device adhere to local building and plumbing regulations at the installation location, and should be carried out by licensed professionals. Not recommended for areas over 2,000 feet.
8. Rheem RTGH-95DVELN-3 Super High Efficiency Condensing Indoor Tankless Natural Gas Water Heater, 9.5
- Continuous Hot Water & Comfort When Needed Provides enough hot water for your entire house, even when using multiple applications such as a shower and dishwasher
- Save on Energy Costs Super High Efficient Water Heater only runs when needed
- Built-in EcoNet Wi-Fi Technology - Customize settings of your water heater, track energy and water usage, receive important alerts for maintenance and control temperature and recirculation settings from your phone of mobile device
- Hot-start programming keeps the water heater in a ready state, avoiding any cold-water bursts
- Leak Protection LeakGuard Leak Detection & Prevention protects your home from water damage that detects any internal leak, both large or small
9. 2025 GEN II Ranein Propane Gas Tankless Water Heater Max 3.6 GPM, 80,000 BTU Indoor On Demand
- Endless Hot Water for Home Multi-ScenesBoasts a max 3.6 GPM & 80,000 BTU for 2-3 taps (shower + kitchen sink + bar) no more hot water shortages for daily household use.
- No Sudden Temp Changes, Stable ExperienceAdvanced tech maintains steady water temperature; no sudden spikes or drops ideal for showering or bathing infants comfortably.
- Cut Down Monthly Utility BillsHeats water on-demand, cutting standby energy waste vs traditional tank heaters lowers monthly gas/electric bills & supports eco-living.
- Space-Saving for Small SpacesCompact wall-mounted model fits apartments/small homes/renovations frees up floor space while providing reliable on-demand hot water.
- One-Click Specialized Modes4 preset modes (Dish 100F/Fruit 95F/Infant 104F/Elderly 107F) no manual adjustments for different daily needs.
- Save Money on Extra Costs & EnergyKit includes exhaust pipe (no extra purchase needed); its oxygen-free copper tank cuts heat loss to lower energy use, fitting standard 1/2" NPT water & gas ports.
- Professional Installation AdviceMust be installed by licensed pros per local building/plumbing codes not recommended for areas above 2,000 feet elevation.
10. Natural Gas Tankless Water Heater,4.74GPM 18L Indoor,Instant Hot Gas water heater,Constant Natural
- Tankless Water Heater This natural gas tankless water heater features steady temperature control and multiple safety protections, including a flame failure device, anti-freeze protection, and overheating protection. It operates with just 3.6 PSI of water pressure, delivering up to 4.74 gallons of hot water per minute. With a maximum temperature rise of 149F(65C), this unit is designed exclusively for use with Natural GasLNG).
- Efficient & Energy-Saving With a high-performance output of 68,000 BTU per hour, this 4.74 GPM instant natural gas water heater provides on-demand hot water for 23 points of use simultaneously, making it ideal for bathrooms and kitchens. The advanced combustion technology minimizes gas consumption and reduces operational noise for a more efficient and quieter experience.
- Premium Quality & Durability Crafted with a stainless steel body for superior temperature and corrosion resistance, this natural gas water heater is built to last. The oxygen-free copper water tank ensures minimal heat loss and an extended service life. The LED smart digital display allows for easy temperature adjustments between 95F(35C) and 149F(65C), giving you precise control over your hot water needs.
- Easy Installation & Use This tankless natural gas water heater is designed for quick and hassle-free setup. It comes equipped with standard 1/2" NPT water fittings,gas pipe, inlet and outlet water pipe, and a 2.5" horizontal vent pipe for easy installation. For safe operation, ensure proper ventilation and install a smoke exhaust pipe as required.
- Versatile & Space-Saving This compact tankless water heater saves over 50% of space compared to traditional tank models, making it a perfect choice for homes, small cabins, and remote apartments. It efficiently meets both bathroom and kitchen hot water demands without the need for an expansion tank. Note: In cold weather, drain residual water by opening the pressure relief valve if the unit will not be used for an extended period.
Peter
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