Looking for some of the best Best 40 Gallon Gas Water Heater? As you may know, there are dozens of brands available in the market such as Ranein,APUS,Turbo Tank Cleaner,NOVIEEX,AES,Rheem and some come with vastly different price tags. Let us help you out here – we have handpicked the Best 40 Gallon Gas Water Heater for you.
To compile our list, we’ve researched and evaluated a range of the best-selling products on the market. We recommend Ranein Best 40 Gallon Gas Water Heater as our top pick because of its exceptional overall performance. Want to explore more options? Read on! There’s also a buying guide to help you make a wise shopping decision.
Editor's Choice
Ranein Natural Gas Tankless Water Heater with Vent Pipe, Indoor Max 4.3 GPM, 100,000 BTU Instant Hot
Budget Pick
Turbo Tank Cleaner - Water Heater Cleaning Tool, Improves Hot Water Supply, Removes Hard Water
Top 10 Best 40 Gallon Gas Water Heater
We researched and compared the top products in the Best 40 Gallon Gas Water Heater category to provide you with these recommendations.
1. 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)
2. APUS Tankless Water Heater Propane Gas, Up to 4.42 GPM, Indoor Hot Water Heater, 95,000 BTU on
- Powerful & High-Capacity: This high-performance propane tankless water heater delivers 95,000 BTU heating capacity with 4.42GPM high flow rate, featuring innovative 0.66GPM low-flow start technology. As a versatile propane tankless water heater, it meets simultaneous hot water demands for 2 showers plus 1 sink while maintaining stable temperatures even during peak usage.
- Precise & Steady: With high-precision sensors and smart CPU technology, this tankless propane water heater maintains water temperature within 1F of your desired setting (adjustable from 95F-140F). No more sudden hot/cold shocksjust perfectly steady water for showers, washing, and more, even with multiple faucets running. Enjoy worry-free comfort every time!
- Efficient & Durable: Featuring oxygen-free copper heat exchangers and innovative segmented combustion technology, this tankless water heater achieves exceptional 85%+ thermal efficiency. Designed for maximum performance, it delivers 30% greater energy savings than conventional tank water heater models.
- Compact & Space-Saving: This compact propane water heater saves space without sacrificing performance, featuring an intuitive LED touchscreen and sleek dimensions of just 20.55"H 13.27"W 5.91"D. As a tankless propane water heater, it delivers instant hot water on demand while operating at a quiet 40dBquieter than most household appliances.
- Safe & Reliable: Our reliable propane water heater includes multiple-layer safety protection and a 2-year coverage. This propane tankless water heater automatically shuts down if risks are detected, providing complete peace of mind with its instant, on-demand hot water comfort.
3. Turbo Tank Cleaner - Water Heater Cleaning Tool, Improves Hot Water Supply, Removes Hard Water
- MULTIPLE BENEFITS Extend the lifetime of your water heater, improve its efficiency, reduce your energy bill, and increase your hot water supply. This tool pays for itself in one use!
- WORKS GREAT Other flushing methods only remove small loose sediment particles where the Turbo Tank Cleaner physically breaks up the large sediment deposits collected at the bottom of the tank.
- UNIVERSAL Cleans all water heater tank types, gas and electric (not for tankless water heaters).
- CLEAR HOUSING This allows for full visibility during the sediment removal process.
- QUICK AND EASY Install through the tank's drain valve hole, no need to drain the tank, and works with any cordless drill and standard garden hose.
- DURABLE Several iterations have been made to improve the ruggedness of the tool. This includes upgrading the housing to an impact resistant polycarbonate plastic (1/28/2023).
- ENGINEERED FOR PROTECTION Features a lightweight, smooth spring agitator designed to shield the water heater's essential parts. Effective at low drill speeds, ensuring the dipping tube, heating elements, and tank lining remain unharmed.
4. Tankless Water Heater, Novieex On Demand Water Heater Natural Gas, Up to 4.3 GPM, 100,000 BTU
- Reliable Hot Water on Demand With 100,000 BTU power, this on demand water heater delivers up to 4.3 GPM instant hot water. You can comfortably run a shower, kitchen faucet, and bathroom sink simultaneouslyall without any noticeable temperature drop.
- Precise Temperature Control Enjoy consistent water temperature with a wide adjustable range from 95F to 149F, 1 temperature control . The built-in digital thermostat of the tankless water heater ensures your water stays at the desired setting, delivering comfort and safety for every shower and household task.
- High Efficiency, Lower Bills Say goodbye to the energy and electricity waste of traditional heaters that reheat water nonstop. By leveraging a selectional burner system, our tankless water heater gas precisely adjusts the flame for the water temperature. You will see a noticeable drop in your energy bills, making it an efficient and cost-effective choice.
- All-Round Security SystemOur built-in multi-protection system safeguards against gas leaks, overheating, dry-firing, and freeze damage, offering ultimate safety and comfort for families with temperature-sensitive elderly or kids with delicate skin.
- Compact & Space-SavingCompared to bulky traditional tanks, our natural gas on demand water heater is wall-mounted, saving over 50% of space and blends seamlessly into utility rooms, basements, or closets. Its sleek appearance and LED touchscreen interface allow for easy and intuitive operation.
- Usage Reminder For safe and efficient use, this indoor on demand water heater requires natural gas and professional installation by a licensed technician using 1/2" NPT fittings (Exhaust pipe included).
5. AES Industries Water Heater Blanket Jacket Insulation Non Fiberglass Fits 40 50 60 and 80 Gallon
6. 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
7. FOGATTI Natural Gas Tankless Water Heater Outdoor - Max 8.1 GPM 180,000 BTU, CSA Certified Compact
- Instant Hot Water: Say goodbye to preheating delays! FOGATTI tankless water heater delivers continuous hot water instantly, powered by 180,000 BTU and up to 8.1 GPM flow rate. Whether its for showers, sinks, or appliances, even for 3-5 outlet points, it ensures uninterrupted hot water
- Built for Outdoor Durability: Designed specifically for outdoor installation, this tankless water heater gas features a remote control panel for convenient indoor operation. The bottom-mounted fan enhances safety, durability, and lifespan by preventing smoke backflow and ensuring stable combustion, making it reliable in all seasons
- Precision Temperature Control: With advanced water servo technology and temperature sensors, the tankless gas water heater precisely adjusts water flow and gas intake to maintain a temperature difference within 1. The four-stage combustion system ensures consistent comfort, whether its a chilly winter or a hot summer
- Quick and Easy Installation: The compact design measuring 26.2 x 17.1 x 7.1 inches makes installation hassle-free. The gas tankless water heater is compatible with low water pressure from 15-150 PSI, ensuring smooth operation even in areas with weaker water pressure. Simply connect to a standard 120V AC for seamless operation
- Trusted Quality and Support: Built with a high-efficiency oxygen-free copper heat exchanger and 304 stainless steel burner, this tankless water heater gas outdoor offers exceptional durability and performance. Certified by CSA and equipped with multiple safety features, it meets the highest safety standards, ensuring reliable and secure operation
- Reliable Protection and Support: FOGATTI water heater includes 2 years of full coverage for the entire unit and 5 years of coverage for the heat exchanger. Our dedicated customer support team is ready to assist with any questions or concerns, providing peace of mind for you
- Note: Natural gas tankless water heater is equipped with active heating anti-freeze device, If enviroment temp drop below 5 or not be used for long period, drain the water inside to prevent damage. For optimal performance, recommended for use below 2000 feet altitude
8. 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.
9. ThermoMate CZ422NG Natural Gas Tankless Water Heater, Up to 5 GPM 113,000 BTU, High Efficiency
- [Max 5 GPM & 113,000 BTU] - The ThermoMate instant hot water heater can supply two showers simultaneously, each delivering 105F water at a flow rate of 2 GPM, based on an inlet water temperature of 65F. 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] - This gas tankless water heater integrates 8 protections: boil-dry, freeze, flame-out, overheating, over-temperature, pipe blockage, high-temperature lock, and excessive air pressure. Equipped with 4 ceramic heating cores, it auto-activates frost protection when temperatures hit 41F (5). The energy-smart system uses minimal electricity to generate gentle warmth, preventing pipe ice buildup without high energy costs.
- [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 powerful exhaust evacuation capable of withstanding winds from a major hurricane (Category 3 and above, >111 mph/178 km/h), eliminating safety risks like backdraft and flameouts during the most extreme weather.
10. 2025 GEN II Ranein Natural Gas Tankless Water Heater Max 3.6 GPM, 80,000 BTU Indoor On Demand
- Endless Hot Water for Home Multi-Scenes: Boasts a max 3.6 GPM and 80,000 BTU for 23 taps (shower + kitchen sink + bar)no more hot water shortages for daily household use.
- No Sudden Temp Changes, Stable Experience: Advanced tech maintains steady water temperature; no sudden spikes or dropsideal for showering or bathing infants comfortably.
- Cut Down Monthly Utility Bills: Heats water on-demand, cutting standby energy waste versus traditional tank heaterslowers monthly gas/electric bills and supports eco-living.
- Space-Saving for Small Spaces: Compact wall-mounted model fits apartments, small homes, or renovationsfrees up floor space while providing reliable on-demand hot water.
- One-Click Specialized Modes: 4 preset modes (Dish 100F / Fruit 95F / Infant 104F / Elderly 107F)no manual adjustments needed for different daily needs.
- Save Money on Extra Costs & Energy: Kit 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 and gas ports.
- Professional Installation Advice: Must be installed by licensed professionals per local building and plumbing codesnot recommended for areas above 2,000 feet elevation.
Peter
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