Searching for the best Best 40 Gallon Propane Water Heater from top brands like VELPAX,Ranein,APUS,Rheem, but unsure where to start? We’re here to help. After extensive research, we’ve selected the top Best 40 Gallon Propane Water Heater and also created a buying guide to assist you in choosing the right one.
We evaluated and tested numerous top-rated products to compile this list of standout Best 40 Gallon Propane Water Heater. Our top recommendation is VELPAX Best 40 Gallon Propane Water Heater because of its unmatched performance, quality, and value. However, we have more great options below if you want to explore further. Check out our buying guide as well for expert tips on selecting the ideal Best 40 Gallon Propane Water Heater to suit your needs and budget. With our research backing you, finding your perfect match will be easy.
Editor's Choice
Rheem 72-40-2 240V / 4500W 40 Gallon Electric Water Heater
Premium Pick
2025 GEN II Ranein Propane Gas Tankless Water Heater Max 5.3 GPM, 130,000 BTU Indoor On Demand
Budget Pick
2025 GEN II Ranein Propane Gas Tankless Water Heater Max 3.6 GPM, 80,000 BTU Indoor On Demand
Top 10 Best 40 Gallon Propane Water Heater
We researched and compared the top products in the Best 40 Gallon Propane Water Heater category to provide you with these recommendations.
1. Propane Tankless Water Heater, 4.74GPM 18L Indoor,Constant propane water heater,Instant Hot Propane
- Tankless Water Heater This propane 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, this unit is designed exclusively for use with propane (LPG).
- Efficient & Energy-Saving With a high-performance output of 68,000 BTU per hour, this 4.74 GPM instant propane 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 propane 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 and 149F, giving you precise control over your hot water needs.
- Easy Installation & Use This tankless propane 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.
2. 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.
3. 2025 GEN II Ranein Propane Gas Tankless Water Heater Max 5.3 GPM, 130,000 BTU Indoor On Demand
- High-Efficiency Endless Hot Water: Features max 5.3 GPM flow and 130,000 BTU output, supporting 35 taps (shower / kitchen / bar / laundry) for continuous household hot water needs.
- Steady Temperature for Comfort: Advanced tech maintains stable water temperature, auto-adjusting flow and heatno sudden changes, perfect for showers and daily use.
- More Powerful & Safer Blower: Bottom-mounted blower prevents smoke backflow; auto-adjusts speed for ample oxygen, ensuring full combustion, low noise, and longer lifespan.
- Energy-Saving to Cut Bills: Heats water on demand, reducing standby waste versus traditional tank heaterslowers utility costs and supports eco-living.
- Space-Saving for Small Areas: Compact wall-mounted gas tankless heater fits apartments, small homes, or renovationsfrees up valuable floor space.
- Save Money on Costs & Energy: Kit includes exhaust pipe (no extra purchase); internal oxygen-free copper tank cuts heat loss, fitting 1/2" NPT water and 3/4" NPT air ports.
- Professional Installation Note: Must be installed by licensed professionals per local codesnot recommended for areas over 2,000 feet elevation.
4. 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-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.
5. 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.
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. ThermoMate CZ422LP, Propane Tankless Water Heater, Up to 5 GPM 113,000 BTU, High Efficiency Instant
- [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.
8. Rheem PROE50 M2 RH95 50-Gallon Professional Classic Medium Residential Electric Water Heater, Gray;
- Provides ample hot water for households with 3-5 people or homes with 3+ bathrooms
- This water heater takes up less space than competitive models making it a great choice for replacing an existing water heater
- Reliable hot water solution from Rheem, the global leader in water heating
- Anode rod provides long-lasting tank protection
- Automatic thermostat keeps water at desired temperature
- Enhanced-flow brass drain valve
- Temperature and pressure relief valve included
- InfoCue - visible LED indicator
9. Ranein Propane 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)
10. Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater 7.0
- High-efficiency tankless gas water heater delivers up to 7.0 GPM, perfect for 23 bathroom homes with multiple hot water needs like showers and laundry.
- Powered by liquid propane with 160,000 BTUs, this durable tankless unit ensures fast, reliable hot watereven during peak household demand.
- Designed for outdoor installation, this high-efficiency liquid propane tankless gas water heater features a durable metal cabinet and supports easy wall mounting by a qualified installer.
- Hot-start programming prevents cold water bursts, making this liquid propane tankless gas water heater ideal for back-to-back showers.
- Rheem RTG tankless gas water heaters offer high-efficiency, space-saving designs with multiple models to fit any home size, fuel type, and hot water demand.
Peter
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