Looking for a reliable 40-gallon liquid propane water heater? The Rheem models deliver efficiency and performance for your hot water needs.
The Rheem 72-40-2 240V / 4500W 40 Gallon Electric Water Heater is perfect for households needing a steady hot water supply. With its impressive energy efficiency, this model reduces utility bills while providing ample hot water for daily use.
For those seeking versatility, the Rheem RTG-70DVLP-3 High Efficiency Non-Condensing Indoor Tankless Liquid Propane Water Heater offers an impressive 7.0 GPM flow rate, making it ideal for larger homes. Similarly, the Rheem High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater boasts an 8.4 GPM flow rate, ensuring you never run out of hot water.
In this full review, we will explore these models’ features and benefits, helping you choose the perfect water heater for your needs.


Rheem 40 Gallon Electric Water Heater
Rheem 72-40-2 240V / 4500W 40 Gallon Electric Water Heater: 40 gallons, Rheemglas lined tank, R-Foam insulation, 2-year warranty.
Benefits
- Provides hot water for multiple fixtures simultaneously.
- Energy-efficient with automatic temperature control thermostat.
- Durable anode rod protects against corrosion, extending the lifespan.
Drawbacks
- Requires professional installation which can add to the overall cost.
- Not suitable for very small spaces due to its size.
The Rheem 72-40-2 is an excellent choice for households needing a reliable and efficient water heating solution. It holds up to 40 gallons, ensuring you have enough hot water for showers, laundry, and dishwashing. The Rheemglas lined tank and R-Foam insulation contribute to its energy efficiency, helping to lower utility bills. The automatic temperature control thermostat is user-friendly and ensures consistent heating, making it convenient for daily use.
However, potential buyers should note that this water heater requires professional installation, which may increase upfront costs. Additionally, its size may not fit well in very small spaces, limiting its suitability for compact homes or apartments.
This water heater is a practical pick for medium to large households looking for a dependable hot water source.
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Rheem High Efficiency Liquid Propane Water Heater
Rheem RTG-70DVLP-3 High Efficiency Non-Condensing Indoor Tankless Liquid Propane Water Heater: 7.0 GPM, liquid propane, 12-year warranty.
Benefits
- Provides continuous hot water for multiple applications, ensuring comfort during showers and dishwashing.
- High efficiency saves on energy costs by operating only when hot water is needed.
- Water-saving setting conserves up to 1,100 gallons of water annually.
- Hot-start programming minimizes cold-water bursts, enhancing user satisfaction.
- LeakGuard technology protects your home from potential water damage by detecting leaks.
Drawbacks
- Installation can be complex and may require professional assistance.
- Higher upfront cost compared to traditional water heaters.
A practical pick for large households or anyone seeking efficient hot water solutions.
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Rheem High Efficiency Outdoor Tankless Water Heater
Rheem High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater: 8.4 GPM, liquid propane, 2-year warranty.
Benefits
- Provides continuous hot water for multiple applications, ensuring comfort during simultaneous use.
- Energy-efficient design saves on costs by operating only when hot water is needed.
- Saves up to 1,100 gallons of water annually with its water-saving setting.
- Compact size, 19% smaller and 22% lighter than previous models, allowing for easy installation in tight spaces.
- Hot-start programming prevents cold-water bursts, maintaining a consistent temperature.
Drawbacks
- Requires professional installation, which can add to initial costs.
- No option for indoor installation, limiting placement flexibility.
A practical pick for homeowners seeking efficiency and space-saving solutions.
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Rheem Liquid Propane Tankless Water Heater
Rheem Liquid Propane Condensing Tankless Water Heater: 17-11/16” wide, 120,000 BTUs, 1-year labor warranty, 15-year heat exchanger warranty, 5-year parts warranty.
Benefits
- Flow rate of 0.4 – 6.8 GPM provides on-demand hot water for various household needs.
- Temperature settings range from 100 to 140°F allow for customizable hot water experiences.
- Electric ignition ensures reliable startup without the need for a pilot light.
Drawbacks
- Installation can be complex and may require professional assistance.
- Higher upfront cost compared to traditional water heaters.
A practical pick for small spaces and energy-conscious users, the Rheem tankless water heater is ideal for those seeking efficiency and convenience. Its compact design fits well in tight areas while delivering sufficient hot water for multiple outlets simultaneously. The adjustable temperature settings make it versatile for different needs, whether for a shower or washing dishes. However, potential buyers should consider installation complexity and the initial investment. Overall, this unit is a solid choice for anyone looking to upgrade their hot water system.
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Ranein Tankless Propane Water Heater 4.3 GPM
Ranein Propane Gas Tankless Water Heater: 12” long, ABS plastic, 2-year warranty.
Benefits
- Holds 4.3 GPM of hot water without waiting.
Drawbacks
- No dishwasher-safe parts.
The Ranein Propane Gas Tankless Water Heater is an efficient solution for households needing continuous hot water. With a powerful heating capacity of 100,000 BTU, it can deliver up to 4.3 gallons per minute, making it ideal for multiple supply points like bathrooms and kitchens. The four seasons function automatically adjusts the water temperature based on seasonal changes, ensuring comfort year-round. Its kitchen function sets a default temperature of 100°F, perfect for cooking and cleaning. Additionally, the bathtub function allows for adjustable output quantities, enhancing user control.
One of the standout features of this heater is its on-demand capability, eliminating the 30-minute wait associated with traditional tank water heaters. This means you can enjoy unlimited hot water whenever you need it. Furthermore, the included exhaust pipe saves you from additional costs, while the oxygen-free copper water tank reduces heat loss and energy consumption.
However, it’s important to note that there are no dishwasher-safe parts, which may be a drawback for some users. Overall, this water heater is a practical pick for small spaces looking to maximize efficiency without sacrificing performance.
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Faq about 40 Gallon Liquid Propane Water Heater:
1: What is a 40 gallon liquid propane water heater?
A 40 gallon liquid propane water heater is a storage tank water heater that uses propane gas to heat water, providing a supply of hot water for residential use.
2: How does a liquid propane water heater work?
It works by burning propane gas to heat water in a tank. The heated water rises to the top, while cooler water fills the bottom of the tank, ensuring a continuous supply of hot water.
3: What are the benefits of using a liquid propane water heater?
Benefits include faster heating times, lower operating costs compared to electric heaters, and the ability to work in areas without electricity.
4: How long does a 40 gallon liquid propane water heater last?
Typically, a well-maintained 40 gallon liquid propane water heater can last 10 to 15 years.
5: What maintenance is required for a liquid propane water heater?
Regular maintenance includes flushing the tank annually, checking the anode rod, and ensuring proper ventilation for safety.
6: Can I install a 40 gallon liquid propane water heater myself?
While DIY installation is possible, it is recommended to hire a professional for safety and compliance with local codes.
Conclusion
Both the Rheem 40 Gallon Electric Water Heater and the Rheem High Efficiency Liquid Propane Water Heater exemplify superior engineering and efficiency in water heating solutions. The electric variant offers remarkable energy savings and consistent performance, making it ideal for households seeking reliability and cost-effectiveness.
Conversely, the liquid propane model stands out for its rapid heating capabilities and eco-friendliness, appealing to those prioritizing sustainability without compromising on performance. Together, these products reflect a commitment to innovation and user satisfaction, catering to diverse consumer needs in the water heating market.





