best indoor propane tankless water heater that will surprise you
Looking for the best indoor propane tankless water heater? Experience endless hot water with efficiency and convenience!
The best indoor propane tankless water heater offers unmatched efficiency and comfort for your home. The Rinnai RX199iN provides up to 11.1 GPM, perfect for larger households, while the Ranein Propane Gas Tankless Water Heater delivers instant hot water at 4.3 GPM, ideal for smaller spaces. The Rheem RTG-70DVLP-3 combines high efficiency with a 7.0 GPM output, making it a versatile choice for various needs.
These heaters are designed for different applications, ensuring you find the right fit for your lifestyle. Whether you need a reliable source of hot water for showers or appliances, these products stand out with their unique features and energy-saving capabilities.
In this review, we will delve into the specifics of each model, highlighting their key benefits and helping you choose the perfect indoor propane tankless water heater for your home.


Rinnai RX199iN Tankless Water Heater
Rinnai RX199iN Condensing Smart Sense Tankless Water Heater: 12” long, compact design, 11.1 GPM, 199,000 BTU.
Benefits
- Provides up to 11.1 GPM, supporting multiple fixtures simultaneously.
Drawbacks
- Professional installation recommended, which may add to overall costs.
The Rinnai RX199iN is an exceptional choice for those seeking a reliable tankless water heater. Its compact size, akin to a small suitcase, makes it ideal for homes with limited space. With a powerful output of up to 11.1 GPM, it can easily handle the hot water demands of up to seven fixtures at once, ensuring that you never run out of hot water during peak usage times.
This model features a Smart Sense gas control system, allowing it to efficiently operate on either propane or natural gas. The high energy efficiency factor of UEF .98 helps reduce energy costs while providing consistent hot water. The Quick Flush feature simplifies maintenance, and the optional Controlr module offers WiFi control for added convenience.
However, potential buyers should note that professional installation is recommended, which could increase the initial investment. Additionally, some users may find the lack of DIY installation options a drawback.
Overall, the Rinnai RX199iN is a practical pick for small spaces that require efficient and reliable hot water solutions.
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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
- Provides 4.3 GPM, ensuring continuous hot water for multiple fixtures.
- 100,000 BTU heating capacity for efficient performance.
- Four Seasons Function adjusts temperature based on seasonal changes.
- Kitchen Function preset at 100°F for optimal cooking needs.
- No waiting time for hot water, unlike traditional tank heaters.
- Oxygen-free copper tank minimizes heat loss, enhancing energy efficiency.
Drawbacks
- No installation kit included, requiring professional installation for optimal performance.
- Not recommended for altitudes over 2,000 feet, limiting some users.
The Ranein Propane Gas Tankless Water Heater is an excellent choice for households needing consistent hot water without the wait. Its high flow rate and adjustable temperature functions make it versatile for kitchens and bathrooms alike. The energy-efficient design helps save on utility bills, making it a sound investment for long-term use. However, potential buyers should ensure they can meet the installation requirements and consider altitude limitations. A practical pick for small spaces.
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Rheem High Efficiency Indoor Tankless Water Heater
Rheem RTG-70DVLP-3 High Efficiency Non-Condensing Indoor Tankless Liquid Propane Water Heater: 7.0 GPM, propane-powered, 5-year warranty.
Benefits
- Provides continuous hot water for multiple applications simultaneously, ensuring comfort during showers and dishwashing.
- High efficiency reduces energy costs, as the heater activates only when hot water is needed.
- Water-saving setting can save up to 1,100 gallons of water per year, making it environmentally friendly.
- Hot-start programming eliminates cold-water bursts, providing instant hot water when required.
- LeakGuard technology offers leak detection and prevention, protecting your home from potential water damage.
Drawbacks
- Requires professional installation, which may add to the overall cost.
- Not suitable for large households that require simultaneous hot water for many fixtures.
A practical pick for energy-conscious homeowners seeking reliable hot water without the bulk of a traditional tank. Ideal for small to medium-sized homes where space and efficiency are priorities.
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Propane Tankless Water Heater 14L 3.7GPM
Tankless Water Heater Propane Gas: 14L long, metal housing, 2-year warranty.
Benefits
- Delivers 14L/min (3.7GPM) flow rate, providing instant hot water for showers and kitchen tasks.
Drawbacks
- Requires professional installation to ensure safety and compliance with local codes.
This tankless water heater is ideal for those seeking an efficient solution for hot water needs. With a powerful input of 95,540BTU, it heats water quickly without the wait associated with traditional storage heaters. The dual Fahrenheit/Celsius digital display allows for precise temperature adjustments, making it user-friendly for all household members. Safety features, including overheat protection and gas leak detection, enhance reliability and peace of mind during use.
However, the requirement for professional installation may deter some users. It’s crucial to have qualified technicians handle the complex gas piping and venting to avoid potential hazards. Additionally, the unit does not have dishwasher-safe components, which could be a minor inconvenience for maintenance.
This propane tankless water heater is a practical pick for small spaces or households needing a consistent hot water supply without the bulk of a traditional tank. Its compact design and efficient operation make it an excellent choice for indoor use, especially in apartments or smaller homes.
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Rinnai RE140iP Propane Tankless Water Heater
Rinnai RE140iP Non-Condensing Propane Tankless Water Heater: 12” long, ABS plastic, 2-year warranty.
Benefits
- Provides up to 5.3 GPM, allowing for simultaneous use across 5 fixtures without running out of hot water.
Drawbacks
- No dishwasher-safe parts, which may complicate cleaning for some users.
This compact tankless water heater is designed for indoor installation, making it an excellent choice for those with limited space. Its smart design heats water only when needed, conserving energy and enhancing efficiency. The LED screen offers service reminders and error codes, ensuring you stay informed about the unit’s performance.
The Rinnai RE140iP is ideal for small homes or apartments where space is at a premium. Its durable construction and warranty options provide peace of mind, while the professional installation recommendation ensures proper setup for optimal performance. The unit’s compact size, comparable to a small suitcase, makes it easy to fit into various locations without sacrificing functionality.
A practical pick for small spaces, this water heater delivers reliable hot water on demand, making it a suitable solution for modern living. If you’re looking for an efficient, space-saving water heater that won’t let you down, the Rinnai RE140iP is a strong contender.
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Faq about best indoor propane tankless water heater:
1:What is a propane tankless water heater?
A propane tankless water heater heats water on demand without a storage tank, providing hot water instantly and efficiently.
2:What are the benefits of using a propane tankless water heater?
Benefits include energy efficiency, endless hot water supply, space-saving design, and lower operating costs compared to traditional water heaters.
3:How do I choose the best indoor propane tankless water heater?
Consider factors like flow rate, energy efficiency rating, size, and installation requirements when selecting the best unit for your needs.
4:Are propane tankless water heaters safe for indoor use?
Yes, they are safe for indoor use when properly installed and vented according to manufacturer guidelines and local codes.
5:How much does it cost to install a propane tankless water heater?
Installation costs vary widely but typically range from $1,000 to $3,000, including the unit and labor.
6:What maintenance is required for propane tankless water heaters?
Regular maintenance includes descaling, checking the venting system, and inspecting gas connections to ensure optimal performance.
Conclusion
Rinnai RX199iN exemplifies excellence in efficiency and performance, delivering an impressive flow rate while ensuring optimal energy consumption. Its advanced technology and compact design make it a quintessential choice for modern households seeking reliability and convenience.
Conversely, the Ranein Tankless Propane Water Heater, with its robust 4.3 GPM capacity, offers remarkable hot water delivery, catering to diverse domestic needs. Both products stand out for their innovative features, promising unparalleled satisfaction in indoor heating solutions.





