Best 10 Propane Tankless Water Heaters in 2025: Top Picks for Endless Hot Water

Imagine never running out of hot water during a shower, even in a bustling household or a remote cabin. Traditional tank water heaters waste space, energy, and often fail to meet high hot water demands, especially in larger homes or off-grid settings. Enter propane tankless water heater—compact, energy-efficient solutions delivering instant, endless hot water. Whether you’re upgrading your home, outfitting an RV, or setting up an outdoor kitchen, the best 10 propane tankless water heaters in 2025 offer unmatched performance. This guide provides in-depth comparisons, reviews, and insights to help you confidently choose the perfect model for your needs.

Why Choose a Propane Tankless Water Heater?

Propane tankless water heaters are a game-changer for homeowners and outdoor enthusiasts alike. Unlike traditional tank heaters, they heat water on demand, eliminating standby energy losses and providing a continuous hot water supply. Here’s why they stand out:

• Energy Efficiency: Up to 34% more efficient than tank models, saving on energy bills.
• Space-Saving Design: Compact units fit in tight spaces, ideal for small homes, RVs, or outdoor setups.
• Endless Hot Water: Perfect for large families or simultaneous use of multiple fixtures.
• Versatility: Suitable for areas without natural gas, making them ideal for rural or off-grid homes.

Key Considerations:

• Flow Rate (GPM): Determines how many fixtures can run simultaneously (e.g., 5 GPM for small homes, 10+ GPM for large ones).
• BTU Output: Higher BTUs handle colder climates or higher demand (e.g., 199,000 BTU for large homes).
• Installation: Indoor models need venting; outdoor models save indoor space.
• Energy Factor (UEF): Higher UEF (0.9+) indicates better efficiency.

Who Needs One?: Ideal for large families, off-grid cabins, RVs, camping, or outdoor kitchens/pools where reliable hot water is essential.

How We Chose the Best Propane Tankless Water Heaters

Our selection process was rigorous, ensuring only the top-performing propane tankless water heaters made the list. We:

• Analyzed Amazon Data: Reviewed customer ratings, reviews, and sales trends for real-world performance insights.
• Cross-Referenced Expert Sources: Consulted trusted sites like Forbes, Bob Vila, and This Old House for expert evaluations.
• Evaluated Key Metrics:
  • Flow Rate (GPM): Ensured models meet various household sizes.
  • BTU Output: Prioritized units with sufficient heating power.
  • Energy Efficiency (UEF): Focused on high-efficiency models to save costs.
  • Warranty and Durability: Selected models with strong warranties and robust construction.
  • Safety Features: Included units with protections like overheating and low-flow shutoffs.
  • Customer Feedback: Emphasized models with high satisfaction and minimal complaints.

This ensures our recommendations align with user needs, from large homes to portable camping setups.

Comparison Table: Top 10 Propane Tankless Water Heaters

Note: Prices are approximate, based on Amazon data as of 2025, and may vary. Check Amazon for current pricing.

Top 10 Propane Tankless Water Heaters: Detailed Reviews

1. Rinnai RX199iP Condensing Tankless Water Heater

• Product Description: The Rinnai RX199iP is a powerhouse for large households, delivering an impressive 11.1 GPM to handle multiple fixtures simultaneously, like showers, dishwashers, and washing machines. Its condensing technology maximizes efficiency by reusing exhaust heat, achieving a stellar 0.98 UEF. With Wi-Fi connectivity, you can monitor and adjust settings via a smartphone app, making it a smart choice for tech-savvy users. Its convertible design allows for indoor or outdoor installation, and the 15-year heat exchanger warranty ensures long-term reliability. This unit is Energy Star certified, offering eco-friendly performance with ultra-low NOx emissions.

Buy It From Amazon

• Price: ~$1,481.00
• Key Features and Benefits:
  • 11.1 GPM flow rate supports up to 7 fixtures, ideal for large homes.
  • 199,000 BTU output ensures consistent heating in cold climates.
  • 0.98 UEF for top-tier energy efficiency, reducing utility bills.
  • Wi-Fi-enabled for remote control and maintenance alerts.
  • Convertible venting (PVC or concentric) for flexible installation.
  • 15-year heat exchanger warranty, 5 years on parts, 1 year on labor.
• Pros:
  • Exceptional flow rate for simultaneous high-demand use.
  • Energy-efficient condensing technology saves up to 40% on energy costs.
  • Quiet operation (48 dB) for minimal noise disruption.
• Cons:
  • Higher upfront cost compared to non-condensing models.
  • Professional installation required, adding to costs (~$2,000–$3,000).
• Amazon Customer Ratings and Reviews: ~4.5/5 stars (300+ reviews); users praise its reliability and endless hot water, though some note complex installation processes.
• Why It’s a Good Choice: The Rinnai RX199iP offers unmatched performance and efficiency, making it the top choice for families needing robust, eco-friendly hot water solutions.
• Ideal Use Case: Large households (4+ people) or homes with high hot water demand (e.g., multiple showers, appliances).

2. Rinnai RL75iP Indoor Propane Tankless Water Heater

• Product Description: The Rinnai RL75iP is a compact, high-efficiency indoor unit designed for medium-sized homes. With a 7.5 GPM flow rate, it supports 2–3 simultaneous fixtures, making it perfect for families of 2–4. Its non-condensing design keeps costs lower than premium models, while still achieving a respectable 0.82 UEF. Wi-Fi compatibility allows remote temperature control, and its recirculation technology reduces hot water wait times. The unit includes diagnostic error codes for easy troubleshooting and comes with a 12-year warranty for peace of mind.

Buy It From Amazon

• Price: ~$1,032.14
• Key Features and Benefits:
  • 7.5 GPM flow rate for 2–3 fixtures (e.g., shower and sink).
  • 180,000 BTU output for reliable heating.
  • 0.82 UEF for energy savings over tank heaters.
  • Compact design (22.5″ x 14″ x 9″) fits small spaces.
  • Wi-Fi-ready for smart home integration.
  • 12-year heat exchanger warranty.
• Pros:
  • Affordable for mid-range budgets.
  • Reliable performance for medium-sized homes.
  • Easy installation with included isolation valves.
• Cons:
  • Non-condensing, less efficient than condensing models.
  • Some users report occasional error codes.
• Amazon Customer Ratings and Reviews: ~4.4/5 stars (200+ reviews); customers love its ease of use and compact size, though some mention minor error code issues.
• Why It’s a Good Choice: This unit balances cost, performance, and space efficiency, making it ideal for smaller homes or apartments.
• Ideal Use Case: Couples or small families (2–3 people) in urban/suburban homes with moderate hot water needs.

3. Camplux 5L Portable Propane Tankless Water Heater

• Product Description: The Camplux 5L is a lightweight, portable propane tankless water heater designed for outdoor adventures like camping or RVing. Weighing just 10 pounds, it features a foldable handle for easy transport and setup. With a 1.32 GPM flow rate, it’s perfect for single-fixture use, such as a shower or dishwashing. Its low 0.4 PSI activation pressure ensures operation even with low water flow, and it includes a shower head and gas regulator. Multiple safety features, like overheating and low-flow protection, make it reliable for off-grid use.

Buy It From Amazon

• Price: ~$159.99
• Key Features and Benefits:
  • 1.32 GPM for single-fixture use (e.g., camping shower).
  • 34,000 BTU output for efficient heating.
  • Low 0.4 PSI activation pressure for versatile setups.
  • Includes 5-foot shower head and gas regulator.
  • CSA-certified with anti-freeze and overheating protection.
  • 1-year warranty.
• Pros:
  • Highly portable with foldable handle.
  • Budget-friendly for outdoor enthusiasts.
  • Easy to set up with standard propane tanks.
• Cons:
  • Limited flow rate unsuitable for home use.
  • Some users report durability concerns over time.
• Amazon Customer Ratings and Reviews: ~4.2/5 stars (500+ reviews); campers praise its portability and convenience, though some note build quality issues.
• Why It’s a Good Choice: Its affordability and portability make it a top pick for outdoor enthusiasts needing reliable hot water on the go.
• Ideal Use Case: Campers, RVers, or off-grid users needing hot water for showers or small tasks.

4. GASLAND Outdoors BE158 1.58 GPM Propane Tankless Water Heater

• Product Description: The GASLAND BE158 is a portable propane tankless water heater tailored for outdoor enthusiasts, offering a 1.58 GPM flow rate for light tasks like showers or dishwashing during RV camping or hunting trips. Weighing 14.3 pounds, it’s compact and easy to carry, with a sleek design that includes an LED temperature display for precise control. Its CSA certification ensures safety with features like flame failure protection, anti-freeze drainage, and overheating safeguards. The unit connects to standard propane tanks and includes a 5-foot gas regulator and shower head for quick setup, making it a reliable choice for off-grid hot water needs.

Buy It From Amazon

• Price: ~$169.99
• Key Features and Benefits:
  • 1.58 GPM flow rate for single-fixture use (e.g., shower or sink).
  • 41,000 BTU output for efficient heating in outdoor settings.
  • LED digital display for easy temperature adjustments (86–131°F).
  • CSA-certified with multiple safety protections (flame failure, overheating, low flow).
  • Includes 5-foot shower head, gas regulator, and hose adapter.
  • 1-year warranty.
• Pros:
  • Lightweight and portable for camping or RV use.
  • Affordable price point for budget DIY-friendly setup.
  • Reliable safety features for worry-free outdoor use.
• Cons:
  • Not suitable for whole-house applications due to low flow rate.
  • Limited warranty period compared to home models.
• Amazon Customer Ratings and Reviews: ~4.3/5 stars (400+ reviews); users appreciate its portability and ease of use, though some report inconsistent heating at high altitudes.
• Why It’s a Good Choice: The GASLAND BE158 offers great value for outdoor adventurers, combining portability, safety, and reliable performance for small-scale hot water needs.
• Ideal Use Case: RV camping, hunting trips, or small off-grid cabins requiring minimal hot water.

5. Rheem RTG-70XLP-3 Outdoor Propane Tankless Water Heater

• Product Description: The Rheem RTG-70XLP-3 is a robust outdoor propane tankless water heater designed for medium-sized homes or outdoor installations like pool heating or outdoor kitchens. With a 7.0 GPM flow rate, it supports 2–3 simultaneous fixtures, delivering consistent hot water for showers, sinks, or appliances. Its non-condensing design is cost-effective, with a 0.82 UEF for moderate energy savings. The unit features a built-in leak detection system with error codes for easy maintenance and a freeze protection system for cold climates. Its 10-year warranty and durable stainless steel heat exchanger ensure long-term reliability for outdoor environments.

Buy It From Amazon

• Price: ~$804.00
• Key Features and Benefits:
  • 7.0 GPM flow rate for 2–3 fixtures.
  • 180,000 BTU output for reliable heating.
  • 0.82 UEF for energy efficiency over tank heaters.
  • Built-in leak detection and diagnostic error codes.
  • Freeze protection down to -30°F for outdoor durability.
  • 10-year heat exchanger warranty, 1-year parts.
• Pros:
  • Durable design with long warranty for outdoor use.
  • Easy installation with 3/4-inch gas and water connections.
  • Reliable performance for medium-sized households.
• Cons:
  • Non-condensing, less efficient than premium condensing models.
  • Some users report venting challenges in windy conditions.
• Amazon Customer Ratings and Reviews: ~4.3/5 stars (250+ reviews); praised for outdoor reliability and consistent hot water, though some note venting issues in exposed locations.
• Why It’s a Good Choice: This unit offers a balance of affordability, durability, and performance for homes or outdoor setups needing moderate hot water capacity.
• Ideal Use Case: Medium-sized homes (2–4 people) or outdoor applications like pool heating or outdoor kitchens.

6. Forimo 5.26 GPM Outdoor Portable Propane Tankless Water Heater

• Product Description: The Forimo 5.26 GPM propane tankless water heater is a versatile outdoor unit that bridges the gap between portable camping heaters and home-use models. With a 5.26 GPM flow rate, it can handle multiple light tasks, such as a shower and sink simultaneously, making it suitable for small homes, cabins, or outdoor activities like pet bathing or camping. Its digital display allows precise temperature control (95–149°F), and its high-efficiency combustion technology delivers a 0.88 UEF. The unit includes a shower head, gas regulator, and hose adapter, with safety features like flame-out protection and anti-freeze drainage for reliable outdoor performance.

Buy It From Amazon

• Price: ~$151.99
• Key Features and Benefits:
  • 5.26 GPM flow rate for multiple light uses.
  • 68,000 BTU output for efficient heating.
  • Digital temperature control with LED display.
  • High-efficiency combustion (0.88 UEF) for energy savings.
  • Includes shower head, gas regulator, and installation kit.
  • 1-year warranty.
• Pros:
  • Higher flow rate than most portable units.
  • Energy-efficient design reduces propane consumption.
  • Versatile for both outdoor and small home use.
• Cons:
  • Short warranty period compared to home models.
  • Not suitable for large households with high demand.
• Amazon Customer Ratings and Reviews: ~4.1/5 stars (300+ reviews); users praise its versatility and flow rate, though some report setup challenges for non-DIYers.
• Why It’s a Good Choice: Its higher flow rate and efficient design make it a great option for users needing more capacity than typical portable units.
• Ideal Use Case: Small cabins, camping, pet bathing stations, or tiny homes with moderate hot water needs.

7. Navien NPE-240A Condensing Propane Tankless Water Heater

• Product Description: The Navien NPE-240A is a premium condensing propane tankless water heater designed for large households with high hot water demands. Its 11.2 GPM flow rate supports up to 7 fixtures, ensuring no interruptions during peak usage. The exclusive ComfortFlow® system, with a built-in buffer tank and recirculation pump, eliminates “cold water sandwiches” for seamless hot water delivery. With a 0.93 UEF, dual stainless steel heat exchangers, and ultra-low NOx emissions, it’s highly efficient and eco-friendly. Wi-Fi-enabled EcoNet® technology allows remote monitoring, and a 15-year warranty offers long-term peace of mind.

Buy It From Amazon

• Price: ~$1,635.00
• Key Features and Benefits:
  • 11.2 GPM flow rate for large homes (7+ fixtures).
  • 199,900 BTU output for powerful heating.
  • 0.93 UEF with condensing technology for energy savings.
  • ComfortFlow® system prevents cold water bursts.
  • EcoNet® Wi-Fi for remote control and maintenance alerts.
  • 15-year heat exchanger warranty, 5 years parts, 1 year labor.
• Pros:
  • Eliminates cold water interruptions with recirculation.
  • High efficiency reduces energy costs significantly.
  • Durable stainless steel heat exchangers resist corrosion.
• Cons:
  • High upfront cost and complex installation (~$2,500–$3,500).
  • Slightly noisier than non-condensing models (50 dB).
• Amazon Customer Ratings and Reviews: ~4.6/5 stars (200+ reviews); highly rated for performance and efficiency, though some note high installation costs.
• Why It’s a Good Choice: Its advanced features and high capacity make it ideal for tech-savvy users and large homes needing reliable hot water.
• Ideal Use Case: Tech-forward households (4+ people) with high hot water demand (e.g., multiple showers, appliances).

8. Takagi T-H3-DV-P Condensing Propane Tankless Water Heater

• Product Description: The Takagi T-H3-DV-P is an Energy Star-certified condensing propane tankless water heater designed for eco-conscious households. With a 10 GPM flow rate, it supports 3–4 fixtures, making it suitable for medium to large homes. Its 0.95 UEF and ultra-low NOx emissions ensure top-tier efficiency and environmental friendliness. The unit features a commercial-grade copper heat exchanger for durability and includes safety features like freeze protection and overheat cut-off. Its compact design (24″ x 18″ x 9″) fits tight spaces, and a 10-year warranty provides reliability for indoor installations.

Buy It From Amazon

• Price: ~$1,563.95
• Key Features and Benefits:
  • 10 GPM flow rate for 3–4 fixtures.
  • 199,000 BTU output for consistent heating.
  • 0.95 UEF for high energy efficiency.
  • Ultra-low NOx emissions for eco-friendly operation.
  • Commercial-grade copper heat exchanger for durability.
  • 10-year heat exchanger warranty, 5 years parts.
• Pros:
  • Energy Star certification for maximum efficiency.
  • Durable components withstand hard water conditions.
  • Compact design for easy indoor installation.
• Cons:
  • Indoor-only installation limits placement options.
  • Some users report slightly noisy operation (49 dB).
• Amazon Customer Ratings and Reviews: ~4.4/5 stars (150+ reviews); praised for efficiency and reliability, though some mention noise during operation.
• Why It’s a Good Choice: Its high efficiency and eco-friendly design make it perfect for environmentally conscious buyers needing strong performance.
• Ideal Use Case: Medium to large homes (3–5 people) in eco-friendly regions with moderate to high hot water needs.

9. Noritz NR50ODNG Outdoor Propane Tankless Water Heater

• Product Description: The Noritz NR50ODNG is a compact outdoor propane tankless water heater designed for small homes or outdoor applications like pool heating. With a 5.0 GPM flow rate, it supports 1–2 fixtures, making it ideal for small households or vacation cabins. Its 0.81 UEF offers moderate energy savings, and its lightweight design (59 lbs) simplifies outdoor installation. The unit includes freeze protection down to -30°F and a high-efficiency burner for reliable performance. A 12-year heat exchanger warranty ensures durability for outdoor environments.

Buy It From Amazon

• Price: ~$644.48
• Key Features and Benefits:
  • 5.0 GPM flow rate for 1–2 fixtures.
  • 120,000 BTU output for small-scale heating.
  • 0.81 UEF for moderate energy efficiency.
  • Lightweight (59 lbs) for easy outdoor installation.
  • Freeze protection for cold climates.
  • 12-year heat exchanger warranty, 5 years parts.
• Pros:
  • Affordable for small homes or outdoor use.
  • Simple outdoor setup with minimal venting needs.
  • Reliable for low-demand applications.
• Cons:
  • Limited flow rate unsuitable for large households.
  • Non-condensing design is less efficient than premium models.
• Amazon Customer Ratings and Reviews: ~4.2/5 stars (180+ reviews); users appreciate its affordability and reliability, though some note limited capacity for multiple fixtures.
• Why It’s a Good Choice: Its low cost and durable design make it a great fit for small households or outdoor installations with minimal hot water needs.
• Ideal Use Case: Single-person homes, small apartments, or outdoor applications like pool or spa heating.

10. Onsen 3.0 Diaphragm Propane Tankless Water Heater

• Product Description: The Onsen 3.0 Diaphragm is a compact propane tankless water heater designed for RV camping, marine use, or small off-grid cabins. With a 3.0 GPM flow rate, it supports light tasks like showers or dishwashing. Its 12V pump ensures reliable operation in off-grid settings, and a dual ignition system (battery or plug-in) enhances versatility. The unit features a self-cleaning function to reduce maintenance and safety features like flame failure protection and anti-freeze drainage. Its lightweight design (15 lbs) and included accessories (shower head, regulator) make it ideal for portable hot water solutions.

Buy It From Amazon

• Price: ~$229.00
• Key Features and Benefits:
  • 3.0 GPM flow rate for single-fixture use.
  • 55,000 BTU output for efficient heating.
  • 12V pump for off-grid reliability.
  • Dual ignition (D-cell batteries or plug-in) for flexibility.
  • Self-cleaning function reduces maintenance.
  • 1-year warranty.
• Pros:
  • Compact and portable for RV or marine use.
  • Low power consumption (12V) for off-grid setups.
  • Easy setup with included shower head and regulator.
• Cons:
  • Limited flow rate unsuitable for home use.
  • Short warranty period compared to home models.
• Amazon Customer Ratings and Reviews: ~4.0/5 stars (250+ reviews); praised for RV camping reliability, though some report maintenance needs for hard water use.
• Why It’s a Good Choice: Its low power needs and portable design make it perfect for off-grid adventurers needing reliable hot water.
• Ideal Use Case: RV camping, marine applications, or small off-grid cabins with minimal hot water requirements.

Buying Guide: How to Choose the Best Propane Tankless Water Heater

Selecting the right propane tankless water heater depends on your specific needs and circumstances. Here’s what to consider:

• Flow Rate (GPM): Match the flow rate to your household size or use case. Small homes (1–2 people) need 5–7 GPM, medium homes (2–4 people) need 7–9 GPM, and large homes (4+ people) require 10+ GPM. For camping or RV use, 1–3 GPM is often sufficient.
• BTU Output: Higher BTUs (e.g., 180,000–199,000) are necessary for colder climates or high-demand households to ensure adequate heating.
• Energy Efficiency (UEF): Look for a UEF of 0.9+ for maximum energy savings, especially in condensing models like the Navien NPE-240A or Takagi T-H3-DV-P.
• Installation: Indoor models require venting (PVC for condensing, metal for non-condensing), while outdoor models like the Rheem RTG-70XLP-3 save indoor space. Professional installation costs range from $300 (portable units) to $2,800 (whole-house units).
• Warranty and Durability: Prioritize units with 10+ year heat exchanger warranties and stainless steel components for longevity, especially in hard water areas.
• Safety Features: Look for overheating protection, low-flow shutoffs, and leak detection for safe operation.
• Additional Considerations:
  • Budget vs. Long-Term Savings: High-efficiency models cost more upfront but save on propane costs over time.
  • Propane Tank Compatibility: Ensure your propane tank size supports the heater’s BTU requirements (e.g., 20-lb tanks for portable units, 100-lb+ for home units).
  • Smart Features: Wi-Fi connectivity (e.g., Rinnai RX199iP, Navien NPE-240A) offers remote control and maintenance alerts for convenience.
• Pro Tip: Use manufacturer flow rate calculators (available on Rinnai, Navien, or Rheem websites) to estimate GPM needs based on your fixtures and climate. For example, a shower uses ~2.5 GPM, a dishwasher ~1.5 GPM, and a washing machine ~2 GPM.

Installation and Maintenance Tips

• Installation Costs: Expect $300–$500 for portable units and $1,500–$2,800 for whole-house units, depending on venting and labor complexity.
• Venting Requirements: Condensing models (e.g., Navien NPE-240A) use cost-effective PVC venting; non-condensing models (e.g., Rheem RTG-70XLP-3) require metal venting, which can increase costs.
• Maintenance: Annual descaling is critical in hard water areas to prevent buildup in heat exchangers. Use a vinegar solution or commercial descaling kits (~$20–$50).
• Safety: Ensure proper ventilation to prevent carbon monoxide buildup, especially for indoor models. Hire licensed professionals for installation to comply with local codes and ensure safety.

FAQs

What is the best propane tankless water heater for a large family?
The Rinnai RX199iP or Navien NPE-240A are top choices, offering 11.1–11.2 GPM to support multiple fixtures (e.g., showers, appliances) for 4+ people.

Can propane tankless water heaters work off-grid?
Yes, portable models like the Camplux 5L or Onsen 3.0 are ideal for off-grid use, requiring only a propane tank and minimal power (e.g., D-cell batteries or 12V pump).

How much can I save with a propane tankless water heater?
They can save up to 30–40% on energy bills compared to tank heaters, especially condensing models with UEF ratings above 0.9.

What’s the difference between condensing and non-condensing propane tankless water heaters?
Condensing models (e.g., Navien NPE-240A) reuse exhaust heat for higher efficiency (0.9+ UEF), but cost more upfront. Non-condensing models (e.g., Noritz NR50ODNG) are less efficient (0.8–0.85 UEF) but more affordable.

Conclusion

Propane tankless water heaters deliver endless hot water, energy savings, and compact designs for a wide range of needs, from large households to off-grid adventures. Whether you need a high-capacity unit like the Rinnai RX199iP for a bustling family home or a portable Camplux 5L for camping, our top 10 list covers the best options for 2025. Check current Amazon prices to find the perfect model, and upgrade your hot water system today for efficiency and reliability. Have questions or need help choosing? Leave a comment below, and we’ll guide you to the ideal propane tankless water heater for your needs.