Best 10 LP Tankless Water Heaters in 2025 – Top Picks for Endless Hot Water and Energy Savings

Picture stepping into a steaming shower after a long day, only to be hit with a blast of ice-cold water because your old tank heater can’t keep up—frustrating, right? Homeowners in rural or off-grid areas relying on liquid propane (LP) often deal with inefficient tank heaters that waste energy, take up space, and run out of hot water during peak use, leading to higher bills and inconvenience. This guide curates the best 10 LP tankless water heaters, drawn from 2025 Amazon best-sellers, expert reviews from Forbes, Bob Vila, and This Old House, plus real-user feedback, to deliver endless hot water, up to 34% energy savings, and space-efficient designs. We’ll empower you with detailed specs, comparisons, and buying advice to select the ideal LP model for your home size, budget, and usage, ensuring confident, regret-free purchases.

Why LP Tankless Water Heaters Are a Game-Changer

Liquid propane (LP) tankless water heaters represent a significant upgrade from traditional tank-style units, especially for homes without natural gas access. These on-demand systems heat water instantly as it flows through the unit, eliminating the need for a storage tank that constantly reheats water and incurs standby losses. With Uniform Energy Factors (UEF) often exceeding 0.90, they can save up to 34% on energy costs compared to tanks, translating to $100–$200 annually for average households, according to the U.S. Department of Energy. Their compact, wall-mount designs free up valuable space in garages, basements, or utility closets—ideal for rural cabins or modular homes. Expect a lifespan of 20+ years with proper maintenance, far outpacing tanks’ 10–15 years. They excel at handling multiple fixtures simultaneously without temperature drops, addressing common pain points like simultaneous showers and dishwashing. For LP users, benefits include reliable performance in cold climates (with freeze protection) and compatibility with recirculation systems for near-instant hot water. Challenges like venting (indoor models require direct venting) and installation (often $1,000–$2,000 extra) are mitigated by flexible options for indoor/outdoor setups, making them a smart, future-proof choice for propane-dependent households.

How We Selected the Best LP Tankless Water Heaters

Our selection process for the best 10 LP tankless water heaters combined rigorous data analysis with hands-on insights to prioritize models that excel in real-world LP applications. We scoured 2025 Amazon listings for units with 4.5+ star ratings and 500+ reviews, focusing on LP-specific feedback from rural and off-grid users. Expert sources like Forbes Vetted, Bob Vila, and This Old House provided performance benchmarks, while forums such as Reddit’s r/askaplumber offered unfiltered user experiences on reliability and installation quirks. Key criteria included:

• Performance: Gallons per minute (GPM) flow rates of 4+ for 1–2 bathrooms; 8+ for larger homes; BTU output suited to LP’s higher energy density.
• Efficiency & Cost: UEF ratings above 0.90 for propane savings; balanced pricing ($200–$1,600) with long-term ROI calculations.
• Reliability: Low failure rates in reviews; warranties of 15+ years on heat exchangers; features like scale prevention for hard-water areas.
• Versatility: Indoor/outdoor options, recirculation compatibility, and easy LP conversion kits.
• User Focus: Emphasis on solving peak-demand issues, minimal noise, and freeze protection for variable LP setups.
  We simulated usage scenarios based on groundwater temperatures (e.g., 40°F in northern climates) and cross-verified specs against ENERGY STAR standards. This ensures our picks deliver authoritative value, helping you avoid common pitfalls like undersized units or venting mismatches.

Top 10 LP Tankless Water Heaters: In-Depth Reviews and Comparisons

1. Rheem Performance Platinum ECOH200DVELP3

• Compelling Product Description: The Rheem Performance Platinum ECOH200DVELP3 stands out as a premium indoor condensing LP tankless water heater, engineered for whole-home dominance with up to 8.4 GPM flow—enough to power three showers and a dishwasher without a hint of cold. Its smart modulation technology dynamically adjusts the burner for precise temperature control (100–140°F), while the 0.93 UEF slashes propane use by 34%, potentially saving $1,100 over 12 years per ENERGY STAR estimates. WiFi-enabled via the Rheem app, it sends maintenance alerts and supports recirculation for instant hot water, making it a hassle-free upgrade for busy families. The stainless steel heat exchanger resists corrosion, and built-in diagnostics simplify troubleshooting, ensuring years of reliable performance in LP setups.

Buy It From Amazon

• Price: ~$1,299 (subject to change).
• Key Features and Benefits:
  • 199,000 BTU max output with 0.93 UEF for superior propane efficiency.
  • WiFi connectivity for remote monitoring and control via smartphone app.
  • Built-in recirculation compatibility eliminates “cold water sandwiches.”
  • Freeze protection down to -22°F, ideal for unheated spaces.
  • Direct venting with 2–10 ft PVC/CPVC options for flexible installs.
• Pros:
  • Powers 3–4 fixtures simultaneously, even in cold groundwater.
  • 15-year heat exchanger warranty; ENERGY STAR certified for rebates.
  • Quiet operation (under 50 dB) and user-friendly LED display.
  • Easy LP conversion with included kit.
• Cons:
  • Professional installation recommended (~$1,500 total cost).
  • Higher upfront price than non-condensing models.
• Amazon Customer Ratings and Reviews: 4.6/5 from 800+ reviews; “Endless hot water for our 3-bath farm—LP bills dropped 25%, app is a game-changer!” Some users mention initial venting setup complexity but praise Rheem’s support line.
• Why It’s a Good Choice for LP Users: Optimized for propane’s clean burn, its high UEF minimizes tank refills, and smart features adapt to variable demand without waste.
• Ideal Use Case/Who Should Buy: Large families (3+ baths) in rural LP homes seeking smart, energy-saving whole-home solutions with minimal maintenance.

2. Rinnai RU199iN (LP Convertible)

• Compelling Product Description: Rinnai’s RU199iN delivers commercial-grade endurance in a sleek indoor package, effortlessly converting to LP for 11 GPM flow that handles up to five fixtures in demanding households. The Circ-Logic recirculation system preheats lines for hot water in seconds, while the 0.98 UEF—highest in its class—maximizes propane efficiency, cutting costs by up to 40% versus tanks. Built with a copper heat exchanger and low-NOx burner, it ensures eco-friendly operation compliant with strict air quality regs. Alexa integration allows voice-activated scheduling, and self-diagnostic error codes speed repairs, making it a premium pick for tech-forward off-grid living.

Buy It From Amazon

• Price: $2,066.17
• Key Features and Benefits:
  • 199,000 BTU with 0.98 UEF for unmatched energy savings on LP.
  • Indoor direct venting; supports up to 5 simultaneous outlets.
  • Built-in diagnostics and Alexa-compatible smart controls.
  • Field-convertible to LP with simple kit (included).
  • 15-year warranty on heat exchanger for long-term peace of mind.
• Pros:
  • Exceptional flow in cold climates (up to 11 GPM at 35°F rise).
  • Whisper-quiet (49 dB) and compact (23x14x11 inches).
  • Robust build tested for 20+ year lifespan.
• Cons:
  • Bulkier than entry-level units; extra $50 for full LP kit if needed.
  • App setup can be finicky initially.
• Amazon Customer Ratings and Reviews: 4.7/5 from 1,200+ reviews; “Transformed our cabin—hot water for days on LP, no more cold blasts!” Users highlight reliability but advise pro venting install.
• Why It’s a Good Choice for LP Users: Ultra-high UEF optimizes propane’s BTU density; recirculation ensures waste-free delivery.
• Ideal Use Case/Who Should Buy: Tech-savvy owners of 3+ bath homes or cabins needing premium, connected performance with high flow.

3. Noritz EZ111 (LP Version)

• Compelling Product Description: The Noritz EZ111 redefines easy LP upgrades with its plug-and-play design, delivering 8.4 GPM for mid-sized homes without the retrofit headaches. Dual stainless steel exchangers and an integrated pump maintain steady 100–140°F output during back-to-back uses, while the 0.97 UEF trims propane bills by 30%. Top-mounted connections and Bluetooth app integration slash install time by 50%, and low-NOx emissions meet California’s strict standards. With easy-access panels for DIY flushing and a 25-year heat exchanger warranty, it’s built for longevity in hard-water LP regions.

Buy It From Amazon

• Price: $4,996.88
• Key Features and Benefits:
  • 199,900 BTU with 0.97 UEF for efficient LP operation.
  • Bluetooth EZ Start app for setup, diagnostics, and temp control.
  • Integrated air pressure sensor and freeze protection to -30°F.
  • Compact (18x11x24 inches) with flexible PVC venting.
• Pros:
  • 25-year heat exchanger warranty—industry-leading durability.
  • Affordable power for 2–3 baths; low emissions for eco-compliance.
  • Quick weekend DIY install possible with app guidance.
• Cons:
  • No built-in WiFi (Bluetooth only; app optional add-on).
  • Slower ignition in sub-zero temps without preheat.
• Amazon Customer Ratings and Reviews: 4.5/5 from 600+ reviews; “EZ install in our LP cabin—endless hot water, app makes maintenance a breeze!” Some note minor pump hum but love the value.
• Why It’s a Good Choice for LP Users: Long warranty and easy LP conversion make it a low-risk, high-reward propane investment.
• Ideal Use Case/Who Should Buy: DIY-savvy homeowners in 2–3 bath homes wanting durable, value-packed performance.

4. Navien NPE-240A2 (LP)

• Compelling Product Description: Navien’s NPE-240A2 shines in high-demand scenarios with 10.1 GPM output, using ComfortFlow technology and a buffer tank to banish temperature fluctuations forever. This condensing LP unit’s 0.96 UEF delivers 34% savings on propane, while stainless components and NaviLink WiFi enable app-based monitoring of usage and errors. Ideal for large families, it cascades up to 32 units for scalability, and built-in pump ensures instant delivery—perfect for sprawling rural estates where LP lines run long.

Buy It From Amazon

• Price: ~$1,599.
• Key Features and Benefits:
  • 199,000 BTU with 0.96 UEF and 2 GPM buffer tank.
  • Built-in recirculation pump; WiFi NaviLink for remote control.
  • Dual stainless exchangers for corrosion resistance.
  • Supports 4–5 fixtures; condensate drain for efficiency.
• Pros:
  • Eliminates “cold sandwiches” with seamless multi-fixture use.
  • 15-year warranty; error codes for quick pro diagnostics.
  • High-altitude kit included for mountain LP homes.
• Cons:
  • Premium cost; requires condensate management.
  • Heavier (80 lbs) for solo installs.
• Amazon Customer Ratings and Reviews: 4.6/5 from 900+ reviews; “No more cold blasts in our 4-bath LP house—saves big on propane!” Venting noted as tricky but support responsive.
• Why It’s a Good Choice for LP Users: Recirculation and buffering optimize propane flow for zero-waste hot water.
• Ideal Use Case/Who Should Buy: Busy large households (4+ baths) prioritizing ultra-comfort and smart monitoring.

5. Eccotemp ELITE160 (LP Outdoor)

• Compelling Product Description: Built for rugged outdoor LP use, the Eccotemp ELITE160 pumps 6.8 GPM in a weatherproof shell, perfect for cabins or RVs where venting indoors isn’t feasible. Digital LCD controls fine-tune temps from 86–122°F, and flame failure sensors provide multi-layer safety. With 0.90 UEF and 160,000 BTU, it heats efficiently even in wind, supporting 2–3 fixtures without indoor plumbing overhauls—ideal for seasonal retreats.

Buy It From Amazon

• Price: ~$599.
• Key Features and Benfits:
• 160,000 BTU with 0.90 UEF; outdoor-rated to -4°F.

• • LCD display for precise temp/flow adjustments.
  • Overheat/flameout protection; 1/2-inch NPT connections.
  • Portable design with quick propane hookup.
• Pros:
  • Vent-free outdoor install saves $500+ on labor.
  • 5-year warranty; CSA-certified for US/Canada.
  • Affordable entry to tankless for mid-sized needs.
• Cons:
  • Max 6.8 GPM limits to 2–3 baths.
  • Exposed to elements (recommend rain cover).
• Amazon Customer Ratings and Reviews: 4.4/5 from 1,500+ reviews; “Game-changer for our off-grid cabin—reliable LP hot showers!” Wind sensitivity mentioned but easy fixes.
• Why It’s a Good Choice for LP Users: Ventless design leverages propane’s portability for remote, no-fuss setups.
• Ideal Use Case/Who Should Buy: Cabin/RV owners needing mid-range, budget-friendly outdoor power.

6. Takagi T-H3-DV-N (LP Convertible)

• Compelling Product Description: Takagi’s T-H3-DV-N brings versatile LP adaptability to indoor installations, offering 8 GPM flow with a modulating burner that precisely matches demand for consistent 100–140°F water. Its scale prevention system combats mineral buildup in LP-fed hard-water areas, extending the 15-year heat exchanger life, while the 0.95 UEF ensures efficient propane combustion—saving up to 30% on bills. Direct venting and anti-frost features make it robust for uninsulated spaces, and recirculation readiness delivers hot water fast, positioning it as a reliable choice for elevated or variable-climate LP homes.

Buy It From Amazon

• Price: ~$1,099.
• Key Features and Benefits:
  • 199,000 BTU with 0.95 UEF; field-convertible to LP.
  • Modulating burner for precise temp control and energy savings.
  • Built-in freeze protection and scale reduction tech.
  • Recirculation compatible; 2–10 ft venting flexibility.
• Pros:
  • 15-year warranty; high-altitude certified up to 10,000 ft.
  • Quiet (under 50 dB) and compact (21x14x10 inches).
  • Low-NOx for environmental compliance.
• Cons:
  • LP conversion kit required (simple but extra step).
  • Limited smart app integration compared to rivals.
• Amazon Customer Ratings and Reviews: 4.5/5 from 700+ reviews; “Steady LP performance at our mountain cabin—saves on propane and no scaling issues!” Users appreciate quietness but suggest pro help for conversion.
• Why It’s a Good Choice for LP Users: Modulating tech fine-tunes propane burn to avoid waste, ideal for fluctuating usage.
• Ideal Use Case/Who Should Buy: High-altitude rural homes with 2–3 baths needing durable, adaptable performance.

7. Camplux 16L Outdoor Propane

• Compelling Product Description: The Camplux 16L is a tough, portable outdoor LP tankless heater tailored for on-the-go needs, delivering 4.2 GPM for quick showers or sink use with 118,000 BTU output. Battery ignition sparks up instantly without electricity, and multi-safety features—like overheat shutoff and flame sensors—guard against mishaps. At 0.85 UEF, it’s efficient for its class, minimizing propane draw in remote spots, while the carry handle and weather-resistant build suit camping or tiny homes. Simple dial controls make it user-friendly, providing a budget gateway to tankless convenience.

Buy It From Amazon

• Price: ~$199.
• Key Features and Benefits:
  • 118,000 BTU with 0.85 UEF; battery-powered for off-grid starts.
  • Portable with handle; overpressure/overheat protections.
  • 1–2 fixture capacity; 86–113°F temp range.
  • Quick-connect propane hose compatibility.
• Pros:
  • Ultra-affordable and lightweight (15 lbs).
  • 2-year warranty; no venting needed outdoors.
  • Fast setup—under 10 minutes for most users.
• Cons:
  • Limited flow for multi-fixture homes.
  • Basic controls lack digital precision.
• Amazon Customer Ratings and Reviews: 4.3/5 from 2,000+ reviews; “Budget lifesaver for camping—consistent LP hot water anywhere!” Some question long-term rain durability but love portability.
• Why It’s a Good Choice for LP Users: Low-cost, vent-free design maximizes propane’s mobility for sporadic use.
• Ideal Use Case/Who Should Buy: Campers, tiny home dwellers, or budget buyers needing portable, entry-level power.

8. A.O. Smith ATU-199H (LP)

• Compelling Product Description: A.O. Smith’s ATU-199H tackles high-demand LP scenarios with 9.8 GPM flow and X3 scale prevention technology that triples resistance to mineral deposits, ensuring peak efficiency in hard-water regions. The 0.97 UEF condensing design optimizes propane burn for 34% savings, while WiFi-ready controls and built-in pump support allow app-monitored recirculation for instant heat. Robust stainless internals and low-NOx emissions make it a clean, long-lasting indoor option, powering 4 baths effortlessly without fluctuations.

Buy It From Amazon

• Price: ~$1,399.
• Key Features and Benefits:
  • 199,000 BTU with 0.97 UEF; X3 scale tech for longevity.
  • WiFi compatibility; built-in pump for recirculation.
  • Corrosion-resistant stainless components.
  • High flow for 4+ fixtures; condensate management.
• Pros:
  • 15-year warranty; easy annual maintenance access.
  • Superior scale protection for LP variability.
  • Quiet and compact for indoor fits.
• Cons:
  • Heavier unit (75 lbs) for wall-mounting.
  • Professional install advised for gas lines.
• Amazon Customer Ratings and Reviews: 4.6/5 from 500+ reviews; “Flawless LP upgrade in our hard-water home—endless supply, no buildup!” Minor app glitches reported but fixed via updates.
• Why It’s a Good Choice for LP Users: Advanced scale tech safeguards against propane-induced inconsistencies.
• Ideal Use Case/Who Should Buy: Families in hard-water LP areas with multiple baths seeking protected, high-flow reliability.

9. State Water Heaters STHR-199 (LP)

• Compelling Product Description: State Water Heaters’ STHR-199 offers premium-like prowess at a mid-tier price, with 9.8 GPM on LP and X3 technology to fend off scaling for sustained 0.97 UEF performance. This indoor condensing unit’s low-NOx burner ensures clean operation, while recirculation support and error diagnostics keep hot water flowing smoothly to 4 baths. Compact and quiet, it’s a value-driven choice for larger homes, delivering 34% propane savings without frills like apps—focusing on core reliability and ease.

Buy It From Amazon

• Price: ~$1,199.
• Key Features and Benefits:
  • 199,000 BTU with 0.97 UEF; X3 scale prevention.
  • Low-NOx condensing; recirculation compatibility.
  • Stainless heat exchanger for durability.
  • 15-year warranty; simple LED interface.
• Pros:
  • Cost-effective for high flow; 15-year coverage.
  • Quiet fan (49 dB); flexible venting.
  • Proven brand reliability in LP setups.
• Cons:
  • Lacks built-in smart features.
  • Specific venting requirements.
• Amazon Customer Ratings and Reviews: 4.5/5 from 400+ reviews; “Solid LP value pick—saves space and propane in our big house!” Users note easy install but recommend pro venting review.
• Why It’s a Good Choice for LP Users: Balances power and affordability with efficient, protected propane use.
• Ideal Use Case/Who Should Buy: Budget-conscious owners of 3-bath homes wanting robust, no-nonsense performance.

10. Eccotemp i12-LP Portable

• Compelling Product Description: Eccotemp’s i12-LP is the ultimate lightweight LP companion for mobile lifestyles, cranking 3 GPM from 84,000 BTU to heat sinks or single showers on demand. Battery ignition and overpressure protections enable electricity-free starts, while the 0.82 UEF keeps propane sipping low for extended trips. Rugged outdoor design with quick-connect fittings suits RVs or workshops, offering a simple, affordable entry to tankless freedom without permanent installs.

Buy It From Amazon

• Price: ~$179.
• Key Features and Benefits:
  • 84,000 BTU with 0.82 UEF; battery-powered ignition.
  • Overpressure/flameout safety; portable (13 lbs).
  • 1-fixture focus; 77–122°F temp dial.
  • Easy propane hose attachment.
• Pros:
  • Highly portable and budget-friendly.
  • 2-year warranty; no venting hassles.
  • Instant heat-up for point-of-use.
• Cons:
  • Low flow unsuitable for whole-home.
  • Outdoor-only; basic temp controls.
• Amazon Customer Ratings and Reviews: 4.4/5 from 3,000+ reviews; “RV must-have—hot water on the road with LP ease!” Occasional battery drain in cold noted but rare.
• Why It’s a Good Choice for LP Users: Compact form harnesses propane’s portability for nomadic, low-demand applications.
• Ideal Use Case/Who Should Buy: RV enthusiasts or point-of-use needs on a tight budget.

Comparison Table

How to Choose the Best LP Tankless Water Heater

• Key Factors:
  • Flow Rate (GPM): Match to needs—3–5 GPM for 1–2 baths (e.g., single shower=2 GPM); 8+ for larger homes with simultaneous use.
  • Efficiency (UEF): Target 0.90+ for propane savings; higher UEF means less tank refills and lower emissions.
  • Installation Type: Indoor (vented, pro-preferred) vs. outdoor (vent-free, DIY-friendly); factor $1,000–$2,000 labor.
  • Budget & Warranty: $150–$200 for portables; $1,200+ for whole-home; prioritize 15+ year heat exchanger coverage.
  • Maintenance Features: Scale protection for hard water; recirculation for instant hot water; freeze-proofing for cold areas.
• Tips for Success:
  • Calculate demand: Sum GPM for peak uses (shower=2, dishwasher=1.5); add 20% buffer for cold groundwater.
  • Verify propane setup: Minimum 1/2-inch line for high-BTU units; consult plumber for sizing.
  • Enhance longevity: Install with water softener; flush annually to prevent buildup.
  • Hunt rebates: ENERGY STAR models qualify for $300–$600 federal incentives via ENERGY.GOV.
  • Test compatibility: Use manufacturer calculators for altitude and temp rise.

FAQs

• What’s the difference between LP and natural gas tankless? LP versions use propane tanks for off-grid flexibility but cost ~20% more per BTU; performance is nearly identical with proper conversion.
• Do I need professional installation? Essential for indoor/gas line models to meet codes; outdoor portables are DIY in 30–60 minutes.
• How much can I save on propane? Up to 34% vs. tanks (DOE data)—expect $100–$200/year for a family of 4, depending on usage.
• What’s the lifespan? 20+ years with yearly maintenance like descaling; far exceeds tanks’ 10–15 years.
• Can it handle cold climates? Yes—most include freeze protection to -30°F; oversize BTU by 20% for groundwater below 50°F.
• Summary: Upgrading to one of the best 10 LP tankless water heaters solves hot water shortages with endless supply, 34% propane savings, and space-saving designs tailored for rural and off-grid life. From budget portables like the Camplux 16L to powerhouse whole-home units like the Rinnai RU199iN, our picks address every need with proven reliability.
• Top Recommendation: The Rheem ECOH200DVELP3 for its smart WiFi features, balanced 8.4 GPM flow, and energy-efficient 0.93 UEF—ideal for most LP households.
• Call to Action: Tally your GPM needs, scan our comparison, and invest in endless comfort—head to Amazon for current deals and kickstart your propane-efficient upgrade today!