Suburban Water Heater LP 5186A - S6U5186A
LP
Tankless
Direct Spark Ignition
60
000 BTU
12.5 Inch Height x 12.5 Inch Width x 20.0 Inch Depth
36 Pounds
Enjoy endless hot water with Suburban’s NAUTILUS On Demand RV Water Heater. Say “good-bye” to waiting for water to reheat in a conventional tank. Showers and baths are best enjoyed slowly, so LIVE FREE from the restraints of limited hot water supplies. Dishes and even the laundry can be done with an infinite supply of hot water whenever and wherever, simultaneously from every fixture. With no storage tank to heat water, the NAUTILUS On Demand RV Water Heater reduces weight and increases efficiency by only operating when the need for hot water arises. Weighing just 36 Pounds with the vent assembly, the NAUTILUS On Demand RV Water Heater comes standard with a freeze protection mechanism and state-of-the-art 3-Try Direct Spark Ignition for safe and reliable operation.
Features
- Exclusive 60,000 BTU Two-Stage Self Modulating Combustion System
- Built-In Freeze Protection
- The Exclusive 2-Stage Modulating Combustion System (M.C.S) Monitors: Inlet Water Temperature And Water Flow, Output Water Temperature, Heat Exchanger And Burner Operation
- 2-Stage Modulating Combustion System (MCS) Which Instantaneously Adjusts The LP Gas Input To Provide Consistent And Endless Comfort Regardless Of Your Hot Water Needs
- Only 36 Pounds Installed
Specifications
| Type: LP Gas |
20 x 12 x 7.5 |
| Model: Disc |
25,000 |
| Capacity: No Tank |
Electronic Ignition |
| Ignition Type: Direct Spark Ignition |
White |
| Wattage Rating: Disc |
Y |
| BTU Level: 60000 BTU |
76.6 |
| Width: 12-1/2 Inch |
192487238769 |
| Height: 12-1/2 Inch |
CN-China |
| Depth: 20 Inch |
Indoor Noise Level dBA (Hi/Med/Lo): 61/57/54 |
What our Experts Think
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Direct OEM Fit: Designed specifically as a replacement for Suburban Water Heater LP 5186A (S6U5186A) — ensures perfect compatibility and hassle-free installation.
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Reliable Hot Water Delivery: Consistent performance you can trust for daily use in RVs, campers, or off-grid setups.
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LP-Optimized Efficiency: Propane-focused design promotes efficient combustion and energy use, reducing fuel waste.
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Durable Construction: Built with quality materials that resist corrosion and wear for long service life.
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Easy Install & Service: Technician-friendly engineering speeds installation and maintenance.
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Smart Value Choice: High-quality OEM part at a competitive price — excellent for replacements or preventative upgrades.
Q&A
Q: What is the Suburban Water Heater LP 5186A (S6U5186A)?
A: A propane-powered tankless on-demand RV water heater designed to deliver continuous hot water without a storage tank.
Q: How does the tankless design benefit users?
A: Heats water only when needed, reducing weight and increasing efficiency while providing a continuous (endless) supply of hot water.
Q: What is the heating capacity?
A: Up to 60,000 BTU, with a 2-stage modulating combustion system that adjusts LP gas input for consistent temperature.
Q: What are the key performance features?
A:
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Direct spark ignition for reliable starts
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Built-in freeze protection
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Fast hot water delivery with 7-second ignition time
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Operation from approx 0.5–1.5 GPM flow range for balanced performance.
Q: What are the size and weight?
A: Compact footprint (~12.5″ H × 12.5″ W × 20″ D) and weighs about 36 lb installed.
Maintenance Tips
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Annual Tank Flush – Drain and flush the water heater tank to remove sediment and mineral buildup at least once a year to maintain heating efficiency and reduce noise.
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Inspect Anode Rod – Check the anode rod annually; replace if heavily corroded to protect the steel tank from rust and extend lifespan.
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Check for Leaks & Corrosion – Regularly inspect all water and gas connections, valves, and seals for leaks, corrosion or wear; tighten or have worn parts replaced.
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Pressure Relief Valve Test – Test the temperature & pressure relief valve yearly by lifting the test lever to confirm it opens and reseals properly.
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Vent & Combustion Area Cleaning – Keep exterior vents and combustion chamber free of debris, insects, and obstructions to ensure safe exhaust flow and efficient ignition.
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Ensure Proper Ventilation – Verify all vent paths are clear and functioning to avoid gas buildup and combustion issues.
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Professional Inspection – Schedule yearly professional service to check gas controls, safety components, and overall system integrity.
Damage 
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