Suburban Nautilus IW60 Tankless RV Water Heater | 60K BTU | 5186A

Enjoy endless hot water in your RV with the Suburban Nautilus IW60 On-Demand Tankless Water Heater (References 5186A). 60,000 BTU two-stage self-modulating combustion system, integrated freeze protection, and 3-try Direct Spark Ignition — the tankless system that delivers infinite hot water simultaneously from every fixture.

Endless Hot Water — From Every Fixture

• 60,000 BTU two-stage self-modulating combustion
• Continuous hot water — no reheat waits, no capacity limits
• Simultaneous fixture use — shower, dishes, and laundry at the same time
• Only operates on demand — improved efficiency vs tank designs

Modulating Combustion System (MCS)

The exclusive Nautilus MCS monitors:

• Inlet water temperature and water flow
• Output water temperature
• Heat exchanger performance
• Burner operation

The system instantaneously adjusts LP gas input for consistent, endless temperature output regardless of variations in flow or demand.

Built-In Freeze Protection

Integrated freeze protection mechanism helps prevent damage in cold weather.

3-Try Direct Spark Ignition

State-of-the-art 3-Try Direct Spark Ignition for safe and reliable startup.

Lightweight — Just 36 lbs Installed

Weight reduction advantage vs conventional tank water heaters — meaningful for weight-conscious RV builds.

Long-Life Construction

• Porcelain-lined steel tank
• Anode rod to absorb corrosive electrolytical action
• Tank pressure-tested twice for integrity

What's Included

• (1) Suburban Nautilus IW60 water heater
• Standard Suburban wall switch (#234589) — no additional cost
• 261618 Vent Cap / 2-3" Exhaust Tube Assembly

Optional Premium Upgrade — Digital Control Center

Instead of the included standard 234589 wall switch, you can optionally upgrade to the Suburban 162292 control center (successor to 161252) — a digital display / control premium option. NOT required — the included 234589 switch is fully functional. Available as an add-on if you'd like the premium digital control experience.

Dimensions

20" D × 12.5" W × 12.5" H, 36 lbs installed.

⚠️ Professional Installation Required

Involves propane gas, 12V DC electrical, water plumbing, and vent routing. Installation should be performed by a qualified RV service technician. Always leak-test gas connections after installation.

2-Year Suburban Manufacturer Warranty

Key Features

• Genuine Suburban Nautilus IW60 tankless RV water heater
• 60,000 BTU two-stage self-modulating combustion
• Endless hot water — simultaneous fixture support
• MCS system — monitors and adjusts for consistent temperature
• Built-in freeze protection
• 3-Try Direct Spark Ignition
• Porcelain-lined steel tank with anode rod
• Double pressure-tested tank
• Lightweight: 36 lbs installed
• Includes: Water heater, Suburban 234589 wall switch, 261618 vent cap/exhaust tube assembly
• Optional premium upgrade: Suburban 162292 digital control center (successor to 161252) — not required
• Backed by 2-year Suburban manufacturer warranty

Specifications

• Brand: Suburban
• Model: Nautilus IW60
• Cross-Reference: 5186A
• Type: On-Demand Tankless RV Water Heater
• Heat Output: 60,000 BTU
• Fuel: LP (Propane)
• Combustion: Two-stage self-modulating (MCS)
• Ignition: Pilot and 3-Try Direct Spark Ignition (DSI)
• Freeze Protection: Built-in
• Tank: Porcelain-lined steel with anode rod (pressure-tested twice)
• Weight (installed): 36 lbs
• Dimensions: 20" D × 12.5" W × 12.5" H
• Includes: Water heater, Suburban 234589 wall switch, 261618 vent cap/exhaust tube assembly
• Optional Premium Add-On: Suburban 162292 digital control center (successor to 161252)
• Warranty: 2-year Suburban manufacturer warranty