Fogatti | 66,000 BTU Tankless Water Heater w/Controller | INSTASHOWERULTRA | FS10B1SN | Wired Controller | 3.9 GPM
Fogatti FS10B1SN InstaShower Ultra 66,000 BTU Tankless RV Water Heater (3.9 GPM)
Power your RV with next-level hot water performance. The InstaShower Ultra FS10B1SN delivers up to 3.9 GPM of continuous hot water with a high-output 66,000 BTU system, making it ideal for multi-fixture use and full-time RV living.
Designed as a upgrade over standard tank systems, this unit provides instant hot water in seconds with no recovery time. The integrated mixing tank and staged combustion system ensure stable, comfortable temperatures even during simultaneous use.
*** Easy to install exterior service access door is sold separately
Key Specifications
- Model: FS10B1SN (InstaShowerUltra)
- Type: Tankless (On-Demand) RV Water Heater
- Fuel Type: Liquid Propane (LP)
- Power Supply: 12V DC
- Heating Capacity: 66,000 BTU
- Flow Rate: 0.5 – 3.9 GPM
- Temperature Stability: ±1°F precision control
- Ignition: Automatic electronic ignition
- Control System: Wired controller + LED digital display
- Temperature Range: Approx. 95°F – 123°F
- Water Pressure Range: ~14.5 – 116 PSI
- Exhaust System: Forced exhaust, sealed combustion
- Heat Exchanger: High-efficiency design with integrated mixing tank
Advanced Features
- Endless Hot Water: Continuous supply with no tank limitations
- Built-in Mixing Tank: Eliminates temperature swings
- Staged Combustion Technology: Optimizes propane usage and comfort
- Fast Heating: Near-instant hot water delivery
- Multi-Fixture Capability: Supports shower + sink simultaneously
- High-Altitude Operation: Reliable performance up to ~9,800 ft
- Cold Weather Ready:Anti-freeze protection system
- Powerful Forced Exhaust Fan:Stable combustion in all environments
Safety & Protection
- Flame failure protection
- Overheat protection
- Dry-burn prevention
- Flue blockage detection
- Automatic gas shutoff
- CSA-certified design for RV use
- Designed to replace Suburban & Atwood 6–10 gallon tank heaters
- Compatible with standard RV cutouts (door kits available in multiple sizes/colors)
- Includes wired controller for easy temperature adjustment
Compared to standard 2.9 GPM units, the FS10B1SN offers:
- Higher flow rate (3.9 GPM) for better multi-use performance
- More powerful 66,000 BTU heating system
- Improved temperature stability with mixing tank technology
- Faster, more consistent hot water delivery
Need help confirming fitment?
Our team at United RV Parts is here to help you find the right replacement or parts for your RV Water Heater.
Text or call 817-984-1852 with the make and model number of your existing water heater and we’ll make sure you get exactly what you need the 1st time.
