Ranein Gen II RV Tankless Water Heater 65,000 BTU — 12V On-Demand, Up to 3.9 GPM, High-Altitude & Freeze Protection

The Ranein Gen II RV Tankless Water Heater is a 65,000 BTU, 12V-powered on-demand system that delivers high-flow hot water for simultaneous use while fitting standard RV cutouts and offering freeze protection.

Designed specifically for RV living and family use, the Gen II combines a high-output burner and oxygen-free copper heat exchanger to heat water faster and maintain steadier temperatures than lower-BTU RV heaters. It replaces many 6/10/12-gallon tank units using a 12.8" × 12.8" opening, runs on 12V DC, and includes a multi-function controller that reports gas use, voltage, and GPM. CSA certified and altitude-optimized, this model is built to support longer showers, multiple simultaneous taps, and cold-climate protection without frequent propane cycling.

How much hot water and flow can I expect for family use?

The Gen II uses a 65,000 BTU burner to produce up to about 3.9 GPM, giving higher flow and stronger pressure than many low-output RV heaters. That means two faucets or a shower plus a sink can run together with minimal temperature fluctuation. Staged combustion and precise temperature control help maintain steady output.

• Maximum flow: up to 3.9 gallons per minute (GPM)
• Temperature range: adjustable from 95°F to 124°F for consistent comfort
• Higher BTU rating reduces temperature sag during simultaneous use
• Oxygen-free copper heat exchanger for quick heat transfer

Will it fit my RV and replace my existing tank heater?

The Gen II was engineered to match common RV cutouts so it can replace many Suburban and Atwood 6/10/12-gallon tank heaters using a 12.8" × 12.8" opening. The exterior access door is sold separately, and door kits are offered in multiple sizes. Installation aligns with standard RV plumbing and 12V electrical systems, making retrofit straightforward for technicians or experienced DIYers.

• Fitment: designed for standard 12.8" × 12.8" cutouts
• Door options: compatible with 15"×15", 15"×18", or 18"×18" door kits (sold separately)
• Power: 12V DC operation integrates with common RV electrical setups
• Plumbing: connects to typical RV water lines and fittings

How does safety and cold-weather protection work?

The unit includes a top-mounted exhaust fan for stable combustion and flame-failure protection with automatic gas shutoff. An integrated anti-freeze function activates when temperatures drop below 42.8°F to protect internal components, and the heater ships CSA certified with a built-in pressure relief valve. These safety systems are designed for dependable operation at higher elevations and in colder climates.

• Anti-freeze: automatic activation below 42.8°F to prevent freeze damage
• Combustion safety: top exhaust fan and flame-failure gas shutoff
• Certifications: CSA-approved for peace of mind
• Pressure relief valve included for overpressure protection

What controls and diagnostics does the remote provide?

The upgraded multi-function controller shows live data for gas consumption, voltage, water flow (GPM) and anti-freeze status, so you can monitor performance from inside the RV. It simplifies troubleshooting and helps you optimize propane use and energy management at altitude. The controller’s clear readouts make it easier to dial in a preferred temperature and spot issues early.

• Real-time readouts: gas usage, voltage, and GPM
• Anti-freeze indicator to confirm protection status
• Altitude-ready: reliable operation up to 9,800 ft
• User-friendly controls for temperature and diagnostics

Who is this for: The Ranein Gen II is built for full-time RVers, families, and travelers who need dependable on-demand hot water with higher flow and pressure than typical low-BTU models. It’s ideal for anyone replacing a conventional tank heater, upgrading for simultaneous use, or camping in colder or higher-altitude environments where freeze protection, efficient combustion, and diagnostic visibility matter.