Xenjum RV Tankless Water Heater 65,000 BTU 15x15in Lockable Door — Dual-Outlet, 3.9 GPM

Designed for full-time RVers, weekend travelers and off-grid setups, this tankless unit replaces bulky storage heaters with a high-efficiency, space-saving solution. It mounts into a standard 13 x 13 inch opening and ships with a 15 x 15 inch lockable door, a wired controller, shower kit and all necessary accessories for a straightforward install. The unit features automatic seasonal flame adjustment, high-altitude ignition capability, freeze-resistant copper plumbing and child-safe locking for security and peace of mind.

How quickly will I get hot water and how much flow can I expect?

Hot water begins within seconds of opening a hot tap — the burner ignites on demand so there’s no tank to preheat. The heater produces up to 3.9 gallons per minute, enough for simultaneous light uses like a shower plus a sink in many RV layouts.

• Ignition in roughly 3 seconds from tap activation
• Maximum output: 65,000 BTU for rapid heating
• Flow rate up to 3.9 GPM depending on inlet temperature
• Consistent temperature control via included controller (95–123°F)

Will it save propane and work efficiently off-grid?

Because the unit is tankless and only fires when hot water is demanded, it eliminates the standby losses of tank systems and reduces unnecessary propane use. The heater includes automatic seasonal flame adjustment so it adapts to changing inlet water temperatures without manual mode switching.

• On-demand burner operation prevents idle fuel consumption
• Seasonal flame adjustment for steady performance in varying climates
• 12V DC operation suitable for typical RV electrical systems
• 1.22 mm fuel nozzle tuned for low-pressure and high-altitude ignition

Can this unit handle cold climates, high altitudes, and safety concerns?

The Xenjum heater is built for challenging conditions: thicker copper plumbing reduces freeze risk and a specialized nozzle supports reliable ignition at altitude. Safety features include a precise thermostat (±1°F) and a child-safe lock on the exterior door to prevent unauthorized access.

• Thickened 1.5 kg copper pipes for improved freeze protection
• High-altitude reliable ignition with 1.22 mm nozzle
• Built-in thermostat and remote temperature control for precision
• Exterior lockable door with two keys for theft and child safety

How easy is installation and what comes in the box?

Installation is designed to match common RV openings and plumbing standards so most owners or technicians can fit it without extensive modification. Xenjum supplies the essential parts and a manual; professional hookup is recommended if you’re unfamiliar with gas or water systems.

• Fits standard 13 x 13" cutout; door measures 15 x 15"
• Includes controller, shower kit, two keys and full manual
• Standard NPT fittings make plumbing connections straightforward
• 24-month warranty and technical support available from Xenjum

Who is this for? The Xenjum RV Tankless Water Heater is ideal for RV owners, travel trailer and motorhome occupants, and off-grid dwellers who want a compact, efficient, and reliable hot water source. It suits full-time RVers who need dependable year-round operation, adventurers heading to high-altitude destinations, and anyone seeking to maximize interior space while minimizing propane consumption. If you want faster hot water, on-demand fuel savings, and built-in protections for cold weather and safety, this unit is designed to meet those needs without the bulk of a tanked heater.