Camplux complete line of reliable RV tankless water heaters for all recreational vehicle applications. Camplux RV water heaters RS264/RS264B Pro upgraded series, built-in corrugated water tank, long term thermostat, also heats up your water while driving. Compact size, energy efficiency, and on-demand hot water supply. Come with a door and indoor mounted switch controls. Warm Tips-Power Supply Need to choose an adapter with current: 4A or more, voltage: 12V DC.