On-Board micro-processor monitors: inlet water Flow, inlet water temperature, and outlet water temperature. Regulates the burner to maintain the set hot water temperature. 42,000 BTUs provide optimum performance for an RV's plumbing. No special LP gas lines or special plumbing requiredQuiet Brush-less Motor12V power that operates at less than 3 AMPsFreeze Protection - Designed for Winter UseDesigned Specifically for Recreational VehiclesCompact Design - Fits in any tank water heater cut-out opening