The Girard tankless RV hot water heater is the result of many years of research and experience. It is easy to operate and provides endless water at the precise desired temperature. The onboard microprocessor monitors incoming cold water temperature, flow rate and outgoing hot water temperature to maintain a constant, steady hot water flow. With an ultra-easy installation, this continuous hot water heater for RVs can fit into any tank water heater opening and won't weigh down your rig with its surprisingly lightweight design. The water heater door is easy to open and close - no more twist latches. The hinged door and sliding latch allow fast, easy access to the water heater and the silicone exhaust ring adjusts for easy alignment of the exhaust tube.