ATWOOD 90205 OD-50 ON-DEMAND 50K BTU TANKLESS WATER HEATER Endless Hot Water. Energy Efficient. Designed to Fit. Features: * 50K BTU's * One size fits all design * Designed to easily fit the rough opening for any brand of RV water heater * Only 30 lbs. (no tank full of water) * Door Not Included * Electronic flow sensor * High and low heating modes * Powerful 50K modulating burner * Heat exchanger * Consistent hot water _How On-Demand Works_ * Hot water tap is turned on * Flow sensor detects flow of cold water coming in * The burner is automatically ignited * Water is instantly heated up as it circulates through the heat exchanger and out to the tap _Endless Hot Water_ * No more RV Showers. Since Atwood's on-demand water heater instantly heats water, it can supply a constant stream of hot water that is limited only by the fresh water supply. _Weight Savings_ * An on-demand water heater does not use a tank, thus eliminates up to 115 pounds of dead water weight _Energy Efficient_ * Atwood On-demand water heaters only heat water when it is needed. No wasted energy. * Traditional tank water heaters must turn on periodically to maintain the stored hot water temperature. _Cold Weather Performance_ * High output burners deliver hotter water more days of the year. * Just because it is cold outside doesn't mean you get a cold shower. _Simple Operation,Just like home_ * Turn onHOTwater * Mix inCOLDto reach desired temperature _Modulation Valve_ * A flow controlled valve adjusts the burner input from 16,000 - 50,000 BTUs based on water flow rate (The slower the flow, the less heat that is needed). This provides for optimal operating efficiency. * Brand X will have 2 settings only at 27,000 and 34,000 BTUs. This results in not enough power on cold days and wasted energy on hot days. _One Size Fits All_ * Wide side flanges and an adapter plate allow Atwood's On-Demand to easily fit the rough opening for all other brands of RV water heaters. Dimensions * Product Dimensions: 12.5"W x 12.5"H x 13.5"D * Cut-Out Dimensions: 12.5" - 16" W x 12.5 - 16" H x 16"D (min) Please Note: * Door& Switch (91859)Not Included * Please note that with all gas appliances there is approximately a 4% reduction in performance for every 1000 feet of elevation over 2000 feet. This means that the performance of this water heater, as with any gas appliance will reduce at higher elevations.