Provides a continuous hot water experience. 45,000 and 50,000 BTU. Cut-out min/max: 12-1/2 inches-16 inches W x 12-1/2 inches -16 inches W x 16 inches min. D. An adapter plate is required for opening heights above 13 inches, included with 10 gal. door. Wide side flanges and adapter plate allow Atwoods On-Demand to easily fit the rough opening for most brands and sizes of RV water heaters. Access door sold separately. 2 year warranty. 1/box.