Six Gallon capacity. 8800 BTU. 12-1/2" x 16" x 15-1/2". Atwood's heat transfer system with patented U-tube design delivers more hot water. Access to all the controls is as easy as opening the access door. All gas lines are connected in a sealed combustion area which is vented to the outside of the vehicle as a safety precaution. For use in RV's only.