I have a used Bradford White gas (propane) hot water heater for sale. It's model MI5036FSX, 50 gallon capacity, 3600 BTU, and atmospheric venting. The height is 59.625 inches, diameter is 20 inches, and the weight is 145 lbs.
The water heater is just over a year old and is in excellent working condition. I replaced it with a tankless hot water heater.
Thank you for looking.