An 18 KW in natural gas is like a 20 KW in propane. Actually, natural gas is not quite as powerful as propane. Propane is tougher. If you have a 20 KW in propane, it will remain 20 Kilowatt. In natural gas, it drops to 18 KW. It drops 2 KW. Some manufacturers have allowed for the drop however is not much. But, they are saying anything about the software. The...