An 18 KW in natural gas is just like a 20 KW in propane. Actually, natural gas is less powerful as propane. Propane is more muscular. If you have a 20 KW in propane, it will stay 20 Kilowatt. In natural gas, it drops to 18 KW. It drops 2 KW. Some manufacturers have allowed for that drop nonetheless much. They are not saying anything about understand it. They...