Rheem Performance 40 Gal. 32,000 BTU Liquid Propane Tank Water Heater. The water heater was show on receipt to be a LP gas water heater, the box indicated it as LP gas and the Labels over the gas inlet shows LP gas. The Manufacture Rheem said the serial number indicates it is a natural gas unit. This unit was installed in June of 2022 and worked until Nov of 2022. Upon inspection when failed there was soot all in the water heater and flue pipe. We believe we have been getting poisoning by carbon monoxide because we have been feeling ill. The flue pipe on the roof is black with carbon and this could have burned my house down. I have extensive pictures and documentation showing this problem and my fear is this is not an isolated incident by the manufacture and the may need to do some type of recall check and their plant procedure need to be reviewed and see how this mistake happened.