When replacing a water heater or furnace, it is often necessary to replace the vent connector as well. The vent connector is the pipe that connects the appliance to the chimney.
If the correct size pipe is not present on an appliance, there is a good chance that the combustion gasses from the appliance will not leave the building. This is unsafe.
The draft hood that is supplied by the manufacturer is usually the size the vent connector needs to be. The photo shown above has a smaller draft hood than the vent connector and there is condensation and corrosion on the draft hood. Those stains along with the rust and missing escutcheon plates make me believe this water heater has been backdrafting for a long time.
Charles is a home inspector and a home inspector trainer. He started as a professional home inspector in 1993. He works for Chicagoland Home Inspectors, Inc. and Bellman Group, Inc. He has earned the title of Certified Master Inspector (CMI) from the Master Inspector Certification Board. He earned the title Certified Property Inspector (CPI) from the International Association of Certified Home Inspectors. He earned the title ASHI Certified Inspector (ACI) from the American Society of Home Inspectors. He served as a Director and Officer of the American Society of Home Inspectors. He hs a tremendous passion about the home inspection profession and prides himself on helping his clients with the biggest purchase of their lives.