I did a home inspection on a condo/townhouse back in early May. The client says the utility company red tag the tankless water heater due to gas leak resulting from improper venting. A plumber inform the client the tankless water heater vent should be PVC instead of the Steel Vent. Plumber recommended to correct this action by installing a new pvc vent pipe. Is this correct?
Does the vent material make a tankless water heater venting system improper? Does this fall within the Standards of Practice for a home inspector to identify as improper on our reports?
I did some research on the manufacturer installation instructions. Some models recommend steel and others PVC material.