What is the HHV rating of this stove?

The HHV rating of this stove is 69% and the LHV is 74%. For further information on these rating, please see pages 8 and 9 of the installation manual. Install ManualIf you have any further questions or need further assistance, please feel free to reach out to one of our experienced customer service representative and they would be happy to assist you. Thank you and have a wonderful day.