ICC-SRCC Releases Expanded OG-300 Ratings Covering North America

October, 2020 – The Solar Rating & Certification Council (ICC-SRCC) has announced the latest update to the OG-300 rating system for Solar Water Heating Systems. The widely used OG-300 ratings have been updated and expanded to provide performance ratings for locations throughout North America by adding locations in Canada, Hawaii, Central America and the Caribbean. Click here for more information.