AT Electric Boiler Series ,   Model: AT Additional Information Absolute Efficiency – Total Comfort! Not only is the Argo “AT” Series Electric Boiler 100% efficient, with operating temperatures from 90°F to 180°F, it’s ideal for both low temperature radiant systems and standard hydronic heating in both residential and commercial applications! Heat Exchanger: Cast Iron Boiler Type: Hot Water Brochure 240004988 - AT Rev. 6/10 905.4 kb Installation & Operation Manual I-80 - AT Rev. B 1.8 MB Warranty 240007033 - AT Electric Boiler Warranty Rev. 10/07 29.1 kb