Home of the Thermal Tank, the only UL listed, modular, lightweight, high-performance thermal storage tank for DHW and space heating. How can you fit a 700 gal storage tank through a 32 inch door? Which tank is made of non-bonded, eco-friendly, 100% recyclable materials? Which tank features R18 and higher insulation values? Which tank can be installed on roof-tops without a crane? Check out the Thermal Tank at AHR for yourself.