AERCO International , a manufacturer of high-efficiency water heaters and boilers, moved its corporate headquarters to 100 Oritani Dr., Blauvelt, N.Y. AERCO previously operated out of three separate facilities in Northvale, N.J. With 156,000 square feet, the new headquarters is more than twice the size of AERCO’s former headquarters. The new facility consolidates all existing operations into one building, including an expanded R&D laboratory.