The Inferno Force Series from A.I.M. offers the ultimate flexibility in boiler and water heater application at a competitive price. Efficiencies of 85.1% are among the highest available in non-condensing boiler and water heater designs. The Inferno Force incorporates all the latest technological advances that engineers, contractors, and building owners look for when specifying boilers and water heaters. Where mechanical space is limited the Force's stackable frame option allows units to be stacked two-high, adding valuable BTU's while keeping the footprint to the size of a single unit.