A method for assembling a modular air-cooled condenser extending along a vertical axis away from horizontal, wherein the method comprises: - assembling a first condenser bundle having a first set of tubes having first and second ends, a first steam manifold connected to the first ends of the tubes, and a first condensate header connected to the second ends of the tubes; - assembling a second condenser bundle having a second set of tubes having third and fourth ends, and a second condensate header connected to the fourth ends of the tubes; - assembling a third condenser bundle having a third set of tubes having fifth and sixth ends, a second steam manifold connected to the fifth ends of the tubes, and a third condensate header connected to the sixth ends of the third set of tubes; - assembling a fourth condenser bundle having a fourth set of tubes having seventh and eighth ends, and a fourth condensate header connected to the eighth ends of the tubes; characterized in that the method further comprises the steps of: - placing the first, the second, the third and the fourth condenser bundles into a container; - transporting the container to a location upon which the modular air-cooled condenser will be assembled; - assembling a first heat exchange delta by placing the first condenser bundle and the second condenser bundle at an angle to vertical and horizontal and such that the first condensate header is parallel to the second condensate header; - assembling a second heat exchange delta by placing the third condenser bundle and the fourth condenser bundle at an angle to vertical and horizontal and such that the third condensate header is parallel to the first condensate header and to the second condensate header and to the fourth condensate header, and such that the fist, the second, the third and the fourth condensate headers are in a horizontal plane; and - positioning the first and the second heat exchange deltas on a modular tower frame, and, wherein the modular air-cooled condenser includes a single fan associated with said first and second heat exchange deltas. - assembling a first condenser bundle having a first set of tubes having first and second ends, a first steam manifold connected to the first ends of the tubes, and a first condensate header connected to the second ends of the tubes; - assembling a second condenser bundle having a second set of tubes having third and fourth ends, and a second condensate header connected to the fourth ends of the tubes; - assembling a third condenser bundle having a third set of tubes having fifth and sixth ends, a second steam manifold connected to the fifth ends of the tubes, and a third condensate header connected to the sixth ends of the third set of tubes; - assembling a fourth condenser bundle having a fourth set of tubes having seventh and eighth ends, and a fourth condensate header connected to the eighth ends of the tubes; - placing the first, the second, the third and the fourth condenser bundles into a container; - transporting the container to a location upon which the modular air-cooled condenser will be assembled; - assembling a first heat exchange delta by placing the first condenser bundle and the second condenser bundle at an angle to vertical and horizontal and such that the first condensate header is parallel to the second condensate header; - assembling a second heat exchange delta by placing the third condenser bundle and the fourth condenser bundle at an angle to vertical and horizontal and such that the third condensate header is parallel to the first condensate header and to the second condensate header and to the fourth condensate header, and such that the fist, the second, the third and the fourth condensate headers are in a horizontal plane; and - positioning the first and the second heat exchange deltas on a modular tower frame,