Continuing the line of two-seat patrol fighter monoplanes initiated with the W.29, the W.34 was the final WWI development of the series of float seaplanes designed for the Hansa- und Brandenburgische Flugzeug- Werke by Ernst Heinkel and Hans Klemm. Essentially a scaled-up W.33 intended for the 300hp Basse und Selve BuS IVa six-cylinder water-cooled engine, only one prototype of the W.34 had been completed by the end of the War. Additional examples powered by the 300hp Fiat A 12bis engine were built after the termination of hostilities.

W.Green, D.Swanborough "The Complete Book of Fighters", 2000