In the following decades, he developed a large range of products, from gas cylinders to water heaters, from bathtubs to household appliances and kitchen furniture.
In 1919 Aristide started his career in the entrepreneurial world as a draughtsman in a plant of Pinerolo (Piedmont, Italy) and in ten years he became the general manager of the company.
In 1963 in Fabriano, he founded the Aristide Merloni Foundation, Institute for the Economic and Social Development of Marche, which is today a research and study centre.
Diversification, which had already been a key factor of other Italian industrial initiatives, became a guiding principle for Merloni, and at the end of the fifties the production of water heaters, followed by enamelled gas stoves was started.
In 1966 seven plants were created in the Marche region, with a geographical disposition that reminds of the constellation of the Great Bear, in Fabriano, Matelica, Albacina, Genga, Sassoferrato, Cerreto d’Esi and Borgo Tufico.