The heat requirement in objects can vary immensely during the day and in the course of a year. A thermal power plant with rpm modulation adapts itself to varying heat requirements with a constantly high efficiency factor. It reduces its output performance to up to 25 % of its maximum performance. This ensures a high number of annual operating hours, an important factor for economic use of a thermal power plant. The amortisation period for investment and operation of the machine are reduced considerably.

Fixed rpm thermal power plants are used for a largely constant heat requirement. They cover a small performance range with optimum, economical use, since the device adapts to the varying heat requirements only when there are losses in efficiency factor.

This can also be partially compensated with larger buffers.

Fixed rpm thermal power plants are particularly suitable for objects in which continuous process heat is required. (e.g. galvanising operations).