Control system for use with water heat exchangers available in two versions, one with 3/4'' primary connection, the other with 1'', wired, up to 85kW. It consists of a circulation pump (three steps for the primary circuit, energy class A), temperature sensor, non-return valve 3/4'' and 1'' internal thread, control with on-off button, LED control lamp and digital electric temperature regulator ( adjustable from 0-42C, with indication of actual temperature and temperature difference, which is factory set to 0,5C). The system is also available without a pump or check valve. Guaranteed longevity of the product if you carefully follow the safety and installation instructions.