Units for the temperature regulation of one fluid (water, steam, gas) to the users via thermal oil using heat exchangers. By leveraging an existing thermal oil distribution line, they allow for the automatic and precise temperature regulation of a second fluid to the users. Electronically controlled by a microprocessor system, they are equipped with a user circuit circulation pump, heating elements, an expansion vessel, a power panel, a control panel, heat exchangers or high-efficiency mixing units, and certified control and safety systems. Available in versions for design temperatures up to 350°C and power outputs up to 5 MW.