Actuator for climate systems based on water pipes which allows the control of up to 4 outputs for on/off valves operated at 230 VAC by means of triacs with short-circuit protection. It includes one independent thermostat for each output, 4 analogue-digital inputs and a module with 10 logical functions. It has a sole power input for all the outputs, as well as a common neutral for an easier installation of the valves. It allows manual control of the outputs with status indication through LEDs.