This paper shows the design of a temperature control for a water heater using a digital controller on an FPGA with SPI communications protocol, which makes use of a thermo-resistance with alternating current (110v-60Hz) to heat water from the room temperature to its boiling point.The Dimmer that has a Triac BTA16-600B works with control values between 3.3-5 Volts with a charge value for up to 220 Volts AC and peak currents of 5 Amps, the temperature sensor is a K-type thermocouple coupled to a Cold junction Max 6675K compensator.Keyword-FPGA,