DIY Brewing Temperature Controller

Written by preston manning bernstein
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DIY Brewing Temperature Controller
A brewing temperature controller is an essential device when creating more complex brews. (beer image by Victor M. from

Brewing beer with a standard glass thermometer can be an arduous and time-wasting process. Because of this, the brewing temperature controller was constructed to streamline the brewing process. The controller keeps one temperature stable at all times and monitors three other temperatures. Consequently, the brewing process become infinitely easier, letting the home brewer concentrate more on getting the flavours they desire. Instead of purchasing a brewing temperature controller, try building this time-saving device on your own.

Skill level:

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Things you need

  • 1 screwdriver
  • 1 digital thermostat
  • 1 spool soldering wire
  • 1 solid state relay
  • 1 pack heat shrink tubing
  • 1 telephone cord
  • 1 extension cord
  • 1 piece themostat wire
  • 1 DC converter plug
  • 1 job box
  • 1 cover plate
  • 1 15A receptacle

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  1. 1

    Remove the back of the thermostat and then remove the circuit board by unscrewing all the screws and freeing all the battery terminals.

  2. 2

    Desolder the thermistor, then solder a piece of speaker wire into where the themistor used to be. Solder the thermistor onto the other end of the wire lead.

  3. 3

    Use the heat shrink on each thermistor wire. Apply to the wire using a hairdryer.

  4. 4

    Route the remote thermistor through the housing of the thermostat.

  5. 5

    Wire up the box according to the wire diagram (check Resources section).

  6. 6

    Connect the DC plug and wire to SSR to the corresponding terminal on the thermostat.

  7. 7

    Connect all the wires to the SSR.

  8. 8

    Mount all parts to the job box, then test to see if it works.

Tips and warnings

  • Do not attempt to create this without proper training in constructing a circuit board.

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