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At least in the not-newest controller, each of the two elements are controlled by a relay. So the elements are either on or off. By switching the elements on and off in intervalls the average power over time can be say 1800W. With the large mass of the wort and relatively long time to change...

Brewhound, the Grainfather controller can relatively easy be retrofitted. There are a few steps needed like fitting a well for the temp sensor, mounting the controller on the Ace and total recabling. The elements, overheating thermostat and the pump are all resusable. The only real problem is...