Looking to get into electric brewing? Look no further than the patent pending Blichmann Engineering modular power controller. It is ideal for electric boil kettles, or other applications where temperature control is not needed, but a robust low-cost power controller is desired. Perfect for BIAB and extract brewers who want to get into electric brewing! This amazing product is an ideal companion with our revolutionary BoilCoil immersion heaters, but it’ll also work with ALL manufacturer’s immersion heaters! Our unique modular power controller lets you precisely control the power of your electric heating element from 0-100% power. Need to control more than one heating element for large kettles? Simply add up to 4 additional relay modules and drive them all with one power controller. Unlike cheap "dimmer switch" based power controllers, whose power output is not linear, the modular power controller is much easier to control the perfect boil intensity and heating rate. We accomplish this using a tried and true industrial technique called Pulse Width Modulation (PWM). Simply put, it controls the percentage of time the heater is energized over a very short 1 sec interval. So turning the knob to “6” energizes the heater for 0.6 seconds, and turns it off for the remainder of the 1 sec interval. This robust reliable technique is gentle on your heater, is extremely linear, and doesn’t create electrical noise like other techniques can. Note that this product does not read or control temperature.