Me and some friends are expanding our beer brewing setup with an extra kettle and heater. We want to use both of these at the same time (one for the mash step and one for the boiling step) to brew two batches at the same time. The problem however is that we now have two 3000W elements on a single 16A 230V breaker, which will trip the breaker in no time.
The good news is that we do not need the full 3000W in the mash step, so we are looking for a way to control the current flow to this second heater. I have read a lot about people controlling electric heaters with slow on-off cycles, but these would still trip the circuit breaker since both elements would be on full power for a couple of seconds.
TLDR: is there a way to electronically (and variably) control the current flowing through a 3000W 230V AC heater?