If you're going to invest in an electric system, might as well not half ass it. Have an electrician upgrade your circuit to a 30a gfi minimum. This will give you more than enough power for a 5500w element, panel, and pumps.
I'd start with with electric brewery as mentioned above. Spike has an all in system now as well. Basically based around the same design. Both are zero automation outside of holding temperature. PIDs with ramp function exist, but are a PIA to program with four buttons.
Hosehead controllers are RPi based and have more automation. This is the only out of the box micro controller solution I know of.