On Fri, 27 Nov 2020 15:59:50 +0000, T i m wrote:

I just had a look on eBay and there are quite a few choices of 2kW
opto coupled module that should be very easy to interface. An Arduino
Nano, a Dallas I2C external temperature probe and a few lines of code
and you should be able to do what you need.

KISS - solid state relay instead of PWM module. 1-Wire temperature
sensor and Arduino to generate the PWM to drive the relay directly
using a PID(*) control algorithm based on measured temp.

(*) Proportional Integral Derivative.
https://en.wikipedia.org/wiki/PID_controller

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Cheers
Dave.