u/KoffeeSyndrome

I have a GCP. I did the styrofoam cup test and my group head is releasing water that’s 140F. Of course I can get it up to steaming hot with crazy temp surfing technique but it’s too hard to time it so the water is around 190F with how far off it is. I’m considering replacing the thermostat, but I wonder if I’m better off just going for gaggimate? Does this also replace the thermostat?

Thank you