Sorry foxbat, I should have been clearer! I am using the temp sensor to indicate mash temp and the pod is set to manual mode, to control the boil element. I have tested having this set to 100, I have also set it to 90% to check that the element indicator lamp goes off for 1/10 of the time then reduced it to 50% just to make sure it was acting correctly, then back to 100 to attempt to achieve the boil. I do think maybe I have been fooled into thinking it should look explosive by some YouTube videos of boiling wort too!