grouphead is where the portafilter slots in.. its metal and has a metal screen.. just run water through it for 5 secs into your cup.. it cleans and heats it; heats cup too.. just before pour, empty cup and dry it. itll be nice and hot. water comes out at 90+c as it would for coffee just without the filter in.. I used to have filter in too but ive grown to use hot water from tap. running it all over and through filter.. cleans it and heats it without dismantling. i just leave puck in til next use and just knock it into box..

i use this one but there are plenty available at all wallet sizes... https://www.amazon.co.uk/Sage-BES100...s%2C171&sr=8-5