hi. *It could be lots of things. *I had a quick look and gather it is a hx machine with vibe pump? *In that case, I would not have expected plumbing in to make any difference. *I dont think the coffee would be coming out cold. *Your boiler is well hot enough (1.5 bar), and the hx would heat it adequately. *If you run it without any coffee in the filter the water should come out pretty hot (too hot to touch). *You should be looking to grind to about 30ml in 25 secs (single shot). *Adjust your grind/tamp until you get that, and see if anything improves. *if you do this, and if your coffe is ok (not too old, not from safeways!) and you still have problems then maybe you have a pump problem, or are losing pressure somewhere.