Water heated between 90 to 96'c is ideall for preparing coffee. For some machines, this is made possible by a"PID controller". If your machine has once, you can lay within this range to find what you like.
You'll notice that lower temperatures draw out more brightness, while higher temperatures produce more roasted flavours. If you're not able to choose the temperature for yourself, you can assume for now that the machine is doing its job.
Savour and enjoy!
The Forge Coffee Roasters,
Don Road, Sheffield,
S. Yorkshire, S9 2TF