Most small coffee machines will take a matter of minutes to heat up . However, if your machine has an E61 commercial group head, a large boiler or even two boilers, you will need to allow more time for it to fully heat up. It’ll take around 10 minutes for the machine’s boiler to get up to pressure and in theory, you will be able to make coffee but you’ll improve the quality of you cup of coffee enormously if you can allow the group head and all the metal in your machine to get properly hot and this can take up to half an hour. This is easily managed with the help of a smart plug which will enable you to automate the on/off function, or simply make use of an app to control your coffee machine from anywhere in the world. 'Step-adjustment' coffee grinders are far less accurate than 'Stepless' coffee grinders. For pairing with high quality coffee machines and brewing espresso, the latter is required as it gives more control over the size of the grind and therefore the timing of the extraction.