With all due respect, you have to figure this out since not many people are going to pay $700 for half of what a $100 device can do. Honest advice not a critique. It must be hard not to read the negativity from some comments but this is already a great job that you had done! You just need to continue building on it IMHO.
Yeah but having the water hit the grounds at the right temperature is what separates a great machine from an average machine. Yours doesn't do that. Congratz on everything you've done so far but I am your target customer and won't consider a machine that doesn't also manage the water temperature.
We figured out how to heat water thousands of years ago. Flow control is considerably newer