This brewer is in my office which has factory machinery running outside in the background. I can barely hear the heating process at all....what I have heard sounds similar to water boiling in a pan on a stove. It takes the unit about 2 minutes to heat the water. When it starts brewing, it happens quickly (within 10 seconds) and you will definitely hear the last 3-4 seconds as it pushes through the Kcup. In my working environment, this is not an issue. If you work in an extremely quiet office or something like that in which you don't want anyone else to hear the 3-4 seconds of noise - that might be an issue. Hope this helps.