The manual I found says this boiler takes 1–2 minutes to boil water from "keep warm" at 98°C, or 3–5 from 90°C. I can boil 1 litre in about 2 minutes with a conventional kettle, or 2 litres in about 4 minutes. Add 25–50% if using an appliance that costs €15 rather than €50.

It seems rather wasteful to have something like this at home. It would double the "standby power" use of an average home, even perhaps an American one.[1]

[1] http://www.osti.gov/scitech/servlets/purl/795343