In the UK I think a more basic kettle-like machine would be useful though - tea made with little paper bags being the default preference with builders?
I bought my first house in the UK less than a year ago. I ripped absolutely everything out. For weeks at a time I had only 1 working sink, with 1 working electrical output. During this time I had local contracters in to deal with stuff I either didnt have the time, expertise or legal certifications to manage myself. Barring a carpenter, every single one brought a makita radio/wifi unit, and every single one needed to leave the house to get hot drinks because the single socket could not safely take more devices plugged into it (chargers on an extension), etc.
Large sites: portakabin with microwave & fridge and kettle and hotplate and fixed tables usually
Interorior refurb in larger office and showroom buildings: again part of a room set up for breaks.
Smaller house extension jobs: this could be the market.
As another poster points out probably a novelty/freebie for sales purposes.