My daughter lives in a flat in London in converted circa 1900 5 storey terrace in Bethnal Green. She is considering getting a Stiebel Eltron instant water heater fitted, however if she wants one that is powerful enough for a bath, she needs 3 phase. Are flats like houses in that each flat is on a different phase ? If so, I was wondering if it might be a cheaper job for her as the meter room for all 12 flats is right outside her flat, and if 3 phase was delivered to that room, it would just mean an Electrician taking the 3 phase from that room into her flat directly through the wall and installing a new distribution board. The meter room is locked (for obvious reasons) so does anyone know if there is any way to check if her building is served with 3 phase remotely, other that her paying an Electrician call out fee to come in and look at the meter room ?