In the midlands the boiler would preferably be in the utility room (laundry room). The slight waste heat is appreciated there. In London it's wherever the land

In the midlands the boiler would preferably be in the utility room (laundry room). The slight waste heat is appreciated there. In London it's wherever the landlord's plumber can fit it, as he illegally subdivides the house into several flats. At least going by my experience as a student. Kitchen, bathroom, garage, outside wall...