I guess you would only pay the once for the disconnection from the supply.
My dad’s old sheltered flat was on a shared boiler for heating and hot water, but that was heavily discounted, you still had a choice of the communal supply heat/hot water or using your own gas fires, that was fitted in all the rooms.
My hifi certainly kicks quite a bit of heat, I can almost hear the wheel in the meter speed up every time I turn it on
Not to mention the media server/tvheadend server/nas drives and various other electronic devices all soaking up the juice 24/7.