Only when mandated by smokeless fuel laws usually, coke is less energy dense than regular (anthrocite/bitumous) coal, but more than charcoal, so using it as a h

Only when mandated by smokeless fuel laws usually, coke is less energy dense than regular (anthrocite/bitumous) coal, but more than charcoal, so using it as a household fuel means you need more storage, and spend more time refueling the fire.