At that time in Victorian Britain coal was very expensive. Scrooge was against burning a lot of coal which in effect was burning money
Scrooge wouldn't permit a fire in the counting house because he was obsessed with saving money at all costs. He viewed spending on things like heating as wasteful and unnecessary, preferring to keep the workplace cold to save on expenses.
coal
he had an open coal fire and the same at his office which were fired by meger amounts of coal
Scrooge wouldn't pay for the coal to heat it.
A new coal-scuttle!
Scrooge burned his own cash in the furnace at his office as a symbolic gesture of letting go of his greed and materialistic ways.
He told him to leave his counting house and keep Christmas In his own way as He (Scrooge) would keep it in his.
Another coal scuttle.
More coal.
A pay rise and instructs him to buy a new coal scuttle.
He didnt ask a boy for coal. He told Bob to purchase a coal scuttle. He asked the boy outside the windows to purchase the prize turkey for him