Franklin stove

From Conservapedia

In colonial America, most people warmed their homes by building a fire in a fireplace even though it was kind of dangerous and used a lot of wood. Benjamin Franklin rectified this unsafe method of heating by inventing, in 1742, the cast-iron stove, or what he called the Pennsylvania Fireplace and we know today as the Franklin Stove. The appliance allowed people to warm their homes less dangerously and with less wood. [1]