Boiler stoves incorporate a boiler that takes some of the stove's output and heats water for domestic hot water and/or central heating.
This also has the benefit of reducing the heat output to the room, so that you can enjoy the sight of a generous fire without overheating the room.
Many of these stoves have a high output boiler that will power central heating radiators. Others are available with a smaller optional boiler for domestic hot water.