A stove (101) having a grate (108), a fire-box (110) above the grate (108), thermal insulation (123) defining a back surface of a fire-box space (110), and a boiler water chamber (107) or heat exchanger at a back wall of the stove (101) at the level of the fire-box (110), and in which the insulation (123) is disposed between the fire-box space (110) and at least a lower part of the water chamber (107) or heat exchanger that is adjacent the grate (108) so as to provide thermal insulation between the lower part of the fire-box space (110) and the water chamber (107).