Combustion and heating equipment

Combustion and heating equipment including a body having a lower part, a flue extending from said body an underfeed stoker located in said lower part, the stoker including a retort and a screwfeeder extending through the body to an inlet means, the screwfeeder incorporating a screw flight to reverse hand, a drive arrangement for the screwfeeder at one end thereof and a mobile fuel container at the other end thereof separate from said equipment, but connectible to said inlet means, a jacket extending around the body, a heating space defined between the body and the jacket, at least two ducts disposed within the body and spaced apart vertically above the underfeed stoker, said ducts extending through the body and positioned to interconnect different parts of the heating space, means for introducing a fluid to be heated and causing flow thereof through the heating space and through at least one of said ducts, an outlet means from the heating space and through the jacket for the fluid, and an overfire arch situated above the retort and below the ducts for reflecting heat back to the retort.