Natural convective heat transfer from an isothermal square heated imbedded in a large flat adiabatic surface has been numerically studied. The is at a higher temperature than the surrounding fluid and is facing upwards. The range of conditions considered is such that laminar, transitional, and turbulent flows occur. The aim of the work was to numerically determine how the heat transfer rate from the varies with angle of inclination of the element to the horizontal for relatively small inclination angles. The flow has been assumed to be steady and fluid properties have been assumed constant except for the density change with temperature which gives rise to the buoyancy forces, this having been treated using the Boussinesq approach. The solution has been obtained by numerically solving the governing equations subject to the boundary conditions using the commercial CFD solver ANSYS FLUENT©, the k-epsilon turbulence model with full account being taken of buoyancy force effects having been used. The heat transfer rate from the heated element expressed in terms of a Nusselt number is dependent on the Rayleigh number, the angle of inclination, and the Prandtl number. Results have only been obtained for a Prandtl number of 0.74. Heated element inclination angles of between 0º and 30º and Rayleigh numbers between approximately 105 and 1013 have been considered. The variation of the Nusselt number with Rayleigh number and inclination angle has been explored in detail and results illustrating the changes in the form of this variation have been obtained.