When magnetic field strength is increased to 1000G, heat transfer dynamics of the same nanofluid deteriorate and in this case the maximum increase is reached with 0.5g/L of nanoparticles added to the base fluid. All of the cooling curves recorded at this magnetic field strength are almost identical to the cooling curve of base fluid,deionised water. We can conclude that 1000G is above a point of saturation when thermal properties of ferrofluids decrease due to large agglomeration of nanoparticles.This effect has been explained by other researchers