Small and industrial scale nanomaterial syntheses are conducted in batch reactors, which require long reaction times. On the other hand continuous flow processes have the advantage to furnish nanomaterials in large scale. Combination of flow processes and microwave irradiation heating is well suited for rapid production of nanoparticles with good physicochemical properties. In the present study we have used an economical pressureless continuous microwave flow synthesis (CMFS) system for the synthesis of phase pure mesoporous nanocrystalline HA. The CMFS system consisted of two peristaltic pumps, which were used to feed the reactants through the Teflon coil placed in the modified household microwave oven. The speed of the pumps was strictly controlled to achieve the desired retention time of the reactants inside the microwave oven. This cost effective apparatus has the ability to continuously furnish crystalline nanosized HA. We also report here the effect of process parameters such as microwave power, retention time and reactant concentrations on the physicochemical properties of HA.