Patent ID: 7995905

Claim:
A method of producing steam in a heating unit for use in cooking, the method comprising: receiving, via a spray device, a liquid including impurities at a predetermined flow rate within an entry port of a monotube in the heating unit, said monotube having a lumen of a predetermined size, said monotube formed as coiled monotube having a plurality of turns; converting, via application of heat produced by at least one heating device of the heating unit, said received liquid into a two phase flow of liquid and gas, said flow comprising both turbulent and laminar flow; and passing at least said turbulent flow through said lumen at a velocity sufficient to carry said impurities through an exit port of said monotube in fluid communication with said lumen and producing the steam at said exit port, wherein said velocity is responsive to at least said predetermined flow rate and predetermined size of said lumen; and delivering the steam to a cooking chamber of a cooking device to cook or re-therm food products therein, the cooking device including a control unit coupled to the spray device and the heating device to control steam production.