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Water enters at the inlet (A), flows past the diffuser (B) and is discharged at the outlet (C). Steam enters at the inlet (D) and travels down through the diffuser (B) where it is injected into the water. Steam is injected into the water through the small holes within the diffuser (B). To control the amount of steam injected or heating required, an actuator moves the stem plug to expose the necessary amount of holes on the diffuser . Each hole exposed discharges steam at a very high, often sonic velocity. The turbulent nature of this high velocity discharge enables steam to instantaneously penetrate, disperse and efficiently produce uniform heating. This process utilized our patented MACH^® Diffuser Technology. The temperature of the outlet water is measured downstream and the steam flow is regulated accordingly to achieve the targeted results.