Regarding the liquid discharge from the bottom of the distillation tower

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I am working on the design of a system and have encountered the following issue: the liquid taken out from the tower bottom has a flow rate of 2000 kg/h; it contains 40% ethanol and 60% water, and is a saturated liquid. The distillation tower operates under negative pressure, with an operating pressure of -0.5 barg. It is equipped with a horizontal-type reboiler that is connected to the distillation tower via pipes. The NPSH of the Tata kettle pump is 3.5 m. How can the installation height of a horizontal-tank reboiler be calculated to ensure that the liquid in the reactor tank can be successfully pumped out by the reactor tank pump without cavitation occurring? If we use the calculation methods outlined in the chemical engineering design manuals, the installation height of the reactor bottom should be at least 8–10 meters; this seems a bit unacceptable to me. Is my calculation correct? Are there any suggestions that could help reduce the installation height of the batch reboiler?