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I thought of a problem with a cracked head etc. but I do not think it will be able to "burn" that amount of water without any indication. But: I think it is a temperature related issue.
Really strange, thermostat and water pump can be ruled out? Otherwise that would be my next approach (it is a 2000 Boxster) and use UV coolant dye as mentioned. Even if it cannot be tracked back to the pump/thermostat it is worth doing it anyway.
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