Abstract: The present invention relates to a consumption meter for measuring consumption data of either a hot or a cold liquid supplied to a consumer site (2). The consumption meter comprises a flow meter unit (5) arranged for mount at either an inlet side (3) or an outlet side (4) of the consumer site, and arranged for measuring a flow quantity of the supplied liquid; an inlet temperature sensor (6) for measuring an inlet temperature of the supplied liquid medium, and an outlet temperature sensor (7) for measuring an outlet temperature of the supplied liquid medium; a calculator unit (8) configured to determine consumption values based on the flow quantity, the inlet temperature and the outlet temperature. The consumption meter comprises at least two legally verified consumption registers (R1, R2) for storing consumption values verified for billing.