FLUID-HEATING APPARATUS

摘要

A fluid-heating apparatus comprises a heat exchanger (3) for transferring heat from a primary fluid to a secondary fluid, a first supply (5) for supplying a primary fluid at a higher temperature to the heat exchanger and a second supply (7) for supplying the primary fluid at a lower temperature to the heat exchanger. A controller (11 ), in use, controls flow rate of the primary fluid from each supply to the heat exchanger, in response to a control signal.