A beverage making apparatus for an aircraft including one or more flow-through heating units (10; 460a, 460b, 460c; 530a, 530b, 530c; 630) for heating a fluid, each of the one or more flow-through heating units comprising: a first member (14; 414, 426, 438; 514a, 514b, 514c; 614), said first member (14; 414, 426, 438; 514a, 514b, 514c; 614) being generally annular; a second member (14; 414, 426, 438; 514a, 514b, 514c; 614), said second member (14; 414, 426, 438; 514a, 514b, 514c; 614) being generally annular; a third member mounted to the first member (14; 414, 426, 438; 514a, 514b, 514c; 614), the third member defining a helical flow path around the first member (14; 414, 426, 438; 514a, 514b, 514c; 614); a fourth member mounted to the second member (14; 414, 426, 438; 514a, 514b, 514c; 614), the fourth member (16 410, 422, 434, 510a, 510b, 510c, 616) defining a helical flow path around the second member (14; 414, 426, 438; 514a, 514b, 514c; 614); a first heating element (113, 412, 424, 436; 512a, 512b, 512c; 612) disposed along substantially the entire length of the third member , said first heating element (113, 412, 424, 436; 512a, 512b, 512c; 612) receiving at least one phase of a three phase power supply; a second heating element (113, 412, 424, 436; 512a, 512b, 512c; 612) disposed along substantially the entire length of the fourth member , said second heating element (113, 412, 424, 436; 512a, 512b, 512c; 612) receiving at least one phase of a three-phase power supply; and a plurality of valves (406; 506; 522a, 522b, 522c; 608) controlling a flow of a first fluid through the third member and the flow of a second fluid through the fourth member in response to a control signal wherein the first and second heating element (412, 424, 436, 512a, 512b, 512c; 612) are surrounded by the third and fourth member, respectively, configured as a coiled pipe , thus forming a first and second heating unit and the first and second annular member (414, 426, 438; 514a, 514b, 514c; 614) surround said correspondent heating unit (412, 424, 436, 512a, 512b, 512c; 612). a first member (14; 414, 426, 438; 514a, 514b, 514c; 614), said first member (14; 414, 426, 438; 514a, 514b, 514c; 614) being generally annular; a second member (14; 414, 426, 438; 514a, 514b, 514c; 614), said second member (14; 414, 426, 438; 514a, 514b, 514c; 614) being generally annular; a third member mounted to the first member (14; 414, 426, 438; 514a, 514b, 514c; 614), the third member defining a helical flow path around the first member (14; 414, 426, 438; 514a, 514b, 514c; 614); a fourth member mounted to the second member (14; 414, 426, 438; 514a, 514b, 514c; 614), the fourth member (16 410, 422, 434, 510a, 510b, 510c, 616) defining a helical flow path around the second member (14; 414, 426, 438; 514a, 514b, 514c; 614); a first heating element (113, 412, 424, 436; 512a, 512b, 512c; 612) disposed along substantially the entire length of the third member , said first heating element (113, 412, 424, 436; 512a, 512b, 512c; 612) receiving at least one phase of a three phase power supply; a second heating element (113, 412, 424, 436; 512a, 512b, 512c; 612) disposed along substantially the entire length of the fourth member , said second heating element (113, 412, 424, 436; 512a, 512b, 512c; 612) receiving at least one phase of a three-phase power supply; and a plurality of valves (406; 506; 522a, 522b, 522c; 608) controlling a flow of a first fluid through the third member and the flow of a second fluid through the fourth member in response to a control signal wherein the first and second heating element (412, 424, 436, 512a, 512b, 512c; 612) are surrounded by the third and fourth member, respectively, configured as a coiled pipe , thus forming a first and second heating unit and the first and second annular member (414, 426, 438; 514a, 514b, 514c; 614) surround said correspondent heating unit (412, 424, 436, 512a, 512b, 512c; 612). <EOS>