A warewash machine comprising: - a housing that at least in part defines a chamber with a wash zone, the chamber having front, left and right access openings; - at least one spray arm (23a, 23b) disposed above or below the wash zone, the spray arm (23a, 23b) comprising wash and rinse nozzles and being configured to spray liquid through the nozzles toward the wash zone; and - a multi-sided hood assembly including movable front, left, right and top wall sections, the multi-sided hood assembly movable between a lowered and closed position for washing and a raised and open position for inlet and outlet of wares; - a stationary chamber rear wall, the stationary chamber rear wall including an outlet opening, the outlet opening fluidly connected with a vapor extraction unit at a back side of the stationary chamber rear wall, the vapor extraction unit including an enclosure with a condenser therein, wherein incoming water to the machine from a cold water input passes through the condenser, wherein the enclosure includes an air outlet to surrounding ambient environment and at least one air mover selectively controllable for moving hot water vapor from the chamber, into the vapor extraction unit, over the condenser and out of the air outlet, characterized in that the multi-sided hood assembly also includes a movable rear wall section, wherein in the raised and open position each of the front, rear, left, right and top wall sections is raised to form a space to retain hot water vapor inside the multi-sided hood assembly, and wherein the outlet opening is located on a lower portion of the stationary chamber rear wall, and during operation of the at least one air mover, hot water vapor is drawn from a lower portion of the chamber, while make-up air enters the chamber by passing under the bottom of the front, left and/or right wall sections of the multi-sided hood assembly so that hot water vapor within an upper portion of the multi-sided hood assembly is substantially retained in the upper portion during operation of the vapor extraction unit. - a housing that at least in part defines a chamber with a wash zone, the chamber having front, left and right access openings; - at least one spray arm (23a, 23b) disposed above or below the wash zone, the spray arm (23a, 23b) comprising wash and rinse nozzles and being configured to spray liquid through the nozzles toward the wash zone; and - a multi-sided hood assembly including movable front, left, right and top wall sections, the multi-sided hood assembly movable between a lowered and closed position for washing and a raised and open position for inlet and outlet of wares; - a stationary chamber rear wall, the stationary chamber rear wall including an outlet opening, the outlet opening fluidly connected with a vapor extraction unit at a back side of the stationary chamber rear wall, the vapor extraction unit including an enclosure with a condenser therein, wherein incoming water to the machine from a cold water input passes through the condenser, wherein the enclosure includes an air outlet to surrounding ambient environment and at least one air mover selectively controllable for moving hot water vapor from the chamber, into the vapor extraction unit, over the condenser and out of the air outlet, characterized in that the multi-sided hood assembly also includes a movable rear wall section, wherein in the raised and open position each of the front, rear, left, right and top wall sections is raised to form a space to retain hot water vapor inside the multi-sided hood assembly, and wherein the outlet opening is located on a lower portion of the stationary chamber rear wall, and during operation of the at least one air mover, hot water vapor is drawn from a lower portion of the chamber, while make-up air enters the chamber by passing under the bottom of the front, left and/or right wall sections of the multi-sided hood assembly so that hot water vapor within an upper portion of the multi-sided hood assembly is substantially retained in the upper portion during operation of the vapor extraction unit. the multi-sided hood assembly also includes a movable rear wall section, wherein in the raised and open position each of the front, rear, left, right and top wall sections is raised to form a space to retain hot water vapor inside the multi-sided hood assembly, and wherein the outlet opening is located on a lower portion of the stationary chamber rear wall, and during operation of the at least one air mover, hot water vapor is drawn from a lower portion of the chamber, while make-up air enters the chamber by passing under the bottom of the front, left and/or right wall sections of the multi-sided hood assembly so that hot water vapor within an upper portion of the multi-sided hood assembly is substantially retained in the upper portion during operation of the vapor extraction unit.