MULTIFUNKTIONELLES HEIZUNGSGERÄT

A heating device (14) for heating a space (31) comprises: a burner (19); a first heat exchanger (1) with a first passage (15) and a second passage (16), which first passage (15) is connectable to a feed (20) for outside air for supplying fresh outside air to the burner (19), and which second passage (16) is connectable to a feed (21) for return air from said space (31) for discharging the return air to a discharge (22) to the outside; a second heat exchanger (2) with a first passage (17) and a second passage (18); which first passage (17) connects with its inlet to the outlet of the first passage (15) of the first heat exchanger (1) and connects with its outlet to a discharge (23) for heated air to said space (31); the outlet of which first passage (15) also connects to the burner (19) for supplying combustion air thereto; the discharge (24) of which burner (19) connects to the inlet of the second passage (18); the outlets of which second passages (16,18) jointly connect onto the discharge (22); fan means (11,12) for maintaining at least the air flow through the burner (19); and is characterized by a bypass (24) connected between the feed (20) and the discharge (23) for direct through-feed of a flow of outside air to the discharge (23), in which bypass (24) is accommodated a valve (4) adjustable by central control means (33); a valve (5) placed between the outlet of the first passage (15) and the inlet of the first passage (17) which is adjustable by the central control means (3).