Abstract: A pulse combustion system in which a single air intake assembly is associated with a plurality of pulse combustion gaseous fuel heater assemblies. The air intake assembly includes a blower arranged to supply combustion air to the heater assemblies, and the heater assemblies each includes a pulse combustion burner arranged to be supplied with gaseous fuel from a source of gaseous fuel and the combustion air from the blower. A tailpipe is connected to the combustion chamber of the burner and arranged therewith within a water tub or an oil vessel. An electric control appartus for the system selectively activates the heater assemblies, energizes a motor of the blower for a predetermined period of time prior to selective activation of the heater assemblies and energizes the motor of the blower for a second predetermined period of time after one of the heater assemblies has been deactivated during activation of the other heater assemblies.