HOT AIR HEATER FOR PROTECTED HORTICULTURE

PROBLEM TO BE SOLVED: To provide a hot air heater for protected horticulture, preventing leakage of fuel oil from each seal part by rise of an in-pipe pressure of a fuel pipeline such as under the burning sun by practically using an adjunctive service tank without additionally increasing equipment.SOLUTION: In this hot air heater for protected horticulture, one end face of a casing 101 is provided with a burner 110, the fuel pipeline 140 is provided between an oil pump 120 supplying fuel to the burner 110 and an oil tank 200 installed outside a house for the protected horticulture, and the service tank 150 temporarily storing the fuel is provided halfway along the fuel pipeline 140. The fuel pipeline 140 between the oil pump 120 and the service tank 150 includes: a going path pipe 144 through which the fuel is discharged from a fuel storage part 152 of the service tank 150; and a return path pipe 145 through which the fuel returns from the oil pump 120. A pressure buffer part 153 buffering the in-pipe pressure of the fuel pipeline 140 is provided in an upper space except the fuel storage part 152 inside the service tank 150.