PROBLEM TO BE SOLVED: To provide an agricultural greenhouse heater utilizing the fermentation heat of an organic substance, capable of achieving sufficient heating capability even in a relatively small-scale device by efficiently utilizing the fermentation heat generated inside a tank.SOLUTION: The agricultural greenhouse heater is for heating the interior of an agricultural greenhouse (9) by means of heat exchange by feeding a heating medium heated with the fermentation heat of a substance to be fermented to the agricultural greenhouse. The agricultural greenhouse heater includes a fermentation tank (1) for fermenting the substance to be fermented, and a heating medium circulating device (2) for circulating the heating medium. The heating medium circulating device (2) includes: heat-exchange piping (20) disposed within the fermentation tank (1) for the heat exchange via the heating medium inside the object to be fermented； circulation piping (25) for feeding the heating medium heat-exchanged in the fermentation tank (1) into the agricultural greenhouse (9) for heat exchange and circulating the heating medium between the agricultural greenhouse (9) and the fermentation tank (1)； and a blower (26) for making the heating medium flow in the heat-exchange piping (20) and the circulation piping (25).【課題】有機物の発酵熱を利用した農業用ハウス暖房装置において、槽内で発生する発酵熱をより効率よく利用できるようにして、比較的小規模の装置でも十分な暖房能力が得られる農業用ハウス暖房装置を提供する。【解決手段】農業用ハウス暖房装置は、農業用ハウスに被発酵物の発酵熱で加温された熱媒体を供給し、熱交換によって農業用ハウス(9)内の暖房を行うものであって、被発酵物を発酵させる発酵槽(1)と、熱媒体を循環させる熱媒体循環装置(2)とを備えている。熱媒体循環装置(2)は、発酵槽(1)内に配管され、被発酵物の内部で熱媒体を介した熱交換を行う熱交換用配管(20)と、発酵槽(1)で熱交換を行った熱媒体を農業用ハウス(9)内に供給して熱交換を行い、農業用ハウス(9)内と発酵槽(1)との間で循環させる循環用配管(25)と、熱交換用配管(20)と循環用配管(25)内部で熱媒体を流動させる送風機(26)を備えている。【選択図】図１
