Heated to is provided with a main body 212 to surround the target space (212a) which are accused sacred place, the conditioned space. Heated to is heated by the combustion in the exhaust gas or the combustion chamber flowing through the fuel gas main inlet hole, the lead-out portions caused the exhaust gas is induced by the introduced combustion chamber, the combustion in which the fuel gas is burned to flow into, parts derived accused Dangerous if the radiation to heat transfer to radiation heat, and having an exhaust hole for the exhaust of the exhaust gas out of the unit heating the radiation surface, through the exhaust ball and open in the one or a plurality of hermetically sealed gas heater, and a closed gas heater arranged in the body and a heat exhaust unit which exhaust gas is induced (insulating tube (222a)). It may also be installed on the area except for the copy which is formed between the heat radiation of the accused sacred and the accused in the sacred place in not the main body to exhaust the heat transfer unit comprises a closed gas space heater and a target area (212b).