In-wall heater

An in-wall heater which is disposed in a recess formed in room wall, comprising:

• an outer case;
• a combustion housing which is provided within the outer case and in which a burner is built;
• a heat exchanger which is provided within the outer case so as to be positioned behind the combustion housing and causes combustion exhaust gas from the combustion housing to flow;
• an air intake opening and a blast opening each provided in the outer case;
• a warm air fan within the outer case which sucks in room air from the air intake opening and sends the air into the room from the blast opening via a section where the heat exchanger is disposed;
• control equipment which is disposed in a side space on one lateral side between the outer case and the combustion housing within the case;
• and
• an exhaust duct downstream of the heat exchanger which is disposed in a side space on the other lateral side between the outer case and the combustion housing within the case,
• wherein in a side plate portion of the outer case on both lateral sides, the air intake opening is provided so as to be positioned in a front side portion exposed to the front of the room wall and vertically long, and each of the side spaces within the outer case is formed in a ventilation flue on the suction side where the room air from each of the air intake openings is conducted to the warm air fan.