FLOOR HEATING HEAT EXCHANGER BUILT-IN TYPE HEATER

PROBLEM TO BE SOLVED: To provide a compact floor heating heat exchanger built-in type heater.SOLUTION: The floor heating heat exchanger built-in type heater includes: a heat release part 3 making combustion gas generated by combustion of a burner part 1 flow to release heat; and a partition plate 6 arranged within the heat release part 3 and partitioning a front face side serving as a heat release face and a back face side having an inlet and outlet of the combustion gas. In the partition plate 6, a ventilation means 8 is provided in a position opposing to the inlet 4 of the combustion gas, and an exhaust passage 11 and a hot air heating heat exchanger 19 continued to the exhaust passage 11 are provided in rear of the outlet 5. A bypass passage 12 including the floor heating heat exchanger 13 is provided in parallel with the exhaust passage 11. A switching damper 14 is provided between the exhaust passage 11 and the bypass passage 12. By switching the bypass passage 12 and the exhaust passage 11 by the switching damper 14, hot air heating also used for floor heating and hot air heating which does not use floor heating are switched.