| 摘要 |
PURPOSE:To enable to obtain an instantaneous water heater having comparatively simple structure and high thermal efficiency, by so constituting that exhaust gas is circulated forcibly to at leat one heat exchanger chamber by a fan, in the titled instantaneous water heater provided with the two or more heat exchanging chamber. CONSTITUTION:Exhaust gas of a burner 2 passed through a communicating hole 8 for the exhaust gas from a main heat exchanging chamber 3 flows in a hollow part 18a of a guide cylinder 18 provided by bringing into contact with a heat absorbing fin 19 of a primary sub heat exchanger 14 in a primary sub heat exchanger chamber 4. The exhaust which carried out fixed heat exchange work in the hollow part 18a is blown off into the primary sub heat exchanging chamber 4 forming an external space of the guide cylinder 18 from a circulation outlet 20a through suction action of a fan 17 provided outside the guide cylinder 18. A part of the blown off exhaust gas flows into a secondary sub heat exchanger chamber 5 from a communicating hole 9 of the exhaust gas, which is discharged out of a main body 1 through a discharge outlet 23 opened on its wall of a ceiling after fixed heat exchange work carried out in the secondary sub heat exchanger 15 provided in the chamber 5. |
