PURPOSE: To prevent the deterioration of evaporating capacity at a low temperature and reduce the operating cost as well as the installation cost of the title hot-water supplier by employing a small-capacity heater by forming a suction passage between a burner chamber as well as a combustion chamber and an outer casing.

CONSTITUTION: Different from a conventional natural exhaust type embodyment, the title kerosene burning hot-water supplier is provided with a suction duct 21, surrounding a space between the back wall surfaces of fins 10, a burner chamber 8, a combustion chamber 9 and an exhaust passage 14 and the inner wall surface of an outer casing 16 by partitioning plates 20, together with a suction passage 22, connecting an air feeding port 13 to the suction port 6a of a fan 6. The temperature of the sucking atmosphere of the fan 6 is increased by receiving heat from the outer walls of the exhaust passage 14, the combustion chamber 9 and the burner chamber 8 while it passes through the air feeding port 13, the suction passage 22 and the suction duct 21 whereby the evaporating capacity of an evaporator 4 will never be deteriorated even when an atmospheric temperature is low.