Patent ID: 8893708

Claim:
A portable boiler for a heating mat comprising: a water reservoir storing circulating water that is received through an inlet tube disposed on one side of an upper portion of the water reservoir; a heat-transfer part allowing the circulating water to flow along a flow passage to exchange heat and discharging the circulating water to a heating mat through an outlet tube disposed on one side of the heat-transfer part; a heating part for heating the circulating water inside the heat-transfer part by burning fuel gas supplied from a fuel tank; a housing defining an exterior of the portable boiler; a heat-collecting plate on an undersurface of the heat-transfer part to increase thermal conductivity, wherein the water reservoir comprises: the inlet tube connected to one end of a circulation pipe buried in the heating mat on the one side of the upper portion of the water reservoir; a fixing bracket having a plurality of holes to allow the circulating water to flow into the heat-transfer part; a check valve formed of a thin film and opening or closing the plurality of holes according to a water pressure of the circulating water; and a temperature sensor sensing a temperature of the circulating water to generate a physical signal using expansion and contraction of a liquid filled therein; wherein the heat-transfer part has the flow passage that allows the circulating water to absorb heat when the check valve is opened and the circulating water flows therein; wherein the heating part comprises: a gas controller for controlling an injection amount of the fuel gas supplied from the fuel tank; a controller receiving the physical signal from the temperature sensor to control the gas controller; and an igniter comprising a combustor for burning the fuel gas supplied from the gas controller and a spark plug generating an electric spark on the combustor, wherein the flow passage of the heat-transfer part comprises: a vertical flow passage to which the circulating water first flows through the check valve of the water reservoir; a bypass flow passage detouring the circulating water from the vertical flow passage to one side; an inclination flow passage communicating with the bypass flow passage and inclining toward the outlet tube, wherein the portable boiler further comprises a shield plate disposed between the inclination flow passage and the bypass flow passage of the heat-transfer part to prevent heat transferred from the heat-collecting plate from being transferred to the water reservoir through the flow passage.