Abstract: The present invention relates to a method for detecting a blockage in an exhaust flue of a gas boiler, comprising: (A) a step for conducting an ignition process according to a user set temperature requested from the outside and performing temperature control to reach the user set temperature; (B) a step for determining whether the current fan RPM of a driven blower exceeds a reference fan RPM; (C) a step for calculating a difference between temperature values of supplied heating water and collected heating water that are detected by temperature sensors when heating water is supplied and determining whether the calculated value is less than a preset reference temperature value when it is determined that the current fan RPM exceeds the reference fan RPM; (D) a step for determining whether the elapsed time elapses a preset setting time based on the determination time point of the step (C) when it is determined that the calculated value is less than the reference temperature value; and (E) a step for displaying,

Abstract: The present invention relates to a method for detecting a blockage in an exhaust flue of a gas boiler, comprising: (A) a step for conducting an ignition process according to a user set temperature requested from the outside and performing temperature control to reach the user set temperature; (B) a step for determining whether the current fan RPM of a driven blower exceeds a reference fan RPM; (C) a step for calculating a difference between temperature values of supplied heating water and collected heating water that are detected by temperature sensors when heating water is supplied and determining whether the calculated value is less than a preset reference temperature value when it is determined that the current fan RPM exceeds the reference fan RPM; (D) a step for determining whether the elapsed time elapses a preset setting time based on the determination time point of the step (C) when it is determined that the calculated value is less than the reference temperature value; and (E) a step for displaying,

Abstract: The present invention relates to a structure for controlling a temperature of hot-water supply from a waste heat recovery system, and more particularly, to a structure for controlling a temperature of hot-water supply from a waste heat recovery system using a three-way valve capable of stably supplying hot water at a hot-water supply setting temperature during hot-water supply use using the three-way valve and saving energy to improve system efficiency, in a waste heat recovery system recycling waste heat.