HOT-WATER BOILER

摘要

PURPOSE:To enable to keep a temperature of hot water to be fed into from a feed hot water pipe at a fixed level, by a method wherein a heat source part is separated from a hot water tank, ducts having a circulating pump and a heat source part respectively are pulled out from the lower part of the hot water tank, a plurality of these ducts is collected at a single feed hot water pipe and connected with the inside of the hot water tank. CONSTITUTION:When a temperature of water in a hot water tank 3 is lower than a given temperature of a hot water, circulation pumps 4a and 4b are driven by application of a signal to the pumps through sensing the temperature by a temperature thermistor 9. When the circulating pumps 4a and 4b are driven, a heat source parts 5a and 5b are ignited through sensing by a flow switch (not illustrated herein) provided on the heat source parts 5a and 5b, and water is heated through circulation. In a process of this heating-up, quantities of flows of the circulating pumps 4a and 4b are made constant, burning quantities of the heat source parts 5a and 5b are controlled proportionally and a temperature of hot water to be fed into a feed hot water pipe is fixed. With this construction, when a temperature of hot water becomes more than a given level, temperature thermistors 16a and 16b are operated so that a signal is sent to a proportional valve (not illustrated herein) adjusting the burning quantities, the burning quantities are reduced (TDR burning) and the temperature of the hot water becomes the given level always.