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(11) | EP 0 981 031 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Heating water flow circulation and instantaneous hot sanitary water supply apparatus in a combi-boiler |
| (57) Disclosed is a heating water flow circulation and hot sanitary water supply apparatus
in a combi-boiler which preheats cold water during heating and instantaneously supplies
hot water when turning a tap on for use in the kitchen and bath room, etc. The apparatus
comprises a water-to-water heat exchanger, in which sanitary water layers and heating
flow layers are alternately multilayer-formed to perform heat exchange between heating
flow and sanitary water, and a heating flow diverting unit controls the five direction
of the heating flow circulation according to a heating mode or a hot sanitary water
supply mode. Also, the apparatus rapidly supplies the hot sanitary water by circulating
part of the heating flow to the heating flow layers of the water-to-water heat exchanger
during the supplied heating flow is circulated for heating. Accordingly, the heating
water flow circulation and instantaneous hot water supply apparatus of the present
invention can shorten a outflow time of cold water when using hot sanitary water and
simplify many components in a boiler including a heating flow bypass valve, which
is integrated in a single module. |