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(11) | EP 0 992 743 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Gas boiler with means for accumulating and maintaining hot water for domestic use |
| (57) A boiler for producing hot water for heating and for domestic use, of the type comprising
a first hydraulic circuit (1) for heating the water destined for a heating system,
said first circuit comprising means (2) for the forced circulation of the water through
said first circuit, first means (3, 16) for generating heat and transferring it to
the water, valve means (4) for conveying the heated water to a delivery pipe (7) or
to second heat exchanger means (25) arranged to transfer at least part of the heat
of the heated water to the water for domestic use circulating through a second hydraulic
circuit (5), expansion means (17) for automatically adjusting the pressure of the
water circulating through the primary circuit as its temperature varies, and means
for accumulating and maintaining a predetermined quantity of heated water in the primary
circuit within a predetermined temperature range, said accumulating and maintaining
means being connected to the primary circuit in such a manner as to make available
to the second heat exchanger means (25) said predetermined quantity of heated water
at least during an initial stage in the heating of the water for domestic use circulating
through the second circuit; wherein the expansion means (17) comprise means (20, 21,
23) for integrating into the expansion means said means for accumulating and maintaining
the heated water. |