Patent ID: 8042496

Claim:
A hot water supplying apparatus, comprising: a heat exchanger including an inlet pipe for introducing heating water into the heat exchanger, and first, second, and third heat exchanging pipes connected to the inlet pipe and sequentially arranged; and an auxiliary heat exchanging device installed at an inlet port of the heat exchanger through which the heating water is introduced, the auxiliary heat exchanging device including a first auxiliary heat exchanging pipe connecting the inlet pipe to the first heat exchanging pipe, a second auxiliary heat exchanging pipe connecting the second heat exchanging pipe to the third heat exchanging pipe, and heat transfer fins for transferring heat energy from the second auxiliary heat exchanging pipe to the first auxiliary heat exchanging pipe, wherein the first auxiliary heat exchanging pipe and the second auxiliary heat exchanging pipe and the heat transfer fins are enclosed inside the auxiliary heat exchanging device, and wherein the auxiliary heat exchanging device is insulated against heat transfer from a burner by a shielding wall.