Patent ID: 8184964

Claim:
A tank for storing a reducing agent, in particular a liquid reducing agent, with which nitrogen oxides from exhaust gases of internal combustion engines are reduced to nitrogen and water, comprising: an external container having a bottom wall; an internal container received in the external container, the internal container having a bottom wall spaced from said external container bottom wall and connected with the external container in such a way that liquid reducing agent can flow out of the internal container into the external container; a heating element is received in the internal container; a removal device for removing the liquid reducing agent from the tank having a first removal line having a first end extending out of said tank and a second end disposed adjacent said bottom wall of said internal container, and a second removal line having a first end extending out of said tank and a second end extending through said bottom wall of said internal container and into said external container; and at least one opening embodied in the internal container through which the reducing agent can flow out of the external container into the internal container and vice versa, the at least one opening being disposed in the internal container in such a way that reducing agent covers the heating element when the internal container is filled with reducing agent up to the at least one opening.