Apparatus having a tank and a delivery unit for reducing agent

1. An apparatus, comprising:

at least one tank having a tank bottom;

a chamber disposed on said tank bottom, said chamber being fluidically sealed with respect to said tank for keeping said chamber free of a liquid when the tank contains liquid therein, said chamber having at least one heater disposed therein; and

a delivery unit for the liquid, the liquid being aqueous urea, said delivery unit disposed in said chamber.

2. The apparatus according to claim 1 , wherein insulation is provided at least in vicinity of said top of said chamber.

3. The apparatus according to claim 1 , wherein said at least one heater includes at least one self-regulating heating segment.

4. The apparatus according to claim 1 , wherein said at least one heater is constructed as a filling level gauge.

5. The apparatus according to claim 1 , which further comprises at least one heat-conducting device disposed on said tank bottom in vicinity of said chamber.

6. The apparatus according to claim 5 , wherein said heat-conducting device serves to fasten said chamber.

7. The apparatus according to claim 1 , which further comprises:

a discharge line for liquid leading from said tank into said chamber; and

a return line for liquid leading from said chamber into said tank;

said discharge line and said return line disposed at different positions in said chamber.

8. The apparatus according to claim 7 , wherein at least said discharge line or said return line has a drain block.

9. The apparatus according to claim 7 , wherein said discharge line is placed at said tank bottom and the return line is placed at said top of said chamber.

10. The apparatus according to claim 1 , wherein said at least one heater includes a plurality of heating segments which are self regulating independently from one another.

11. The apparatus according to claim 1 , wherein said chamber has a chamber side wall and a chamber top, and said at least one heater has at least one electrical heating segment disposed in heat-conducting contact at least with said chamber side wall or said chamber top.

12. The apparatus according to claim 11 , wherein said chamber has a height, and said at least one heater has a plurality of heating segments provided in direction of said height of said chamber.

13. The apparatus according to claim 1 , wherein said at least one heater is at least one electrical heater.

14. The apparatus according to claim 13 , wherein said at least one electrical heater is a heating foil.

15. The apparatus according to claim 1 , wherein said chamber has a chamber side wall and said at least one heater is disposed on said side wall in heat-conducting contact at least with said chamber side wall.

16. The apparatus according to claim 1 , wherein said chamber projects into said tank.

17. The apparatus according to claim 16 , wherein said chamber has chamber side walls extending perpendicular to said tank bottom.