I got this stove from Davis tent. I am very happy with it. I do have the hot water tank on the side but have not used it yet. Just make sure that you burn it off very well before you run it in the tent.
The stove we use was made by one of our guys and it doesn't have a water tank but other than that it looks pretty much like this.
And our stove is a 16x20 and it does just fine for us.
Dober