A residential tank is a liquid tank(for potable water, non-drinking water, fuel) closed to the house, normally placed in basement, garden, etc.
For Water
In municipal area, the water supply is good, the home water tank can be an auxiliary water storage tank for garden, firefighting, and emergency water supply.
In remote area, the water source is far away, the house water can provide a stable water supply, for drinking, cooking, shower, irrigation, firefighting and anywhere the water needed.
For Fuel
The home fuel tank uses as an auxiliary fuel storage tank in house.