The price of the tank does not give, to open the safety valve placed in the cold water inlet, I want to know if I take it out so that the water can enter without hindrance, what would happen? .

Excuse me the question is why Monte turns on the water heater because you don't have water pressure? If so, you should see how high the water tank is. There you are not tall enough. The safety valve does not think it obstructs the flow.