The bronze altar1 that stood before the LORD he brought from the front of the temple--from between the new altar and the temple of the LORD--and put it on the north side of the new altar.
References for 2 Kings 16:14
King Ahaz then gave these orders to Uriah the priest: "On the large new altar, offer the morning2 burnt offering and the evening grain offering, the king's burnt offering and his grain offering, and the burnt offering of all the people of the land, and their grain offering and their drink offering. Sprinkle on the altar all the blood of the burnt offerings and sacrifices. But I will use the bronze altar for seeking guidance."3
References for 2 Kings 16:15
And Uriah the priest did just as King Ahaz had ordered.
King Ahaz took away the side panels and removed the basins from the movable stands. He removed the Sea from the bronze bulls that supported it and set it on a stone base.4
References for 2 Kings 16:17